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@@ -553,3 +553,4 @@ parrot/lib/python3.10/site-packages/nvidia/cuda_cupti/lib/libcupti.so.12 filter=
 moondream/lib/python3.10/site-packages/altair/vegalite/v5/__pycache__/api.cpython-310.pyc filter=lfs diff=lfs merge=lfs -text
 mantis_evalkit/bin/python3.10 filter=lfs diff=lfs merge=lfs -text
 openflamingo/lib/python3.10/site-packages/torch/lib/libnvrtc-672ee683.so.11.2 filter=lfs diff=lfs merge=lfs -text
+mantis_evalkit/lib/python3.10/site-packages/numpy/lib/tests/__pycache__/test_function_base.cpython-310.pyc filter=lfs diff=lfs merge=lfs -text

mantis_evalkit/lib/python3.10/site-packages/numpy/_core/tests/_natype.py

@@ -0,0 +1,198 @@
+# Vendored implementation of pandas.NA, adapted from pandas/_libs/missing.pyx
+#
+# This is vendored to avoid adding pandas as a test dependency.
+
+__all__ = ["pd_NA"]
+
+import numbers
+
+import numpy as np
+
+def _create_binary_propagating_op(name, is_divmod=False):
+    is_cmp = name.strip("_") in ["eq", "ne", "le", "lt", "ge", "gt"]
+
+    def method(self, other):
+        if (
+            other is pd_NA
+            or isinstance(other, (str, bytes))
+            or isinstance(other, (numbers.Number, np.bool))
+            or isinstance(other, np.ndarray)
+            and not other.shape
+        ):
+            # Need the other.shape clause to handle NumPy scalars,
+            # since we do a setitem on `out` below, which
+            # won't work for NumPy scalars.
+            if is_divmod:
+                return pd_NA, pd_NA
+            else:
+                return pd_NA
+
+        elif isinstance(other, np.ndarray):
+            out = np.empty(other.shape, dtype=object)
+            out[:] = pd_NA
+
+            if is_divmod:
+                return out, out.copy()
+            else:
+                return out
+
+        elif is_cmp and isinstance(other, (np.datetime64, np.timedelta64)):
+            return pd_NA
+
+        elif isinstance(other, np.datetime64):
+            if name in ["__sub__", "__rsub__"]:
+                return pd_NA
+
+        elif isinstance(other, np.timedelta64):
+            if name in ["__sub__", "__rsub__", "__add__", "__radd__"]:
+                return pd_NA
+
+        return NotImplemented
+
+    method.__name__ = name
+    return method
+
+
+def _create_unary_propagating_op(name: str):
+    def method(self):
+        return pd_NA
+
+    method.__name__ = name
+    return method
+
+
+class NAType:
+    def __repr__(self) -> str:
+        return "<NA>"
+
+    def __format__(self, format_spec) -> str:
+        try:
+            return self.__repr__().__format__(format_spec)
+        except ValueError:
+            return self.__repr__()
+
+    def __bool__(self):
+        raise TypeError("boolean value of NA is ambiguous")
+
+    def __hash__(self):
+        exponent = 31 if is_32bit else 61
+        return 2**exponent - 1
+
+    def __reduce__(self):
+        return "pd_NA"
+
+    # Binary arithmetic and comparison ops -> propagate
+
+    __add__ = _create_binary_propagating_op("__add__")
+    __radd__ = _create_binary_propagating_op("__radd__")
+    __sub__ = _create_binary_propagating_op("__sub__")
+    __rsub__ = _create_binary_propagating_op("__rsub__")
+    __mul__ = _create_binary_propagating_op("__mul__")
+    __rmul__ = _create_binary_propagating_op("__rmul__")
+    __matmul__ = _create_binary_propagating_op("__matmul__")
+    __rmatmul__ = _create_binary_propagating_op("__rmatmul__")
+    __truediv__ = _create_binary_propagating_op("__truediv__")
+    __rtruediv__ = _create_binary_propagating_op("__rtruediv__")
+    __floordiv__ = _create_binary_propagating_op("__floordiv__")
+    __rfloordiv__ = _create_binary_propagating_op("__rfloordiv__")
+    __mod__ = _create_binary_propagating_op("__mod__")
+    __rmod__ = _create_binary_propagating_op("__rmod__")
+    __divmod__ = _create_binary_propagating_op("__divmod__", is_divmod=True)
+    __rdivmod__ = _create_binary_propagating_op("__rdivmod__", is_divmod=True)
+    # __lshift__ and __rshift__ are not implemented
+
+    __eq__ = _create_binary_propagating_op("__eq__")
+    __ne__ = _create_binary_propagating_op("__ne__")
+    __le__ = _create_binary_propagating_op("__le__")
+    __lt__ = _create_binary_propagating_op("__lt__")
+    __gt__ = _create_binary_propagating_op("__gt__")
+    __ge__ = _create_binary_propagating_op("__ge__")
+
+    # Unary ops
+
+    __neg__ = _create_unary_propagating_op("__neg__")
+    __pos__ = _create_unary_propagating_op("__pos__")
+    __abs__ = _create_unary_propagating_op("__abs__")
+    __invert__ = _create_unary_propagating_op("__invert__")
+
+    # pow has special
+    def __pow__(self, other):
+        if other is pd_NA:
+            return pd_NA
+        elif isinstance(other, (numbers.Number, np.bool)):
+            if other == 0:
+                # returning positive is correct for +/- 0.
+                return type(other)(1)
+            else:
+                return pd_NA
+        elif util.is_array(other):
+            return np.where(other == 0, other.dtype.type(1), pd_NA)
+
+        return NotImplemented
+
+    def __rpow__(self, other):
+        if other is pd_NA:
+            return pd_NA
+        elif isinstance(other, (numbers.Number, np.bool)):
+            if other == 1:
+                return other
+            else:
+                return pd_NA
+        elif util.is_array(other):
+            return np.where(other == 1, other, pd_NA)
+        return NotImplemented
+
+    # Logical ops using Kleene logic
+
+    def __and__(self, other):
+        if other is False:
+            return False
+        elif other is True or other is pd_NA:
+            return pd_NA
+        return NotImplemented
+
+    __rand__ = __and__
+
+    def __or__(self, other):
+        if other is True:
+            return True
+        elif other is False or other is pd_NA:
+            return pd_NA
+        return NotImplemented
+
+    __ror__ = __or__
+
+    def __xor__(self, other):
+        if other is False or other is True or other is pd_NA:
+            return pd_NA
+        return NotImplemented
+
+    __rxor__ = __xor__
+
+    __array_priority__ = 1000
+    _HANDLED_TYPES = (np.ndarray, numbers.Number, str, np.bool)
+
+    def __array_ufunc__(self, ufunc, method, *inputs, **kwargs):
+        types = self._HANDLED_TYPES + (NAType,)
+        for x in inputs:
+            if not isinstance(x, types):
+                return NotImplemented
+
+        if method != "__call__":
+            raise ValueError(f"ufunc method '{method}' not supported for NA")
+        result = maybe_dispatch_ufunc_to_dunder_op(
+            self, ufunc, method, *inputs, **kwargs
+        )
+        if result is NotImplemented:
+            # For a NumPy ufunc that's not a binop, like np.logaddexp
+            index = [i for i, x in enumerate(inputs) if x is pd_NA][0]
+            result = np.broadcast_arrays(*inputs)[index]
+            if result.ndim == 0:
+                result = result.item()
+            if ufunc.nout > 1:
+                result = (pd_NA,) * ufunc.nout
+
+        return result
+
+
+pd_NA = NAType()

mantis_evalkit/lib/python3.10/site-packages/numpy/_core/tests/examples/cython/checks.pyx

@@ -0,0 +1,274 @@
+#cython: language_level=3
+
+"""
+Functions in this module give python-space wrappers for cython functions
+exposed in numpy/__init__.pxd, so they can be tested in test_cython.py
+"""
+cimport numpy as cnp
+cnp.import_array()
+
+
+def is_td64(obj):
+    return cnp.is_timedelta64_object(obj)
+
+
+def is_dt64(obj):
+    return cnp.is_datetime64_object(obj)
+
+
+def get_dt64_value(obj):
+    return cnp.get_datetime64_value(obj)
+
+
+def get_td64_value(obj):
+    return cnp.get_timedelta64_value(obj)
+
+
+def get_dt64_unit(obj):
+    return cnp.get_datetime64_unit(obj)
+
+
+def is_integer(obj):
+    return isinstance(obj, (cnp.integer, int))
+
+
+def get_datetime_iso_8601_strlen():
+    return cnp.get_datetime_iso_8601_strlen(0, cnp.NPY_FR_ns)
+
+
+def convert_datetime64_to_datetimestruct():
+    cdef:
+        cnp.npy_datetimestruct dts
+        cnp.PyArray_DatetimeMetaData meta
+        cnp.int64_t value = 1647374515260292
+        # i.e. (time.time() * 10**6) at 2022-03-15 20:01:55.260292 UTC
+
+    meta.base = cnp.NPY_FR_us
+    meta.num = 1
+    cnp.convert_datetime64_to_datetimestruct(&meta, value, &dts)
+    return dts
+
+
+def make_iso_8601_datetime(dt: "datetime"):
+    cdef:
+        cnp.npy_datetimestruct dts
+        char result[36]  # 36 corresponds to NPY_FR_s passed below
+        int local = 0
+        int utc = 0
+        int tzoffset = 0
+
+    dts.year = dt.year
+    dts.month = dt.month
+    dts.day = dt.day
+    dts.hour = dt.hour
+    dts.min = dt.minute
+    dts.sec = dt.second
+    dts.us = dt.microsecond
+    dts.ps = dts.as = 0
+
+    cnp.make_iso_8601_datetime(
+        &dts,
+        result,
+        sizeof(result),
+        local,
+        utc,
+        cnp.NPY_FR_s,
+        tzoffset,
+        cnp.NPY_NO_CASTING,
+    )
+    return result
+
+
+cdef cnp.broadcast multiiter_from_broadcast_obj(object bcast):
+    cdef dict iter_map = {
+        1: cnp.PyArray_MultiIterNew1,
+        2: cnp.PyArray_MultiIterNew2,
+        3: cnp.PyArray_MultiIterNew3,
+        4: cnp.PyArray_MultiIterNew4,
+        5: cnp.PyArray_MultiIterNew5,
+    }
+    arrays = [x.base for x in bcast.iters]
+    cdef cnp.broadcast result = iter_map[len(arrays)](*arrays)
+    return result
+
+
+def get_multiiter_size(bcast: "broadcast"):
+    cdef cnp.broadcast multi = multiiter_from_broadcast_obj(bcast)
+    return multi.size
+
+
+def get_multiiter_number_of_dims(bcast: "broadcast"):
+    cdef cnp.broadcast multi = multiiter_from_broadcast_obj(bcast)
+    return multi.nd
+
+
+def get_multiiter_current_index(bcast: "broadcast"):
+    cdef cnp.broadcast multi = multiiter_from_broadcast_obj(bcast)
+    return multi.index
+
+
+def get_multiiter_num_of_iterators(bcast: "broadcast"):
+    cdef cnp.broadcast multi = multiiter_from_broadcast_obj(bcast)
+    return multi.numiter
+
+
+def get_multiiter_shape(bcast: "broadcast"):
+    cdef cnp.broadcast multi = multiiter_from_broadcast_obj(bcast)
+    return tuple([multi.dimensions[i] for i in range(bcast.nd)])
+
+
+def get_multiiter_iters(bcast: "broadcast"):
+    cdef cnp.broadcast multi = multiiter_from_broadcast_obj(bcast)
+    return tuple([<cnp.flatiter>multi.iters[i] for i in range(bcast.numiter)])
+
+
+def get_default_integer():
+    if cnp.NPY_DEFAULT_INT == cnp.NPY_LONG:
+        return cnp.dtype("long")
+    if cnp.NPY_DEFAULT_INT == cnp.NPY_INTP:
+        return cnp.dtype("intp")
+    return None
+
+def get_ravel_axis():
+    return cnp.NPY_RAVEL_AXIS
+
+
+def conv_intp(cnp.intp_t val):
+    return val
+
+
+def get_dtype_flags(cnp.dtype dtype):
+    return dtype.flags
+
+
+cdef cnp.NpyIter* npyiter_from_nditer_obj(object it):
+    """A function to create a NpyIter struct from a nditer object.
+
+    This function is only meant for testing purposes and only extracts the
+    necessary info from nditer to test the functionality of NpyIter methods
+    """
+    cdef:
+        cnp.NpyIter* cit
+        cnp.PyArray_Descr* op_dtypes[3]
+        cnp.npy_uint32 op_flags[3]
+        cnp.PyArrayObject* ops[3]
+        cnp.npy_uint32 flags = 0
+
+    if it.has_index:
+        flags |= cnp.NPY_ITER_C_INDEX
+    if it.has_delayed_bufalloc:
+        flags |= cnp.NPY_ITER_BUFFERED | cnp.NPY_ITER_DELAY_BUFALLOC
+    if it.has_multi_index:
+        flags |= cnp.NPY_ITER_MULTI_INDEX
+
+    # one of READWRITE, READONLY and WRTIEONLY at the minimum must be specified for op_flags
+    for i in range(it.nop):
+        op_flags[i] = cnp.NPY_ITER_READONLY
+
+    for i in range(it.nop):
+        op_dtypes[i] = cnp.PyArray_DESCR(it.operands[i])
+        ops[i] = <cnp.PyArrayObject*>it.operands[i]
+
+    cit = cnp.NpyIter_MultiNew(it.nop, &ops[0], flags, cnp.NPY_KEEPORDER,
+                               cnp.NPY_NO_CASTING, &op_flags[0],
+                               <cnp.PyArray_Descr**>NULL)
+    return cit
+
+
+def get_npyiter_size(it: "nditer"):
+    cdef cnp.NpyIter* cit = npyiter_from_nditer_obj(it)
+    result = cnp.NpyIter_GetIterSize(cit)
+    cnp.NpyIter_Deallocate(cit)
+    return result
+
+
+def get_npyiter_ndim(it: "nditer"):
+    cdef cnp.NpyIter* cit = npyiter_from_nditer_obj(it)
+    result = cnp.NpyIter_GetNDim(cit)
+    cnp.NpyIter_Deallocate(cit)
+    return result
+
+
+def get_npyiter_nop(it: "nditer"):
+    cdef cnp.NpyIter* cit = npyiter_from_nditer_obj(it)
+    result = cnp.NpyIter_GetNOp(cit)
+    cnp.NpyIter_Deallocate(cit)
+    return result
+
+
+def get_npyiter_operands(it: "nditer"):
+    cdef cnp.NpyIter* cit = npyiter_from_nditer_obj(it)
+    try:
+        arr = cnp.NpyIter_GetOperandArray(cit)
+        return tuple([<cnp.ndarray>arr[i] for i in range(it.nop)])
+    finally:
+        cnp.NpyIter_Deallocate(cit)
+
+
+def get_npyiter_itviews(it: "nditer"):
+    cdef cnp.NpyIter* cit = npyiter_from_nditer_obj(it)
+    result = tuple([cnp.NpyIter_GetIterView(cit, i) for i in range(it.nop)])
+    cnp.NpyIter_Deallocate(cit)
+    return result
+
+
+def get_npyiter_dtypes(it: "nditer"):
+    cdef cnp.NpyIter* cit = npyiter_from_nditer_obj(it)
+    try:
+        arr = cnp.NpyIter_GetDescrArray(cit)
+        return tuple([<cnp.dtype>arr[i] for i in range(it.nop)])
+    finally:
+        cnp.NpyIter_Deallocate(cit)
+
+
+def npyiter_has_delayed_bufalloc(it: "nditer"):
+    cdef cnp.NpyIter* cit = npyiter_from_nditer_obj(it)
+    result = cnp.NpyIter_HasDelayedBufAlloc(cit)
+    cnp.NpyIter_Deallocate(cit)
+    return result
+
+
+def npyiter_has_index(it: "nditer"):
+    cdef cnp.NpyIter* cit = npyiter_from_nditer_obj(it)
+    result = cnp.NpyIter_HasIndex(cit)
+    cnp.NpyIter_Deallocate(cit)
+    return result
+
+
+def npyiter_has_multi_index(it: "nditer"):
+    cdef cnp.NpyIter* cit = npyiter_from_nditer_obj(it)
+    result = cnp.NpyIter_HasMultiIndex(cit)
+    cnp.NpyIter_Deallocate(cit)
+    return result
+
+
+def npyiter_has_finished(it: "nditer"):
+    cdef cnp.NpyIter* cit
+    try:
+        cit = npyiter_from_nditer_obj(it)
+        cnp.NpyIter_GotoIterIndex(cit, it.index)
+        return not (cnp.NpyIter_GetIterIndex(cit) < cnp.NpyIter_GetIterSize(cit))
+    finally:
+        cnp.NpyIter_Deallocate(cit)
+
+def compile_fillwithbyte():
+    # Regression test for gh-25878, mostly checks it compiles.
+    cdef cnp.npy_intp dims[2]
+    dims = (1, 2)
+    pos = cnp.PyArray_ZEROS(2, dims, cnp.NPY_UINT8, 0)
+    cnp.PyArray_FILLWBYTE(pos, 1)
+    return pos
+
+def inc2_cfloat_struct(cnp.ndarray[cnp.cfloat_t] arr):
+    # This works since we compile in C mode, it will fail in cpp mode
+    arr[1].real += 1
+    arr[1].imag += 1
+    # This works in both modes
+    arr[1].real = arr[1].real + 1
+    arr[1].imag = arr[1].imag + 1
+
+
+def check_npy_uintp_type_enum():
+    # Regression test for gh-27890: cnp.NPY_UINTP was not defined.
+    # Cython would fail to compile this before gh-27890 was fixed.
+    return cnp.NPY_UINTP > 0

mantis_evalkit/lib/python3.10/site-packages/numpy/_core/tests/examples/cython/meson.build

@@ -0,0 +1,43 @@
+project('checks', 'c', 'cython')
+
+py = import('python').find_installation(pure: false)
+
+cc = meson.get_compiler('c')
+cy = meson.get_compiler('cython')
+
+# Keep synced with pyproject.toml
+if not cy.version().version_compare('>=3.0.6')
+  error('tests requires Cython >= 3.0.6')
+endif
+
+cython_args = []
+if cy.version().version_compare('>=3.1.0')
+  cython_args += ['-Xfreethreading_compatible=True']
+endif
+
+npy_include_path = run_command(py, [
+    '-c',
+    'import os; os.chdir(".."); import numpy; print(os.path.abspath(numpy.get_include()))'
+    ], check: true).stdout().strip()
+
+npy_path = run_command(py, [
+    '-c',
+    'import os; os.chdir(".."); import numpy; print(os.path.dirname(numpy.__file__).removesuffix("numpy"))'
+    ], check: true).stdout().strip()
+
+# TODO: This is a hack due to gh-25135, where cython may not find the right
+#       __init__.pyd file.
+add_project_arguments('-I', npy_path, language : 'cython')
+
+py.extension_module(
+    'checks',
+    'checks.pyx',
+    install: false,
+    c_args: [
+      '-DNPY_NO_DEPRECATED_API=0',  # Cython still uses old NumPy C API
+      # Require 1.25+ to test datetime additions
+      '-DNPY_TARGET_VERSION=NPY_2_0_API_VERSION',
+    ],
+    include_directories: [npy_include_path],
+    cython_args: cython_args,
+)

mantis_evalkit/lib/python3.10/site-packages/numpy/_core/tests/examples/cython/setup.py

@@ -0,0 +1,37 @@
+"""
+Provide python-space access to the functions exposed in numpy/__init__.pxd
+for testing.
+"""
+
+import Cython
+import numpy as np
+from numpy._utils import _pep440
+from distutils.core import setup
+from Cython.Build import cythonize
+from setuptools.extension import Extension
+import os
+
+macros = [
+    ("NPY_NO_DEPRECATED_API", 0),
+    # Require 1.25+ to test datetime additions
+    ("NPY_TARGET_VERSION", "NPY_2_0_API_VERSION"),
+]
+
+checks = Extension(
+    "checks",
+    sources=[os.path.join('.', "checks.pyx")],
+    include_dirs=[np.get_include()],
+    define_macros=macros,
+)
+
+extensions = [checks]
+
+compiler_directives = {}
+if _pep440.parse(Cython.__version__) >= _pep440.parse("3.1.0a0"):
+    compiler_directives['freethreading_compatible'] = True
+
+setup(
+    ext_modules=cythonize(
+        extensions,
+        compiler_directives=compiler_directives)
+)

mantis_evalkit/lib/python3.10/site-packages/numpy/_core/tests/examples/limited_api/limited_api1.c

@@ -0,0 +1,17 @@
+#define Py_LIMITED_API 0x03060000
+
+#include <Python.h>
+#include <numpy/arrayobject.h>
+#include <numpy/ufuncobject.h>
+
+static PyModuleDef moduledef = {
+    .m_base = PyModuleDef_HEAD_INIT,
+    .m_name = "limited_api1"
+};
+
+PyMODINIT_FUNC PyInit_limited_api1(void)
+{
+    import_array();
+    import_umath();
+    return PyModule_Create(&moduledef);
+}

mantis_evalkit/lib/python3.10/site-packages/numpy/_core/tests/examples/limited_api/limited_api2.pyx

@@ -0,0 +1,11 @@
+#cython: language_level=3
+
+"""
+Make sure cython can compile in limited API mode (see meson.build)
+"""
+
+cdef extern from "numpy/arrayobject.h":
+    pass
+cdef extern from "numpy/arrayscalars.h":
+    pass
+

mantis_evalkit/lib/python3.10/site-packages/numpy/_core/tests/examples/limited_api/limited_api_latest.c

@@ -0,0 +1,19 @@
+#if Py_LIMITED_API != PY_VERSION_HEX & 0xffff0000
+    # error "Py_LIMITED_API not defined to Python major+minor version"
+#endif
+
+#include <Python.h>
+#include <numpy/arrayobject.h>
+#include <numpy/ufuncobject.h>
+
+static PyModuleDef moduledef = {
+    .m_base = PyModuleDef_HEAD_INIT,
+    .m_name = "limited_api_latest"
+};
+
+PyMODINIT_FUNC PyInit_limited_api_latest(void)
+{
+    import_array();
+    import_umath();
+    return PyModule_Create(&moduledef);
+}

mantis_evalkit/lib/python3.10/site-packages/numpy/_core/tests/examples/limited_api/meson.build

@@ -0,0 +1,59 @@
+project('checks', 'c', 'cython')
+
+py = import('python').find_installation(pure: false)
+
+cc = meson.get_compiler('c')
+cy = meson.get_compiler('cython')
+
+# Keep synced with pyproject.toml
+if not cy.version().version_compare('>=3.0.6')
+  error('tests requires Cython >= 3.0.6')
+endif
+
+npy_include_path = run_command(py, [
+    '-c',
+    'import os; os.chdir(".."); import numpy; print(os.path.abspath(numpy.get_include()))'
+    ], check: true).stdout().strip()
+
+npy_path = run_command(py, [
+    '-c',
+    'import os; os.chdir(".."); import numpy; print(os.path.dirname(numpy.__file__).removesuffix("numpy"))'
+    ], check: true).stdout().strip()
+
+# TODO: This is a hack due to https://github.com/cython/cython/issues/5820,
+# where cython may not find the right __init__.pyd file.
+add_project_arguments('-I', npy_path, language : 'cython')
+
+py.extension_module(
+    'limited_api1',
+    'limited_api1.c',
+    c_args: [
+      '-DNPY_NO_DEPRECATED_API=NPY_1_21_API_VERSION',
+    ],
+    include_directories: [npy_include_path],
+    limited_api: '3.6',
+)
+
+py.extension_module(
+    'limited_api_latest',
+    'limited_api_latest.c',
+    c_args: [
+      '-DNPY_NO_DEPRECATED_API=NPY_1_21_API_VERSION',
+    ],
+    include_directories: [npy_include_path],
+    limited_api: py.language_version(),
+)
+
+py.extension_module(
+    'limited_api2',
+    'limited_api2.pyx',
+    install: false,
+    c_args: [
+      '-DNPY_NO_DEPRECATED_API=0',
+      # Require 1.25+ to test datetime additions
+      '-DNPY_TARGET_VERSION=NPY_2_0_API_VERSION',
+      '-DCYTHON_LIMITED_API=1',
+    ],
+    include_directories: [npy_include_path],
+    limited_api: '3.7',
+)

mantis_evalkit/lib/python3.10/site-packages/numpy/_core/tests/examples/limited_api/setup.py

@@ -0,0 +1,22 @@
+"""
+Build an example package using the limited Python C API.
+"""
+
+import numpy as np
+from setuptools import setup, Extension
+import os
+
+macros = [("NPY_NO_DEPRECATED_API", 0), ("Py_LIMITED_API", "0x03060000")]
+
+limited_api = Extension(
+    "limited_api",
+    sources=[os.path.join('.', "limited_api.c")],
+    include_dirs=[np.get_include()],
+    define_macros=macros,
+)
+
+extensions = [limited_api]
+
+setup(
+    ext_modules=extensions
+)

mantis_evalkit/lib/python3.10/site-packages/numpy/_core/tests/test_abc.py

@@ -0,0 +1,54 @@
+from numpy.testing import assert_
+
+import numbers
+
+import numpy as np
+from numpy._core.numerictypes import sctypes
+
+class TestABC:
+    def test_abstract(self):
+        assert_(issubclass(np.number, numbers.Number))
+
+        assert_(issubclass(np.inexact, numbers.Complex))
+        assert_(issubclass(np.complexfloating, numbers.Complex))
+        assert_(issubclass(np.floating, numbers.Real))
+
+        assert_(issubclass(np.integer, numbers.Integral))
+        assert_(issubclass(np.signedinteger, numbers.Integral))
+        assert_(issubclass(np.unsignedinteger, numbers.Integral))
+
+    def test_floats(self):
+        for t in sctypes['float']:
+            assert_(isinstance(t(), numbers.Real),
+                    f"{t.__name__} is not instance of Real")
+            assert_(issubclass(t, numbers.Real),
+                    f"{t.__name__} is not subclass of Real")
+            assert_(not isinstance(t(), numbers.Rational),
+                    f"{t.__name__} is instance of Rational")
+            assert_(not issubclass(t, numbers.Rational),
+                    f"{t.__name__} is subclass of Rational")
+
+    def test_complex(self):
+        for t in sctypes['complex']:
+            assert_(isinstance(t(), numbers.Complex),
+                    f"{t.__name__} is not instance of Complex")
+            assert_(issubclass(t, numbers.Complex),
+                    f"{t.__name__} is not subclass of Complex")
+            assert_(not isinstance(t(), numbers.Real),
+                    f"{t.__name__} is instance of Real")
+            assert_(not issubclass(t, numbers.Real),
+                    f"{t.__name__} is subclass of Real")
+
+    def test_int(self):
+        for t in sctypes['int']:
+            assert_(isinstance(t(), numbers.Integral),
+                    f"{t.__name__} is not instance of Integral")
+            assert_(issubclass(t, numbers.Integral),
+                    f"{t.__name__} is not subclass of Integral")
+
+    def test_uint(self):
+        for t in sctypes['uint']:
+            assert_(isinstance(t(), numbers.Integral),
+                    f"{t.__name__} is not instance of Integral")
+            assert_(issubclass(t, numbers.Integral),
+                    f"{t.__name__} is not subclass of Integral")

mantis_evalkit/lib/python3.10/site-packages/numpy/_core/tests/test_api.py

@@ -0,0 +1,616 @@
+import sys
+
+import numpy as np
+import numpy._core.umath as ncu
+from numpy._core._rational_tests import rational
+import pytest
+from numpy.testing import (
+     assert_, assert_equal, assert_array_equal, assert_raises, assert_warns,
+     HAS_REFCOUNT
+    )
+
+
+def test_array_array():
+    tobj = type(object)
+    ones11 = np.ones((1, 1), np.float64)
+    tndarray = type(ones11)
+    # Test is_ndarray
+    assert_equal(np.array(ones11, dtype=np.float64), ones11)
+    if HAS_REFCOUNT:
+        old_refcount = sys.getrefcount(tndarray)
+        np.array(ones11)
+        assert_equal(old_refcount, sys.getrefcount(tndarray))
+
+    # test None
+    assert_equal(np.array(None, dtype=np.float64),
+                 np.array(np.nan, dtype=np.float64))
+    if HAS_REFCOUNT:
+        old_refcount = sys.getrefcount(tobj)
+        np.array(None, dtype=np.float64)
+        assert_equal(old_refcount, sys.getrefcount(tobj))
+
+    # test scalar
+    assert_equal(np.array(1.0, dtype=np.float64),
+                 np.ones((), dtype=np.float64))
+    if HAS_REFCOUNT:
+        old_refcount = sys.getrefcount(np.float64)
+        np.array(np.array(1.0, dtype=np.float64), dtype=np.float64)
+        assert_equal(old_refcount, sys.getrefcount(np.float64))
+
+    # test string
+    S2 = np.dtype((bytes, 2))
+    S3 = np.dtype((bytes, 3))
+    S5 = np.dtype((bytes, 5))
+    assert_equal(np.array(b"1.0", dtype=np.float64),
+                 np.ones((), dtype=np.float64))
+    assert_equal(np.array(b"1.0").dtype, S3)
+    assert_equal(np.array(b"1.0", dtype=bytes).dtype, S3)
+    assert_equal(np.array(b"1.0", dtype=S2), np.array(b"1."))
+    assert_equal(np.array(b"1", dtype=S5), np.ones((), dtype=S5))
+
+    # test string
+    U2 = np.dtype((str, 2))
+    U3 = np.dtype((str, 3))
+    U5 = np.dtype((str, 5))
+    assert_equal(np.array("1.0", dtype=np.float64),
+                 np.ones((), dtype=np.float64))
+    assert_equal(np.array("1.0").dtype, U3)
+    assert_equal(np.array("1.0", dtype=str).dtype, U3)
+    assert_equal(np.array("1.0", dtype=U2), np.array(str("1.")))
+    assert_equal(np.array("1", dtype=U5), np.ones((), dtype=U5))
+
+    builtins = getattr(__builtins__, '__dict__', __builtins__)
+    assert_(hasattr(builtins, 'get'))
+
+    # test memoryview
+    dat = np.array(memoryview(b'1.0'), dtype=np.float64)
+    assert_equal(dat, [49.0, 46.0, 48.0])
+    assert_(dat.dtype.type is np.float64)
+
+    dat = np.array(memoryview(b'1.0'))
+    assert_equal(dat, [49, 46, 48])
+    assert_(dat.dtype.type is np.uint8)
+
+    # test array interface
+    a = np.array(100.0, dtype=np.float64)
+    o = type("o", (object,),
+             dict(__array_interface__=a.__array_interface__))
+    assert_equal(np.array(o, dtype=np.float64), a)
+
+    # test array_struct interface
+    a = np.array([(1, 4.0, 'Hello'), (2, 6.0, 'World')],
+                 dtype=[('f0', int), ('f1', float), ('f2', str)])
+    o = type("o", (object,),
+             dict(__array_struct__=a.__array_struct__))
+    ## wasn't what I expected... is np.array(o) supposed to equal a ?
+    ## instead we get a array([...], dtype=">V18")
+    assert_equal(bytes(np.array(o).data), bytes(a.data))
+
+    # test array
+    def custom__array__(self, dtype=None, copy=None):
+        return np.array(100.0, dtype=dtype, copy=copy)
+
+    o = type("o", (object,), dict(__array__=custom__array__))()
+    assert_equal(np.array(o, dtype=np.float64), np.array(100.0, np.float64))
+
+    # test recursion
+    nested = 1.5
+    for i in range(ncu.MAXDIMS):
+        nested = [nested]
+
+    # no error
+    np.array(nested)
+
+    # Exceeds recursion limit
+    assert_raises(ValueError, np.array, [nested], dtype=np.float64)
+
+    # Try with lists...
+    # float32
+    assert_equal(np.array([None] * 10, dtype=np.float32),
+                 np.full((10,), np.nan, dtype=np.float32))
+    assert_equal(np.array([[None]] * 10, dtype=np.float32),
+                 np.full((10, 1), np.nan, dtype=np.float32))
+    assert_equal(np.array([[None] * 10], dtype=np.float32),
+                 np.full((1, 10), np.nan, dtype=np.float32))
+    assert_equal(np.array([[None] * 10] * 10, dtype=np.float32),
+                 np.full((10, 10), np.nan, dtype=np.float32))
+    # float64
+    assert_equal(np.array([None] * 10, dtype=np.float64),
+                 np.full((10,), np.nan, dtype=np.float64))
+    assert_equal(np.array([[None]] * 10, dtype=np.float64),
+                 np.full((10, 1), np.nan, dtype=np.float64))
+    assert_equal(np.array([[None] * 10], dtype=np.float64),
+                 np.full((1, 10), np.nan, dtype=np.float64))
+    assert_equal(np.array([[None] * 10] * 10, dtype=np.float64),
+                 np.full((10, 10), np.nan, dtype=np.float64))
+
+    assert_equal(np.array([1.0] * 10, dtype=np.float64),
+                 np.ones((10,), dtype=np.float64))
+    assert_equal(np.array([[1.0]] * 10, dtype=np.float64),
+                 np.ones((10, 1), dtype=np.float64))
+    assert_equal(np.array([[1.0] * 10], dtype=np.float64),
+                 np.ones((1, 10), dtype=np.float64))
+    assert_equal(np.array([[1.0] * 10] * 10, dtype=np.float64),
+                 np.ones((10, 10), dtype=np.float64))
+
+    # Try with tuples
+    assert_equal(np.array((None,) * 10, dtype=np.float64),
+                 np.full((10,), np.nan, dtype=np.float64))
+    assert_equal(np.array([(None,)] * 10, dtype=np.float64),
+                 np.full((10, 1), np.nan, dtype=np.float64))
+    assert_equal(np.array([(None,) * 10], dtype=np.float64),
+                 np.full((1, 10), np.nan, dtype=np.float64))
+    assert_equal(np.array([(None,) * 10] * 10, dtype=np.float64),
+                 np.full((10, 10), np.nan, dtype=np.float64))
+
+    assert_equal(np.array((1.0,) * 10, dtype=np.float64),
+                 np.ones((10,), dtype=np.float64))
+    assert_equal(np.array([(1.0,)] * 10, dtype=np.float64),
+                 np.ones((10, 1), dtype=np.float64))
+    assert_equal(np.array([(1.0,) * 10], dtype=np.float64),
+                 np.ones((1, 10), dtype=np.float64))
+    assert_equal(np.array([(1.0,) * 10] * 10, dtype=np.float64),
+                 np.ones((10, 10), dtype=np.float64))
+
+@pytest.mark.parametrize("array", [True, False])
+def test_array_impossible_casts(array):
+    # All builtin types can be forcibly cast, at least theoretically,
+    # but user dtypes cannot necessarily.
+    rt = rational(1, 2)
+    if array:
+        rt = np.array(rt)
+    with assert_raises(TypeError):
+        np.array(rt, dtype="M8")
+
+
+def test_array_astype():
+    a = np.arange(6, dtype='f4').reshape(2, 3)
+    # Default behavior: allows unsafe casts, keeps memory layout,
+    #                   always copies.
+    b = a.astype('i4')
+    assert_equal(a, b)
+    assert_equal(b.dtype, np.dtype('i4'))
+    assert_equal(a.strides, b.strides)
+    b = a.T.astype('i4')
+    assert_equal(a.T, b)
+    assert_equal(b.dtype, np.dtype('i4'))
+    assert_equal(a.T.strides, b.strides)
+    b = a.astype('f4')
+    assert_equal(a, b)
+    assert_(not (a is b))
+
+    # copy=False parameter skips a copy
+    b = a.astype('f4', copy=False)
+    assert_(a is b)
+
+    # order parameter allows overriding of the memory layout,
+    # forcing a copy if the layout is wrong
+    b = a.astype('f4', order='F', copy=False)
+    assert_equal(a, b)
+    assert_(not (a is b))
+    assert_(b.flags.f_contiguous)
+
+    b = a.astype('f4', order='C', copy=False)
+    assert_equal(a, b)
+    assert_(a is b)
+    assert_(b.flags.c_contiguous)
+
+    # casting parameter allows catching bad casts
+    b = a.astype('c8', casting='safe')
+    assert_equal(a, b)
+    assert_equal(b.dtype, np.dtype('c8'))
+
+    assert_raises(TypeError, a.astype, 'i4', casting='safe')
+
+    # subok=False passes through a non-subclassed array
+    b = a.astype('f4', subok=0, copy=False)
+    assert_(a is b)
+
+    class MyNDArray(np.ndarray):
+        pass
+
+    a = np.array([[0, 1, 2], [3, 4, 5]], dtype='f4').view(MyNDArray)
+
+    # subok=True passes through a subclass
+    b = a.astype('f4', subok=True, copy=False)
+    assert_(a is b)
+
+    # subok=True is default, and creates a subtype on a cast
+    b = a.astype('i4', copy=False)
+    assert_equal(a, b)
+    assert_equal(type(b), MyNDArray)
+
+    # subok=False never returns a subclass
+    b = a.astype('f4', subok=False, copy=False)
+    assert_equal(a, b)
+    assert_(not (a is b))
+    assert_(type(b) is not MyNDArray)
+
+    # Make sure converting from string object to fixed length string
+    # does not truncate.
+    a = np.array([b'a'*100], dtype='O')
+    b = a.astype('S')
+    assert_equal(a, b)
+    assert_equal(b.dtype, np.dtype('S100'))
+    a = np.array(['a'*100], dtype='O')
+    b = a.astype('U')
+    assert_equal(a, b)
+    assert_equal(b.dtype, np.dtype('U100'))
+
+    # Same test as above but for strings shorter than 64 characters
+    a = np.array([b'a'*10], dtype='O')
+    b = a.astype('S')
+    assert_equal(a, b)
+    assert_equal(b.dtype, np.dtype('S10'))
+    a = np.array(['a'*10], dtype='O')
+    b = a.astype('U')
+    assert_equal(a, b)
+    assert_equal(b.dtype, np.dtype('U10'))
+
+    a = np.array(123456789012345678901234567890, dtype='O').astype('S')
+    assert_array_equal(a, np.array(b'1234567890' * 3, dtype='S30'))
+    a = np.array(123456789012345678901234567890, dtype='O').astype('U')
+    assert_array_equal(a, np.array('1234567890' * 3, dtype='U30'))
+
+    a = np.array([123456789012345678901234567890], dtype='O').astype('S')
+    assert_array_equal(a, np.array(b'1234567890' * 3, dtype='S30'))
+    a = np.array([123456789012345678901234567890], dtype='O').astype('U')
+    assert_array_equal(a, np.array('1234567890' * 3, dtype='U30'))
+
+    a = np.array(123456789012345678901234567890, dtype='S')
+    assert_array_equal(a, np.array(b'1234567890' * 3, dtype='S30'))
+    a = np.array(123456789012345678901234567890, dtype='U')
+    assert_array_equal(a, np.array('1234567890' * 3, dtype='U30'))
+
+    a = np.array('a\u0140', dtype='U')
+    b = np.ndarray(buffer=a, dtype='uint32', shape=2)
+    assert_(b.size == 2)
+
+    a = np.array([1000], dtype='i4')
+    assert_raises(TypeError, a.astype, 'S1', casting='safe')
+
+    a = np.array(1000, dtype='i4')
+    assert_raises(TypeError, a.astype, 'U1', casting='safe')
+
+    # gh-24023
+    assert_raises(TypeError, a.astype)
+
+@pytest.mark.parametrize("dt", ["S", "U"])
+def test_array_astype_to_string_discovery_empty(dt):
+    # See also gh-19085
+    arr = np.array([""], dtype=object)
+    # Note, the itemsize is the `0 -> 1` logic, which should change.
+    # The important part the test is rather that it does not error.
+    assert arr.astype(dt).dtype.itemsize == np.dtype(f"{dt}1").itemsize
+
+    # check the same thing for `np.can_cast` (since it accepts arrays)
+    assert np.can_cast(arr, dt, casting="unsafe")
+    assert not np.can_cast(arr, dt, casting="same_kind")
+    # as well as for the object as a descriptor:
+    assert np.can_cast("O", dt, casting="unsafe")
+
+@pytest.mark.parametrize("dt", ["d", "f", "S13", "U32"])
+def test_array_astype_to_void(dt):
+    dt = np.dtype(dt)
+    arr = np.array([], dtype=dt)
+    assert arr.astype("V").dtype.itemsize == dt.itemsize
+
+def test_object_array_astype_to_void():
+    # This is different to `test_array_astype_to_void` as object arrays
+    # are inspected.  The default void is "V8" (8 is the length of double)
+    arr = np.array([], dtype="O").astype("V")
+    assert arr.dtype == "V8"
+
+@pytest.mark.parametrize("t",
+    np._core.sctypes['uint'] +
+    np._core.sctypes['int'] +
+    np._core.sctypes['float']
+)
+def test_array_astype_warning(t):
+    # test ComplexWarning when casting from complex to float or int
+    a = np.array(10, dtype=np.complex128)
+    assert_warns(np.exceptions.ComplexWarning, a.astype, t)
+
+@pytest.mark.parametrize(["dtype", "out_dtype"],
+        [(np.bytes_, np.bool),
+         (np.str_, np.bool),
+         (np.dtype("S10,S9"), np.dtype("?,?")),
+         # The following also checks unaligned unicode access:
+         (np.dtype("S7,U9"), np.dtype("?,?"))])
+def test_string_to_boolean_cast(dtype, out_dtype):
+    # Only the last two (empty) strings are falsy (the `\0` is stripped):
+    arr = np.array(
+            ["10", "10\0\0\0", "0\0\0", "0", "False", " ", "", "\0"],
+            dtype=dtype)
+    expected = np.array(
+            [True, True, True, True, True, True, False, False],
+            dtype=out_dtype)
+    assert_array_equal(arr.astype(out_dtype), expected)
+    # As it's similar, check that nonzero behaves the same (structs are
+    # nonzero if all entries are)
+    assert_array_equal(np.nonzero(arr), np.nonzero(expected))
+
+@pytest.mark.parametrize("str_type", [str, bytes, np.str_])
+@pytest.mark.parametrize("scalar_type",
+        [np.complex64, np.complex128, np.clongdouble])
+def test_string_to_complex_cast(str_type, scalar_type):
+    value = scalar_type(b"1+3j")
+    assert scalar_type(value) == 1+3j
+    assert np.array([value], dtype=object).astype(scalar_type)[()] == 1+3j
+    assert np.array(value).astype(scalar_type)[()] == 1+3j
+    arr = np.zeros(1, dtype=scalar_type)
+    arr[0] = value
+    assert arr[0] == 1+3j
+
+@pytest.mark.parametrize("dtype", np.typecodes["AllFloat"])
+def test_none_to_nan_cast(dtype):
+    # Note that at the time of writing this test, the scalar constructors
+    # reject None
+    arr = np.zeros(1, dtype=dtype)
+    arr[0] = None
+    assert np.isnan(arr)[0]
+    assert np.isnan(np.array(None, dtype=dtype))[()]
+    assert np.isnan(np.array([None], dtype=dtype))[0]
+    assert np.isnan(np.array(None).astype(dtype))[()]
+
+def test_copyto_fromscalar():
+    a = np.arange(6, dtype='f4').reshape(2, 3)
+
+    # Simple copy
+    np.copyto(a, 1.5)
+    assert_equal(a, 1.5)
+    np.copyto(a.T, 2.5)
+    assert_equal(a, 2.5)
+
+    # Where-masked copy
+    mask = np.array([[0, 1, 0], [0, 0, 1]], dtype='?')
+    np.copyto(a, 3.5, where=mask)
+    assert_equal(a, [[2.5, 3.5, 2.5], [2.5, 2.5, 3.5]])
+    mask = np.array([[0, 1], [1, 1], [1, 0]], dtype='?')
+    np.copyto(a.T, 4.5, where=mask)
+    assert_equal(a, [[2.5, 4.5, 4.5], [4.5, 4.5, 3.5]])
+
+def test_copyto():
+    a = np.arange(6, dtype='i4').reshape(2, 3)
+
+    # Simple copy
+    np.copyto(a, [[3, 1, 5], [6, 2, 1]])
+    assert_equal(a, [[3, 1, 5], [6, 2, 1]])
+
+    # Overlapping copy should work
+    np.copyto(a[:, :2], a[::-1, 1::-1])
+    assert_equal(a, [[2, 6, 5], [1, 3, 1]])
+
+    # Defaults to 'same_kind' casting
+    assert_raises(TypeError, np.copyto, a, 1.5)
+
+    # Force a copy with 'unsafe' casting, truncating 1.5 to 1
+    np.copyto(a, 1.5, casting='unsafe')
+    assert_equal(a, 1)
+
+    # Copying with a mask
+    np.copyto(a, 3, where=[True, False, True])
+    assert_equal(a, [[3, 1, 3], [3, 1, 3]])
+
+    # Casting rule still applies with a mask
+    assert_raises(TypeError, np.copyto, a, 3.5, where=[True, False, True])
+
+    # Lists of integer 0's and 1's is ok too
+    np.copyto(a, 4.0, casting='unsafe', where=[[0, 1, 1], [1, 0, 0]])
+    assert_equal(a, [[3, 4, 4], [4, 1, 3]])
+
+    # Overlapping copy with mask should work
+    np.copyto(a[:, :2], a[::-1, 1::-1], where=[[0, 1], [1, 1]])
+    assert_equal(a, [[3, 4, 4], [4, 3, 3]])
+
+    # 'dst' must be an array
+    assert_raises(TypeError, np.copyto, [1, 2, 3], [2, 3, 4])
+
+
+def test_copyto_cast_safety():
+    with pytest.raises(TypeError):
+        np.copyto(np.arange(3), 3., casting="safe")
+
+    # Can put integer and float scalars safely (and equiv):
+    np.copyto(np.arange(3), 3, casting="equiv")
+    np.copyto(np.arange(3.), 3., casting="equiv")
+    # And also with less precision safely:
+    np.copyto(np.arange(3, dtype="uint8"), 3, casting="safe")
+    np.copyto(np.arange(3., dtype="float32"), 3., casting="safe")
+
+    # But not equiv:
+    with pytest.raises(TypeError):
+        np.copyto(np.arange(3, dtype="uint8"), 3, casting="equiv")
+
+    with pytest.raises(TypeError):
+        np.copyto(np.arange(3., dtype="float32"), 3., casting="equiv")
+
+    # As a special thing, object is equiv currently:
+    np.copyto(np.arange(3, dtype=object), 3, casting="equiv")
+
+    # The following raises an overflow error/gives a warning but not
+    # type error (due to casting), though:
+    with pytest.raises(OverflowError):
+        np.copyto(np.arange(3), 2**80, casting="safe")
+
+    with pytest.warns(RuntimeWarning):
+        np.copyto(np.arange(3, dtype=np.float32), 2e300, casting="safe")
+
+
+def test_copyto_permut():
+    # test explicit overflow case
+    pad = 500
+    l = [True] * pad + [True, True, True, True]
+    r = np.zeros(len(l)-pad)
+    d = np.ones(len(l)-pad)
+    mask = np.array(l)[pad:]
+    np.copyto(r, d, where=mask[::-1])
+
+    # test all permutation of possible masks, 9 should be sufficient for
+    # current 4 byte unrolled code
+    power = 9
+    d = np.ones(power)
+    for i in range(2**power):
+        r = np.zeros(power)
+        l = [(i & x) != 0 for x in range(power)]
+        mask = np.array(l)
+        np.copyto(r, d, where=mask)
+        assert_array_equal(r == 1, l)
+        assert_equal(r.sum(), sum(l))
+
+        r = np.zeros(power)
+        np.copyto(r, d, where=mask[::-1])
+        assert_array_equal(r == 1, l[::-1])
+        assert_equal(r.sum(), sum(l))
+
+        r = np.zeros(power)
+        np.copyto(r[::2], d[::2], where=mask[::2])
+        assert_array_equal(r[::2] == 1, l[::2])
+        assert_equal(r[::2].sum(), sum(l[::2]))
+
+        r = np.zeros(power)
+        np.copyto(r[::2], d[::2], where=mask[::-2])
+        assert_array_equal(r[::2] == 1, l[::-2])
+        assert_equal(r[::2].sum(), sum(l[::-2]))
+
+        for c in [0xFF, 0x7F, 0x02, 0x10]:
+            r = np.zeros(power)
+            mask = np.array(l)
+            imask = np.array(l).view(np.uint8)
+            imask[mask != 0] = c
+            np.copyto(r, d, where=mask)
+            assert_array_equal(r == 1, l)
+            assert_equal(r.sum(), sum(l))
+
+    r = np.zeros(power)
+    np.copyto(r, d, where=True)
+    assert_equal(r.sum(), r.size)
+    r = np.ones(power)
+    d = np.zeros(power)
+    np.copyto(r, d, where=False)
+    assert_equal(r.sum(), r.size)
+
+def test_copy_order():
+    a = np.arange(24).reshape(2, 1, 3, 4)
+    b = a.copy(order='F')
+    c = np.arange(24).reshape(2, 1, 4, 3).swapaxes(2, 3)
+
+    def check_copy_result(x, y, ccontig, fcontig, strides=False):
+        assert_(not (x is y))
+        assert_equal(x, y)
+        assert_equal(res.flags.c_contiguous, ccontig)
+        assert_equal(res.flags.f_contiguous, fcontig)
+
+    # Validate the initial state of a, b, and c
+    assert_(a.flags.c_contiguous)
+    assert_(not a.flags.f_contiguous)
+    assert_(not b.flags.c_contiguous)
+    assert_(b.flags.f_contiguous)
+    assert_(not c.flags.c_contiguous)
+    assert_(not c.flags.f_contiguous)
+
+    # Copy with order='C'
+    res = a.copy(order='C')
+    check_copy_result(res, a, ccontig=True, fcontig=False, strides=True)
+    res = b.copy(order='C')
+    check_copy_result(res, b, ccontig=True, fcontig=False, strides=False)
+    res = c.copy(order='C')
+    check_copy_result(res, c, ccontig=True, fcontig=False, strides=False)
+    res = np.copy(a, order='C')
+    check_copy_result(res, a, ccontig=True, fcontig=False, strides=True)
+    res = np.copy(b, order='C')
+    check_copy_result(res, b, ccontig=True, fcontig=False, strides=False)
+    res = np.copy(c, order='C')
+    check_copy_result(res, c, ccontig=True, fcontig=False, strides=False)
+
+    # Copy with order='F'
+    res = a.copy(order='F')
+    check_copy_result(res, a, ccontig=False, fcontig=True, strides=False)
+    res = b.copy(order='F')
+    check_copy_result(res, b, ccontig=False, fcontig=True, strides=True)
+    res = c.copy(order='F')
+    check_copy_result(res, c, ccontig=False, fcontig=True, strides=False)
+    res = np.copy(a, order='F')
+    check_copy_result(res, a, ccontig=False, fcontig=True, strides=False)
+    res = np.copy(b, order='F')
+    check_copy_result(res, b, ccontig=False, fcontig=True, strides=True)
+    res = np.copy(c, order='F')
+    check_copy_result(res, c, ccontig=False, fcontig=True, strides=False)
+
+    # Copy with order='K'
+    res = a.copy(order='K')
+    check_copy_result(res, a, ccontig=True, fcontig=False, strides=True)
+    res = b.copy(order='K')
+    check_copy_result(res, b, ccontig=False, fcontig=True, strides=True)
+    res = c.copy(order='K')
+    check_copy_result(res, c, ccontig=False, fcontig=False, strides=True)
+    res = np.copy(a, order='K')
+    check_copy_result(res, a, ccontig=True, fcontig=False, strides=True)
+    res = np.copy(b, order='K')
+    check_copy_result(res, b, ccontig=False, fcontig=True, strides=True)
+    res = np.copy(c, order='K')
+    check_copy_result(res, c, ccontig=False, fcontig=False, strides=True)
+
+def test_contiguous_flags():
+    a = np.ones((4, 4, 1))[::2,:,:]
+    a.strides = a.strides[:2] + (-123,)
+    b = np.ones((2, 2, 1, 2, 2)).swapaxes(3, 4)
+
+    def check_contig(a, ccontig, fcontig):
+        assert_(a.flags.c_contiguous == ccontig)
+        assert_(a.flags.f_contiguous == fcontig)
+
+    # Check if new arrays are correct:
+    check_contig(a, False, False)
+    check_contig(b, False, False)
+    check_contig(np.empty((2, 2, 0, 2, 2)), True, True)
+    check_contig(np.array([[[1], [2]]], order='F'), True, True)
+    check_contig(np.empty((2, 2)), True, False)
+    check_contig(np.empty((2, 2), order='F'), False, True)
+
+    # Check that np.array creates correct contiguous flags:
+    check_contig(np.array(a, copy=None), False, False)
+    check_contig(np.array(a, copy=None, order='C'), True, False)
+    check_contig(np.array(a, ndmin=4, copy=None, order='F'), False, True)
+
+    # Check slicing update of flags and :
+    check_contig(a[0], True, True)
+    check_contig(a[None, ::4, ..., None], True, True)
+    check_contig(b[0, 0, ...], False, True)
+    check_contig(b[:, :, 0:0, :, :], True, True)
+
+    # Test ravel and squeeze.
+    check_contig(a.ravel(), True, True)
+    check_contig(np.ones((1, 3, 1)).squeeze(), True, True)
+
+def test_broadcast_arrays():
+    # Test user defined dtypes
+    a = np.array([(1, 2, 3)], dtype='u4,u4,u4')
+    b = np.array([(1, 2, 3), (4, 5, 6), (7, 8, 9)], dtype='u4,u4,u4')
+    result = np.broadcast_arrays(a, b)
+    assert_equal(result[0], np.array([(1, 2, 3), (1, 2, 3), (1, 2, 3)], dtype='u4,u4,u4'))
+    assert_equal(result[1], np.array([(1, 2, 3), (4, 5, 6), (7, 8, 9)], dtype='u4,u4,u4'))
+
+@pytest.mark.parametrize(["shape", "fill_value", "expected_output"],
+        [((2, 2), [5.0,  6.0], np.array([[5.0, 6.0], [5.0, 6.0]])),
+         ((3, 2), [1.0,  2.0], np.array([[1.0, 2.0], [1.0, 2.0], [1.0,  2.0]]))])
+def test_full_from_list(shape, fill_value, expected_output):
+    output = np.full(shape, fill_value)
+    assert_equal(output, expected_output)
+
+def test_astype_copyflag():
+    # test the various copyflag options
+    arr = np.arange(10, dtype=np.intp)
+
+    res_true = arr.astype(np.intp, copy=True)
+    assert not np.shares_memory(arr, res_true)
+
+    res_false = arr.astype(np.intp, copy=False)
+    assert np.shares_memory(arr, res_false)
+
+    res_false_float = arr.astype(np.float64, copy=False)
+    assert not np.shares_memory(arr, res_false_float)
+
+    # _CopyMode enum isn't allowed
+    assert_raises(ValueError, arr.astype, np.float64,
+                  copy=np._CopyMode.NEVER)

mantis_evalkit/lib/python3.10/site-packages/numpy/_core/tests/test_array_interface.py

@@ -0,0 +1,219 @@
+import sys
+import pytest
+import numpy as np
+from numpy.testing import extbuild, IS_WASM, IS_EDITABLE
+
+
+@pytest.fixture
+def get_module(tmp_path):
+    """ Some codes to generate data and manage temporary buffers use when
+    sharing with numpy via the array interface protocol.
+    """
+    if sys.platform.startswith('cygwin'):
+        pytest.skip('link fails on cygwin')
+    if IS_WASM:
+        pytest.skip("Can't build module inside Wasm")
+    if IS_EDITABLE:
+        pytest.skip("Can't build module for editable install")
+
+    prologue = '''
+        #include <Python.h>
+        #define NPY_NO_DEPRECATED_API NPY_1_7_API_VERSION
+        #include <numpy/arrayobject.h>
+        #include <stdio.h>
+        #include <math.h>
+
+        NPY_NO_EXPORT
+        void delete_array_struct(PyObject *cap) {
+
+            /* get the array interface structure */
+            PyArrayInterface *inter = (PyArrayInterface*)
+                PyCapsule_GetPointer(cap, NULL);
+
+            /* get the buffer by which data was shared */
+            double *ptr = (double*)PyCapsule_GetContext(cap);
+
+            /* for the purposes of the regression test set the elements
+               to nan */
+            for (npy_intp i = 0; i < inter->shape[0]; ++i)
+                ptr[i] = nan("");
+
+            /* free the shared buffer */
+            free(ptr);
+
+            /* free the array interface structure */
+            free(inter->shape);
+            free(inter);
+
+            fprintf(stderr, "delete_array_struct\\ncap = %ld inter = %ld"
+                " ptr = %ld\\n", (long)cap, (long)inter, (long)ptr);
+        }
+        '''
+
+    functions = [
+        ("new_array_struct", "METH_VARARGS", """
+
+            long long n_elem = 0;
+            double value = 0.0;
+
+            if (!PyArg_ParseTuple(args, "Ld", &n_elem, &value)) {
+                Py_RETURN_NONE;
+            }
+
+            /* allocate and initialize the data to share with numpy */
+            long long n_bytes = n_elem*sizeof(double);
+            double *data = (double*)malloc(n_bytes);
+
+            if (!data) {
+                PyErr_Format(PyExc_MemoryError,
+                    "Failed to malloc %lld bytes", n_bytes);
+
+                Py_RETURN_NONE;
+            }
+
+            for (long long i = 0; i < n_elem; ++i) {
+                data[i] = value;
+            }
+
+            /* calculate the shape and stride */
+            int nd = 1;
+
+            npy_intp *ss = (npy_intp*)malloc(2*nd*sizeof(npy_intp));
+            npy_intp *shape = ss;
+            npy_intp *stride = ss + nd;
+
+            shape[0] = n_elem;
+            stride[0] = sizeof(double);
+
+            /* construct the array interface */
+            PyArrayInterface *inter = (PyArrayInterface*)
+                malloc(sizeof(PyArrayInterface));
+
+            memset(inter, 0, sizeof(PyArrayInterface));
+
+            inter->two = 2;
+            inter->nd = nd;
+            inter->typekind = 'f';
+            inter->itemsize = sizeof(double);
+            inter->shape = shape;
+            inter->strides = stride;
+            inter->data = data;
+            inter->flags = NPY_ARRAY_WRITEABLE | NPY_ARRAY_NOTSWAPPED |
+                           NPY_ARRAY_ALIGNED | NPY_ARRAY_C_CONTIGUOUS;
+
+            /* package into a capsule */
+            PyObject *cap = PyCapsule_New(inter, NULL, delete_array_struct);
+
+            /* save the pointer to the data */
+            PyCapsule_SetContext(cap, data);
+
+            fprintf(stderr, "new_array_struct\\ncap = %ld inter = %ld"
+                " ptr = %ld\\n", (long)cap, (long)inter, (long)data);
+
+            return cap;
+        """)
+        ]
+
+    more_init = "import_array();"
+
+    try:
+        import array_interface_testing
+        return array_interface_testing
+    except ImportError:
+        pass
+
+    # if it does not exist, build and load it
+    return extbuild.build_and_import_extension('array_interface_testing',
+                                               functions,
+                                               prologue=prologue,
+                                               include_dirs=[np.get_include()],
+                                               build_dir=tmp_path,
+                                               more_init=more_init)
+
+
+@pytest.mark.slow
+def test_cstruct(get_module):
+
+    class data_source:
+        """
+        This class is for testing the timing of the PyCapsule destructor
+        invoked when numpy release its reference to the shared data as part of
+        the numpy array interface protocol. If the PyCapsule destructor is
+        called early the shared data is freed and invalid memory accesses will
+        occur.
+        """
+
+        def __init__(self, size, value):
+            self.size = size
+            self.value = value
+
+        @property
+        def __array_struct__(self):
+            return get_module.new_array_struct(self.size, self.value)
+
+    # write to the same stream as the C code
+    stderr = sys.__stderr__
+
+    # used to validate the shared data.
+    expected_value = -3.1415
+    multiplier = -10000.0
+
+    # create some data to share with numpy via the array interface
+    # assign the data an expected value.
+    stderr.write(' ---- create an object to share data ---- \n')
+    buf = data_source(256, expected_value)
+    stderr.write(' ---- OK!\n\n')
+
+    # share the data
+    stderr.write(' ---- share data via the array interface protocol ---- \n')
+    arr = np.array(buf, copy=False)
+    stderr.write('arr.__array_interface___ = %s\n' % (
+                 str(arr.__array_interface__)))
+    stderr.write('arr.base = %s\n' % (str(arr.base)))
+    stderr.write(' ---- OK!\n\n')
+
+    # release the source of the shared data. this will not release the data
+    # that was shared with numpy, that is done in the PyCapsule destructor.
+    stderr.write(' ---- destroy the object that shared data ---- \n')
+    buf = None
+    stderr.write(' ---- OK!\n\n')
+
+    # check that we got the expected data. If the PyCapsule destructor we
+    # defined was prematurely called then this test will fail because our
+    # destructor sets the elements of the array to NaN before free'ing the
+    # buffer. Reading the values here may also cause a SEGV
+    assert np.allclose(arr, expected_value)
+
+    # read the data. If the PyCapsule destructor we defined was prematurely
+    # called then reading the values here may cause a SEGV and will be reported
+    # as invalid reads by valgrind
+    stderr.write(' ---- read shared data ---- \n')
+    stderr.write('arr = %s\n' % (str(arr)))
+    stderr.write(' ---- OK!\n\n')
+
+    # write to the shared buffer. If the shared data was prematurely deleted
+    # this will may cause a SEGV and valgrind will report invalid writes
+    stderr.write(' ---- modify shared data ---- \n')
+    arr *= multiplier
+    expected_value *= multiplier
+    stderr.write('arr.__array_interface___ = %s\n' % (
+                 str(arr.__array_interface__)))
+    stderr.write('arr.base = %s\n' % (str(arr.base)))
+    stderr.write(' ---- OK!\n\n')
+
+    # read the data. If the shared data was prematurely deleted this
+    # will may cause a SEGV and valgrind will report invalid reads
+    stderr.write(' ---- read modified shared data ---- \n')
+    stderr.write('arr = %s\n' % (str(arr)))
+    stderr.write(' ---- OK!\n\n')
+
+    # check that we got the expected data. If the PyCapsule destructor we
+    # defined was prematurely called then this test will fail because our
+    # destructor sets the elements of the array to NaN before free'ing the
+    # buffer. Reading the values here may also cause a SEGV
+    assert np.allclose(arr, expected_value)
+
+    # free the shared data, the PyCapsule destructor should run here
+    stderr.write(' ---- free shared data ---- \n')
+    arr = None
+    stderr.write(' ---- OK!\n\n')

mantis_evalkit/lib/python3.10/site-packages/numpy/_core/tests/test_arraymethod.py

@@ -0,0 +1,86 @@
+"""
+This file tests the generic aspects of ArrayMethod.  At the time of writing
+this is private API, but when added, public API may be added here.
+"""
+
+from __future__ import annotations
+
+import types
+from typing import Any
+
+import pytest
+
+import numpy as np
+from numpy._core._multiarray_umath import _get_castingimpl as get_castingimpl
+
+
+class TestResolveDescriptors:
+    # Test mainly error paths of the resolve_descriptors function,
+    # note that the `casting_unittests` tests exercise this non-error paths.
+
+    # Casting implementations are the main/only current user:
+    method = get_castingimpl(type(np.dtype("d")), type(np.dtype("f")))
+
+    @pytest.mark.parametrize("args", [
+        (True,),  # Not a tuple.
+        ((None,)),  # Too few elements
+        ((None, None, None),),  # Too many
+        ((None, None),),  # Input dtype is None, which is invalid.
+        ((np.dtype("d"), True),),  # Output dtype is not a dtype
+        ((np.dtype("f"), None),),  # Input dtype does not match method
+    ])
+    def test_invalid_arguments(self, args):
+        with pytest.raises(TypeError):
+            self.method._resolve_descriptors(*args)
+
+
+class TestSimpleStridedCall:
+    # Test mainly error paths of the resolve_descriptors function,
+    # note that the `casting_unittests` tests exercise this non-error paths.
+
+    # Casting implementations are the main/only current user:
+    method = get_castingimpl(type(np.dtype("d")), type(np.dtype("f")))
+
+    @pytest.mark.parametrize(["args", "error"], [
+        ((True,), TypeError),  # Not a tuple
+        (((None,),), TypeError),  # Too few elements
+        ((None, None), TypeError),  # Inputs are not arrays.
+        (((None, None, None),), TypeError),  # Too many
+        (((np.arange(3), np.arange(3)),), TypeError),  # Incorrect dtypes
+        (((np.ones(3, dtype=">d"), np.ones(3, dtype="<f")),),
+         TypeError),  # Does not support byte-swapping
+        (((np.ones((2, 2), dtype="d"), np.ones((2, 2), dtype="f")),),
+         ValueError),  # not 1-D
+        (((np.ones(3, dtype="d"), np.ones(4, dtype="f")),),
+          ValueError),  # different length
+        (((np.frombuffer(b"\0x00"*3*2, dtype="d"),
+           np.frombuffer(b"\0x00"*3, dtype="f")),),
+         ValueError),  # output not writeable
+    ])
+    def test_invalid_arguments(self, args, error):
+        # This is private API, which may be modified freely
+        with pytest.raises(error):
+            self.method._simple_strided_call(*args)
+
+
+@pytest.mark.parametrize(
+    "cls", [
+        np.ndarray, np.recarray, np.char.chararray, np.matrix, np.memmap
+    ]
+)
+class TestClassGetItem:
+    def test_class_getitem(self, cls: type[np.ndarray]) -> None:
+        """Test `ndarray.__class_getitem__`."""
+        alias = cls[Any, Any]
+        assert isinstance(alias, types.GenericAlias)
+        assert alias.__origin__ is cls
+
+    @pytest.mark.parametrize("arg_len", range(4))
+    def test_subscript_tup(self, cls: type[np.ndarray], arg_len: int) -> None:
+        arg_tup = (Any,) * arg_len
+        if arg_len in (1, 2):
+            assert cls[arg_tup]
+        else:
+            match = f"Too {'few' if arg_len == 0 else 'many'} arguments"
+            with pytest.raises(TypeError, match=match):
+                cls[arg_tup]

mantis_evalkit/lib/python3.10/site-packages/numpy/_core/tests/test_arrayobject.py

@@ -0,0 +1,75 @@
+import pytest
+
+import numpy as np
+from numpy.testing import assert_array_equal
+
+
+def test_matrix_transpose_raises_error_for_1d():
+    msg = "matrix transpose with ndim < 2 is undefined"
+    arr = np.arange(48)
+    with pytest.raises(ValueError, match=msg):
+        arr.mT
+
+
+def test_matrix_transpose_equals_transpose_2d():
+    arr = np.arange(48).reshape((6, 8))
+    assert_array_equal(arr.T, arr.mT)
+
+
+ARRAY_SHAPES_TO_TEST = (
+    (5, 2),
+    (5, 2, 3),
+    (5, 2, 3, 4),
+)
+
+
+@pytest.mark.parametrize("shape", ARRAY_SHAPES_TO_TEST)
+def test_matrix_transpose_equals_swapaxes(shape):
+    num_of_axes = len(shape)
+    vec = np.arange(shape[-1])
+    arr = np.broadcast_to(vec, shape)
+    tgt = np.swapaxes(arr, num_of_axes - 2, num_of_axes - 1)
+    mT = arr.mT
+    assert_array_equal(tgt, mT)
+
+
+class MyArr(np.ndarray):
+    def __array_wrap__(self, arr, context=None, return_scalar=None):
+        return super().__array_wrap__(arr, context, return_scalar)
+
+
+class MyArrNoWrap(np.ndarray):
+    pass
+
+
+@pytest.mark.parametrize("subclass_self", [np.ndarray, MyArr, MyArrNoWrap])
+@pytest.mark.parametrize("subclass_arr", [np.ndarray, MyArr, MyArrNoWrap])
+def test_array_wrap(subclass_self, subclass_arr):
+    # NumPy should allow `__array_wrap__` to be called on arrays, it's logic
+    # is designed in a way that:
+    #
+    # * Subclasses never return scalars by default (to preserve their
+    #   information).  They can choose to if they wish.
+    # * NumPy returns scalars, if `return_scalar` is passed as True to allow
+    #   manual calls to `arr.__array_wrap__` to do the right thing.
+    # * The type of the input should be ignored (it should be a base-class
+    #   array, but I am not sure this is guaranteed).
+
+    arr = np.arange(3).view(subclass_self)
+
+    arr0d = np.array(3, dtype=np.int8).view(subclass_arr)
+    # With third argument True, ndarray allows "decay" to scalar.
+    # (I don't think NumPy would pass `None`, but it seems clear to support)
+    if subclass_self is np.ndarray:
+        assert type(arr.__array_wrap__(arr0d, None, True)) is np.int8
+    else:
+        assert type(arr.__array_wrap__(arr0d, None, True)) is type(arr)
+
+    # Otherwise, result should be viewed as the subclass
+    assert type(arr.__array_wrap__(arr0d)) is type(arr)
+    assert type(arr.__array_wrap__(arr0d, None, None)) is type(arr)
+    assert type(arr.__array_wrap__(arr0d, None, False)) is type(arr)
+
+    # Non 0-D array can't be converted to scalar, so we ignore that
+    arr1d = np.array([3], dtype=np.int8).view(subclass_arr)
+    assert type(arr.__array_wrap__(arr1d, None, True)) is type(arr)

mantis_evalkit/lib/python3.10/site-packages/numpy/_core/tests/test_casting_floatingpoint_errors.py

@@ -0,0 +1,154 @@
+import pytest
+from pytest import param
+from numpy.testing import IS_WASM
+import numpy as np
+
+
+def values_and_dtypes():
+    """
+    Generate value+dtype pairs that generate floating point errors during
+    casts.  The invalid casts to integers will generate "invalid" value
+    warnings, the float casts all generate "overflow".
+
+    (The Python int/float paths don't need to get tested in all the same
+    situations, but it does not hurt.)
+    """
+    # Casting to float16:
+    yield param(70000, "float16", id="int-to-f2")
+    yield param("70000", "float16", id="str-to-f2")
+    yield param(70000.0, "float16", id="float-to-f2")
+    yield param(np.longdouble(70000.), "float16", id="longdouble-to-f2")
+    yield param(np.float64(70000.), "float16", id="double-to-f2")
+    yield param(np.float32(70000.), "float16", id="float-to-f2")
+    # Casting to float32:
+    yield param(10**100, "float32", id="int-to-f4")
+    yield param(1e100, "float32", id="float-to-f2")
+    yield param(np.longdouble(1e300), "float32", id="longdouble-to-f2")
+    yield param(np.float64(1e300), "float32", id="double-to-f2")
+    # Casting to float64:
+    # If longdouble is double-double, its max can be rounded down to the double
+    # max.  So we correct the double spacing (a bit weird, admittedly):
+    max_ld = np.finfo(np.longdouble).max
+    spacing = np.spacing(np.nextafter(np.finfo("f8").max, 0))
+    if max_ld - spacing > np.finfo("f8").max:
+        yield param(np.finfo(np.longdouble).max, "float64",
+                    id="longdouble-to-f8")
+
+    # Cast to complex32:
+    yield param(2e300, "complex64", id="float-to-c8")
+    yield param(2e300+0j, "complex64", id="complex-to-c8")
+    yield param(2e300j, "complex64", id="complex-to-c8")
+    yield param(np.longdouble(2e300), "complex64", id="longdouble-to-c8")
+
+    # Invalid float to integer casts:
+    with np.errstate(over="ignore"):
+        for to_dt in np.typecodes["AllInteger"]:
+            for value in [np.inf, np.nan]:
+                for from_dt in np.typecodes["AllFloat"]:
+                    from_dt = np.dtype(from_dt)
+                    from_val = from_dt.type(value)
+
+                    yield param(from_val, to_dt, id=f"{from_val}-to-{to_dt}")
+
+
+def check_operations(dtype, value):
+    """
+    There are many dedicated paths in NumPy which cast and should check for
+    floating point errors which occurred during those casts.
+    """
+    if dtype.kind != 'i':
+        # These assignments use the stricter setitem logic:
+        def assignment():
+            arr = np.empty(3, dtype=dtype)
+            arr[0] = value
+
+        yield assignment
+
+        def fill():
+            arr = np.empty(3, dtype=dtype)
+            arr.fill(value)
+
+        yield fill
+
+    def copyto_scalar():
+        arr = np.empty(3, dtype=dtype)
+        np.copyto(arr, value, casting="unsafe")
+
+    yield copyto_scalar
+
+    def copyto():
+        arr = np.empty(3, dtype=dtype)
+        np.copyto(arr, np.array([value, value, value]), casting="unsafe")
+
+    yield copyto
+
+    def copyto_scalar_masked():
+        arr = np.empty(3, dtype=dtype)
+        np.copyto(arr, value, casting="unsafe",
+                  where=[True, False, True])
+
+    yield copyto_scalar_masked
+
+    def copyto_masked():
+        arr = np.empty(3, dtype=dtype)
+        np.copyto(arr, np.array([value, value, value]), casting="unsafe",
+                  where=[True, False, True])
+
+    yield copyto_masked
+
+    def direct_cast():
+        np.array([value, value, value]).astype(dtype)
+
+    yield direct_cast
+
+    def direct_cast_nd_strided():
+        arr = np.full((5, 5, 5), fill_value=value)[:, ::2, :]
+        arr.astype(dtype)
+
+    yield direct_cast_nd_strided
+
+    def boolean_array_assignment():
+        arr = np.empty(3, dtype=dtype)
+        arr[[True, False, True]] = np.array([value, value])
+
+    yield boolean_array_assignment
+
+    def integer_array_assignment():
+        arr = np.empty(3, dtype=dtype)
+        values = np.array([value, value])
+
+        arr[[0, 1]] = values
+
+    yield integer_array_assignment
+
+    def integer_array_assignment_with_subspace():
+        arr = np.empty((5, 3), dtype=dtype)
+        values = np.array([value, value, value])
+
+        arr[[0, 2]] = values
+
+    yield integer_array_assignment_with_subspace
+
+    def flat_assignment():
+        arr = np.empty((3,), dtype=dtype)
+        values = np.array([value, value, value])
+        arr.flat[:] = values
+
+    yield flat_assignment
+
+@pytest.mark.skipif(IS_WASM, reason="no wasm fp exception support")
+@pytest.mark.parametrize(["value", "dtype"], values_and_dtypes())
+@pytest.mark.filterwarnings("ignore::numpy.exceptions.ComplexWarning")
+def test_floatingpoint_errors_casting(dtype, value):
+    dtype = np.dtype(dtype)
+    for operation in check_operations(dtype, value):
+        dtype = np.dtype(dtype)
+
+        match = "invalid" if dtype.kind in 'iu' else "overflow"
+        with pytest.warns(RuntimeWarning, match=match):
+            operation()
+
+        with np.errstate(all="raise"):
+            with pytest.raises(FloatingPointError, match=match):
+                operation()
+

mantis_evalkit/lib/python3.10/site-packages/numpy/_core/tests/test_cpu_dispatcher.py

@@ -0,0 +1,45 @@
+from numpy._core._multiarray_umath import (
+    __cpu_features__, __cpu_baseline__, __cpu_dispatch__
+)
+from numpy._core import _umath_tests
+from numpy.testing import assert_equal
+
+def test_dispatcher():
+    """
+    Testing the utilities of the CPU dispatcher
+    """
+    targets = (
+        "SSE2", "SSE41", "AVX2",
+        "VSX", "VSX2", "VSX3",
+        "NEON", "ASIMD", "ASIMDHP",
+        "VX", "VXE"
+    )
+    highest_sfx = "" # no suffix for the baseline
+    all_sfx = []
+    for feature in reversed(targets):
+        # skip baseline features, by the default `CCompilerOpt` do not generate separated objects
+        # for the baseline,  just one object combined all of them via 'baseline' option
+        # within the configuration statements.
+        if feature in __cpu_baseline__:
+            continue
+        # check compiler and running machine support
+        if feature not in __cpu_dispatch__ or not __cpu_features__[feature]:
+            continue
+
+        if not highest_sfx:
+            highest_sfx = "_" + feature
+        all_sfx.append("func" + "_" + feature)
+
+    test = _umath_tests.test_dispatch()
+    assert_equal(test["func"], "func" + highest_sfx)
+    assert_equal(test["var"], "var"  + highest_sfx)
+
+    if highest_sfx:
+        assert_equal(test["func_xb"], "func" + highest_sfx)
+        assert_equal(test["var_xb"], "var"  + highest_sfx)
+    else:
+        assert_equal(test["func_xb"], "nobase")
+        assert_equal(test["var_xb"], "nobase")
+
+    all_sfx.append("func") # add the baseline
+    assert_equal(test["all"], all_sfx)

mantis_evalkit/lib/python3.10/site-packages/numpy/_core/tests/test_cpu_features.py

@@ -0,0 +1,416 @@
+import os
+import re
+import sys
+import pathlib
+import platform
+import subprocess
+import pytest
+from numpy._core._multiarray_umath import (
+    __cpu_features__,
+    __cpu_baseline__,
+    __cpu_dispatch__,
+)
+import numpy as np
+
+def assert_features_equal(actual, desired, fname):
+    __tracebackhide__ = True  # Hide traceback for py.test
+    actual, desired = str(actual), str(desired)
+    if actual == desired:
+        return
+    detected = str(__cpu_features__).replace("'", "")
+    try:
+        with open("/proc/cpuinfo") as fd:
+            cpuinfo = fd.read(2048)
+    except Exception as err:
+        cpuinfo = str(err)
+
+    try:
+        import subprocess
+        auxv = subprocess.check_output(['/bin/true'], env=dict(LD_SHOW_AUXV="1"))
+        auxv = auxv.decode()
+    except Exception as err:
+        auxv = str(err)
+
+    import textwrap
+    error_report = textwrap.indent(
+"""
+###########################################
+### Extra debugging information
+###########################################
+-------------------------------------------
+--- NumPy Detections
+-------------------------------------------
+%s
+-------------------------------------------
+--- SYS / CPUINFO
+-------------------------------------------
+%s....
+-------------------------------------------
+--- SYS / AUXV
+-------------------------------------------
+%s
+""" % (detected, cpuinfo, auxv), prefix='\r')
+
+    raise AssertionError((
+        "Failure Detection\n"
+        " NAME: '%s'\n"
+        " ACTUAL: %s\n"
+        " DESIRED: %s\n"
+        "%s"
+    ) % (fname, actual, desired, error_report))
+
+def _text_to_list(txt):
+    out = txt.strip("][\n").replace("'", "").split(', ')
+    return None if out[0] == "" else out
+
+class AbstractTest:
+    features = []
+    features_groups = {}
+    features_map = {}
+    features_flags = set()
+
+    def load_flags(self):
+        # a hook
+        pass
+    def test_features(self):
+        self.load_flags()
+        for gname, features in self.features_groups.items():
+            test_features = [self.cpu_have(f) for f in features]
+            assert_features_equal(__cpu_features__.get(gname), all(test_features), gname)
+
+        for feature_name in self.features:
+            cpu_have = self.cpu_have(feature_name)
+            npy_have = __cpu_features__.get(feature_name)
+            assert_features_equal(npy_have, cpu_have, feature_name)
+
+    def cpu_have(self, feature_name):
+        map_names = self.features_map.get(feature_name, feature_name)
+        if isinstance(map_names, str):
+            return map_names in self.features_flags
+        return any(f in self.features_flags for f in map_names)
+
+    def load_flags_cpuinfo(self, magic_key):
+        self.features_flags = self.get_cpuinfo_item(magic_key)
+
+    def get_cpuinfo_item(self, magic_key):
+        values = set()
+        with open('/proc/cpuinfo') as fd:
+            for line in fd:
+                if not line.startswith(magic_key):
+                    continue
+                flags_value = [s.strip() for s in line.split(':', 1)]
+                if len(flags_value) == 2:
+                    values = values.union(flags_value[1].upper().split())
+        return values
+
+    def load_flags_auxv(self):
+        auxv = subprocess.check_output(['/bin/true'], env=dict(LD_SHOW_AUXV="1"))
+        for at in auxv.split(b'\n'):
+            if not at.startswith(b"AT_HWCAP"):
+                continue
+            hwcap_value = [s.strip() for s in at.split(b':', 1)]
+            if len(hwcap_value) == 2:
+                self.features_flags = self.features_flags.union(
+                    hwcap_value[1].upper().decode().split()
+                )
+
+@pytest.mark.skipif(
+    sys.platform == 'emscripten',
+    reason= (
+        "The subprocess module is not available on WASM platforms and"
+        " therefore this test class cannot be properly executed."
+    ),
+)
+class TestEnvPrivation:
+    cwd = pathlib.Path(__file__).parent.resolve()
+    env = os.environ.copy()
+    _enable = os.environ.pop('NPY_ENABLE_CPU_FEATURES', None)
+    _disable = os.environ.pop('NPY_DISABLE_CPU_FEATURES', None)
+    SUBPROCESS_ARGS = dict(cwd=cwd, capture_output=True, text=True, check=True)
+    unavailable_feats = [
+        feat for feat in __cpu_dispatch__ if not __cpu_features__[feat]
+    ]
+    UNAVAILABLE_FEAT = (
+        None if len(unavailable_feats) == 0
+        else unavailable_feats[0]
+    )
+    BASELINE_FEAT = None if len(__cpu_baseline__) == 0 else __cpu_baseline__[0]
+    SCRIPT = """
+def main():
+    from numpy._core._multiarray_umath import (
+        __cpu_features__,
+        __cpu_dispatch__
+    )
+
+    detected = [feat for feat in __cpu_dispatch__ if __cpu_features__[feat]]
+    print(detected)
+
+if __name__ == "__main__":
+    main()
+    """
+
+    @pytest.fixture(autouse=True)
+    def setup_class(self, tmp_path_factory):
+        file = tmp_path_factory.mktemp("runtime_test_script")
+        file /= "_runtime_detect.py"
+        file.write_text(self.SCRIPT)
+        self.file = file
+        return
+
+    def _run(self):
+        return subprocess.run(
+            [sys.executable, self.file],
+            env=self.env,
+            **self.SUBPROCESS_ARGS,
+            )
+
+    # Helper function mimicking pytest.raises for subprocess call
+    def _expect_error(
+        self,
+        msg,
+        err_type,
+        no_error_msg="Failed to generate error"
+    ):
+        try:
+            self._run()
+        except subprocess.CalledProcessError as e:
+            assertion_message = f"Expected: {msg}\nGot: {e.stderr}"
+            assert re.search(msg, e.stderr), assertion_message
+
+            assertion_message = (
+                f"Expected error of type: {err_type}; see full "
+                f"error:\n{e.stderr}"
+            )
+            assert re.search(err_type, e.stderr), assertion_message
+        else:
+            assert False, no_error_msg
+
+    def setup_method(self):
+        """Ensure that the environment is reset"""
+        self.env = os.environ.copy()
+        return
+
+    def test_runtime_feature_selection(self):
+        """
+        Ensure that when selecting `NPY_ENABLE_CPU_FEATURES`, only the
+        features exactly specified are dispatched.
+        """
+
+        # Capture runtime-enabled features
+        out = self._run()
+        non_baseline_features = _text_to_list(out.stdout)
+
+        if non_baseline_features is None:
+            pytest.skip(
+                "No dispatchable features outside of baseline detected."
+            )
+        feature = non_baseline_features[0]
+
+        # Capture runtime-enabled features when `NPY_ENABLE_CPU_FEATURES` is
+        # specified
+        self.env['NPY_ENABLE_CPU_FEATURES'] = feature
+        out = self._run()
+        enabled_features = _text_to_list(out.stdout)
+
+        # Ensure that only one feature is enabled, and it is exactly the one
+        # specified by `NPY_ENABLE_CPU_FEATURES`
+        assert set(enabled_features) == {feature}
+
+        if len(non_baseline_features) < 2:
+            pytest.skip("Only one non-baseline feature detected.")
+        # Capture runtime-enabled features when `NPY_ENABLE_CPU_FEATURES` is
+        # specified
+        self.env['NPY_ENABLE_CPU_FEATURES'] = ",".join(non_baseline_features)
+        out = self._run()
+        enabled_features = _text_to_list(out.stdout)
+
+        # Ensure that both features are enabled, and they are exactly the ones
+        # specified by `NPY_ENABLE_CPU_FEATURES`
+        assert set(enabled_features) == set(non_baseline_features)
+        return
+
+    @pytest.mark.parametrize("enabled, disabled",
+    [
+        ("feature", "feature"),
+        ("feature", "same"),
+    ])
+    def test_both_enable_disable_set(self, enabled, disabled):
+        """
+        Ensure that when both environment variables are set then an
+        ImportError is thrown
+        """
+        self.env['NPY_ENABLE_CPU_FEATURES'] = enabled
+        self.env['NPY_DISABLE_CPU_FEATURES'] = disabled
+        msg = "Both NPY_DISABLE_CPU_FEATURES and NPY_ENABLE_CPU_FEATURES"
+        err_type = "ImportError"
+        self._expect_error(msg, err_type)
+
+    @pytest.mark.skipif(
+        not __cpu_dispatch__,
+        reason=(
+            "NPY_*_CPU_FEATURES only parsed if "
+            "`__cpu_dispatch__` is non-empty"
+        )
+    )
+    @pytest.mark.parametrize("action", ["ENABLE", "DISABLE"])
+    def test_variable_too_long(self, action):
+        """
+        Test that an error is thrown if the environment variables are too long
+        to be processed. Current limit is 1024, but this may change later.
+        """
+        MAX_VAR_LENGTH = 1024
+        # Actual length is MAX_VAR_LENGTH + 1 due to null-termination
+        self.env[f'NPY_{action}_CPU_FEATURES'] = "t" * MAX_VAR_LENGTH
+        msg = (
+            f"Length of environment variable 'NPY_{action}_CPU_FEATURES' is "
+            f"{MAX_VAR_LENGTH + 1}, only {MAX_VAR_LENGTH} accepted"
+        )
+        err_type = "RuntimeError"
+        self._expect_error(msg, err_type)
+
+    @pytest.mark.skipif(
+        not __cpu_dispatch__,
+        reason=(
+            "NPY_*_CPU_FEATURES only parsed if "
+            "`__cpu_dispatch__` is non-empty"
+        )
+    )
+    def test_impossible_feature_disable(self):
+        """
+        Test that a RuntimeError is thrown if an impossible feature-disabling
+        request is made. This includes disabling a baseline feature.
+        """
+
+        if self.BASELINE_FEAT is None:
+            pytest.skip("There are no unavailable features to test with")
+        bad_feature = self.BASELINE_FEAT
+        self.env['NPY_DISABLE_CPU_FEATURES'] = bad_feature
+        msg = (
+            f"You cannot disable CPU feature '{bad_feature}', since it is "
+            "part of the baseline optimizations"
+        )
+        err_type = "RuntimeError"
+        self._expect_error(msg, err_type)
+
+    def test_impossible_feature_enable(self):
+        """
+        Test that a RuntimeError is thrown if an impossible feature-enabling
+        request is made. This includes enabling a feature not supported by the
+        machine, or disabling a baseline optimization.
+        """
+
+        if self.UNAVAILABLE_FEAT is None:
+            pytest.skip("There are no unavailable features to test with")
+        bad_feature = self.UNAVAILABLE_FEAT
+        self.env['NPY_ENABLE_CPU_FEATURES'] = bad_feature
+        msg = (
+            f"You cannot enable CPU features \\({bad_feature}\\), since "
+            "they are not supported by your machine."
+        )
+        err_type = "RuntimeError"
+        self._expect_error(msg, err_type)
+
+        # Ensure that it fails even when providing garbage in addition
+        feats = f"{bad_feature}, Foobar"
+        self.env['NPY_ENABLE_CPU_FEATURES'] = feats
+        msg = (
+            f"You cannot enable CPU features \\({bad_feature}\\), since they "
+            "are not supported by your machine."
+        )
+        self._expect_error(msg, err_type)
+
+        if self.BASELINE_FEAT is not None:
+            # Ensure that only the bad feature gets reported
+            feats = f"{bad_feature}, {self.BASELINE_FEAT}"
+            self.env['NPY_ENABLE_CPU_FEATURES'] = feats
+            msg = (
+                f"You cannot enable CPU features \\({bad_feature}\\), since "
+                "they are not supported by your machine."
+            )
+            self._expect_error(msg, err_type)
+
+is_linux = sys.platform.startswith('linux')
+is_cygwin = sys.platform.startswith('cygwin')
+machine  = platform.machine()
+is_x86   = re.match("^(amd64|x86|i386|i686)", machine, re.IGNORECASE)
+@pytest.mark.skipif(
+    not (is_linux or is_cygwin) or not is_x86, reason="Only for Linux and x86"
+)
+class Test_X86_Features(AbstractTest):
+    features = [
+        "MMX", "SSE", "SSE2", "SSE3", "SSSE3", "SSE41", "POPCNT", "SSE42",
+        "AVX", "F16C", "XOP", "FMA4", "FMA3", "AVX2", "AVX512F", "AVX512CD",
+        "AVX512ER", "AVX512PF", "AVX5124FMAPS", "AVX5124VNNIW", "AVX512VPOPCNTDQ",
+        "AVX512VL", "AVX512BW", "AVX512DQ", "AVX512VNNI", "AVX512IFMA",
+        "AVX512VBMI", "AVX512VBMI2", "AVX512BITALG", "AVX512FP16",
+    ]
+    features_groups = dict(
+        AVX512_KNL = ["AVX512F", "AVX512CD", "AVX512ER", "AVX512PF"],
+        AVX512_KNM = ["AVX512F", "AVX512CD", "AVX512ER", "AVX512PF", "AVX5124FMAPS",
+                      "AVX5124VNNIW", "AVX512VPOPCNTDQ"],
+        AVX512_SKX = ["AVX512F", "AVX512CD", "AVX512BW", "AVX512DQ", "AVX512VL"],
+        AVX512_CLX = ["AVX512F", "AVX512CD", "AVX512BW", "AVX512DQ", "AVX512VL", "AVX512VNNI"],
+        AVX512_CNL = ["AVX512F", "AVX512CD", "AVX512BW", "AVX512DQ", "AVX512VL", "AVX512IFMA",
+                      "AVX512VBMI"],
+        AVX512_ICL = ["AVX512F", "AVX512CD", "AVX512BW", "AVX512DQ", "AVX512VL", "AVX512IFMA",
+                      "AVX512VBMI", "AVX512VNNI", "AVX512VBMI2", "AVX512BITALG", "AVX512VPOPCNTDQ"],
+        AVX512_SPR = ["AVX512F", "AVX512CD", "AVX512BW", "AVX512DQ",
+                      "AVX512VL", "AVX512IFMA", "AVX512VBMI", "AVX512VNNI",
+                      "AVX512VBMI2", "AVX512BITALG", "AVX512VPOPCNTDQ",
+                      "AVX512FP16"],
+    )
+    features_map = dict(
+        SSE3="PNI", SSE41="SSE4_1", SSE42="SSE4_2", FMA3="FMA",
+        AVX512VNNI="AVX512_VNNI", AVX512BITALG="AVX512_BITALG", AVX512VBMI2="AVX512_VBMI2",
+        AVX5124FMAPS="AVX512_4FMAPS", AVX5124VNNIW="AVX512_4VNNIW", AVX512VPOPCNTDQ="AVX512_VPOPCNTDQ",
+        AVX512FP16="AVX512_FP16",
+    )
+    def load_flags(self):
+        self.load_flags_cpuinfo("flags")
+
+is_power = re.match("^(powerpc|ppc)64", machine, re.IGNORECASE)
+@pytest.mark.skipif(not is_linux or not is_power, reason="Only for Linux and Power")
+class Test_POWER_Features(AbstractTest):
+    features = ["VSX", "VSX2", "VSX3", "VSX4"]
+    features_map = dict(VSX2="ARCH_2_07", VSX3="ARCH_3_00", VSX4="ARCH_3_1")
+
+    def load_flags(self):
+        self.load_flags_auxv()
+
+
+is_zarch = re.match("^(s390x)", machine, re.IGNORECASE)
+@pytest.mark.skipif(not is_linux or not is_zarch,
+                    reason="Only for Linux and IBM Z")
+class Test_ZARCH_Features(AbstractTest):
+    features = ["VX", "VXE", "VXE2"]
+
+    def load_flags(self):
+        self.load_flags_auxv()
+
+
+is_arm = re.match("^(arm|aarch64)", machine, re.IGNORECASE)
+@pytest.mark.skipif(not is_linux or not is_arm, reason="Only for Linux and ARM")
+class Test_ARM_Features(AbstractTest):
+    features = [
+        "SVE", "NEON", "ASIMD", "FPHP", "ASIMDHP", "ASIMDDP", "ASIMDFHM"
+    ]
+    features_groups = dict(
+        NEON_FP16  = ["NEON", "HALF"],
+        NEON_VFPV4 = ["NEON", "VFPV4"],
+    )
+    def load_flags(self):
+        self.load_flags_cpuinfo("Features")
+        arch = self.get_cpuinfo_item("CPU architecture")
+        # in case of mounting virtual filesystem of aarch64 kernel
+        is_rootfs_v8 = int('0'+next(iter(arch))) > 7 if arch else 0
+        if  re.match("^(aarch64|AARCH64)", machine) or is_rootfs_v8:
+            self.features_map = dict(
+                NEON="ASIMD", HALF="ASIMD", VFPV4="ASIMD"
+            )
+        else:
+            self.features_map = dict(
+                # ELF auxiliary vector and /proc/cpuinfo on Linux kernel(armv8 aarch32)
+                # doesn't provide information about ASIMD, so we assume that ASIMD is supported
+                # if the kernel reports any one of the following ARM8 features.
+                ASIMD=("AES", "SHA1", "SHA2", "PMULL", "CRC32")
+            )

mantis_evalkit/lib/python3.10/site-packages/numpy/_core/tests/test_cython.py

@@ -0,0 +1,303 @@
+from datetime import datetime
+import os
+import subprocess
+import sys
+import pytest
+
+import numpy as np
+from numpy.testing import assert_array_equal, IS_WASM, IS_EDITABLE
+
+# This import is copied from random.tests.test_extending
+try:
+    import cython
+    from Cython.Compiler.Version import version as cython_version
+except ImportError:
+    cython = None
+else:
+    from numpy._utils import _pep440
+
+    # Note: keep in sync with the one in pyproject.toml
+    required_version = "3.0.6"
+    if _pep440.parse(cython_version) < _pep440.Version(required_version):
+        # too old or wrong cython, skip the test
+        cython = None
+
+pytestmark = pytest.mark.skipif(cython is None, reason="requires cython")
+
+
+if IS_EDITABLE:
+    pytest.skip(
+        "Editable install doesn't support tests with a compile step",
+        allow_module_level=True
+    )
+
+
+@pytest.fixture(scope='module')
+def install_temp(tmpdir_factory):
+    # Based in part on test_cython from random.tests.test_extending
+    if IS_WASM:
+        pytest.skip("No subprocess")
+
+    srcdir = os.path.join(os.path.dirname(__file__), 'examples', 'cython')
+    build_dir = tmpdir_factory.mktemp("cython_test") / "build"
+    os.makedirs(build_dir, exist_ok=True)
+    # Ensure we use the correct Python interpreter even when `meson` is
+    # installed in a different Python environment (see gh-24956)
+    native_file = str(build_dir / 'interpreter-native-file.ini')
+    with open(native_file, 'w') as f:
+        f.write("[binaries]\n")
+        f.write(f"python = '{sys.executable}'\n")
+        f.write(f"python3 = '{sys.executable}'")
+
+    try:
+        subprocess.check_call(["meson", "--version"])
+    except FileNotFoundError:
+        pytest.skip("No usable 'meson' found")
+    if sys.platform == "win32":
+        subprocess.check_call(["meson", "setup",
+                               "--buildtype=release",
+                               "--vsenv", "--native-file", native_file,
+                               str(srcdir)],
+                              cwd=build_dir,
+                              )
+    else:
+        subprocess.check_call(["meson", "setup",
+                               "--native-file", native_file, str(srcdir)],
+                              cwd=build_dir
+                              )
+    try:
+        subprocess.check_call(["meson", "compile", "-vv"], cwd=build_dir)
+    except subprocess.CalledProcessError:
+        print("----------------")
+        print("meson build failed when doing")
+        print(f"'meson setup --native-file {native_file} {srcdir}'")
+        print("'meson compile -vv'")
+        print(f"in {build_dir}")
+        print("----------------")
+        raise
+
+    sys.path.append(str(build_dir))
+
+
+def test_is_timedelta64_object(install_temp):
+    import checks
+
+    assert checks.is_td64(np.timedelta64(1234))
+    assert checks.is_td64(np.timedelta64(1234, "ns"))
+    assert checks.is_td64(np.timedelta64("NaT", "ns"))
+
+    assert not checks.is_td64(1)
+    assert not checks.is_td64(None)
+    assert not checks.is_td64("foo")
+    assert not checks.is_td64(np.datetime64("now", "s"))
+
+
+def test_is_datetime64_object(install_temp):
+    import checks
+
+    assert checks.is_dt64(np.datetime64(1234, "ns"))
+    assert checks.is_dt64(np.datetime64("NaT", "ns"))
+
+    assert not checks.is_dt64(1)
+    assert not checks.is_dt64(None)
+    assert not checks.is_dt64("foo")
+    assert not checks.is_dt64(np.timedelta64(1234))
+
+
+def test_get_datetime64_value(install_temp):
+    import checks
+
+    dt64 = np.datetime64("2016-01-01", "ns")
+
+    result = checks.get_dt64_value(dt64)
+    expected = dt64.view("i8")
+
+    assert result == expected
+
+
+def test_get_timedelta64_value(install_temp):
+    import checks
+
+    td64 = np.timedelta64(12345, "h")
+
+    result = checks.get_td64_value(td64)
+    expected = td64.view("i8")
+
+    assert result == expected
+
+
+def test_get_datetime64_unit(install_temp):
+    import checks
+
+    dt64 = np.datetime64("2016-01-01", "ns")
+    result = checks.get_dt64_unit(dt64)
+    expected = 10
+    assert result == expected
+
+    td64 = np.timedelta64(12345, "h")
+    result = checks.get_dt64_unit(td64)
+    expected = 5
+    assert result == expected
+
+
+def test_abstract_scalars(install_temp):
+    import checks
+
+    assert checks.is_integer(1)
+    assert checks.is_integer(np.int8(1))
+    assert checks.is_integer(np.uint64(1))
+
+def test_default_int(install_temp):
+    import checks
+
+    assert checks.get_default_integer() is np.dtype(int)
+
+
+def test_ravel_axis(install_temp):
+    import checks
+
+    assert checks.get_ravel_axis() == np.iinfo("intc").min
+
+
+def test_convert_datetime64_to_datetimestruct(install_temp):
+    # GH#21199
+    import checks
+
+    res = checks.convert_datetime64_to_datetimestruct()
+
+    exp = {
+        "year": 2022,
+        "month": 3,
+        "day": 15,
+        "hour": 20,
+        "min": 1,
+        "sec": 55,
+        "us": 260292,
+        "ps": 0,
+        "as": 0,
+    }
+
+    assert res == exp
+
+
+class TestDatetimeStrings:
+    def test_make_iso_8601_datetime(self, install_temp):
+        # GH#21199
+        import checks
+        dt = datetime(2016, 6, 2, 10, 45, 19)
+        # uses NPY_FR_s
+        result = checks.make_iso_8601_datetime(dt)
+        assert result == b"2016-06-02T10:45:19"
+
+    def test_get_datetime_iso_8601_strlen(self, install_temp):
+        # GH#21199
+        import checks
+        # uses NPY_FR_ns
+        res = checks.get_datetime_iso_8601_strlen()
+        assert res == 48
+
+
+@pytest.mark.parametrize(
+    "arrays",
+    [
+        [np.random.rand(2)],
+        [np.random.rand(2), np.random.rand(3, 1)],
+        [np.random.rand(2), np.random.rand(2, 3, 2), np.random.rand(1, 3, 2)],
+        [np.random.rand(2, 1)] * 4 + [np.random.rand(1, 1, 1)],
+    ]
+)
+def test_multiiter_fields(install_temp, arrays):
+    import checks
+    bcast = np.broadcast(*arrays)
+
+    assert bcast.ndim == checks.get_multiiter_number_of_dims(bcast)
+    assert bcast.size == checks.get_multiiter_size(bcast)
+    assert bcast.numiter == checks.get_multiiter_num_of_iterators(bcast)
+    assert bcast.shape == checks.get_multiiter_shape(bcast)
+    assert bcast.index == checks.get_multiiter_current_index(bcast)
+    assert all(
+        x.base is y.base
+        for x, y in zip(bcast.iters, checks.get_multiiter_iters(bcast))
+    )
+
+
+def test_dtype_flags(install_temp):
+    import checks
+    dtype = np.dtype("i,O")  # dtype with somewhat interesting flags
+    assert dtype.flags == checks.get_dtype_flags(dtype)
+
+
+def test_conv_intp(install_temp):
+    import checks
+
+    class myint:
+        def __int__(self):
+            return 3
+
+    # These conversion passes via `__int__`, not `__index__`:
+    assert checks.conv_intp(3.) == 3
+    assert checks.conv_intp(myint()) == 3
+
+
+def test_npyiter_api(install_temp):
+    import checks
+    arr = np.random.rand(3, 2)
+
+    it = np.nditer(arr)
+    assert checks.get_npyiter_size(it) == it.itersize == np.prod(arr.shape)
+    assert checks.get_npyiter_ndim(it) == it.ndim == 1
+    assert checks.npyiter_has_index(it) == it.has_index == False
+
+    it = np.nditer(arr, flags=["c_index"])
+    assert checks.npyiter_has_index(it) == it.has_index == True
+    assert (
+        checks.npyiter_has_delayed_bufalloc(it)
+        == it.has_delayed_bufalloc
+        == False
+    )
+
+    it = np.nditer(arr, flags=["buffered", "delay_bufalloc"])
+    assert (
+        checks.npyiter_has_delayed_bufalloc(it)
+        == it.has_delayed_bufalloc
+        == True
+    )
+
+    it = np.nditer(arr, flags=["multi_index"])
+    assert checks.get_npyiter_size(it) == it.itersize == np.prod(arr.shape)
+    assert checks.npyiter_has_multi_index(it) == it.has_multi_index == True
+    assert checks.get_npyiter_ndim(it) == it.ndim == 2
+
+    arr2 = np.random.rand(2, 1, 2)
+    it = np.nditer([arr, arr2])
+    assert checks.get_npyiter_nop(it) == it.nop == 2
+    assert checks.get_npyiter_size(it) == it.itersize == 12
+    assert checks.get_npyiter_ndim(it) == it.ndim == 3
+    assert all(
+        x is y for x, y in zip(checks.get_npyiter_operands(it), it.operands)
+    )
+    assert all(
+        np.allclose(x, y)
+        for x, y in zip(checks.get_npyiter_itviews(it), it.itviews)
+    )
+
+
+def test_fillwithbytes(install_temp):
+    import checks
+
+    arr = checks.compile_fillwithbyte()
+    assert_array_equal(arr, np.ones((1, 2)))
+
+
+def test_complex(install_temp):
+    from checks import inc2_cfloat_struct
+
+    arr = np.array([0, 10+10j], dtype="F")
+    inc2_cfloat_struct(arr)
+    assert arr[1] == (12 + 12j)
+
+
+def test_npy_uintp_type_enum():
+    import checks
+    assert checks.check_npy_uintp_type_enum()
+

mantis_evalkit/lib/python3.10/site-packages/numpy/_core/tests/test_defchararray.py

@@ -0,0 +1,822 @@
+import pytest
+
+import numpy as np
+from numpy._core.multiarray import _vec_string
+from numpy.testing import (
+    assert_, assert_equal, assert_array_equal, assert_raises,
+    assert_raises_regex
+    )
+
+kw_unicode_true = {'unicode': True}  # make 2to3 work properly
+kw_unicode_false = {'unicode': False}
+
+class TestBasic:
+    def test_from_object_array(self):
+        A = np.array([['abc', 2],
+                      ['long   ', '0123456789']], dtype='O')
+        B = np.char.array(A)
+        assert_equal(B.dtype.itemsize, 10)
+        assert_array_equal(B, [[b'abc', b'2'],
+                               [b'long', b'0123456789']])
+
+    def test_from_object_array_unicode(self):
+        A = np.array([['abc', 'Sigma \u03a3'],
+                      ['long   ', '0123456789']], dtype='O')
+        assert_raises(ValueError, np.char.array, (A,))
+        B = np.char.array(A, **kw_unicode_true)
+        assert_equal(B.dtype.itemsize, 10 * np.array('a', 'U').dtype.itemsize)
+        assert_array_equal(B, [['abc', 'Sigma \u03a3'],
+                               ['long', '0123456789']])
+
+    def test_from_string_array(self):
+        A = np.array([[b'abc', b'foo'],
+                      [b'long   ', b'0123456789']])
+        assert_equal(A.dtype.type, np.bytes_)
+        B = np.char.array(A)
+        assert_array_equal(B, A)
+        assert_equal(B.dtype, A.dtype)
+        assert_equal(B.shape, A.shape)
+        B[0, 0] = 'changed'
+        assert_(B[0, 0] != A[0, 0])
+        C = np.char.asarray(A)
+        assert_array_equal(C, A)
+        assert_equal(C.dtype, A.dtype)
+        C[0, 0] = 'changed again'
+        assert_(C[0, 0] != B[0, 0])
+        assert_(C[0, 0] == A[0, 0])
+
+    def test_from_unicode_array(self):
+        A = np.array([['abc', 'Sigma \u03a3'],
+                      ['long   ', '0123456789']])
+        assert_equal(A.dtype.type, np.str_)
+        B = np.char.array(A)
+        assert_array_equal(B, A)
+        assert_equal(B.dtype, A.dtype)
+        assert_equal(B.shape, A.shape)
+        B = np.char.array(A, **kw_unicode_true)
+        assert_array_equal(B, A)
+        assert_equal(B.dtype, A.dtype)
+        assert_equal(B.shape, A.shape)
+
+        def fail():
+            np.char.array(A, **kw_unicode_false)
+
+        assert_raises(UnicodeEncodeError, fail)
+
+    def test_unicode_upconvert(self):
+        A = np.char.array(['abc'])
+        B = np.char.array(['\u03a3'])
+        assert_(issubclass((A + B).dtype.type, np.str_))
+
+    def test_from_string(self):
+        A = np.char.array(b'abc')
+        assert_equal(len(A), 1)
+        assert_equal(len(A[0]), 3)
+        assert_(issubclass(A.dtype.type, np.bytes_))
+
+    def test_from_unicode(self):
+        A = np.char.array('\u03a3')
+        assert_equal(len(A), 1)
+        assert_equal(len(A[0]), 1)
+        assert_equal(A.itemsize, 4)
+        assert_(issubclass(A.dtype.type, np.str_))
+
+class TestVecString:
+    def test_non_existent_method(self):
+
+        def fail():
+            _vec_string('a', np.bytes_, 'bogus')
+
+        assert_raises(AttributeError, fail)
+
+    def test_non_string_array(self):
+
+        def fail():
+            _vec_string(1, np.bytes_, 'strip')
+
+        assert_raises(TypeError, fail)
+
+    def test_invalid_args_tuple(self):
+
+        def fail():
+            _vec_string(['a'], np.bytes_, 'strip', 1)
+
+        assert_raises(TypeError, fail)
+
+    def test_invalid_type_descr(self):
+
+        def fail():
+            _vec_string(['a'], 'BOGUS', 'strip')
+
+        assert_raises(TypeError, fail)
+
+    def test_invalid_function_args(self):
+
+        def fail():
+            _vec_string(['a'], np.bytes_, 'strip', (1,))
+
+        assert_raises(TypeError, fail)
+
+    def test_invalid_result_type(self):
+
+        def fail():
+            _vec_string(['a'], np.int_, 'strip')
+
+        assert_raises(TypeError, fail)
+
+    def test_broadcast_error(self):
+
+        def fail():
+            _vec_string([['abc', 'def']], np.int_, 'find', (['a', 'd', 'j'],))
+
+        assert_raises(ValueError, fail)
+
+
+class TestWhitespace:
+    def setup_method(self):
+        self.A = np.array([['abc ', '123  '],
+                           ['789 ', 'xyz ']]).view(np.char.chararray)
+        self.B = np.array([['abc', '123'],
+                           ['789', 'xyz']]).view(np.char.chararray)
+
+    def test1(self):
+        assert_(np.all(self.A == self.B))
+        assert_(np.all(self.A >= self.B))
+        assert_(np.all(self.A <= self.B))
+        assert_(not np.any(self.A > self.B))
+        assert_(not np.any(self.A < self.B))
+        assert_(not np.any(self.A != self.B))
+
+class TestChar:
+    def setup_method(self):
+        self.A = np.array('abc1', dtype='c').view(np.char.chararray)
+
+    def test_it(self):
+        assert_equal(self.A.shape, (4,))
+        assert_equal(self.A.upper()[:2].tobytes(), b'AB')
+
+class TestComparisons:
+    def setup_method(self):
+        self.A = np.array([['abc', 'abcc', '123'],
+                           ['789', 'abc', 'xyz']]).view(np.char.chararray)
+        self.B = np.array([['efg', 'efg', '123  '],
+                           ['051', 'efgg', 'tuv']]).view(np.char.chararray)
+
+    def test_not_equal(self):
+        assert_array_equal((self.A != self.B),
+                           [[True, True, False], [True, True, True]])
+
+    def test_equal(self):
+        assert_array_equal((self.A == self.B),
+                           [[False, False, True], [False, False, False]])
+
+    def test_greater_equal(self):
+        assert_array_equal((self.A >= self.B),
+                           [[False, False, True], [True, False, True]])
+
+    def test_less_equal(self):
+        assert_array_equal((self.A <= self.B),
+                           [[True, True, True], [False, True, False]])
+
+    def test_greater(self):
+        assert_array_equal((self.A > self.B),
+                           [[False, False, False], [True, False, True]])
+
+    def test_less(self):
+        assert_array_equal((self.A < self.B),
+                           [[True, True, False], [False, True, False]])
+
+    def test_type(self):
+        out1 = np.char.equal(self.A, self.B)
+        out2 = np.char.equal('a', 'a')
+        assert_(isinstance(out1, np.ndarray))
+        assert_(isinstance(out2, np.ndarray))
+
+class TestComparisonsMixed1(TestComparisons):
+    """Ticket #1276"""
+
+    def setup_method(self):
+        TestComparisons.setup_method(self)
+        self.B = np.array(
+            [['efg', 'efg', '123  '],
+             ['051', 'efgg', 'tuv']], np.str_).view(np.char.chararray)
+
+class TestComparisonsMixed2(TestComparisons):
+    """Ticket #1276"""
+
+    def setup_method(self):
+        TestComparisons.setup_method(self)
+        self.A = np.array(
+            [['abc', 'abcc', '123'],
+             ['789', 'abc', 'xyz']], np.str_).view(np.char.chararray)
+
+class TestInformation:
+    def setup_method(self):
+        self.A = np.array([[' abc ', ''],
+                           ['12345', 'MixedCase'],
+                           ['123 \t 345 \0 ', 'UPPER']]) \
+                            .view(np.char.chararray)
+        self.B = np.array([[' \u03a3 ', ''],
+                           ['12345', 'MixedCase'],
+                           ['123 \t 345 \0 ', 'UPPER']]) \
+                            .view(np.char.chararray)
+        # Array with longer strings, > MEMCHR_CUT_OFF in code.
+        self.C = (np.array(['ABCDEFGHIJKLMNOPQRSTUVWXYZ',
+                            '01234567890123456789012345'])
+                  .view(np.char.chararray))
+
+    def test_len(self):
+        assert_(issubclass(np.char.str_len(self.A).dtype.type, np.integer))
+        assert_array_equal(np.char.str_len(self.A), [[5, 0], [5, 9], [12, 5]])
+        assert_array_equal(np.char.str_len(self.B), [[3, 0], [5, 9], [12, 5]])
+
+    def test_count(self):
+        assert_(issubclass(self.A.count('').dtype.type, np.integer))
+        assert_array_equal(self.A.count('a'), [[1, 0], [0, 1], [0, 0]])
+        assert_array_equal(self.A.count('123'), [[0, 0], [1, 0], [1, 0]])
+        # Python doesn't seem to like counting NULL characters
+        # assert_array_equal(self.A.count('\0'), [[0, 0], [0, 0], [1, 0]])
+        assert_array_equal(self.A.count('a', 0, 2), [[1, 0], [0, 0], [0, 0]])
+        assert_array_equal(self.B.count('a'), [[0, 0], [0, 1], [0, 0]])
+        assert_array_equal(self.B.count('123'), [[0, 0], [1, 0], [1, 0]])
+        # assert_array_equal(self.B.count('\0'), [[0, 0], [0, 0], [1, 0]])
+
+    def test_endswith(self):
+        assert_(issubclass(self.A.endswith('').dtype.type, np.bool))
+        assert_array_equal(self.A.endswith(' '), [[1, 0], [0, 0], [1, 0]])
+        assert_array_equal(self.A.endswith('3', 0, 3), [[0, 0], [1, 0], [1, 0]])
+
+        def fail():
+            self.A.endswith('3', 'fdjk')
+
+        assert_raises(TypeError, fail)
+
+    @pytest.mark.parametrize(
+        "dtype, encode",
+        [("U", str),
+         ("S", lambda x: x.encode('ascii')),
+         ])
+    def test_find(self, dtype, encode):
+        A = self.A.astype(dtype)
+        assert_(issubclass(A.find(encode('a')).dtype.type, np.integer))
+        assert_array_equal(A.find(encode('a')),
+                           [[1, -1], [-1, 6], [-1, -1]])
+        assert_array_equal(A.find(encode('3')),
+                           [[-1, -1], [2, -1], [2, -1]])
+        assert_array_equal(A.find(encode('a'), 0, 2),
+                           [[1, -1], [-1, -1], [-1, -1]])
+        assert_array_equal(A.find([encode('1'), encode('P')]),
+                           [[-1, -1], [0, -1], [0, 1]])
+        C = self.C.astype(dtype)
+        assert_array_equal(C.find(encode('M')), [12, -1])
+
+    def test_index(self):
+
+        def fail():
+            self.A.index('a')
+
+        assert_raises(ValueError, fail)
+        assert_(np.char.index('abcba', 'b') == 1)
+        assert_(issubclass(np.char.index('abcba', 'b').dtype.type, np.integer))
+
+    def test_isalnum(self):
+        assert_(issubclass(self.A.isalnum().dtype.type, np.bool))
+        assert_array_equal(self.A.isalnum(), [[False, False], [True, True], [False, True]])
+
+    def test_isalpha(self):
+        assert_(issubclass(self.A.isalpha().dtype.type, np.bool))
+        assert_array_equal(self.A.isalpha(), [[False, False], [False, True], [False, True]])
+
+    def test_isdigit(self):
+        assert_(issubclass(self.A.isdigit().dtype.type, np.bool))
+        assert_array_equal(self.A.isdigit(), [[False, False], [True, False], [False, False]])
+
+    def test_islower(self):
+        assert_(issubclass(self.A.islower().dtype.type, np.bool))
+        assert_array_equal(self.A.islower(), [[True, False], [False, False], [False, False]])
+
+    def test_isspace(self):
+        assert_(issubclass(self.A.isspace().dtype.type, np.bool))
+        assert_array_equal(self.A.isspace(), [[False, False], [False, False], [False, False]])
+
+    def test_istitle(self):
+        assert_(issubclass(self.A.istitle().dtype.type, np.bool))
+        assert_array_equal(self.A.istitle(), [[False, False], [False, False], [False, False]])
+
+    def test_isupper(self):
+        assert_(issubclass(self.A.isupper().dtype.type, np.bool))
+        assert_array_equal(self.A.isupper(), [[False, False], [False, False], [False, True]])
+
+    def test_rfind(self):
+        assert_(issubclass(self.A.rfind('a').dtype.type, np.integer))
+        assert_array_equal(self.A.rfind('a'), [[1, -1], [-1, 6], [-1, -1]])
+        assert_array_equal(self.A.rfind('3'), [[-1, -1], [2, -1], [6, -1]])
+        assert_array_equal(self.A.rfind('a', 0, 2), [[1, -1], [-1, -1], [-1, -1]])
+        assert_array_equal(self.A.rfind(['1', 'P']), [[-1, -1], [0, -1], [0, 2]])
+
+    def test_rindex(self):
+
+        def fail():
+            self.A.rindex('a')
+
+        assert_raises(ValueError, fail)
+        assert_(np.char.rindex('abcba', 'b') == 3)
+        assert_(issubclass(np.char.rindex('abcba', 'b').dtype.type, np.integer))
+
+    def test_startswith(self):
+        assert_(issubclass(self.A.startswith('').dtype.type, np.bool))
+        assert_array_equal(self.A.startswith(' '), [[1, 0], [0, 0], [0, 0]])
+        assert_array_equal(self.A.startswith('1', 0, 3), [[0, 0], [1, 0], [1, 0]])
+
+        def fail():
+            self.A.startswith('3', 'fdjk')
+
+        assert_raises(TypeError, fail)
+
+
+class TestMethods:
+    def setup_method(self):
+        self.A = np.array([[' abc ', ''],
+                           ['12345', 'MixedCase'],
+                           ['123 \t 345 \0 ', 'UPPER']],
+                          dtype='S').view(np.char.chararray)
+        self.B = np.array([[' \u03a3 ', ''],
+                           ['12345', 'MixedCase'],
+                           ['123 \t 345 \0 ', 'UPPER']]).view(
+                                                            np.char.chararray)
+
+    def test_capitalize(self):
+        tgt = [[b' abc ', b''],
+               [b'12345', b'Mixedcase'],
+               [b'123 \t 345 \0 ', b'Upper']]
+        assert_(issubclass(self.A.capitalize().dtype.type, np.bytes_))
+        assert_array_equal(self.A.capitalize(), tgt)
+
+        tgt = [[' \u03c3 ', ''],
+               ['12345', 'Mixedcase'],
+               ['123 \t 345 \0 ', 'Upper']]
+        assert_(issubclass(self.B.capitalize().dtype.type, np.str_))
+        assert_array_equal(self.B.capitalize(), tgt)
+
+    def test_center(self):
+        assert_(issubclass(self.A.center(10).dtype.type, np.bytes_))
+        C = self.A.center([10, 20])
+        assert_array_equal(np.char.str_len(C), [[10, 20], [10, 20], [12, 20]])
+
+        C = self.A.center(20, b'#')
+        assert_(np.all(C.startswith(b'#')))
+        assert_(np.all(C.endswith(b'#')))
+
+        C = np.char.center(b'FOO', [[10, 20], [15, 8]])
+        tgt = [[b'   FOO    ', b'        FOO         '],
+               [b'      FOO      ', b'  FOO   ']]
+        assert_(issubclass(C.dtype.type, np.bytes_))
+        assert_array_equal(C, tgt)
+
+    def test_decode(self):
+        A = np.char.array([b'\\u03a3'])
+        assert_(A.decode('unicode-escape')[0] == '\u03a3')
+
+    def test_encode(self):
+        B = self.B.encode('unicode_escape')
+        assert_(B[0][0] == str(' \\u03a3 ').encode('latin1'))
+
+    def test_expandtabs(self):
+        T = self.A.expandtabs()
+        assert_(T[2, 0] == b'123      345 \0')
+
+    def test_join(self):
+        # NOTE: list(b'123') == [49, 50, 51]
+        #       so that b','.join(b'123') results to an error on Py3
+        A0 = self.A.decode('ascii')
+
+        A = np.char.join([',', '#'], A0)
+        assert_(issubclass(A.dtype.type, np.str_))
+        tgt = np.array([[' ,a,b,c, ', ''],
+                        ['1,2,3,4,5', 'M#i#x#e#d#C#a#s#e'],
+                        ['1,2,3, ,\t, ,3,4,5, ,\x00, ', 'U#P#P#E#R']])
+        assert_array_equal(np.char.join([',', '#'], A0), tgt)
+
+    def test_ljust(self):
+        assert_(issubclass(self.A.ljust(10).dtype.type, np.bytes_))
+
+        C = self.A.ljust([10, 20])
+        assert_array_equal(np.char.str_len(C), [[10, 20], [10, 20], [12, 20]])
+
+        C = self.A.ljust(20, b'#')
+        assert_array_equal(C.startswith(b'#'), [
+                [False, True], [False, False], [False, False]])
+        assert_(np.all(C.endswith(b'#')))
+
+        C = np.char.ljust(b'FOO', [[10, 20], [15, 8]])
+        tgt = [[b'FOO       ', b'FOO                 '],
+               [b'FOO            ', b'FOO     ']]
+        assert_(issubclass(C.dtype.type, np.bytes_))
+        assert_array_equal(C, tgt)
+
+    def test_lower(self):
+        tgt = [[b' abc ', b''],
+               [b'12345', b'mixedcase'],
+               [b'123 \t 345 \0 ', b'upper']]
+        assert_(issubclass(self.A.lower().dtype.type, np.bytes_))
+        assert_array_equal(self.A.lower(), tgt)
+
+        tgt = [[' \u03c3 ', ''],
+               ['12345', 'mixedcase'],
+               ['123 \t 345 \0 ', 'upper']]
+        assert_(issubclass(self.B.lower().dtype.type, np.str_))
+        assert_array_equal(self.B.lower(), tgt)
+
+    def test_lstrip(self):
+        tgt = [[b'abc ', b''],
+               [b'12345', b'MixedCase'],
+               [b'123 \t 345 \0 ', b'UPPER']]
+        assert_(issubclass(self.A.lstrip().dtype.type, np.bytes_))
+        assert_array_equal(self.A.lstrip(), tgt)
+
+        tgt = [[b' abc', b''],
+               [b'2345', b'ixedCase'],
+               [b'23 \t 345 \x00', b'UPPER']]
+        assert_array_equal(self.A.lstrip([b'1', b'M']), tgt)
+
+        tgt = [['\u03a3 ', ''],
+               ['12345', 'MixedCase'],
+               ['123 \t 345 \0 ', 'UPPER']]
+        assert_(issubclass(self.B.lstrip().dtype.type, np.str_))
+        assert_array_equal(self.B.lstrip(), tgt)
+
+    def test_partition(self):
+        P = self.A.partition([b'3', b'M'])
+        tgt = [[(b' abc ', b'', b''), (b'', b'', b'')],
+               [(b'12', b'3', b'45'), (b'', b'M', b'ixedCase')],
+               [(b'12', b'3', b' \t 345 \0 '), (b'UPPER', b'', b'')]]
+        assert_(issubclass(P.dtype.type, np.bytes_))
+        assert_array_equal(P, tgt)
+
+    def test_replace(self):
+        R = self.A.replace([b'3', b'a'],
+                           [b'##########', b'@'])
+        tgt = [[b' abc ', b''],
+               [b'12##########45', b'MixedC@se'],
+               [b'12########## \t ##########45 \x00 ', b'UPPER']]
+        assert_(issubclass(R.dtype.type, np.bytes_))
+        assert_array_equal(R, tgt)
+        # Test special cases that should just return the input array,
+        # since replacements are not possible or do nothing.
+        S1 = self.A.replace(b'A very long byte string, longer than A', b'')
+        assert_array_equal(S1, self.A)
+        S2 = self.A.replace(b'', b'')
+        assert_array_equal(S2, self.A)
+        S3 = self.A.replace(b'3', b'3')
+        assert_array_equal(S3, self.A)
+        S4 = self.A.replace(b'3', b'', count=0)
+        assert_array_equal(S4, self.A)
+
+    def test_replace_count_and_size(self):
+        a = np.array(['0123456789' * i for i in range(4)]
+                     ).view(np.char.chararray)
+        r1 = a.replace('5', 'ABCDE')
+        assert r1.dtype.itemsize == (3*10 + 3*4) * 4
+        assert_array_equal(r1, np.array(['01234ABCDE6789' * i
+                                         for i in range(4)]))
+        r2 = a.replace('5', 'ABCDE', count=1)
+        assert r2.dtype.itemsize == (3*10 + 4) * 4
+        r3 = a.replace('5', 'ABCDE', count=0)
+        assert r3.dtype.itemsize == a.dtype.itemsize
+        assert_array_equal(r3, a)
+        # Negative values mean to replace all.
+        r4 = a.replace('5', 'ABCDE', count=-1)
+        assert r4.dtype.itemsize == (3*10 + 3*4) * 4
+        assert_array_equal(r4, r1)
+        # We can do count on an element-by-element basis.
+        r5 = a.replace('5', 'ABCDE', count=[-1, -1, -1, 1])
+        assert r5.dtype.itemsize == (3*10 + 4) * 4
+        assert_array_equal(r5, np.array(
+            ['01234ABCDE6789' * i for i in range(3)]
+            + ['01234ABCDE6789' + '0123456789' * 2]))
+
+    def test_replace_broadcasting(self):
+        a = np.array('0,0,0').view(np.char.chararray)
+        r1 = a.replace('0', '1', count=np.arange(3))
+        assert r1.dtype == a.dtype
+        assert_array_equal(r1, np.array(['0,0,0', '1,0,0', '1,1,0']))
+        r2 = a.replace('0', [['1'], ['2']], count=np.arange(1, 4))
+        assert_array_equal(r2, np.array([['1,0,0', '1,1,0', '1,1,1'],
+                                         ['2,0,0', '2,2,0', '2,2,2']]))
+        r3 = a.replace(['0', '0,0', '0,0,0'], 'X')
+        assert_array_equal(r3, np.array(['X,X,X', 'X,0', 'X']))
+
+    def test_rjust(self):
+        assert_(issubclass(self.A.rjust(10).dtype.type, np.bytes_))
+
+        C = self.A.rjust([10, 20])
+        assert_array_equal(np.char.str_len(C), [[10, 20], [10, 20], [12, 20]])
+
+        C = self.A.rjust(20, b'#')
+        assert_(np.all(C.startswith(b'#')))
+        assert_array_equal(C.endswith(b'#'),
+                           [[False, True], [False, False], [False, False]])
+
+        C = np.char.rjust(b'FOO', [[10, 20], [15, 8]])
+        tgt = [[b'       FOO', b'                 FOO'],
+               [b'            FOO', b'     FOO']]
+        assert_(issubclass(C.dtype.type, np.bytes_))
+        assert_array_equal(C, tgt)
+
+    def test_rpartition(self):
+        P = self.A.rpartition([b'3', b'M'])
+        tgt = [[(b'', b'', b' abc '), (b'', b'', b'')],
+               [(b'12', b'3', b'45'), (b'', b'M', b'ixedCase')],
+               [(b'123 \t ', b'3', b'45 \0 '), (b'', b'', b'UPPER')]]
+        assert_(issubclass(P.dtype.type, np.bytes_))
+        assert_array_equal(P, tgt)
+
+    def test_rsplit(self):
+        A = self.A.rsplit(b'3')
+        tgt = [[[b' abc '], [b'']],
+               [[b'12', b'45'], [b'MixedCase']],
+               [[b'12', b' \t ', b'45 \x00 '], [b'UPPER']]]
+        assert_(issubclass(A.dtype.type, np.object_))
+        assert_equal(A.tolist(), tgt)
+
+    def test_rstrip(self):
+        assert_(issubclass(self.A.rstrip().dtype.type, np.bytes_))
+
+        tgt = [[b' abc', b''],
+               [b'12345', b'MixedCase'],
+               [b'123 \t 345', b'UPPER']]
+        assert_array_equal(self.A.rstrip(), tgt)
+
+        tgt = [[b' abc ', b''],
+               [b'1234', b'MixedCase'],
+               [b'123 \t 345 \x00', b'UPP']
+               ]
+        assert_array_equal(self.A.rstrip([b'5', b'ER']), tgt)
+
+        tgt = [[' \u03a3', ''],
+               ['12345', 'MixedCase'],
+               ['123 \t 345', 'UPPER']]
+        assert_(issubclass(self.B.rstrip().dtype.type, np.str_))
+        assert_array_equal(self.B.rstrip(), tgt)
+
+    def test_strip(self):
+        tgt = [[b'abc', b''],
+               [b'12345', b'MixedCase'],
+               [b'123 \t 345', b'UPPER']]
+        assert_(issubclass(self.A.strip().dtype.type, np.bytes_))
+        assert_array_equal(self.A.strip(), tgt)
+
+        tgt = [[b' abc ', b''],
+               [b'234', b'ixedCas'],
+               [b'23 \t 345 \x00', b'UPP']]
+        assert_array_equal(self.A.strip([b'15', b'EReM']), tgt)
+
+        tgt = [['\u03a3', ''],
+               ['12345', 'MixedCase'],
+               ['123 \t 345', 'UPPER']]
+        assert_(issubclass(self.B.strip().dtype.type, np.str_))
+        assert_array_equal(self.B.strip(), tgt)
+
+    def test_split(self):
+        A = self.A.split(b'3')
+        tgt = [
+               [[b' abc '], [b'']],
+               [[b'12', b'45'], [b'MixedCase']],
+               [[b'12', b' \t ', b'45 \x00 '], [b'UPPER']]]
+        assert_(issubclass(A.dtype.type, np.object_))
+        assert_equal(A.tolist(), tgt)
+
+    def test_splitlines(self):
+        A = np.char.array(['abc\nfds\nwer']).splitlines()
+        assert_(issubclass(A.dtype.type, np.object_))
+        assert_(A.shape == (1,))
+        assert_(len(A[0]) == 3)
+
+    def test_swapcase(self):
+        tgt = [[b' ABC ', b''],
+               [b'12345', b'mIXEDcASE'],
+               [b'123 \t 345 \0 ', b'upper']]
+        assert_(issubclass(self.A.swapcase().dtype.type, np.bytes_))
+        assert_array_equal(self.A.swapcase(), tgt)
+
+        tgt = [[' \u03c3 ', ''],
+               ['12345', 'mIXEDcASE'],
+               ['123 \t 345 \0 ', 'upper']]
+        assert_(issubclass(self.B.swapcase().dtype.type, np.str_))
+        assert_array_equal(self.B.swapcase(), tgt)
+
+    def test_title(self):
+        tgt = [[b' Abc ', b''],
+               [b'12345', b'Mixedcase'],
+               [b'123 \t 345 \0 ', b'Upper']]
+        assert_(issubclass(self.A.title().dtype.type, np.bytes_))
+        assert_array_equal(self.A.title(), tgt)
+
+        tgt = [[' \u03a3 ', ''],
+               ['12345', 'Mixedcase'],
+               ['123 \t 345 \0 ', 'Upper']]
+        assert_(issubclass(self.B.title().dtype.type, np.str_))
+        assert_array_equal(self.B.title(), tgt)
+
+    def test_upper(self):
+        tgt = [[b' ABC ', b''],
+               [b'12345', b'MIXEDCASE'],
+               [b'123 \t 345 \0 ', b'UPPER']]
+        assert_(issubclass(self.A.upper().dtype.type, np.bytes_))
+        assert_array_equal(self.A.upper(), tgt)
+
+        tgt = [[' \u03a3 ', ''],
+               ['12345', 'MIXEDCASE'],
+               ['123 \t 345 \0 ', 'UPPER']]
+        assert_(issubclass(self.B.upper().dtype.type, np.str_))
+        assert_array_equal(self.B.upper(), tgt)
+
+    def test_isnumeric(self):
+
+        def fail():
+            self.A.isnumeric()
+
+        assert_raises(TypeError, fail)
+        assert_(issubclass(self.B.isnumeric().dtype.type, np.bool))
+        assert_array_equal(self.B.isnumeric(), [
+                [False, False], [True, False], [False, False]])
+
+    def test_isdecimal(self):
+
+        def fail():
+            self.A.isdecimal()
+
+        assert_raises(TypeError, fail)
+        assert_(issubclass(self.B.isdecimal().dtype.type, np.bool))
+        assert_array_equal(self.B.isdecimal(), [
+                [False, False], [True, False], [False, False]])
+
+
+class TestOperations:
+    def setup_method(self):
+        self.A = np.array([['abc', '123'],
+                           ['789', 'xyz']]).view(np.char.chararray)
+        self.B = np.array([['efg', '456'],
+                           ['051', 'tuv']]).view(np.char.chararray)
+
+    def test_add(self):
+        AB = np.array([['abcefg', '123456'],
+                       ['789051', 'xyztuv']]).view(np.char.chararray)
+        assert_array_equal(AB, (self.A + self.B))
+        assert_(len((self.A + self.B)[0][0]) == 6)
+
+    def test_radd(self):
+        QA = np.array([['qabc', 'q123'],
+                       ['q789', 'qxyz']]).view(np.char.chararray)
+        assert_array_equal(QA, ('q' + self.A))
+
+    def test_mul(self):
+        A = self.A
+        for r in (2, 3, 5, 7, 197):
+            Ar = np.array([[A[0, 0]*r, A[0, 1]*r],
+                           [A[1, 0]*r, A[1, 1]*r]]).view(np.char.chararray)
+
+            assert_array_equal(Ar, (self.A * r))
+
+        for ob in [object(), 'qrs']:
+            with assert_raises_regex(ValueError,
+                                     'Can only multiply by integers'):
+                A*ob
+
+    def test_rmul(self):
+        A = self.A
+        for r in (2, 3, 5, 7, 197):
+            Ar = np.array([[A[0, 0]*r, A[0, 1]*r],
+                           [A[1, 0]*r, A[1, 1]*r]]).view(np.char.chararray)
+            assert_array_equal(Ar, (r * self.A))
+
+        for ob in [object(), 'qrs']:
+            with assert_raises_regex(ValueError,
+                                     'Can only multiply by integers'):
+                ob * A
+
+    def test_mod(self):
+        """Ticket #856"""
+        F = np.array([['%d', '%f'], ['%s', '%r']]).view(np.char.chararray)
+        C = np.array([[3, 7], [19, 1]], dtype=np.int64)
+        FC = np.array([['3', '7.000000'],
+                       ['19', 'np.int64(1)']]).view(np.char.chararray)
+        assert_array_equal(FC, F % C)
+
+        A = np.array([['%.3f', '%d'], ['%s', '%r']]).view(np.char.chararray)
+        A1 = np.array([['1.000', '1'],
+                       ['1', repr(np.array(1)[()])]]).view(np.char.chararray)
+        assert_array_equal(A1, (A % 1))
+
+        A2 = np.array([['1.000', '2'],
+                       ['3', repr(np.array(4)[()])]]).view(np.char.chararray)
+        assert_array_equal(A2, (A % [[1, 2], [3, 4]]))
+
+    def test_rmod(self):
+        assert_(("%s" % self.A) == str(self.A))
+        assert_(("%r" % self.A) == repr(self.A))
+
+        for ob in [42, object()]:
+            with assert_raises_regex(
+                    TypeError, "unsupported operand type.* and 'chararray'"):
+                ob % self.A
+
+    def test_slice(self):
+        """Regression test for https://github.com/numpy/numpy/issues/5982"""
+
+        arr = np.array([['abc ', 'def '], ['geh ', 'ijk ']],
+                       dtype='S4').view(np.char.chararray)
+        sl1 = arr[:]
+        assert_array_equal(sl1, arr)
+        assert_(sl1.base is arr)
+        assert_(sl1.base.base is arr.base)
+
+        sl2 = arr[:, :]
+        assert_array_equal(sl2, arr)
+        assert_(sl2.base is arr)
+        assert_(sl2.base.base is arr.base)
+
+        assert_(arr[0, 0] == b'abc')
+
+    @pytest.mark.parametrize('data', [['plate', '   ', 'shrimp'],
+                                      [b'retro', b'  ', b'encabulator']])
+    def test_getitem_length_zero_item(self, data):
+        # Regression test for gh-26375.
+        a = np.char.array(data)
+        # a.dtype.type() will be an empty string or bytes instance.
+        # The equality test will fail if a[1] has the wrong type
+        # or does not have length 0.
+        assert_equal(a[1], a.dtype.type())
+
+
+class TestMethodsEmptyArray:
+    def setup_method(self):
+        self.U = np.array([], dtype='U')
+        self.S = np.array([], dtype='S')
+
+    def test_encode(self):
+        res = np.char.encode(self.U)
+        assert_array_equal(res, [])
+        assert_(res.dtype.char == 'S')
+
+    def test_decode(self):
+        res = np.char.decode(self.S)
+        assert_array_equal(res, [])
+        assert_(res.dtype.char == 'U')
+
+    def test_decode_with_reshape(self):
+        res = np.char.decode(self.S.reshape((1, 0, 1)))
+        assert_(res.shape == (1, 0, 1))
+
+
+class TestMethodsScalarValues:
+    def test_mod(self):
+        A = np.array([[' abc ', ''],
+                      ['12345', 'MixedCase'],
+                      ['123 \t 345 \0 ', 'UPPER']], dtype='S')
+        tgt = [[b'123 abc ', b'123'],
+               [b'12312345', b'123MixedCase'],
+               [b'123123 \t 345 \0 ', b'123UPPER']]
+        assert_array_equal(np.char.mod(b"123%s", A), tgt)
+
+    def test_decode(self):
+        bytestring = b'\x81\xc1\x81\xc1\x81\xc1'
+        assert_equal(np.char.decode(bytestring, encoding='cp037'),
+                     'aAaAaA')
+
+    def test_encode(self):
+        unicode = 'aAaAaA'
+        assert_equal(np.char.encode(unicode, encoding='cp037'),
+                     b'\x81\xc1\x81\xc1\x81\xc1')
+
+    def test_expandtabs(self):
+        s = "\tone level of indentation\n\t\ttwo levels of indentation"
+        assert_equal(
+            np.char.expandtabs(s, tabsize=2),
+            "  one level of indentation\n    two levels of indentation"
+        )
+
+    def test_join(self):
+        seps = np.array(['-', '_'])
+        assert_array_equal(np.char.join(seps, 'hello'),
+                           ['h-e-l-l-o', 'h_e_l_l_o'])
+
+    def test_partition(self):
+        assert_equal(np.char.partition('This string', ' '),
+                     ['This', ' ', 'string'])
+
+    def test_rpartition(self):
+        assert_equal(np.char.rpartition('This string here', ' '),
+                     ['This string', ' ', 'here'])
+
+    def test_replace(self):
+        assert_equal(np.char.replace('Python is good', 'good', 'great'),
+                     'Python is great')
+
+
+def test_empty_indexing():
+    """Regression test for ticket 1948."""
+    # Check that indexing a chararray with an empty list/array returns an
+    # empty chararray instead of a chararray with a single empty string in it.
+    s = np.char.chararray((4,))
+    assert_(s[[]].size == 0)

mantis_evalkit/lib/python3.10/site-packages/numpy/_core/tests/test_dtype.py

@@ -0,0 +1,1963 @@
+import sys
+import operator
+import pytest
+import ctypes
+import gc
+import types
+from typing import Any
+import pickle
+
+import numpy as np
+import numpy.dtypes
+from numpy._core._rational_tests import rational
+from numpy._core._multiarray_tests import create_custom_field_dtype
+from numpy.testing import (
+    assert_, assert_equal, assert_array_equal, assert_raises, HAS_REFCOUNT,
+    IS_PYSTON)
+from itertools import permutations
+import random
+
+import hypothesis
+from hypothesis.extra import numpy as hynp
+
+
+
+def assert_dtype_equal(a, b):
+    assert_equal(a, b)
+    assert_equal(hash(a), hash(b),
+                 "two equivalent types do not hash to the same value !")
+
+def assert_dtype_not_equal(a, b):
+    assert_(a != b)
+    assert_(hash(a) != hash(b),
+            "two different types hash to the same value !")
+
+class TestBuiltin:
+    @pytest.mark.parametrize('t', [int, float, complex, np.int32, str, object])
+    def test_run(self, t):
+        """Only test hash runs at all."""
+        dt = np.dtype(t)
+        hash(dt)
+
+    @pytest.mark.parametrize('t', [int, float])
+    def test_dtype(self, t):
+        # Make sure equivalent byte order char hash the same (e.g. < and = on
+        # little endian)
+        dt = np.dtype(t)
+        dt2 = dt.newbyteorder("<")
+        dt3 = dt.newbyteorder(">")
+        if dt == dt2:
+            assert_(dt.byteorder != dt2.byteorder, "bogus test")
+            assert_dtype_equal(dt, dt2)
+        else:
+            assert_(dt.byteorder != dt3.byteorder, "bogus test")
+            assert_dtype_equal(dt, dt3)
+
+    def test_equivalent_dtype_hashing(self):
+        # Make sure equivalent dtypes with different type num hash equal
+        uintp = np.dtype(np.uintp)
+        if uintp.itemsize == 4:
+            left = uintp
+            right = np.dtype(np.uint32)
+        else:
+            left = uintp
+            right = np.dtype(np.ulonglong)
+        assert_(left == right)
+        assert_(hash(left) == hash(right))
+
+    def test_invalid_types(self):
+        # Make sure invalid type strings raise an error
+
+        assert_raises(TypeError, np.dtype, 'O3')
+        assert_raises(TypeError, np.dtype, 'O5')
+        assert_raises(TypeError, np.dtype, 'O7')
+        assert_raises(TypeError, np.dtype, 'b3')
+        assert_raises(TypeError, np.dtype, 'h4')
+        assert_raises(TypeError, np.dtype, 'I5')
+        assert_raises(TypeError, np.dtype, 'e3')
+        assert_raises(TypeError, np.dtype, 'f5')
+
+        if np.dtype('g').itemsize == 8 or np.dtype('g').itemsize == 16:
+            assert_raises(TypeError, np.dtype, 'g12')
+        elif np.dtype('g').itemsize == 12:
+            assert_raises(TypeError, np.dtype, 'g16')
+
+        if np.dtype('l').itemsize == 8:
+            assert_raises(TypeError, np.dtype, 'l4')
+            assert_raises(TypeError, np.dtype, 'L4')
+        else:
+            assert_raises(TypeError, np.dtype, 'l8')
+            assert_raises(TypeError, np.dtype, 'L8')
+
+        if np.dtype('q').itemsize == 8:
+            assert_raises(TypeError, np.dtype, 'q4')
+            assert_raises(TypeError, np.dtype, 'Q4')
+        else:
+            assert_raises(TypeError, np.dtype, 'q8')
+            assert_raises(TypeError, np.dtype, 'Q8')
+
+        # Make sure negative-sized dtype raises an error
+        assert_raises(TypeError, np.dtype, 'S-1')
+        assert_raises(TypeError, np.dtype, 'U-1')
+        assert_raises(TypeError, np.dtype, 'V-1')
+
+    def test_richcompare_invalid_dtype_equality(self):
+        # Make sure objects that cannot be converted to valid
+        # dtypes results in False/True when compared to valid dtypes.
+        # Here 7 cannot be converted to dtype. No exceptions should be raised
+
+        assert not np.dtype(np.int32) == 7, "dtype richcompare failed for =="
+        assert np.dtype(np.int32) != 7, "dtype richcompare failed for !="
+
+    @pytest.mark.parametrize(
+        'operation',
+        [operator.le, operator.lt, operator.ge, operator.gt])
+    def test_richcompare_invalid_dtype_comparison(self, operation):
+        # Make sure TypeError is raised for comparison operators
+        # for invalid dtypes. Here 7 is an invalid dtype.
+
+        with pytest.raises(TypeError):
+            operation(np.dtype(np.int32), 7)
+
+    @pytest.mark.parametrize("dtype",
+             ['Bool', 'Bytes0', 'Complex32', 'Complex64',
+              'Datetime64', 'Float16', 'Float32', 'Float64',
+              'Int8', 'Int16', 'Int32', 'Int64',
+              'Object0', 'Str0', 'Timedelta64',
+              'UInt8', 'UInt16', 'Uint32', 'UInt32',
+              'Uint64', 'UInt64', 'Void0',
+              "Float128", "Complex128"])
+    def test_numeric_style_types_are_invalid(self, dtype):
+        with assert_raises(TypeError):
+            np.dtype(dtype)
+
+    def test_expired_dtypes_with_bad_bytesize(self):
+        match: str = r".*removed in NumPy 2.0.*"
+        with pytest.raises(TypeError, match=match):
+            np.dtype("int0")
+        with pytest.raises(TypeError, match=match):
+            np.dtype("uint0")
+        with pytest.raises(TypeError, match=match):
+            np.dtype("bool8")
+        with pytest.raises(TypeError, match=match):
+            np.dtype("bytes0")
+        with pytest.raises(TypeError, match=match):
+            np.dtype("str0")
+        with pytest.raises(TypeError, match=match):
+            np.dtype("object0")
+        with pytest.raises(TypeError, match=match):
+            np.dtype("void0")
+
+    @pytest.mark.parametrize(
+        'value',
+        ['m8', 'M8', 'datetime64', 'timedelta64',
+         'i4, (2,3)f8, f4', 'S3, 3u8, (3,4)S10',
+         '>f', '<f', '=f', '|f',
+        ])
+    def test_dtype_bytes_str_equivalence(self, value):
+        bytes_value = value.encode('ascii')
+        from_bytes = np.dtype(bytes_value)
+        from_str = np.dtype(value)
+        assert_dtype_equal(from_bytes, from_str)
+
+    def test_dtype_from_bytes(self):
+        # Empty bytes object
+        assert_raises(TypeError, np.dtype, b'')
+        # Byte order indicator, but no type
+        assert_raises(TypeError, np.dtype, b'|')
+
+        # Single character with ordinal < NPY_NTYPES_LEGACY returns
+        # type by index into _builtin_descrs
+        assert_dtype_equal(np.dtype(bytes([0])), np.dtype('bool'))
+        assert_dtype_equal(np.dtype(bytes([17])), np.dtype(object))
+
+        # Single character where value is a valid type code
+        assert_dtype_equal(np.dtype(b'f'), np.dtype('float32'))
+
+        # Bytes with non-ascii values raise errors
+        assert_raises(TypeError, np.dtype, b'\xff')
+        assert_raises(TypeError, np.dtype, b's\xff')
+
+    def test_bad_param(self):
+        # Can't give a size that's too small
+        assert_raises(ValueError, np.dtype,
+                        {'names':['f0', 'f1'],
+                         'formats':['i4', 'i1'],
+                         'offsets':[0, 4],
+                         'itemsize':4})
+        # If alignment is enabled, the alignment (4) must divide the itemsize
+        assert_raises(ValueError, np.dtype,
+                        {'names':['f0', 'f1'],
+                         'formats':['i4', 'i1'],
+                         'offsets':[0, 4],
+                         'itemsize':9}, align=True)
+        # If alignment is enabled, the individual fields must be aligned
+        assert_raises(ValueError, np.dtype,
+                        {'names':['f0', 'f1'],
+                         'formats':['i1', 'f4'],
+                         'offsets':[0, 2]}, align=True)
+
+    def test_field_order_equality(self):
+        x = np.dtype({'names': ['A', 'B'],
+                      'formats': ['i4', 'f4'],
+                      'offsets': [0, 4]})
+        y = np.dtype({'names': ['B', 'A'],
+                      'formats': ['i4', 'f4'],
+                      'offsets': [4, 0]})
+        assert_equal(x == y, False)
+        # This is an safe cast (not equiv) due to the different names:
+        assert np.can_cast(x, y, casting="safe")
+
+    @pytest.mark.parametrize(
+        ["type_char", "char_size", "scalar_type"],
+        [["U", 4, np.str_],
+         ["S", 1, np.bytes_]])
+    def test_create_string_dtypes_directly(
+            self, type_char, char_size, scalar_type):
+        dtype_class = type(np.dtype(type_char))
+
+        dtype = dtype_class(8)
+        assert dtype.type is scalar_type
+        assert dtype.itemsize == 8*char_size
+
+    def test_create_invalid_string_errors(self):
+        one_too_big = np.iinfo(np.intc).max + 1
+        with pytest.raises(TypeError):
+            type(np.dtype("U"))(one_too_big // 4)
+
+        with pytest.raises(TypeError):
+            # Code coverage for very large numbers:
+            type(np.dtype("U"))(np.iinfo(np.intp).max // 4 + 1)
+
+        if one_too_big < sys.maxsize:
+            with pytest.raises(TypeError):
+                type(np.dtype("S"))(one_too_big)
+
+        with pytest.raises(ValueError):
+            type(np.dtype("U"))(-1)
+
+        # OverflowError on 32 bit
+        with pytest.raises((TypeError, OverflowError)):
+            # see gh-26556
+            type(np.dtype("S"))(2**61)
+
+        with pytest.raises(TypeError):
+            np.dtype("S1234hello")
+
+    def test_leading_zero_parsing(self):
+        dt1 = np.dtype('S010')
+        dt2 = np.dtype('S10')
+
+        assert dt1 == dt2
+        assert repr(dt1) == "dtype('S10')"
+        assert dt1.itemsize == 10
+
+
+class TestRecord:
+    def test_equivalent_record(self):
+        """Test whether equivalent record dtypes hash the same."""
+        a = np.dtype([('yo', int)])
+        b = np.dtype([('yo', int)])
+        assert_dtype_equal(a, b)
+
+    def test_different_names(self):
+        # In theory, they may hash the same (collision) ?
+        a = np.dtype([('yo', int)])
+        b = np.dtype([('ye', int)])
+        assert_dtype_not_equal(a, b)
+
+    def test_different_titles(self):
+        # In theory, they may hash the same (collision) ?
+        a = np.dtype({'names': ['r', 'b'],
+                      'formats': ['u1', 'u1'],
+                      'titles': ['Red pixel', 'Blue pixel']})
+        b = np.dtype({'names': ['r', 'b'],
+                      'formats': ['u1', 'u1'],
+                      'titles': ['RRed pixel', 'Blue pixel']})
+        assert_dtype_not_equal(a, b)
+
+    @pytest.mark.skipif(not HAS_REFCOUNT, reason="Python lacks refcounts")
+    def test_refcount_dictionary_setting(self):
+        names = ["name1"]
+        formats = ["f8"]
+        titles = ["t1"]
+        offsets = [0]
+        d = dict(names=names, formats=formats, titles=titles, offsets=offsets)
+        refcounts = {k: sys.getrefcount(i) for k, i in d.items()}
+        np.dtype(d)
+        refcounts_new = {k: sys.getrefcount(i) for k, i in d.items()}
+        assert refcounts == refcounts_new
+
+    def test_mutate(self):
+        # Mutating a dtype should reset the cached hash value.
+        # NOTE: Mutating should be deprecated, but new API added to replace it.
+        a = np.dtype([('yo', int)])
+        b = np.dtype([('yo', int)])
+        c = np.dtype([('ye', int)])
+        assert_dtype_equal(a, b)
+        assert_dtype_not_equal(a, c)
+        a.names = ['ye']
+        assert_dtype_equal(a, c)
+        assert_dtype_not_equal(a, b)
+        state = b.__reduce__()[2]
+        a.__setstate__(state)
+        assert_dtype_equal(a, b)
+        assert_dtype_not_equal(a, c)
+
+    def test_init_simple_structured(self):
+        dt1 = np.dtype("i, i")
+        assert dt1.names == ("f0", "f1")
+
+        dt2 = np.dtype("i,")
+        assert dt2.names == ("f0",)
+
+    def test_mutate_error(self):
+        # NOTE: Mutating should be deprecated, but new API added to replace it.
+        a = np.dtype("i,i")
+
+        with pytest.raises(ValueError, match="must replace all names at once"):
+            a.names = ["f0"]
+
+        with pytest.raises(ValueError, match=".*and not string"):
+            a.names = ["f0", b"not a unicode name"]
+
+    def test_not_lists(self):
+        """Test if an appropriate exception is raised when passing bad values to
+        the dtype constructor.
+        """
+        assert_raises(TypeError, np.dtype,
+                      dict(names={'A', 'B'}, formats=['f8', 'i4']))
+        assert_raises(TypeError, np.dtype,
+                      dict(names=['A', 'B'], formats={'f8', 'i4'}))
+
+    def test_aligned_size(self):
+        # Check that structured dtypes get padded to an aligned size
+        dt = np.dtype('i4, i1', align=True)
+        assert_equal(dt.itemsize, 8)
+        dt = np.dtype([('f0', 'i4'), ('f1', 'i1')], align=True)
+        assert_equal(dt.itemsize, 8)
+        dt = np.dtype({'names':['f0', 'f1'],
+                       'formats':['i4', 'u1'],
+                       'offsets':[0, 4]}, align=True)
+        assert_equal(dt.itemsize, 8)
+        dt = np.dtype({'f0': ('i4', 0), 'f1':('u1', 4)}, align=True)
+        assert_equal(dt.itemsize, 8)
+        # Nesting should preserve that alignment
+        dt1 = np.dtype([('f0', 'i4'),
+                       ('f1', [('f1', 'i1'), ('f2', 'i4'), ('f3', 'i1')]),
+                       ('f2', 'i1')], align=True)
+        assert_equal(dt1.itemsize, 20)
+        dt2 = np.dtype({'names':['f0', 'f1', 'f2'],
+                       'formats':['i4',
+                                  [('f1', 'i1'), ('f2', 'i4'), ('f3', 'i1')],
+                                  'i1'],
+                       'offsets':[0, 4, 16]}, align=True)
+        assert_equal(dt2.itemsize, 20)
+        dt3 = np.dtype({'f0': ('i4', 0),
+                       'f1': ([('f1', 'i1'), ('f2', 'i4'), ('f3', 'i1')], 4),
+                       'f2': ('i1', 16)}, align=True)
+        assert_equal(dt3.itemsize, 20)
+        assert_equal(dt1, dt2)
+        assert_equal(dt2, dt3)
+        # Nesting should preserve packing
+        dt1 = np.dtype([('f0', 'i4'),
+                       ('f1', [('f1', 'i1'), ('f2', 'i4'), ('f3', 'i1')]),
+                       ('f2', 'i1')], align=False)
+        assert_equal(dt1.itemsize, 11)
+        dt2 = np.dtype({'names':['f0', 'f1', 'f2'],
+                       'formats':['i4',
+                                  [('f1', 'i1'), ('f2', 'i4'), ('f3', 'i1')],
+                                  'i1'],
+                       'offsets':[0, 4, 10]}, align=False)
+        assert_equal(dt2.itemsize, 11)
+        dt3 = np.dtype({'f0': ('i4', 0),
+                       'f1': ([('f1', 'i1'), ('f2', 'i4'), ('f3', 'i1')], 4),
+                       'f2': ('i1', 10)}, align=False)
+        assert_equal(dt3.itemsize, 11)
+        assert_equal(dt1, dt2)
+        assert_equal(dt2, dt3)
+        # Array of subtype should preserve alignment
+        dt1 = np.dtype([('a', '|i1'),
+                        ('b', [('f0', '<i2'),
+                        ('f1', '<f4')], 2)], align=True)
+        assert_equal(dt1.descr, [('a', '|i1'), ('', '|V3'),
+                                 ('b', [('f0', '<i2'), ('', '|V2'),
+                                 ('f1', '<f4')], (2,))])
+
+    def test_empty_struct_alignment(self):
+        # Empty dtypes should have an alignment of 1
+        dt = np.dtype([], align=True)
+        assert_equal(dt.alignment, 1)
+        dt = np.dtype([('f0', [])], align=True)
+        assert_equal(dt.alignment, 1)
+        dt = np.dtype({'names': [],
+                       'formats': [],
+                       'offsets': []}, align=True)
+        assert_equal(dt.alignment, 1)
+        dt = np.dtype({'names': ['f0'],
+                       'formats': [[]],
+                       'offsets': [0]}, align=True)
+        assert_equal(dt.alignment, 1)
+
+    def test_union_struct(self):
+        # Should be able to create union dtypes
+        dt = np.dtype({'names':['f0', 'f1', 'f2'], 'formats':['<u4', '<u2', '<u2'],
+                        'offsets':[0, 0, 2]}, align=True)
+        assert_equal(dt.itemsize, 4)
+        a = np.array([3], dtype='<u4').view(dt)
+        a['f1'] = 10
+        a['f2'] = 36
+        assert_equal(a['f0'], 10 + 36*256*256)
+        # Should be able to specify fields out of order
+        dt = np.dtype({'names':['f0', 'f1', 'f2'], 'formats':['<u4', '<u2', '<u2'],
+                        'offsets':[4, 0, 2]}, align=True)
+        assert_equal(dt.itemsize, 8)
+        # field name should not matter: assignment is by position
+        dt2 = np.dtype({'names':['f2', 'f0', 'f1'],
+                        'formats':['<u4', '<u2', '<u2'],
+                        'offsets':[4, 0, 2]}, align=True)
+        vals = [(0, 1, 2), (3, 2**15-1, 4)]
+        vals2 = [(0, 1, 2), (3, 2**15-1, 4)]
+        a = np.array(vals, dt)
+        b = np.array(vals2, dt2)
+        assert_equal(a.astype(dt2), b)
+        assert_equal(b.astype(dt), a)
+        assert_equal(a.view(dt2), b)
+        assert_equal(b.view(dt), a)
+        # Should not be able to overlap objects with other types
+        assert_raises(TypeError, np.dtype,
+                {'names':['f0', 'f1'],
+                 'formats':['O', 'i1'],
+                 'offsets':[0, 2]})
+        assert_raises(TypeError, np.dtype,
+                {'names':['f0', 'f1'],
+                 'formats':['i4', 'O'],
+                 'offsets':[0, 3]})
+        assert_raises(TypeError, np.dtype,
+                {'names':['f0', 'f1'],
+                 'formats':[[('a', 'O')], 'i1'],
+                 'offsets':[0, 2]})
+        assert_raises(TypeError, np.dtype,
+                {'names':['f0', 'f1'],
+                 'formats':['i4', [('a', 'O')]],
+                 'offsets':[0, 3]})
+        # Out of order should still be ok, however
+        dt = np.dtype({'names':['f0', 'f1'],
+                       'formats':['i1', 'O'],
+                       'offsets':[np.dtype('intp').itemsize, 0]})
+
+    @pytest.mark.parametrize(["obj", "dtype", "expected"],
+        [([], ("2f4"), np.empty((0, 2), dtype="f4")),
+         (3, "(3,)f4", [3, 3, 3]),
+         (np.float64(2), "(2,)f4", [2, 2]),
+         ([((0, 1), (1, 2)), ((2,),)], '(2,2)f4', None),
+         (["1", "2"], "2i", None)])
+    def test_subarray_list(self, obj, dtype, expected):
+        dtype = np.dtype(dtype)
+        res = np.array(obj, dtype=dtype)
+
+        if expected is None:
+            # iterate the 1-d list to fill the array
+            expected = np.empty(len(obj), dtype=dtype)
+            for i in range(len(expected)):
+                expected[i] = obj[i]
+
+        assert_array_equal(res, expected)
+
+    def test_parenthesized_single_number(self):
+        with pytest.raises(TypeError, match="not understood"):
+            np.dtype("(2)f4")
+
+        # Deprecation also tested in
+        # test_deprecations.py::TestDeprecatedDTypeParenthesizedRepeatCount
+        # Left here to allow easy conversion to an exception check.
+        with pytest.warns(DeprecationWarning,
+                          match="parenthesized single number"):
+            np.dtype("(2)f4,")
+
+    def test_comma_datetime(self):
+        dt = np.dtype('M8[D],datetime64[Y],i8')
+        assert_equal(dt, np.dtype([('f0', 'M8[D]'),
+                                   ('f1', 'datetime64[Y]'),
+                                   ('f2', 'i8')]))
+
+    def test_from_dictproxy(self):
+        # Tests for PR #5920
+        dt = np.dtype({'names': ['a', 'b'], 'formats': ['i4', 'f4']})
+        assert_dtype_equal(dt, np.dtype(dt.fields))
+        dt2 = np.dtype((np.void, dt.fields))
+        assert_equal(dt2.fields, dt.fields)
+
+    def test_from_dict_with_zero_width_field(self):
+        # Regression test for #6430 / #2196
+        dt = np.dtype([('val1', np.float32, (0,)), ('val2', int)])
+        dt2 = np.dtype({'names': ['val1', 'val2'],
+                        'formats': [(np.float32, (0,)), int]})
+
+        assert_dtype_equal(dt, dt2)
+        assert_equal(dt.fields['val1'][0].itemsize, 0)
+        assert_equal(dt.itemsize, dt.fields['val2'][0].itemsize)
+
+    def test_bool_commastring(self):
+        d = np.dtype('?,?,?')  # raises?
+        assert_equal(len(d.names), 3)
+        for n in d.names:
+            assert_equal(d.fields[n][0], np.dtype('?'))
+
+    def test_nonint_offsets(self):
+        # gh-8059
+        def make_dtype(off):
+            return np.dtype({'names': ['A'], 'formats': ['i4'],
+                             'offsets': [off]})
+
+        assert_raises(TypeError, make_dtype, 'ASD')
+        assert_raises(OverflowError, make_dtype, 2**70)
+        assert_raises(TypeError, make_dtype, 2.3)
+        assert_raises(ValueError, make_dtype, -10)
+
+        # no errors here:
+        dt = make_dtype(np.uint32(0))
+        np.zeros(1, dtype=dt)[0].item()
+
+    def test_fields_by_index(self):
+        dt = np.dtype([('a', np.int8), ('b', np.float32, 3)])
+        assert_dtype_equal(dt[0], np.dtype(np.int8))
+        assert_dtype_equal(dt[1], np.dtype((np.float32, 3)))
+        assert_dtype_equal(dt[-1], dt[1])
+        assert_dtype_equal(dt[-2], dt[0])
+        assert_raises(IndexError, lambda: dt[-3])
+
+        assert_raises(TypeError, operator.getitem, dt, 3.0)
+
+        assert_equal(dt[1], dt[np.int8(1)])
+
+    @pytest.mark.parametrize('align_flag',[False, True])
+    def test_multifield_index(self, align_flag):
+        # indexing with a list produces subfields
+        # the align flag should be preserved
+        dt = np.dtype([
+            (('title', 'col1'), '<U20'), ('A', '<f8'), ('B', '<f8')
+        ], align=align_flag)
+
+        dt_sub = dt[['B', 'col1']]
+        assert_equal(
+            dt_sub,
+            np.dtype({
+                'names': ['B', 'col1'],
+                'formats': ['<f8', '<U20'],
+                'offsets': [88, 0],
+                'titles': [None, 'title'],
+                'itemsize': 96
+            })
+        )
+        assert_equal(dt_sub.isalignedstruct, align_flag)
+
+        dt_sub = dt[['B']]
+        assert_equal(
+            dt_sub,
+            np.dtype({
+                'names': ['B'],
+                'formats': ['<f8'],
+                'offsets': [88],
+                'itemsize': 96
+            })
+        )
+        assert_equal(dt_sub.isalignedstruct, align_flag)
+
+        dt_sub = dt[[]]
+        assert_equal(
+            dt_sub,
+            np.dtype({
+                'names': [],
+                'formats': [],
+                'offsets': [],
+                'itemsize': 96
+            })
+        )
+        assert_equal(dt_sub.isalignedstruct, align_flag)
+
+        assert_raises(TypeError, operator.getitem, dt, ())
+        assert_raises(TypeError, operator.getitem, dt, [1, 2, 3])
+        assert_raises(TypeError, operator.getitem, dt, ['col1', 2])
+        assert_raises(KeyError, operator.getitem, dt, ['fake'])
+        assert_raises(KeyError, operator.getitem, dt, ['title'])
+        assert_raises(ValueError, operator.getitem, dt, ['col1', 'col1'])
+
+    def test_partial_dict(self):
+        # 'names' is missing
+        assert_raises(ValueError, np.dtype,
+                {'formats': ['i4', 'i4'], 'f0': ('i4', 0), 'f1':('i4', 4)})
+
+    def test_fieldless_views(self):
+        a = np.zeros(2, dtype={'names':[], 'formats':[], 'offsets':[],
+                               'itemsize':8})
+        assert_raises(ValueError, a.view, np.dtype([]))
+
+        d = np.dtype((np.dtype([]), 10))
+        assert_equal(d.shape, (10,))
+        assert_equal(d.itemsize, 0)
+        assert_equal(d.base, np.dtype([]))
+
+        arr = np.fromiter((() for i in range(10)), [])
+        assert_equal(arr.dtype, np.dtype([]))
+        assert_raises(ValueError, np.frombuffer, b'', dtype=[])
+        assert_equal(np.frombuffer(b'', dtype=[], count=2),
+                     np.empty(2, dtype=[]))
+
+        assert_raises(ValueError, np.dtype, ([], 'f8'))
+        assert_raises(ValueError, np.zeros(1, dtype='i4').view, [])
+
+        assert_equal(np.zeros(2, dtype=[]) == np.zeros(2, dtype=[]),
+                     np.ones(2, dtype=bool))
+
+        assert_equal(np.zeros((1, 2), dtype=[]) == a,
+                     np.ones((1, 2), dtype=bool))
+
+    def test_nonstructured_with_object(self):
+        # See gh-23277, the dtype here thinks it contain objects, if the
+        # assert about that fails, the test becomes meaningless (which is OK)
+        arr = np.recarray((0,), dtype="O")
+        assert arr.dtype.names is None  # no fields
+        assert arr.dtype.hasobject  # but claims to contain objects
+        del arr  # the deletion failed previously.
+
+
+class TestSubarray:
+    def test_single_subarray(self):
+        a = np.dtype((int, (2)))
+        b = np.dtype((int, (2,)))
+        assert_dtype_equal(a, b)
+
+        assert_equal(type(a.subdtype[1]), tuple)
+        assert_equal(type(b.subdtype[1]), tuple)
+
+    def test_equivalent_record(self):
+        """Test whether equivalent subarray dtypes hash the same."""
+        a = np.dtype((int, (2, 3)))
+        b = np.dtype((int, (2, 3)))
+        assert_dtype_equal(a, b)
+
+    def test_nonequivalent_record(self):
+        """Test whether different subarray dtypes hash differently."""
+        a = np.dtype((int, (2, 3)))
+        b = np.dtype((int, (3, 2)))
+        assert_dtype_not_equal(a, b)
+
+        a = np.dtype((int, (2, 3)))
+        b = np.dtype((int, (2, 2)))
+        assert_dtype_not_equal(a, b)
+
+        a = np.dtype((int, (1, 2, 3)))
+        b = np.dtype((int, (1, 2)))
+        assert_dtype_not_equal(a, b)
+
+    def test_shape_equal(self):
+        """Test some data types that are equal"""
+        assert_dtype_equal(np.dtype('f8'), np.dtype(('f8', tuple())))
+        assert_dtype_equal(np.dtype('(1,)f8'), np.dtype(('f8', 1)))
+        assert np.dtype(('f8', 1)).shape == (1,)
+        assert_dtype_equal(np.dtype((int, 2)), np.dtype((int, (2,))))
+        assert_dtype_equal(np.dtype(('<f4', (3, 2))), np.dtype(('<f4', (3, 2))))
+        d = ([('a', 'f4', (1, 2)), ('b', 'f8', (3, 1))], (3, 2))
+        assert_dtype_equal(np.dtype(d), np.dtype(d))
+
+    def test_shape_simple(self):
+        """Test some simple cases that shouldn't be equal"""
+        assert_dtype_not_equal(np.dtype('f8'), np.dtype(('f8', (1,))))
+        assert_dtype_not_equal(np.dtype(('f8', (1,))), np.dtype(('f8', (1, 1))))
+        assert_dtype_not_equal(np.dtype(('f4', (3, 2))), np.dtype(('f4', (2, 3))))
+
+    def test_shape_monster(self):
+        """Test some more complicated cases that shouldn't be equal"""
+        assert_dtype_not_equal(
+            np.dtype(([('a', 'f4', (2, 1)), ('b', 'f8', (1, 3))], (2, 2))),
+            np.dtype(([('a', 'f4', (1, 2)), ('b', 'f8', (1, 3))], (2, 2))))
+        assert_dtype_not_equal(
+            np.dtype(([('a', 'f4', (2, 1)), ('b', 'f8', (1, 3))], (2, 2))),
+            np.dtype(([('a', 'f4', (2, 1)), ('b', 'i8', (1, 3))], (2, 2))))
+        assert_dtype_not_equal(
+            np.dtype(([('a', 'f4', (2, 1)), ('b', 'f8', (1, 3))], (2, 2))),
+            np.dtype(([('e', 'f8', (1, 3)), ('d', 'f4', (2, 1))], (2, 2))))
+        assert_dtype_not_equal(
+            np.dtype(([('a', [('a', 'i4', 6)], (2, 1)), ('b', 'f8', (1, 3))], (2, 2))),
+            np.dtype(([('a', [('a', 'u4', 6)], (2, 1)), ('b', 'f8', (1, 3))], (2, 2))))
+
+    def test_shape_sequence(self):
+        # Any sequence of integers should work as shape, but the result
+        # should be a tuple (immutable) of base type integers.
+        a = np.array([1, 2, 3], dtype=np.int16)
+        l = [1, 2, 3]
+        # Array gets converted
+        dt = np.dtype([('a', 'f4', a)])
+        assert_(isinstance(dt['a'].shape, tuple))
+        assert_(isinstance(dt['a'].shape[0], int))
+        # List gets converted
+        dt = np.dtype([('a', 'f4', l)])
+        assert_(isinstance(dt['a'].shape, tuple))
+        #
+
+        class IntLike:
+            def __index__(self):
+                return 3
+
+            def __int__(self):
+                # (a PyNumber_Check fails without __int__)
+                return 3
+
+        dt = np.dtype([('a', 'f4', IntLike())])
+        assert_(isinstance(dt['a'].shape, tuple))
+        assert_(isinstance(dt['a'].shape[0], int))
+        dt = np.dtype([('a', 'f4', (IntLike(),))])
+        assert_(isinstance(dt['a'].shape, tuple))
+        assert_(isinstance(dt['a'].shape[0], int))
+
+    def test_shape_matches_ndim(self):
+        dt = np.dtype([('a', 'f4', ())])
+        assert_equal(dt['a'].shape, ())
+        assert_equal(dt['a'].ndim, 0)
+
+        dt = np.dtype([('a', 'f4')])
+        assert_equal(dt['a'].shape, ())
+        assert_equal(dt['a'].ndim, 0)
+
+        dt = np.dtype([('a', 'f4', 4)])
+        assert_equal(dt['a'].shape, (4,))
+        assert_equal(dt['a'].ndim, 1)
+
+        dt = np.dtype([('a', 'f4', (1, 2, 3))])
+        assert_equal(dt['a'].shape, (1, 2, 3))
+        assert_equal(dt['a'].ndim, 3)
+
+    def test_shape_invalid(self):
+        # Check that the shape is valid.
+        max_int = np.iinfo(np.intc).max
+        max_intp = np.iinfo(np.intp).max
+        # Too large values (the datatype is part of this)
+        assert_raises(ValueError, np.dtype, [('a', 'f4', max_int // 4 + 1)])
+        assert_raises(ValueError, np.dtype, [('a', 'f4', max_int + 1)])
+        assert_raises(ValueError, np.dtype, [('a', 'f4', (max_int, 2))])
+        # Takes a different code path (fails earlier:
+        assert_raises(ValueError, np.dtype, [('a', 'f4', max_intp + 1)])
+        # Negative values
+        assert_raises(ValueError, np.dtype, [('a', 'f4', -1)])
+        assert_raises(ValueError, np.dtype, [('a', 'f4', (-1, -1))])
+
+    def test_alignment(self):
+        #Check that subarrays are aligned
+        t1 = np.dtype('(1,)i4', align=True)
+        t2 = np.dtype('2i4', align=True)
+        assert_equal(t1.alignment, t2.alignment)
+
+    def test_aligned_empty(self):
+        # Mainly regression test for gh-19696: construction failed completely
+        dt = np.dtype([], align=True)
+        assert dt == np.dtype([])
+        dt = np.dtype({"names": [], "formats": [], "itemsize": 0}, align=True)
+        assert dt == np.dtype([])
+
+    def test_subarray_base_item(self):
+        arr = np.ones(3, dtype=[("f", "i", 3)])
+        # Extracting the field "absorbs" the subarray into a view:
+        assert arr["f"].base is arr
+        # Extract the structured item, and then check the tuple component:
+        item = arr.item(0)
+        assert type(item) is tuple and len(item) == 1
+        assert item[0].base is arr
+
+    def test_subarray_cast_copies(self):
+        # Older versions of NumPy did NOT copy, but they got the ownership
+        # wrong (not actually knowing the correct base!).  Versions since 1.21
+        # (I think) crashed fairly reliable.  This defines the correct behavior
+        # as a copy.  Keeping the ownership would be possible (but harder)
+        arr = np.ones(3, dtype=[("f", "i", 3)])
+        cast = arr.astype(object)
+        for fields in cast:
+            assert type(fields) == tuple and len(fields) == 1
+            subarr = fields[0]
+            assert subarr.base is None
+            assert subarr.flags.owndata
+
+
+def iter_struct_object_dtypes():
+    """
+    Iterates over a few complex dtypes and object pattern which
+    fill the array with a given object (defaults to a singleton).
+
+    Yields
+    ------
+    dtype : dtype
+    pattern : tuple
+        Structured tuple for use with `np.array`.
+    count : int
+        Number of objects stored in the dtype.
+    singleton : object
+        A singleton object. The returned pattern is constructed so that
+        all objects inside the datatype are set to the singleton.
+    """
+    obj = object()
+
+    dt = np.dtype([('b', 'O', (2, 3))])
+    p = ([[obj] * 3] * 2,)
+    yield pytest.param(dt, p, 6, obj, id="<subarray>")
+
+    dt = np.dtype([('a', 'i4'), ('b', 'O', (2, 3))])
+    p = (0, [[obj] * 3] * 2)
+    yield pytest.param(dt, p, 6, obj, id="<subarray in field>")
+
+    dt = np.dtype([('a', 'i4'),
+                   ('b', [('ba', 'O'), ('bb', 'i1')], (2, 3))])
+    p = (0, [[(obj, 0)] * 3] * 2)
+    yield pytest.param(dt, p, 6, obj, id="<structured subarray 1>")
+
+    dt = np.dtype([('a', 'i4'),
+                   ('b', [('ba', 'O'), ('bb', 'O')], (2, 3))])
+    p = (0, [[(obj, obj)] * 3] * 2)
+    yield pytest.param(dt, p, 12, obj, id="<structured subarray 2>")
+
+
+@pytest.mark.skipif(
+    sys.version_info >= (3, 12),
+    reason="Python 3.12 has immortal refcounts, this test will no longer "
+           "work. See gh-23986"
+)
+@pytest.mark.skipif(not HAS_REFCOUNT, reason="Python lacks refcounts")
+class TestStructuredObjectRefcounting:
+    """These tests cover various uses of complicated structured types which
+    include objects and thus require reference counting.
+    """
+    @pytest.mark.parametrize(['dt', 'pat', 'count', 'singleton'],
+                             iter_struct_object_dtypes())
+    @pytest.mark.parametrize(["creation_func", "creation_obj"], [
+        pytest.param(np.empty, None,
+             # None is probably used for too many things
+             marks=pytest.mark.skip("unreliable due to python's behaviour")),
+        (np.ones, 1),
+        (np.zeros, 0)])
+    def test_structured_object_create_delete(self, dt, pat, count, singleton,
+                                             creation_func, creation_obj):
+        """Structured object reference counting in creation and deletion"""
+        # The test assumes that 0, 1, and None are singletons.
+        gc.collect()
+        before = sys.getrefcount(creation_obj)
+        arr = creation_func(3, dt)
+
+        now = sys.getrefcount(creation_obj)
+        assert now - before == count * 3
+        del arr
+        now = sys.getrefcount(creation_obj)
+        assert now == before
+
+    @pytest.mark.parametrize(['dt', 'pat', 'count', 'singleton'],
+                             iter_struct_object_dtypes())
+    def test_structured_object_item_setting(self, dt, pat, count, singleton):
+        """Structured object reference counting for simple item setting"""
+        one = 1
+
+        gc.collect()
+        before = sys.getrefcount(singleton)
+        arr = np.array([pat] * 3, dt)
+        assert sys.getrefcount(singleton) - before == count * 3
+        # Fill with `1` and check that it was replaced correctly:
+        before2 = sys.getrefcount(one)
+        arr[...] = one
+        after2 = sys.getrefcount(one)
+        assert after2 - before2 == count * 3
+        del arr
+        gc.collect()
+        assert sys.getrefcount(one) == before2
+        assert sys.getrefcount(singleton) == before
+
+    @pytest.mark.parametrize(['dt', 'pat', 'count', 'singleton'],
+                             iter_struct_object_dtypes())
+    @pytest.mark.parametrize(
+        ['shape', 'index', 'items_changed'],
+        [((3,), ([0, 2],), 2),
+         ((3, 2), ([0, 2], slice(None)), 4),
+         ((3, 2), ([0, 2], [1]), 2),
+         ((3,), ([True, False, True]), 2)])
+    def test_structured_object_indexing(self, shape, index, items_changed,
+                                        dt, pat, count, singleton):
+        """Structured object reference counting for advanced indexing."""
+        # Use two small negative values (should be singletons, but less likely
+        # to run into race-conditions).  This failed in some threaded envs
+        # When using 0 and 1.  If it fails again, should remove all explicit
+        # checks, and rely on `pytest-leaks` reference count checker only.
+        val0 = -4
+        val1 = -5
+
+        arr = np.full(shape, val0, dt)
+
+        gc.collect()
+        before_val0 = sys.getrefcount(val0)
+        before_val1 = sys.getrefcount(val1)
+        # Test item getting:
+        part = arr[index]
+        after_val0 = sys.getrefcount(val0)
+        assert after_val0 - before_val0 == count * items_changed
+        del part
+        # Test item setting:
+        arr[index] = val1
+        gc.collect()
+        after_val0 = sys.getrefcount(val0)
+        after_val1 = sys.getrefcount(val1)
+        assert before_val0 - after_val0 == count * items_changed
+        assert after_val1 - before_val1 == count * items_changed
+
+    @pytest.mark.parametrize(['dt', 'pat', 'count', 'singleton'],
+                             iter_struct_object_dtypes())
+    def test_structured_object_take_and_repeat(self, dt, pat, count, singleton):
+        """Structured object reference counting for specialized functions.
+        The older functions such as take and repeat use different code paths
+        then item setting (when writing this).
+        """
+        indices = [0, 1]
+
+        arr = np.array([pat] * 3, dt)
+        gc.collect()
+        before = sys.getrefcount(singleton)
+        res = arr.take(indices)
+        after = sys.getrefcount(singleton)
+        assert after - before == count * 2
+        new = res.repeat(10)
+        gc.collect()
+        after_repeat = sys.getrefcount(singleton)
+        assert after_repeat - after == count * 2 * 10
+
+
+class TestStructuredDtypeSparseFields:
+    """Tests subarray fields which contain sparse dtypes so that
+    not all memory is used by the dtype work. Such dtype's should
+    leave the underlying memory unchanged.
+    """
+    dtype = np.dtype([('a', {'names':['aa', 'ab'], 'formats':['f', 'f'],
+                             'offsets':[0, 4]}, (2, 3))])
+    sparse_dtype = np.dtype([('a', {'names':['ab'], 'formats':['f'],
+                                    'offsets':[4]}, (2, 3))])
+
+    def test_sparse_field_assignment(self):
+        arr = np.zeros(3, self.dtype)
+        sparse_arr = arr.view(self.sparse_dtype)
+
+        sparse_arr[...] = np.finfo(np.float32).max
+        # dtype is reduced when accessing the field, so shape is (3, 2, 3):
+        assert_array_equal(arr["a"]["aa"], np.zeros((3, 2, 3)))
+
+    def test_sparse_field_assignment_fancy(self):
+        # Fancy assignment goes to the copyswap function for complex types:
+        arr = np.zeros(3, self.dtype)
+        sparse_arr = arr.view(self.sparse_dtype)
+
+        sparse_arr[[0, 1, 2]] = np.finfo(np.float32).max
+        # dtype is reduced when accessing the field, so shape is (3, 2, 3):
+        assert_array_equal(arr["a"]["aa"], np.zeros((3, 2, 3)))
+
+
+class TestMonsterType:
+    """Test deeply nested subtypes."""
+
+    def test1(self):
+        simple1 = np.dtype({'names': ['r', 'b'], 'formats': ['u1', 'u1'],
+            'titles': ['Red pixel', 'Blue pixel']})
+        a = np.dtype([('yo', int), ('ye', simple1),
+            ('yi', np.dtype((int, (3, 2))))])
+        b = np.dtype([('yo', int), ('ye', simple1),
+            ('yi', np.dtype((int, (3, 2))))])
+        assert_dtype_equal(a, b)
+
+        c = np.dtype([('yo', int), ('ye', simple1),
+            ('yi', np.dtype((a, (3, 2))))])
+        d = np.dtype([('yo', int), ('ye', simple1),
+            ('yi', np.dtype((a, (3, 2))))])
+        assert_dtype_equal(c, d)
+
+    @pytest.mark.skipif(IS_PYSTON, reason="Pyston disables recursion checking")
+    def test_list_recursion(self):
+        l = list()
+        l.append(('f', l))
+        with pytest.raises(RecursionError):
+            np.dtype(l)
+
+    @pytest.mark.skipif(IS_PYSTON, reason="Pyston disables recursion checking")
+    def test_tuple_recursion(self):
+        d = np.int32
+        for i in range(100000):
+            d = (d, (1,))
+        with pytest.raises(RecursionError):
+            np.dtype(d)
+
+    @pytest.mark.skipif(IS_PYSTON, reason="Pyston disables recursion checking")
+    def test_dict_recursion(self):
+        d = dict(names=['self'], formats=[None], offsets=[0])
+        d['formats'][0] = d
+        with pytest.raises(RecursionError):
+            np.dtype(d)
+
+
+class TestMetadata:
+    def test_no_metadata(self):
+        d = np.dtype(int)
+        assert_(d.metadata is None)
+
+    def test_metadata_takes_dict(self):
+        d = np.dtype(int, metadata={'datum': 1})
+        assert_(d.metadata == {'datum': 1})
+
+    def test_metadata_rejects_nondict(self):
+        assert_raises(TypeError, np.dtype, int, metadata='datum')
+        assert_raises(TypeError, np.dtype, int, metadata=1)
+        assert_raises(TypeError, np.dtype, int, metadata=None)
+
+    def test_nested_metadata(self):
+        d = np.dtype([('a', np.dtype(int, metadata={'datum': 1}))])
+        assert_(d['a'].metadata == {'datum': 1})
+
+    def test_base_metadata_copied(self):
+        d = np.dtype((np.void, np.dtype('i4,i4', metadata={'datum': 1})))
+        assert_(d.metadata == {'datum': 1})
+
+class TestString:
+    def test_complex_dtype_str(self):
+        dt = np.dtype([('top', [('tiles', ('>f4', (64, 64)), (1,)),
+                                ('rtile', '>f4', (64, 36))], (3,)),
+                       ('bottom', [('bleft', ('>f4', (8, 64)), (1,)),
+                                   ('bright', '>f4', (8, 36))])])
+        assert_equal(str(dt),
+                     "[('top', [('tiles', ('>f4', (64, 64)), (1,)), "
+                     "('rtile', '>f4', (64, 36))], (3,)), "
+                     "('bottom', [('bleft', ('>f4', (8, 64)), (1,)), "
+                     "('bright', '>f4', (8, 36))])]")
+
+        # If the sticky aligned flag is set to True, it makes the
+        # str() function use a dict representation with an 'aligned' flag
+        dt = np.dtype([('top', [('tiles', ('>f4', (64, 64)), (1,)),
+                                ('rtile', '>f4', (64, 36))],
+                                (3,)),
+                       ('bottom', [('bleft', ('>f4', (8, 64)), (1,)),
+                                   ('bright', '>f4', (8, 36))])],
+                       align=True)
+        assert_equal(str(dt),
+                    "{'names': ['top', 'bottom'],"
+                    " 'formats': [([('tiles', ('>f4', (64, 64)), (1,)), "
+                                   "('rtile', '>f4', (64, 36))], (3,)), "
+                                  "[('bleft', ('>f4', (8, 64)), (1,)), "
+                                   "('bright', '>f4', (8, 36))]],"
+                    " 'offsets': [0, 76800],"
+                    " 'itemsize': 80000,"
+                    " 'aligned': True}")
+        with np.printoptions(legacy='1.21'):
+            assert_equal(str(dt),
+                        "{'names':['top','bottom'], "
+                         "'formats':[([('tiles', ('>f4', (64, 64)), (1,)), "
+                                      "('rtile', '>f4', (64, 36))], (3,)),"
+                                     "[('bleft', ('>f4', (8, 64)), (1,)), "
+                                      "('bright', '>f4', (8, 36))]], "
+                         "'offsets':[0,76800], "
+                         "'itemsize':80000, "
+                         "'aligned':True}")
+        assert_equal(np.dtype(eval(str(dt))), dt)
+
+        dt = np.dtype({'names': ['r', 'g', 'b'], 'formats': ['u1', 'u1', 'u1'],
+                        'offsets': [0, 1, 2],
+                        'titles': ['Red pixel', 'Green pixel', 'Blue pixel']})
+        assert_equal(str(dt),
+                    "[(('Red pixel', 'r'), 'u1'), "
+                    "(('Green pixel', 'g'), 'u1'), "
+                    "(('Blue pixel', 'b'), 'u1')]")
+
+        dt = np.dtype({'names': ['rgba', 'r', 'g', 'b'],
+                       'formats': ['<u4', 'u1', 'u1', 'u1'],
+                       'offsets': [0, 0, 1, 2],
+                       'titles': ['Color', 'Red pixel',
+                                  'Green pixel', 'Blue pixel']})
+        assert_equal(str(dt),
+                    "{'names': ['rgba', 'r', 'g', 'b'],"
+                    " 'formats': ['<u4', 'u1', 'u1', 'u1'],"
+                    " 'offsets': [0, 0, 1, 2],"
+                    " 'titles': ['Color', 'Red pixel', "
+                               "'Green pixel', 'Blue pixel'],"
+                    " 'itemsize': 4}")
+
+        dt = np.dtype({'names': ['r', 'b'], 'formats': ['u1', 'u1'],
+                        'offsets': [0, 2],
+                        'titles': ['Red pixel', 'Blue pixel']})
+        assert_equal(str(dt),
+                    "{'names': ['r', 'b'],"
+                    " 'formats': ['u1', 'u1'],"
+                    " 'offsets': [0, 2],"
+                    " 'titles': ['Red pixel', 'Blue pixel'],"
+                    " 'itemsize': 3}")
+
+        dt = np.dtype([('a', '<m8[D]'), ('b', '<M8[us]')])
+        assert_equal(str(dt),
+                    "[('a', '<m8[D]'), ('b', '<M8[us]')]")
+
+    def test_repr_structured(self):
+        dt = np.dtype([('top', [('tiles', ('>f4', (64, 64)), (1,)),
+                                ('rtile', '>f4', (64, 36))], (3,)),
+                       ('bottom', [('bleft', ('>f4', (8, 64)), (1,)),
+                                   ('bright', '>f4', (8, 36))])])
+        assert_equal(repr(dt),
+                     "dtype([('top', [('tiles', ('>f4', (64, 64)), (1,)), "
+                     "('rtile', '>f4', (64, 36))], (3,)), "
+                     "('bottom', [('bleft', ('>f4', (8, 64)), (1,)), "
+                     "('bright', '>f4', (8, 36))])])")
+
+        dt = np.dtype({'names': ['r', 'g', 'b'], 'formats': ['u1', 'u1', 'u1'],
+                        'offsets': [0, 1, 2],
+                        'titles': ['Red pixel', 'Green pixel', 'Blue pixel']},
+                        align=True)
+        assert_equal(repr(dt),
+                    "dtype([(('Red pixel', 'r'), 'u1'), "
+                    "(('Green pixel', 'g'), 'u1'), "
+                    "(('Blue pixel', 'b'), 'u1')], align=True)")
+
+    def test_repr_structured_not_packed(self):
+        dt = np.dtype({'names': ['rgba', 'r', 'g', 'b'],
+                       'formats': ['<u4', 'u1', 'u1', 'u1'],
+                       'offsets': [0, 0, 1, 2],
+                       'titles': ['Color', 'Red pixel',
+                                  'Green pixel', 'Blue pixel']}, align=True)
+        assert_equal(repr(dt),
+                    "dtype({'names': ['rgba', 'r', 'g', 'b'],"
+                    " 'formats': ['<u4', 'u1', 'u1', 'u1'],"
+                    " 'offsets': [0, 0, 1, 2],"
+                    " 'titles': ['Color', 'Red pixel', "
+                                "'Green pixel', 'Blue pixel'],"
+                    " 'itemsize': 4}, align=True)")
+
+        dt = np.dtype({'names': ['r', 'b'], 'formats': ['u1', 'u1'],
+                        'offsets': [0, 2],
+                        'titles': ['Red pixel', 'Blue pixel'],
+                        'itemsize': 4})
+        assert_equal(repr(dt),
+                    "dtype({'names': ['r', 'b'], "
+                    "'formats': ['u1', 'u1'], "
+                    "'offsets': [0, 2], "
+                    "'titles': ['Red pixel', 'Blue pixel'], "
+                    "'itemsize': 4})")
+
+    def test_repr_structured_datetime(self):
+        dt = np.dtype([('a', '<M8[D]'), ('b', '<m8[us]')])
+        assert_equal(repr(dt),
+                    "dtype([('a', '<M8[D]'), ('b', '<m8[us]')])")
+
+    def test_repr_str_subarray(self):
+        dt = np.dtype(('<i2', (1,)))
+        assert_equal(repr(dt), "dtype(('<i2', (1,)))")
+        assert_equal(str(dt), "('<i2', (1,))")
+
+    def test_base_dtype_with_object_type(self):
+        # Issue gh-2798, should not error.
+        np.array(['a'], dtype="O").astype(("O", [("name", "O")]))
+
+    def test_empty_string_to_object(self):
+        # Pull request #4722
+        np.array(["", ""]).astype(object)
+
+    def test_void_subclass_unsized(self):
+        dt = np.dtype(np.record)
+        assert_equal(repr(dt), "dtype('V')")
+        assert_equal(str(dt), '|V0')
+        assert_equal(dt.name, 'record')
+
+    def test_void_subclass_sized(self):
+        dt = np.dtype((np.record, 2))
+        assert_equal(repr(dt), "dtype('V2')")
+        assert_equal(str(dt), '|V2')
+        assert_equal(dt.name, 'record16')
+
+    def test_void_subclass_fields(self):
+        dt = np.dtype((np.record, [('a', '<u2')]))
+        assert_equal(repr(dt), "dtype((numpy.record, [('a', '<u2')]))")
+        assert_equal(str(dt), "(numpy.record, [('a', '<u2')])")
+        assert_equal(dt.name, 'record16')
+
+
+class TestDtypeAttributeDeletion:
+
+    def test_dtype_non_writable_attributes_deletion(self):
+        dt = np.dtype(np.double)
+        attr = ["subdtype", "descr", "str", "name", "base", "shape",
+                "isbuiltin", "isnative", "isalignedstruct", "fields",
+                "metadata", "hasobject"]
+
+        for s in attr:
+            assert_raises(AttributeError, delattr, dt, s)
+
+    def test_dtype_writable_attributes_deletion(self):
+        dt = np.dtype(np.double)
+        attr = ["names"]
+        for s in attr:
+            assert_raises(AttributeError, delattr, dt, s)
+
+
+class TestDtypeAttributes:
+    def test_descr_has_trailing_void(self):
+        # see gh-6359
+        dtype = np.dtype({
+            'names': ['A', 'B'],
+            'formats': ['f4', 'f4'],
+            'offsets': [0, 8],
+            'itemsize': 16})
+        new_dtype = np.dtype(dtype.descr)
+        assert_equal(new_dtype.itemsize, 16)
+
+    def test_name_dtype_subclass(self):
+        # Ticket #4357
+        class user_def_subcls(np.void):
+            pass
+        assert_equal(np.dtype(user_def_subcls).name, 'user_def_subcls')
+
+    def test_zero_stride(self):
+        arr = np.ones(1, dtype="i8")
+        arr = np.broadcast_to(arr, 10)
+        assert arr.strides == (0,)
+        with pytest.raises(ValueError):
+            arr.dtype = "i1"
+
+class TestDTypeMakeCanonical:
+    def check_canonical(self, dtype, canonical):
+        """
+        Check most properties relevant to "canonical" versions of a dtype,
+        which is mainly native byte order for datatypes supporting this.
+
+        The main work is checking structured dtypes with fields, where we
+        reproduce most the actual logic used in the C-code.
+        """
+        assert type(dtype) is type(canonical)
+
+        # a canonical DType should always have equivalent casting (both ways)
+        assert np.can_cast(dtype, canonical, casting="equiv")
+        assert np.can_cast(canonical, dtype, casting="equiv")
+        # a canonical dtype (and its fields) is always native (checks fields):
+        assert canonical.isnative
+
+        # Check that canonical of canonical is the same (no casting):
+        assert np.result_type(canonical) == canonical
+
+        if not dtype.names:
+            # The flags currently never change for unstructured dtypes
+            assert dtype.flags == canonical.flags
+            return
+
+        # Must have all the needs API flag set:
+        assert dtype.flags & 0b10000
+
+        # Check that the fields are identical (including titles):
+        assert dtype.fields.keys() == canonical.fields.keys()
+
+        def aligned_offset(offset, alignment):
+            # round up offset:
+            return - (-offset // alignment) * alignment
+
+        totalsize = 0
+        max_alignment = 1
+        for name in dtype.names:
+            # each field is also canonical:
+            new_field_descr = canonical.fields[name][0]
+            self.check_canonical(dtype.fields[name][0], new_field_descr)
+
+            # Must have the "inherited" object related flags:
+            expected = 0b11011 & new_field_descr.flags
+            assert (canonical.flags & expected) == expected
+
+            if canonical.isalignedstruct:
+                totalsize = aligned_offset(totalsize, new_field_descr.alignment)
+                max_alignment = max(new_field_descr.alignment, max_alignment)
+
+            assert canonical.fields[name][1] == totalsize
+            # if a title exists, they must match (otherwise empty tuple):
+            assert dtype.fields[name][2:] == canonical.fields[name][2:]
+
+            totalsize += new_field_descr.itemsize
+
+        if canonical.isalignedstruct:
+            totalsize = aligned_offset(totalsize, max_alignment)
+        assert canonical.itemsize == totalsize
+        assert canonical.alignment == max_alignment
+
+    def test_simple(self):
+        dt = np.dtype(">i4")
+        assert np.result_type(dt).isnative
+        assert np.result_type(dt).num == dt.num
+
+        # dtype with empty space:
+        struct_dt = np.dtype(">i4,<i1,i8,V3")[["f0", "f2"]]
+        canonical = np.result_type(struct_dt)
+        assert canonical.itemsize == 4+8
+        assert canonical.isnative
+
+        # aligned struct dtype with empty space:
+        struct_dt = np.dtype(">i1,<i4,i8,V3", align=True)[["f0", "f2"]]
+        canonical = np.result_type(struct_dt)
+        assert canonical.isalignedstruct
+        assert canonical.itemsize == np.dtype("i8").alignment + 8
+        assert canonical.isnative
+
+    def test_object_flag_not_inherited(self):
+        # The following dtype still indicates "object", because its included
+        # in the unaccessible space (maybe this could change at some point):
+        arr = np.ones(3, "i,O,i")[["f0", "f2"]]
+        assert arr.dtype.hasobject
+        canonical_dt = np.result_type(arr.dtype)
+        assert not canonical_dt.hasobject
+
+    @pytest.mark.slow
+    @hypothesis.given(dtype=hynp.nested_dtypes())
+    def test_make_canonical_hypothesis(self, dtype):
+        canonical = np.result_type(dtype)
+        self.check_canonical(dtype, canonical)
+        # result_type with two arguments should always give identical results:
+        two_arg_result = np.result_type(dtype, dtype)
+        assert np.can_cast(two_arg_result, canonical, casting="no")
+
+    @pytest.mark.slow
+    @hypothesis.given(
+            dtype=hypothesis.extra.numpy.array_dtypes(
+                subtype_strategy=hypothesis.extra.numpy.array_dtypes(),
+                min_size=5, max_size=10, allow_subarrays=True))
+    def test_structured(self, dtype):
+        # Pick 4 of the fields at random.  This will leave empty space in the
+        # dtype (since we do not canonicalize it here).
+        field_subset = random.sample(dtype.names, k=4)
+        dtype_with_empty_space = dtype[field_subset]
+        assert dtype_with_empty_space.itemsize == dtype.itemsize
+        canonicalized = np.result_type(dtype_with_empty_space)
+        self.check_canonical(dtype_with_empty_space, canonicalized)
+        # promotion with two arguments should always give identical results:
+        two_arg_result = np.promote_types(
+                dtype_with_empty_space, dtype_with_empty_space)
+        assert np.can_cast(two_arg_result, canonicalized, casting="no")
+
+        # Ensure that we also check aligned struct (check the opposite, in
+        # case hypothesis grows support for `align`.  Then repeat the test:
+        dtype_aligned = np.dtype(dtype.descr, align=not dtype.isalignedstruct)
+        dtype_with_empty_space = dtype_aligned[field_subset]
+        assert dtype_with_empty_space.itemsize == dtype_aligned.itemsize
+        canonicalized = np.result_type(dtype_with_empty_space)
+        self.check_canonical(dtype_with_empty_space, canonicalized)
+        # promotion with two arguments should always give identical results:
+        two_arg_result = np.promote_types(
+            dtype_with_empty_space, dtype_with_empty_space)
+        assert np.can_cast(two_arg_result, canonicalized, casting="no")
+
+
+class TestPickling:
+
+    def check_pickling(self, dtype):
+        for proto in range(pickle.HIGHEST_PROTOCOL + 1):
+            buf = pickle.dumps(dtype, proto)
+            # The dtype pickling itself pickles `np.dtype` if it is pickled
+            # as a singleton `dtype` should be stored in the buffer:
+            assert b"_DType_reconstruct" not in buf
+            assert b"dtype" in buf
+            pickled = pickle.loads(buf)
+            assert_equal(pickled, dtype)
+            assert_equal(pickled.descr, dtype.descr)
+            if dtype.metadata is not None:
+                assert_equal(pickled.metadata, dtype.metadata)
+            # Check the reconstructed dtype is functional
+            x = np.zeros(3, dtype=dtype)
+            y = np.zeros(3, dtype=pickled)
+            assert_equal(x, y)
+            assert_equal(x[0], y[0])
+
+    @pytest.mark.parametrize('t', [int, float, complex, np.int32, str, object,
+                                   bool])
+    def test_builtin(self, t):
+        self.check_pickling(np.dtype(t))
+
+    def test_structured(self):
+        dt = np.dtype(([('a', '>f4', (2, 1)), ('b', '<f8', (1, 3))], (2, 2)))
+        self.check_pickling(dt)
+
+    def test_structured_aligned(self):
+        dt = np.dtype('i4, i1', align=True)
+        self.check_pickling(dt)
+
+    def test_structured_unaligned(self):
+        dt = np.dtype('i4, i1', align=False)
+        self.check_pickling(dt)
+
+    def test_structured_padded(self):
+        dt = np.dtype({
+            'names': ['A', 'B'],
+            'formats': ['f4', 'f4'],
+            'offsets': [0, 8],
+            'itemsize': 16})
+        self.check_pickling(dt)
+
+    def test_structured_titles(self):
+        dt = np.dtype({'names': ['r', 'b'],
+                       'formats': ['u1', 'u1'],
+                       'titles': ['Red pixel', 'Blue pixel']})
+        self.check_pickling(dt)
+
+    @pytest.mark.parametrize('base', ['m8', 'M8'])
+    @pytest.mark.parametrize('unit', ['', 'Y', 'M', 'W', 'D', 'h', 'm', 's',
+                                      'ms', 'us', 'ns', 'ps', 'fs', 'as'])
+    def test_datetime(self, base, unit):
+        dt = np.dtype('%s[%s]' % (base, unit) if unit else base)
+        self.check_pickling(dt)
+        if unit:
+            dt = np.dtype('%s[7%s]' % (base, unit))
+            self.check_pickling(dt)
+
+    def test_metadata(self):
+        dt = np.dtype(int, metadata={'datum': 1})
+        self.check_pickling(dt)
+
+    @pytest.mark.parametrize("DType",
+        [type(np.dtype(t)) for t in np.typecodes['All']] +
+        [type(np.dtype(rational)), np.dtype])
+    def test_pickle_dtype_class(self, DType):
+        # Check that DTypes (the classes/types) roundtrip when pickling
+        for proto in range(pickle.HIGHEST_PROTOCOL + 1):
+            roundtrip_DType = pickle.loads(pickle.dumps(DType, proto))
+            assert roundtrip_DType is DType
+
+    @pytest.mark.parametrize("dt",
+        [np.dtype(t) for t in np.typecodes['All']] +
+        [np.dtype(rational)])
+    def test_pickle_dtype(self, dt):
+        # Check that dtype instances roundtrip when pickling and that pickling
+        # doesn't change the hash value
+        pre_pickle_hash = hash(dt)
+        for proto in range(pickle.HIGHEST_PROTOCOL + 1):
+            roundtrip_dt = pickle.loads(pickle.dumps(dt, proto))
+            assert roundtrip_dt == dt
+            assert hash(dt) == pre_pickle_hash
+
+
+class TestPromotion:
+    """Test cases related to more complex DType promotions.  Further promotion
+    tests are defined in `test_numeric.py`
+    """
+    @pytest.mark.parametrize(["other", "expected"],
+            [(2**16-1, np.complex64),
+             (2**32-1, np.complex64),
+             (np.float16(2), np.complex64),
+             (np.float32(2), np.complex64),
+             (np.longdouble(2), np.clongdouble),
+             # Base of the double value to sidestep any rounding issues:
+             (np.longdouble(np.nextafter(1.7e308, 0.)), np.clongdouble),
+             # Additionally use "nextafter" so the cast can't round down:
+             (np.longdouble(np.nextafter(1.7e308, np.inf)), np.clongdouble),
+             # repeat for complex scalars:
+             (np.complex64(2), np.complex64),
+             (np.clongdouble(2), np.clongdouble),
+             # Base of the double value to sidestep any rounding issues:
+             (np.clongdouble(np.nextafter(1.7e308, 0.) * 1j), np.clongdouble),
+             # Additionally use "nextafter" so the cast can't round down:
+             (np.clongdouble(np.nextafter(1.7e308, np.inf)), np.clongdouble),
+             ])
+    def test_complex_other_value_based(self, other, expected):
+        # This would change if we modify the value based promotion
+        min_complex = np.dtype(np.complex64)
+
+        res = np.result_type(other, min_complex)
+        assert res == expected
+        # Check the same for a simple ufunc call that uses the same logic:
+        res = np.minimum(other, np.ones(3, dtype=min_complex)).dtype
+        assert res == expected
+
+    @pytest.mark.parametrize(["other", "expected"],
+                 [(np.bool, np.complex128),
+                  (np.int64, np.complex128),
+                  (np.float16, np.complex64),
+                  (np.float32, np.complex64),
+                  (np.float64, np.complex128),
+                  (np.longdouble, np.clongdouble),
+                  (np.complex64, np.complex64),
+                  (np.complex128, np.complex128),
+                  (np.clongdouble, np.clongdouble),
+                  ])
+    def test_complex_scalar_value_based(self, other, expected):
+        # This would change if we modify the value based promotion
+        complex_scalar = 1j
+
+        res = np.result_type(other, complex_scalar)
+        assert res == expected
+        # Check the same for a simple ufunc call that uses the same logic:
+        res = np.minimum(np.ones(3, dtype=other), complex_scalar).dtype
+        assert res == expected
+
+    def test_complex_pyscalar_promote_rational(self):
+        with pytest.raises(TypeError,
+                match=r".* no common DType exists for the given inputs"):
+            np.result_type(1j, rational)
+
+        with pytest.raises(TypeError,
+                match=r".* no common DType exists for the given inputs"):
+            np.result_type(1j, rational(1, 2))
+
+    @pytest.mark.parametrize("val", [2, 2**32, 2**63, 2**64, 2*100])
+    def test_python_integer_promotion(self, val):
+        # If we only pass scalars (mainly python ones!), NEP 50 means
+        # that we get the default integer
+        expected_dtype = np.dtype(int)  # the default integer
+        assert np.result_type(val, 0) == expected_dtype
+        # With NEP 50, the NumPy scalar wins though:
+        assert np.result_type(val, np.int8(0)) == np.int8
+
+    @pytest.mark.parametrize(["other", "expected"],
+            [(1, rational), (1., np.float64)])
+    def test_float_int_pyscalar_promote_rational(self, other, expected):
+        # Note that rationals are a bit awkward as they promote with float64
+        # or default ints, but not float16 or uint8/int8 (which looks
+        # inconsistent here).  The new promotion fixed this (partially?)
+        assert np.result_type(other, rational) == expected
+        assert np.result_type(other, rational(1, 2)) == expected
+
+    @pytest.mark.parametrize(["dtypes", "expected"], [
+             # These promotions are not associative/commutative:
+             ([np.uint16, np.int16, np.float16], np.float32),
+             ([np.uint16, np.int8, np.float16], np.float32),
+             ([np.uint8, np.int16, np.float16], np.float32),
+             # The following promotions are not ambiguous, but cover code
+             # paths of abstract promotion (no particular logic being tested)
+             ([1, 1, np.float64], np.float64),
+             ([1, 1., np.complex128], np.complex128),
+             ([1, 1j, np.float64], np.complex128),
+             ([1., 1., np.int64], np.float64),
+             ([1., 1j, np.float64], np.complex128),
+             ([1j, 1j, np.float64], np.complex128),
+             ([1, True, np.bool], np.int_),
+            ])
+    def test_permutations_do_not_influence_result(self, dtypes, expected):
+        # Tests that most permutations do not influence the result.  In the
+        # above some uint and int combinations promote to a larger integer
+        # type, which would then promote to a larger than necessary float.
+        for perm in permutations(dtypes):
+            assert np.result_type(*perm) == expected
+
+
+def test_rational_dtype():
+    # test for bug gh-5719
+    a = np.array([1111], dtype=rational).astype
+    assert_raises(OverflowError, a, 'int8')
+
+    # test that dtype detection finds user-defined types
+    x = rational(1)
+    assert_equal(np.array([x,x]).dtype, np.dtype(rational))
+
+
+def test_dtypes_are_true():
+    # test for gh-6294
+    assert bool(np.dtype('f8'))
+    assert bool(np.dtype('i8'))
+    assert bool(np.dtype([('a', 'i8'), ('b', 'f4')]))
+
+
+def test_invalid_dtype_string():
+    # test for gh-10440
+    assert_raises(TypeError, np.dtype, 'f8,i8,[f8,i8]')
+    assert_raises(TypeError, np.dtype, 'Fl\xfcgel')
+
+
+def test_keyword_argument():
+    # test for https://github.com/numpy/numpy/pull/16574#issuecomment-642660971
+    assert np.dtype(dtype=np.float64) == np.dtype(np.float64)
+
+
+class TestFromDTypeAttribute:
+    def test_simple(self):
+        class dt:
+            dtype = np.dtype("f8")
+
+        assert np.dtype(dt) == np.float64
+        assert np.dtype(dt()) == np.float64
+
+    @pytest.mark.skipif(IS_PYSTON, reason="Pyston disables recursion checking")
+    def test_recursion(self):
+        class dt:
+            pass
+
+        dt.dtype = dt
+        with pytest.raises(RecursionError):
+            np.dtype(dt)
+
+        dt_instance = dt()
+        dt_instance.dtype = dt
+        with pytest.raises(RecursionError):
+            np.dtype(dt_instance)
+
+    def test_void_subtype(self):
+        class dt(np.void):
+            # This code path is fully untested before, so it is unclear
+            # what this should be useful for. Note that if np.void is used
+            # numpy will think we are deallocating a base type [1.17, 2019-02].
+            dtype = np.dtype("f,f")
+
+        np.dtype(dt)
+        np.dtype(dt(1))
+
+    @pytest.mark.skipif(IS_PYSTON, reason="Pyston disables recursion checking")
+    def test_void_subtype_recursion(self):
+        class vdt(np.void):
+            pass
+
+        vdt.dtype = vdt
+
+        with pytest.raises(RecursionError):
+            np.dtype(vdt)
+
+        with pytest.raises(RecursionError):
+            np.dtype(vdt(1))
+
+
+class TestDTypeClasses:
+    @pytest.mark.parametrize("dtype", list(np.typecodes['All']) + [rational])
+    def test_basic_dtypes_subclass_properties(self, dtype):
+        # Note: Except for the isinstance and type checks, these attributes
+        #       are considered currently private and may change.
+        dtype = np.dtype(dtype)
+        assert isinstance(dtype, np.dtype)
+        assert type(dtype) is not np.dtype
+        if dtype.type.__name__ != "rational":
+            dt_name = type(dtype).__name__.lower().removesuffix("dtype")
+            if dt_name == "uint" or dt_name == "int":
+                # The scalar names has a `c` attached because "int" is Python
+                # int and that is long...
+                dt_name += "c"
+            sc_name = dtype.type.__name__
+            assert dt_name == sc_name.strip("_")
+            assert type(dtype).__module__ == "numpy.dtypes"
+
+            assert getattr(numpy.dtypes, type(dtype).__name__) is type(dtype)
+        else:
+            assert type(dtype).__name__ == "dtype[rational]"
+            assert type(dtype).__module__ == "numpy"
+
+        assert not type(dtype)._abstract
+
+        # the flexible dtypes and datetime/timedelta have additional parameters
+        # which are more than just storage information, these would need to be
+        # given when creating a dtype:
+        parametric = (np.void, np.str_, np.bytes_, np.datetime64, np.timedelta64)
+        if dtype.type not in parametric:
+            assert not type(dtype)._parametric
+            assert type(dtype)() is dtype
+        else:
+            assert type(dtype)._parametric
+            with assert_raises(TypeError):
+                type(dtype)()
+
+    def test_dtype_superclass(self):
+        assert type(np.dtype) is not type
+        assert isinstance(np.dtype, type)
+
+        assert type(np.dtype).__name__ == "_DTypeMeta"
+        assert type(np.dtype).__module__ == "numpy"
+        assert np.dtype._abstract
+
+    def test_is_numeric(self):
+        all_codes = set(np.typecodes['All'])
+        numeric_codes = set(np.typecodes['AllInteger'] +
+                            np.typecodes['AllFloat'] + '?')
+        non_numeric_codes = all_codes - numeric_codes
+
+        for code in numeric_codes:
+            assert type(np.dtype(code))._is_numeric
+
+        for code in non_numeric_codes:
+            assert not type(np.dtype(code))._is_numeric
+
+    @pytest.mark.parametrize("int_", ["UInt", "Int"])
+    @pytest.mark.parametrize("size", [8, 16, 32, 64])
+    def test_integer_alias_names(self, int_, size):
+        DType = getattr(numpy.dtypes, f"{int_}{size}DType")
+        sctype = getattr(numpy, f"{int_.lower()}{size}")
+        assert DType.type is sctype
+        assert DType.__name__.lower().removesuffix("dtype") == sctype.__name__
+
+    @pytest.mark.parametrize("name",
+            ["Half", "Float", "Double", "CFloat", "CDouble"])
+    def test_float_alias_names(self, name):
+        with pytest.raises(AttributeError):
+            getattr(numpy.dtypes, name + "DType") is numpy.dtypes.Float16DType
+
+
+class TestFromCTypes:
+
+    @staticmethod
+    def check(ctype, dtype):
+        dtype = np.dtype(dtype)
+        assert np.dtype(ctype) == dtype
+        assert np.dtype(ctype()) == dtype
+        assert ctypes.sizeof(ctype) == dtype.itemsize
+
+    def test_array(self):
+        c8 = ctypes.c_uint8
+        self.check(     3 * c8,  (np.uint8, (3,)))
+        self.check(     1 * c8,  (np.uint8, (1,)))
+        self.check(     0 * c8,  (np.uint8, (0,)))
+        self.check(1 * (3 * c8), ((np.uint8, (3,)), (1,)))
+        self.check(3 * (1 * c8), ((np.uint8, (1,)), (3,)))
+
+    def test_padded_structure(self):
+        class PaddedStruct(ctypes.Structure):
+            _fields_ = [
+                ('a', ctypes.c_uint8),
+                ('b', ctypes.c_uint16)
+            ]
+        expected = np.dtype([
+            ('a', np.uint8),
+            ('b', np.uint16)
+        ], align=True)
+        self.check(PaddedStruct, expected)
+
+    def test_bit_fields(self):
+        class BitfieldStruct(ctypes.Structure):
+            _fields_ = [
+                ('a', ctypes.c_uint8, 7),
+                ('b', ctypes.c_uint8, 1)
+            ]
+        assert_raises(TypeError, np.dtype, BitfieldStruct)
+        assert_raises(TypeError, np.dtype, BitfieldStruct())
+
+    def test_pointer(self):
+        p_uint8 = ctypes.POINTER(ctypes.c_uint8)
+        assert_raises(TypeError, np.dtype, p_uint8)
+
+    def test_size_t(self):
+        assert np.dtype(np.uintp) is np.dtype("N")
+        self.check(ctypes.c_size_t, np.uintp)
+
+    def test_void_pointer(self):
+        self.check(ctypes.c_void_p, "P")
+
+    def test_union(self):
+        class Union(ctypes.Union):
+            _fields_ = [
+                ('a', ctypes.c_uint8),
+                ('b', ctypes.c_uint16),
+            ]
+        expected = np.dtype(dict(
+            names=['a', 'b'],
+            formats=[np.uint8, np.uint16],
+            offsets=[0, 0],
+            itemsize=2
+        ))
+        self.check(Union, expected)
+
+    def test_union_with_struct_packed(self):
+        class Struct(ctypes.Structure):
+            _pack_ = 1
+            _fields_ = [
+                ('one', ctypes.c_uint8),
+                ('two', ctypes.c_uint32)
+            ]
+
+        class Union(ctypes.Union):
+            _fields_ = [
+                ('a', ctypes.c_uint8),
+                ('b', ctypes.c_uint16),
+                ('c', ctypes.c_uint32),
+                ('d', Struct),
+            ]
+        expected = np.dtype(dict(
+            names=['a', 'b', 'c', 'd'],
+            formats=['u1', np.uint16, np.uint32, [('one', 'u1'), ('two', np.uint32)]],
+            offsets=[0, 0, 0, 0],
+            itemsize=ctypes.sizeof(Union)
+        ))
+        self.check(Union, expected)
+
+    def test_union_packed(self):
+        class Struct(ctypes.Structure):
+            _fields_ = [
+                ('one', ctypes.c_uint8),
+                ('two', ctypes.c_uint32)
+            ]
+            _pack_ = 1
+        class Union(ctypes.Union):
+            _pack_ = 1
+            _fields_ = [
+                ('a', ctypes.c_uint8),
+                ('b', ctypes.c_uint16),
+                ('c', ctypes.c_uint32),
+                ('d', Struct),
+            ]
+        expected = np.dtype(dict(
+            names=['a', 'b', 'c', 'd'],
+            formats=['u1', np.uint16, np.uint32, [('one', 'u1'), ('two', np.uint32)]],
+            offsets=[0, 0, 0, 0],
+            itemsize=ctypes.sizeof(Union)
+        ))
+        self.check(Union, expected)
+
+    def test_packed_structure(self):
+        class PackedStructure(ctypes.Structure):
+            _pack_ = 1
+            _fields_ = [
+                ('a', ctypes.c_uint8),
+                ('b', ctypes.c_uint16)
+            ]
+        expected = np.dtype([
+            ('a', np.uint8),
+            ('b', np.uint16)
+        ])
+        self.check(PackedStructure, expected)
+
+    def test_large_packed_structure(self):
+        class PackedStructure(ctypes.Structure):
+            _pack_ = 2
+            _fields_ = [
+                ('a', ctypes.c_uint8),
+                ('b', ctypes.c_uint16),
+                ('c', ctypes.c_uint8),
+                ('d', ctypes.c_uint16),
+                ('e', ctypes.c_uint32),
+                ('f', ctypes.c_uint32),
+                ('g', ctypes.c_uint8)
+                ]
+        expected = np.dtype(dict(
+            formats=[np.uint8, np.uint16, np.uint8, np.uint16, np.uint32, np.uint32, np.uint8 ],
+            offsets=[0, 2, 4, 6, 8, 12, 16],
+            names=['a', 'b', 'c', 'd', 'e', 'f', 'g'],
+            itemsize=18))
+        self.check(PackedStructure, expected)
+
+    def test_big_endian_structure_packed(self):
+        class BigEndStruct(ctypes.BigEndianStructure):
+            _fields_ = [
+                ('one', ctypes.c_uint8),
+                ('two', ctypes.c_uint32)
+            ]
+            _pack_ = 1
+        expected = np.dtype([('one', 'u1'), ('two', '>u4')])
+        self.check(BigEndStruct, expected)
+
+    def test_little_endian_structure_packed(self):
+        class LittleEndStruct(ctypes.LittleEndianStructure):
+            _fields_ = [
+                ('one', ctypes.c_uint8),
+                ('two', ctypes.c_uint32)
+            ]
+            _pack_ = 1
+        expected = np.dtype([('one', 'u1'), ('two', '<u4')])
+        self.check(LittleEndStruct, expected)
+
+    def test_little_endian_structure(self):
+        class PaddedStruct(ctypes.LittleEndianStructure):
+            _fields_ = [
+                ('a', ctypes.c_uint8),
+                ('b', ctypes.c_uint16)
+            ]
+        expected = np.dtype([
+            ('a', '<B'),
+            ('b', '<H')
+        ], align=True)
+        self.check(PaddedStruct, expected)
+
+    def test_big_endian_structure(self):
+        class PaddedStruct(ctypes.BigEndianStructure):
+            _fields_ = [
+                ('a', ctypes.c_uint8),
+                ('b', ctypes.c_uint16)
+            ]
+        expected = np.dtype([
+            ('a', '>B'),
+            ('b', '>H')
+        ], align=True)
+        self.check(PaddedStruct, expected)
+
+    def test_simple_endian_types(self):
+        self.check(ctypes.c_uint16.__ctype_le__, np.dtype('<u2'))
+        self.check(ctypes.c_uint16.__ctype_be__, np.dtype('>u2'))
+        self.check(ctypes.c_uint8.__ctype_le__, np.dtype('u1'))
+        self.check(ctypes.c_uint8.__ctype_be__, np.dtype('u1'))
+
+    all_types = set(np.typecodes['All'])
+    all_pairs = permutations(all_types, 2)
+
+    @pytest.mark.parametrize("pair", all_pairs)
+    def test_pairs(self, pair):
+        """
+        Check that np.dtype('x,y') matches [np.dtype('x'), np.dtype('y')]
+        Example: np.dtype('d,I') -> dtype([('f0', '<f8'), ('f1', '<u4')])
+        """
+        # gh-5645: check that np.dtype('i,L') can be used
+        pair_type = np.dtype('{},{}'.format(*pair))
+        expected = np.dtype([('f0', pair[0]), ('f1', pair[1])])
+        assert_equal(pair_type, expected)
+
+
+class TestUserDType:
+    @pytest.mark.leaks_references(reason="dynamically creates custom dtype.")
+    def test_custom_structured_dtype(self):
+        class mytype:
+            pass
+
+        blueprint = np.dtype([("field", object)])
+        dt = create_custom_field_dtype(blueprint, mytype, 0)
+        assert dt.type == mytype
+        # We cannot (currently) *create* this dtype with `np.dtype` because
+        # mytype does not inherit from `np.generic`.  This seems like an
+        # unnecessary restriction, but one that has been around forever:
+        assert np.dtype(mytype) == np.dtype("O")
+
+        if HAS_REFCOUNT:
+            # Create an array and test that memory gets cleaned up (gh-25949)
+            o = object()
+            a = np.array([o], dtype=dt)
+            del a
+            assert sys.getrefcount(o) == 2
+
+    def test_custom_structured_dtype_errors(self):
+        class mytype:
+            pass
+
+        blueprint = np.dtype([("field", object)])
+
+        with pytest.raises(ValueError):
+            # Tests what happens if fields are unset during creation
+            # which is currently rejected due to the containing object
+            # (see PyArray_RegisterDataType).
+            create_custom_field_dtype(blueprint, mytype, 1)
+
+        with pytest.raises(RuntimeError):
+            # Tests that a dtype must have its type field set up to np.dtype
+            # or in this case a builtin instance.
+            create_custom_field_dtype(blueprint, mytype, 2)
+
+
+class TestClassGetItem:
+    def test_dtype(self) -> None:
+        alias = np.dtype[Any]
+        assert isinstance(alias, types.GenericAlias)
+        assert alias.__origin__ is np.dtype
+
+    @pytest.mark.parametrize("code", np.typecodes["All"])
+    def test_dtype_subclass(self, code: str) -> None:
+        cls = type(np.dtype(code))
+        alias = cls[Any]
+        assert isinstance(alias, types.GenericAlias)
+        assert alias.__origin__ is cls
+
+    @pytest.mark.parametrize("arg_len", range(4))
+    def test_subscript_tuple(self, arg_len: int) -> None:
+        arg_tup = (Any,) * arg_len
+        if arg_len == 1:
+            assert np.dtype[arg_tup]
+        else:
+            with pytest.raises(TypeError):
+                np.dtype[arg_tup]
+
+    def test_subscript_scalar(self) -> None:
+        assert np.dtype[Any]
+
+
+def test_result_type_integers_and_unitless_timedelta64():
+    # Regression test for gh-20077.  The following call of `result_type`
+    # would cause a seg. fault.
+    td = np.timedelta64(4)
+    result = np.result_type(0, td)
+    assert_dtype_equal(result, td.dtype)
+
+
+def test_creating_dtype_with_dtype_class_errors():
+    # Regression test for #25031, calling `np.dtype` with itself segfaulted.
+    with pytest.raises(TypeError, match="Cannot convert np.dtype into a"):
+        np.array(np.ones(10), dtype=np.dtype)

mantis_evalkit/lib/python3.10/site-packages/numpy/_core/tests/test_einsum.py

@@ -0,0 +1,1229 @@
+import itertools
+
+import pytest
+
+import numpy as np
+from numpy.testing import (
+    assert_, assert_equal, assert_array_equal, assert_almost_equal,
+    assert_raises, suppress_warnings, assert_raises_regex, assert_allclose
+    )
+
+# Setup for optimize einsum
+chars = 'abcdefghij'
+sizes = np.array([2, 3, 4, 5, 4, 3, 2, 6, 5, 4, 3])
+global_size_dict = dict(zip(chars, sizes))
+
+
+class TestEinsum:
+    @pytest.mark.parametrize("do_opt", [True, False])
+    @pytest.mark.parametrize("einsum_fn", [np.einsum, np.einsum_path])
+    def test_einsum_errors(self, do_opt, einsum_fn):
+        # Need enough arguments
+        assert_raises(ValueError, einsum_fn, optimize=do_opt)
+        assert_raises(ValueError, einsum_fn, "", optimize=do_opt)
+
+        # subscripts must be a string
+        assert_raises(TypeError, einsum_fn, 0, 0, optimize=do_opt)
+
+        # issue 4528 revealed a segfault with this call
+        assert_raises(TypeError, einsum_fn, *(None,)*63, optimize=do_opt)
+
+        # number of operands must match count in subscripts string
+        assert_raises(ValueError, einsum_fn, "", 0, 0, optimize=do_opt)
+        assert_raises(ValueError, einsum_fn, ",", 0, [0], [0],
+                      optimize=do_opt)
+        assert_raises(ValueError, einsum_fn, ",", [0], optimize=do_opt)
+
+        # can't have more subscripts than dimensions in the operand
+        assert_raises(ValueError, einsum_fn, "i", 0, optimize=do_opt)
+        assert_raises(ValueError, einsum_fn, "ij", [0, 0], optimize=do_opt)
+        assert_raises(ValueError, einsum_fn, "...i", 0, optimize=do_opt)
+        assert_raises(ValueError, einsum_fn, "i...j", [0, 0], optimize=do_opt)
+        assert_raises(ValueError, einsum_fn, "i...", 0, optimize=do_opt)
+        assert_raises(ValueError, einsum_fn, "ij...", [0, 0], optimize=do_opt)
+
+        # invalid ellipsis
+        assert_raises(ValueError, einsum_fn, "i..", [0, 0], optimize=do_opt)
+        assert_raises(ValueError, einsum_fn, ".i...", [0, 0], optimize=do_opt)
+        assert_raises(ValueError, einsum_fn, "j->..j", [0, 0], optimize=do_opt)
+        assert_raises(ValueError, einsum_fn, "j->.j...", [0, 0],
+                      optimize=do_opt)
+
+        # invalid subscript character
+        assert_raises(ValueError, einsum_fn, "i%...", [0, 0], optimize=do_opt)
+        assert_raises(ValueError, einsum_fn, "...j$", [0, 0], optimize=do_opt)
+        assert_raises(ValueError, einsum_fn, "i->&", [0, 0], optimize=do_opt)
+
+        # output subscripts must appear in input
+        assert_raises(ValueError, einsum_fn, "i->ij", [0, 0], optimize=do_opt)
+
+        # output subscripts may only be specified once
+        assert_raises(ValueError, einsum_fn, "ij->jij", [[0, 0], [0, 0]],
+                      optimize=do_opt)
+
+        # dimensions must match when being collapsed
+        assert_raises(ValueError, einsum_fn, "ii",
+                      np.arange(6).reshape(2, 3), optimize=do_opt)
+        assert_raises(ValueError, einsum_fn, "ii->i",
+                      np.arange(6).reshape(2, 3), optimize=do_opt)
+
+        with assert_raises_regex(ValueError, "'b'"):
+            # gh-11221 - 'c' erroneously appeared in the error message
+            a = np.ones((3, 3, 4, 5, 6))
+            b = np.ones((3, 4, 5))
+            einsum_fn('aabcb,abc', a, b)
+
+    @pytest.mark.parametrize("do_opt", [True, False])
+    def test_einsum_specific_errors(self, do_opt):
+        # out parameter must be an array
+        assert_raises(TypeError, np.einsum, "", 0, out='test',
+                      optimize=do_opt)
+
+        # order parameter must be a valid order
+        assert_raises(ValueError, np.einsum, "", 0, order='W',
+                      optimize=do_opt)
+
+        # casting parameter must be a valid casting
+        assert_raises(ValueError, np.einsum, "", 0, casting='blah',
+                      optimize=do_opt)
+
+        # dtype parameter must be a valid dtype
+        assert_raises(TypeError, np.einsum, "", 0, dtype='bad_data_type',
+                      optimize=do_opt)
+
+        # other keyword arguments are rejected
+        assert_raises(TypeError, np.einsum, "", 0, bad_arg=0, optimize=do_opt)
+
+        # broadcasting to new dimensions must be enabled explicitly
+        assert_raises(ValueError, np.einsum, "i", np.arange(6).reshape(2, 3),
+                      optimize=do_opt)
+        assert_raises(ValueError, np.einsum, "i->i", [[0, 1], [0, 1]],
+                      out=np.arange(4).reshape(2, 2), optimize=do_opt)
+
+        # Check order kwarg, asanyarray allows 1d to pass through
+        assert_raises(ValueError, np.einsum, "i->i",
+                      np.arange(6).reshape(-1, 1), optimize=do_opt, order='d')
+
+    def test_einsum_object_errors(self):
+        # Exceptions created by object arithmetic should
+        # successfully propagate
+
+        class CustomException(Exception):
+            pass
+
+        class DestructoBox:
+
+            def __init__(self, value, destruct):
+                self._val = value
+                self._destruct = destruct
+
+            def __add__(self, other):
+                tmp = self._val + other._val
+                if tmp >= self._destruct:
+                    raise CustomException
+                else:
+                    self._val = tmp
+                    return self
+
+            def __radd__(self, other):
+                if other == 0:
+                    return self
+                else:
+                    return self.__add__(other)
+
+            def __mul__(self, other):
+                tmp = self._val * other._val
+                if tmp >= self._destruct:
+                    raise CustomException
+                else:
+                    self._val = tmp
+                    return self
+
+            def __rmul__(self, other):
+                if other == 0:
+                    return self
+                else:
+                    return self.__mul__(other)
+
+        a = np.array([DestructoBox(i, 5) for i in range(1, 10)],
+                     dtype='object').reshape(3, 3)
+
+        # raised from unbuffered_loop_nop1_ndim2
+        assert_raises(CustomException, np.einsum, "ij->i", a)
+
+        # raised from unbuffered_loop_nop1_ndim3
+        b = np.array([DestructoBox(i, 100) for i in range(0, 27)],
+                     dtype='object').reshape(3, 3, 3)
+        assert_raises(CustomException, np.einsum, "i...k->...", b)
+
+        # raised from unbuffered_loop_nop2_ndim2
+        b = np.array([DestructoBox(i, 55) for i in range(1, 4)],
+                     dtype='object')
+        assert_raises(CustomException, np.einsum, "ij, j", a, b)
+
+        # raised from unbuffered_loop_nop2_ndim3
+        assert_raises(CustomException, np.einsum, "ij, jh", a, a)
+
+        # raised from PyArray_EinsteinSum
+        assert_raises(CustomException, np.einsum, "ij->", a)
+
+    def test_einsum_views(self):
+        # pass-through
+        for do_opt in [True, False]:
+            a = np.arange(6)
+            a.shape = (2, 3)
+
+            b = np.einsum("...", a, optimize=do_opt)
+            assert_(b.base is a)
+
+            b = np.einsum(a, [Ellipsis], optimize=do_opt)
+            assert_(b.base is a)
+
+            b = np.einsum("ij", a, optimize=do_opt)
+            assert_(b.base is a)
+            assert_equal(b, a)
+
+            b = np.einsum(a, [0, 1], optimize=do_opt)
+            assert_(b.base is a)
+            assert_equal(b, a)
+
+            # output is writeable whenever input is writeable
+            b = np.einsum("...", a, optimize=do_opt)
+            assert_(b.flags['WRITEABLE'])
+            a.flags['WRITEABLE'] = False
+            b = np.einsum("...", a, optimize=do_opt)
+            assert_(not b.flags['WRITEABLE'])
+
+            # transpose
+            a = np.arange(6)
+            a.shape = (2, 3)
+
+            b = np.einsum("ji", a, optimize=do_opt)
+            assert_(b.base is a)
+            assert_equal(b, a.T)
+
+            b = np.einsum(a, [1, 0], optimize=do_opt)
+            assert_(b.base is a)
+            assert_equal(b, a.T)
+
+            # diagonal
+            a = np.arange(9)
+            a.shape = (3, 3)
+
+            b = np.einsum("ii->i", a, optimize=do_opt)
+            assert_(b.base is a)
+            assert_equal(b, [a[i, i] for i in range(3)])
+
+            b = np.einsum(a, [0, 0], [0], optimize=do_opt)
+            assert_(b.base is a)
+            assert_equal(b, [a[i, i] for i in range(3)])
+
+            # diagonal with various ways of broadcasting an additional dimension
+            a = np.arange(27)
+            a.shape = (3, 3, 3)
+
+            b = np.einsum("...ii->...i", a, optimize=do_opt)
+            assert_(b.base is a)
+            assert_equal(b, [[x[i, i] for i in range(3)] for x in a])
+
+            b = np.einsum(a, [Ellipsis, 0, 0], [Ellipsis, 0], optimize=do_opt)
+            assert_(b.base is a)
+            assert_equal(b, [[x[i, i] for i in range(3)] for x in a])
+
+            b = np.einsum("ii...->...i", a, optimize=do_opt)
+            assert_(b.base is a)
+            assert_equal(b, [[x[i, i] for i in range(3)]
+                             for x in a.transpose(2, 0, 1)])
+
+            b = np.einsum(a, [0, 0, Ellipsis], [Ellipsis, 0], optimize=do_opt)
+            assert_(b.base is a)
+            assert_equal(b, [[x[i, i] for i in range(3)]
+                             for x in a.transpose(2, 0, 1)])
+
+            b = np.einsum("...ii->i...", a, optimize=do_opt)
+            assert_(b.base is a)
+            assert_equal(b, [a[:, i, i] for i in range(3)])
+
+            b = np.einsum(a, [Ellipsis, 0, 0], [0, Ellipsis], optimize=do_opt)
+            assert_(b.base is a)
+            assert_equal(b, [a[:, i, i] for i in range(3)])
+
+            b = np.einsum("jii->ij", a, optimize=do_opt)
+            assert_(b.base is a)
+            assert_equal(b, [a[:, i, i] for i in range(3)])
+
+            b = np.einsum(a, [1, 0, 0], [0, 1], optimize=do_opt)
+            assert_(b.base is a)
+            assert_equal(b, [a[:, i, i] for i in range(3)])
+
+            b = np.einsum("ii...->i...", a, optimize=do_opt)
+            assert_(b.base is a)
+            assert_equal(b, [a.transpose(2, 0, 1)[:, i, i] for i in range(3)])
+
+            b = np.einsum(a, [0, 0, Ellipsis], [0, Ellipsis], optimize=do_opt)
+            assert_(b.base is a)
+            assert_equal(b, [a.transpose(2, 0, 1)[:, i, i] for i in range(3)])
+
+            b = np.einsum("i...i->i...", a, optimize=do_opt)
+            assert_(b.base is a)
+            assert_equal(b, [a.transpose(1, 0, 2)[:, i, i] for i in range(3)])
+
+            b = np.einsum(a, [0, Ellipsis, 0], [0, Ellipsis], optimize=do_opt)
+            assert_(b.base is a)
+            assert_equal(b, [a.transpose(1, 0, 2)[:, i, i] for i in range(3)])
+
+            b = np.einsum("i...i->...i", a, optimize=do_opt)
+            assert_(b.base is a)
+            assert_equal(b, [[x[i, i] for i in range(3)]
+                             for x in a.transpose(1, 0, 2)])
+
+            b = np.einsum(a, [0, Ellipsis, 0], [Ellipsis, 0], optimize=do_opt)
+            assert_(b.base is a)
+            assert_equal(b, [[x[i, i] for i in range(3)]
+                             for x in a.transpose(1, 0, 2)])
+
+            # triple diagonal
+            a = np.arange(27)
+            a.shape = (3, 3, 3)
+
+            b = np.einsum("iii->i", a, optimize=do_opt)
+            assert_(b.base is a)
+            assert_equal(b, [a[i, i, i] for i in range(3)])
+
+            b = np.einsum(a, [0, 0, 0], [0], optimize=do_opt)
+            assert_(b.base is a)
+            assert_equal(b, [a[i, i, i] for i in range(3)])
+
+            # swap axes
+            a = np.arange(24)
+            a.shape = (2, 3, 4)
+
+            b = np.einsum("ijk->jik", a, optimize=do_opt)
+            assert_(b.base is a)
+            assert_equal(b, a.swapaxes(0, 1))
+
+            b = np.einsum(a, [0, 1, 2], [1, 0, 2], optimize=do_opt)
+            assert_(b.base is a)
+            assert_equal(b, a.swapaxes(0, 1))
+
+    def check_einsum_sums(self, dtype, do_opt=False):
+        dtype = np.dtype(dtype)
+        # Check various sums.  Does many sizes to exercise unrolled loops.
+
+        # sum(a, axis=-1)
+        for n in range(1, 17):
+            a = np.arange(n, dtype=dtype)
+            b = np.sum(a, axis=-1)
+            if hasattr(b, 'astype'):
+                b = b.astype(dtype)
+            assert_equal(np.einsum("i->", a, optimize=do_opt), b)
+            assert_equal(np.einsum(a, [0], [], optimize=do_opt), b)
+
+        for n in range(1, 17):
+            a = np.arange(2*3*n, dtype=dtype).reshape(2, 3, n)
+            b = np.sum(a, axis=-1)
+            if hasattr(b, 'astype'):
+                b = b.astype(dtype)
+            assert_equal(np.einsum("...i->...", a, optimize=do_opt), b)
+            assert_equal(np.einsum(a, [Ellipsis, 0], [Ellipsis], optimize=do_opt), b)
+
+        # sum(a, axis=0)
+        for n in range(1, 17):
+            a = np.arange(2*n, dtype=dtype).reshape(2, n)
+            b = np.sum(a, axis=0)
+            if hasattr(b, 'astype'):
+                b = b.astype(dtype)
+            assert_equal(np.einsum("i...->...", a, optimize=do_opt), b)
+            assert_equal(np.einsum(a, [0, Ellipsis], [Ellipsis], optimize=do_opt), b)
+
+        for n in range(1, 17):
+            a = np.arange(2*3*n, dtype=dtype).reshape(2, 3, n)
+            b = np.sum(a, axis=0)
+            if hasattr(b, 'astype'):
+                b = b.astype(dtype)
+            assert_equal(np.einsum("i...->...", a, optimize=do_opt), b)
+            assert_equal(np.einsum(a, [0, Ellipsis], [Ellipsis], optimize=do_opt), b)
+
+        # trace(a)
+        for n in range(1, 17):
+            a = np.arange(n*n, dtype=dtype).reshape(n, n)
+            b = np.trace(a)
+            if hasattr(b, 'astype'):
+                b = b.astype(dtype)
+            assert_equal(np.einsum("ii", a, optimize=do_opt), b)
+            assert_equal(np.einsum(a, [0, 0], optimize=do_opt), b)
+
+            # gh-15961: should accept numpy int64 type in subscript list
+            np_array = np.asarray([0, 0])
+            assert_equal(np.einsum(a, np_array, optimize=do_opt), b)
+            assert_equal(np.einsum(a, list(np_array), optimize=do_opt), b)
+
+        # multiply(a, b)
+        assert_equal(np.einsum("..., ...", 3, 4), 12)  # scalar case
+        for n in range(1, 17):
+            a = np.arange(3 * n, dtype=dtype).reshape(3, n)
+            b = np.arange(2 * 3 * n, dtype=dtype).reshape(2, 3, n)
+            assert_equal(np.einsum("..., ...", a, b, optimize=do_opt),
+                         np.multiply(a, b))
+            assert_equal(np.einsum(a, [Ellipsis], b, [Ellipsis], optimize=do_opt),
+                         np.multiply(a, b))
+
+        # inner(a,b)
+        for n in range(1, 17):
+            a = np.arange(2 * 3 * n, dtype=dtype).reshape(2, 3, n)
+            b = np.arange(n, dtype=dtype)
+            assert_equal(np.einsum("...i, ...i", a, b, optimize=do_opt), np.inner(a, b))
+            assert_equal(np.einsum(a, [Ellipsis, 0], b, [Ellipsis, 0], optimize=do_opt),
+                         np.inner(a, b))
+
+        for n in range(1, 11):
+            a = np.arange(n * 3 * 2, dtype=dtype).reshape(n, 3, 2)
+            b = np.arange(n, dtype=dtype)
+            assert_equal(np.einsum("i..., i...", a, b, optimize=do_opt),
+                         np.inner(a.T, b.T).T)
+            assert_equal(np.einsum(a, [0, Ellipsis], b, [0, Ellipsis], optimize=do_opt),
+                         np.inner(a.T, b.T).T)
+
+        # outer(a,b)
+        for n in range(1, 17):
+            a = np.arange(3, dtype=dtype)+1
+            b = np.arange(n, dtype=dtype)+1
+            assert_equal(np.einsum("i,j", a, b, optimize=do_opt),
+                         np.outer(a, b))
+            assert_equal(np.einsum(a, [0], b, [1], optimize=do_opt),
+                         np.outer(a, b))
+
+        # Suppress the complex warnings for the 'as f8' tests
+        with suppress_warnings() as sup:
+            sup.filter(np.exceptions.ComplexWarning)
+
+            # matvec(a,b) / a.dot(b) where a is matrix, b is vector
+            for n in range(1, 17):
+                a = np.arange(4*n, dtype=dtype).reshape(4, n)
+                b = np.arange(n, dtype=dtype)
+                assert_equal(np.einsum("ij, j", a, b, optimize=do_opt),
+                             np.dot(a, b))
+                assert_equal(np.einsum(a, [0, 1], b, [1], optimize=do_opt),
+                             np.dot(a, b))
+
+                c = np.arange(4, dtype=dtype)
+                np.einsum("ij,j", a, b, out=c,
+                          dtype='f8', casting='unsafe', optimize=do_opt)
+                assert_equal(c,
+                             np.dot(a.astype('f8'),
+                                    b.astype('f8')).astype(dtype))
+                c[...] = 0
+                np.einsum(a, [0, 1], b, [1], out=c,
+                          dtype='f8', casting='unsafe', optimize=do_opt)
+                assert_equal(c,
+                             np.dot(a.astype('f8'),
+                                    b.astype('f8')).astype(dtype))
+
+            for n in range(1, 17):
+                a = np.arange(4*n, dtype=dtype).reshape(4, n)
+                b = np.arange(n, dtype=dtype)
+                assert_equal(np.einsum("ji,j", a.T, b.T, optimize=do_opt),
+                             np.dot(b.T, a.T))
+                assert_equal(np.einsum(a.T, [1, 0], b.T, [1], optimize=do_opt),
+                             np.dot(b.T, a.T))
+
+                c = np.arange(4, dtype=dtype)
+                np.einsum("ji,j", a.T, b.T, out=c,
+                          dtype='f8', casting='unsafe', optimize=do_opt)
+                assert_equal(c,
+                             np.dot(b.T.astype('f8'),
+                                    a.T.astype('f8')).astype(dtype))
+                c[...] = 0
+                np.einsum(a.T, [1, 0], b.T, [1], out=c,
+                          dtype='f8', casting='unsafe', optimize=do_opt)
+                assert_equal(c,
+                             np.dot(b.T.astype('f8'),
+                                    a.T.astype('f8')).astype(dtype))
+
+            # matmat(a,b) / a.dot(b) where a is matrix, b is matrix
+            for n in range(1, 17):
+                if n < 8 or dtype != 'f2':
+                    a = np.arange(4*n, dtype=dtype).reshape(4, n)
+                    b = np.arange(n*6, dtype=dtype).reshape(n, 6)
+                    assert_equal(np.einsum("ij,jk", a, b, optimize=do_opt),
+                                 np.dot(a, b))
+                    assert_equal(np.einsum(a, [0, 1], b, [1, 2], optimize=do_opt),
+                                 np.dot(a, b))
+
+            for n in range(1, 17):
+                a = np.arange(4*n, dtype=dtype).reshape(4, n)
+                b = np.arange(n*6, dtype=dtype).reshape(n, 6)
+                c = np.arange(24, dtype=dtype).reshape(4, 6)
+                np.einsum("ij,jk", a, b, out=c, dtype='f8', casting='unsafe',
+                          optimize=do_opt)
+                assert_equal(c,
+                             np.dot(a.astype('f8'),
+                                    b.astype('f8')).astype(dtype))
+                c[...] = 0
+                np.einsum(a, [0, 1], b, [1, 2], out=c,
+                          dtype='f8', casting='unsafe', optimize=do_opt)
+                assert_equal(c,
+                             np.dot(a.astype('f8'),
+                                    b.astype('f8')).astype(dtype))
+
+            # matrix triple product (note this is not currently an efficient
+            # way to multiply 3 matrices)
+            a = np.arange(12, dtype=dtype).reshape(3, 4)
+            b = np.arange(20, dtype=dtype).reshape(4, 5)
+            c = np.arange(30, dtype=dtype).reshape(5, 6)
+            if dtype != 'f2':
+                assert_equal(np.einsum("ij,jk,kl", a, b, c, optimize=do_opt),
+                             a.dot(b).dot(c))
+                assert_equal(np.einsum(a, [0, 1], b, [1, 2], c, [2, 3],
+                                       optimize=do_opt), a.dot(b).dot(c))
+
+            d = np.arange(18, dtype=dtype).reshape(3, 6)
+            np.einsum("ij,jk,kl", a, b, c, out=d,
+                      dtype='f8', casting='unsafe', optimize=do_opt)
+            tgt = a.astype('f8').dot(b.astype('f8'))
+            tgt = tgt.dot(c.astype('f8')).astype(dtype)
+            assert_equal(d, tgt)
+
+            d[...] = 0
+            np.einsum(a, [0, 1], b, [1, 2], c, [2, 3], out=d,
+                      dtype='f8', casting='unsafe', optimize=do_opt)
+            tgt = a.astype('f8').dot(b.astype('f8'))
+            tgt = tgt.dot(c.astype('f8')).astype(dtype)
+            assert_equal(d, tgt)
+
+            # tensordot(a, b)
+            if np.dtype(dtype) != np.dtype('f2'):
+                a = np.arange(60, dtype=dtype).reshape(3, 4, 5)
+                b = np.arange(24, dtype=dtype).reshape(4, 3, 2)
+                assert_equal(np.einsum("ijk, jil -> kl", a, b),
+                             np.tensordot(a, b, axes=([1, 0], [0, 1])))
+                assert_equal(np.einsum(a, [0, 1, 2], b, [1, 0, 3], [2, 3]),
+                             np.tensordot(a, b, axes=([1, 0], [0, 1])))
+
+                c = np.arange(10, dtype=dtype).reshape(5, 2)
+                np.einsum("ijk,jil->kl", a, b, out=c,
+                          dtype='f8', casting='unsafe', optimize=do_opt)
+                assert_equal(c, np.tensordot(a.astype('f8'), b.astype('f8'),
+                             axes=([1, 0], [0, 1])).astype(dtype))
+                c[...] = 0
+                np.einsum(a, [0, 1, 2], b, [1, 0, 3], [2, 3], out=c,
+                          dtype='f8', casting='unsafe', optimize=do_opt)
+                assert_equal(c, np.tensordot(a.astype('f8'), b.astype('f8'),
+                             axes=([1, 0], [0, 1])).astype(dtype))
+
+        # logical_and(logical_and(a!=0, b!=0), c!=0)
+        neg_val = -2 if dtype.kind != "u" else np.iinfo(dtype).max - 1
+        a = np.array([1,   3,   neg_val, 0,  12,  13,   0,   1], dtype=dtype)
+        b = np.array([0,   3.5, 0., neg_val,  0,   1,    3,   12], dtype=dtype)
+        c = np.array([True, True, False, True, True, False, True, True])
+
+        assert_equal(np.einsum("i,i,i->i", a, b, c,
+                     dtype='?', casting='unsafe', optimize=do_opt),
+                     np.logical_and(np.logical_and(a != 0, b != 0), c != 0))
+        assert_equal(np.einsum(a, [0], b, [0], c, [0], [0],
+                     dtype='?', casting='unsafe'),
+                     np.logical_and(np.logical_and(a != 0, b != 0), c != 0))
+
+        a = np.arange(9, dtype=dtype)
+        assert_equal(np.einsum(",i->", 3, a), 3*np.sum(a))
+        assert_equal(np.einsum(3, [], a, [0], []), 3*np.sum(a))
+        assert_equal(np.einsum("i,->", a, 3), 3*np.sum(a))
+        assert_equal(np.einsum(a, [0], 3, [], []), 3*np.sum(a))
+
+        # Various stride0, contiguous, and SSE aligned variants
+        for n in range(1, 25):
+            a = np.arange(n, dtype=dtype)
+            if np.dtype(dtype).itemsize > 1:
+                assert_equal(np.einsum("...,...", a, a, optimize=do_opt),
+                             np.multiply(a, a))
+                assert_equal(np.einsum("i,i", a, a, optimize=do_opt), np.dot(a, a))
+                assert_equal(np.einsum("i,->i", a, 2, optimize=do_opt), 2*a)
+                assert_equal(np.einsum(",i->i", 2, a, optimize=do_opt), 2*a)
+                assert_equal(np.einsum("i,->", a, 2, optimize=do_opt), 2*np.sum(a))
+                assert_equal(np.einsum(",i->", 2, a, optimize=do_opt), 2*np.sum(a))
+
+                assert_equal(np.einsum("...,...", a[1:], a[:-1], optimize=do_opt),
+                             np.multiply(a[1:], a[:-1]))
+                assert_equal(np.einsum("i,i", a[1:], a[:-1], optimize=do_opt),
+                             np.dot(a[1:], a[:-1]))
+                assert_equal(np.einsum("i,->i", a[1:], 2, optimize=do_opt), 2*a[1:])
+                assert_equal(np.einsum(",i->i", 2, a[1:], optimize=do_opt), 2*a[1:])
+                assert_equal(np.einsum("i,->", a[1:], 2, optimize=do_opt),
+                             2*np.sum(a[1:]))
+                assert_equal(np.einsum(",i->", 2, a[1:], optimize=do_opt),
+                             2*np.sum(a[1:]))
+
+        # An object array, summed as the data type
+        a = np.arange(9, dtype=object)
+
+        b = np.einsum("i->", a, dtype=dtype, casting='unsafe')
+        assert_equal(b, np.sum(a))
+        if hasattr(b, "dtype"):
+            # Can be a python object when dtype is object
+            assert_equal(b.dtype, np.dtype(dtype))
+
+        b = np.einsum(a, [0], [], dtype=dtype, casting='unsafe')
+        assert_equal(b, np.sum(a))
+        if hasattr(b, "dtype"):
+            # Can be a python object when dtype is object
+            assert_equal(b.dtype, np.dtype(dtype))
+
+        # A case which was failing (ticket #1885)
+        p = np.arange(2) + 1
+        q = np.arange(4).reshape(2, 2) + 3
+        r = np.arange(4).reshape(2, 2) + 7
+        assert_equal(np.einsum('z,mz,zm->', p, q, r), 253)
+
+        # singleton dimensions broadcast (gh-10343)
+        p = np.ones((10,2))
+        q = np.ones((1,2))
+        assert_array_equal(np.einsum('ij,ij->j', p, q, optimize=True),
+                           np.einsum('ij,ij->j', p, q, optimize=False))
+        assert_array_equal(np.einsum('ij,ij->j', p, q, optimize=True),
+                           [10.] * 2)
+
+        # a blas-compatible contraction broadcasting case which was failing
+        # for optimize=True (ticket #10930)
+        x = np.array([2., 3.])
+        y = np.array([4.])
+        assert_array_equal(np.einsum("i, i", x, y, optimize=False), 20.)
+        assert_array_equal(np.einsum("i, i", x, y, optimize=True), 20.)
+
+        # all-ones array was bypassing bug (ticket #10930)
+        p = np.ones((1, 5)) / 2
+        q = np.ones((5, 5)) / 2
+        for optimize in (True, False):
+            assert_array_equal(np.einsum("...ij,...jk->...ik", p, p,
+                                         optimize=optimize),
+                               np.einsum("...ij,...jk->...ik", p, q,
+                                         optimize=optimize))
+            assert_array_equal(np.einsum("...ij,...jk->...ik", p, q,
+                                         optimize=optimize),
+                               np.full((1, 5), 1.25))
+
+        # Cases which were failing (gh-10899)
+        x = np.eye(2, dtype=dtype)
+        y = np.ones(2, dtype=dtype)
+        assert_array_equal(np.einsum("ji,i->", x, y, optimize=optimize),
+                           [2.])  # contig_contig_outstride0_two
+        assert_array_equal(np.einsum("i,ij->", y, x, optimize=optimize),
+                           [2.])  # stride0_contig_outstride0_two
+        assert_array_equal(np.einsum("ij,i->", x, y, optimize=optimize),
+                           [2.])  # contig_stride0_outstride0_two
+
+    def test_einsum_sums_int8(self):
+        self.check_einsum_sums('i1')
+
+    def test_einsum_sums_uint8(self):
+        self.check_einsum_sums('u1')
+
+    def test_einsum_sums_int16(self):
+        self.check_einsum_sums('i2')
+
+    def test_einsum_sums_uint16(self):
+        self.check_einsum_sums('u2')
+
+    def test_einsum_sums_int32(self):
+        self.check_einsum_sums('i4')
+        self.check_einsum_sums('i4', True)
+
+    def test_einsum_sums_uint32(self):
+        self.check_einsum_sums('u4')
+        self.check_einsum_sums('u4', True)
+
+    def test_einsum_sums_int64(self):
+        self.check_einsum_sums('i8')
+
+    def test_einsum_sums_uint64(self):
+        self.check_einsum_sums('u8')
+
+    def test_einsum_sums_float16(self):
+        self.check_einsum_sums('f2')
+
+    def test_einsum_sums_float32(self):
+        self.check_einsum_sums('f4')
+
+    def test_einsum_sums_float64(self):
+        self.check_einsum_sums('f8')
+        self.check_einsum_sums('f8', True)
+
+    def test_einsum_sums_longdouble(self):
+        self.check_einsum_sums(np.longdouble)
+
+    def test_einsum_sums_cfloat64(self):
+        self.check_einsum_sums('c8')
+        self.check_einsum_sums('c8', True)
+
+    def test_einsum_sums_cfloat128(self):
+        self.check_einsum_sums('c16')
+
+    def test_einsum_sums_clongdouble(self):
+        self.check_einsum_sums(np.clongdouble)
+
+    def test_einsum_sums_object(self):
+        self.check_einsum_sums('object')
+        self.check_einsum_sums('object', True)
+
+    def test_einsum_misc(self):
+        # This call used to crash because of a bug in
+        # PyArray_AssignZero
+        a = np.ones((1, 2))
+        b = np.ones((2, 2, 1))
+        assert_equal(np.einsum('ij...,j...->i...', a, b), [[[2], [2]]])
+        assert_equal(np.einsum('ij...,j...->i...', a, b, optimize=True), [[[2], [2]]])
+
+        # Regression test for issue #10369 (test unicode inputs with Python 2)
+        assert_equal(np.einsum('ij...,j...->i...', a, b), [[[2], [2]]])
+        assert_equal(np.einsum('...i,...i', [1, 2, 3], [2, 3, 4]), 20)
+        assert_equal(np.einsum('...i,...i', [1, 2, 3], [2, 3, 4],
+                               optimize='greedy'), 20)
+
+        # The iterator had an issue with buffering this reduction
+        a = np.ones((5, 12, 4, 2, 3), np.int64)
+        b = np.ones((5, 12, 11), np.int64)
+        assert_equal(np.einsum('ijklm,ijn,ijn->', a, b, b),
+                     np.einsum('ijklm,ijn->', a, b))
+        assert_equal(np.einsum('ijklm,ijn,ijn->', a, b, b, optimize=True),
+                     np.einsum('ijklm,ijn->', a, b, optimize=True))
+
+        # Issue #2027, was a problem in the contiguous 3-argument
+        # inner loop implementation
+        a = np.arange(1, 3)
+        b = np.arange(1, 5).reshape(2, 2)
+        c = np.arange(1, 9).reshape(4, 2)
+        assert_equal(np.einsum('x,yx,zx->xzy', a, b, c),
+                     [[[1,  3], [3,  9], [5, 15], [7, 21]],
+                     [[8, 16], [16, 32], [24, 48], [32, 64]]])
+        assert_equal(np.einsum('x,yx,zx->xzy', a, b, c, optimize=True),
+                     [[[1,  3], [3,  9], [5, 15], [7, 21]],
+                     [[8, 16], [16, 32], [24, 48], [32, 64]]])
+
+        # Ensure explicitly setting out=None does not cause an error
+        # see issue gh-15776 and issue gh-15256
+        assert_equal(np.einsum('i,j', [1], [2], out=None), [[2]])
+
+    def test_object_loop(self):
+
+        class Mult:
+            def __mul__(self, other):
+                return 42
+
+        objMult = np.array([Mult()])
+        objNULL = np.ndarray(buffer = b'\0' * np.intp(0).itemsize, shape=1, dtype=object)
+
+        with pytest.raises(TypeError):
+            np.einsum("i,j", [1], objNULL)
+        with pytest.raises(TypeError):
+            np.einsum("i,j", objNULL, [1])
+        assert np.einsum("i,j", objMult, objMult) == 42
+
+    def test_subscript_range(self):
+        # Issue #7741, make sure that all letters of Latin alphabet (both uppercase & lowercase) can be used
+        # when creating a subscript from arrays
+        a = np.ones((2, 3))
+        b = np.ones((3, 4))
+        np.einsum(a, [0, 20], b, [20, 2], [0, 2], optimize=False)
+        np.einsum(a, [0, 27], b, [27, 2], [0, 2], optimize=False)
+        np.einsum(a, [0, 51], b, [51, 2], [0, 2], optimize=False)
+        assert_raises(ValueError, lambda: np.einsum(a, [0, 52], b, [52, 2], [0, 2], optimize=False))
+        assert_raises(ValueError, lambda: np.einsum(a, [-1, 5], b, [5, 2], [-1, 2], optimize=False))
+
+    def test_einsum_broadcast(self):
+        # Issue #2455 change in handling ellipsis
+        # remove the 'middle broadcast' error
+        # only use the 'RIGHT' iteration in prepare_op_axes
+        # adds auto broadcast on left where it belongs
+        # broadcast on right has to be explicit
+        # We need to test the optimized parsing as well
+
+        A = np.arange(2 * 3 * 4).reshape(2, 3, 4)
+        B = np.arange(3)
+        ref = np.einsum('ijk,j->ijk', A, B, optimize=False)
+        for opt in [True, False]:
+            assert_equal(np.einsum('ij...,j...->ij...', A, B, optimize=opt), ref)
+            assert_equal(np.einsum('ij...,...j->ij...', A, B, optimize=opt), ref)
+            assert_equal(np.einsum('ij...,j->ij...', A, B, optimize=opt), ref)  # used to raise error
+
+        A = np.arange(12).reshape((4, 3))
+        B = np.arange(6).reshape((3, 2))
+        ref = np.einsum('ik,kj->ij', A, B, optimize=False)
+        for opt in [True, False]:
+            assert_equal(np.einsum('ik...,k...->i...', A, B, optimize=opt), ref)
+            assert_equal(np.einsum('ik...,...kj->i...j', A, B, optimize=opt), ref)
+            assert_equal(np.einsum('...k,kj', A, B, optimize=opt), ref)  # used to raise error
+            assert_equal(np.einsum('ik,k...->i...', A, B, optimize=opt), ref)  # used to raise error
+
+        dims = [2, 3, 4, 5]
+        a = np.arange(np.prod(dims)).reshape(dims)
+        v = np.arange(dims[2])
+        ref = np.einsum('ijkl,k->ijl', a, v, optimize=False)
+        for opt in [True, False]:
+            assert_equal(np.einsum('ijkl,k', a, v, optimize=opt), ref)
+            assert_equal(np.einsum('...kl,k', a, v, optimize=opt), ref)  # used to raise error
+            assert_equal(np.einsum('...kl,k...', a, v, optimize=opt), ref)
+
+        J, K, M = 160, 160, 120
+        A = np.arange(J * K * M).reshape(1, 1, 1, J, K, M)
+        B = np.arange(J * K * M * 3).reshape(J, K, M, 3)
+        ref = np.einsum('...lmn,...lmno->...o', A, B, optimize=False)
+        for opt in [True, False]:
+            assert_equal(np.einsum('...lmn,lmno->...o', A, B,
+                                   optimize=opt), ref)  # used to raise error
+
+    def test_einsum_fixedstridebug(self):
+        # Issue #4485 obscure einsum bug
+        # This case revealed a bug in nditer where it reported a stride
+        # as 'fixed' (0) when it was in fact not fixed during processing
+        # (0 or 4). The reason for the bug was that the check for a fixed
+        # stride was using the information from the 2D inner loop reuse
+        # to restrict the iteration dimensions it had to validate to be
+        # the same, but that 2D inner loop reuse logic is only triggered
+        # during the buffer copying step, and hence it was invalid to
+        # rely on those values. The fix is to check all the dimensions
+        # of the stride in question, which in the test case reveals that
+        # the stride is not fixed.
+        #
+        # NOTE: This test is triggered by the fact that the default buffersize,
+        #       used by einsum, is 8192, and 3*2731 = 8193, is larger than that
+        #       and results in a mismatch between the buffering and the
+        #       striding for operand A.
+        A = np.arange(2 * 3).reshape(2, 3).astype(np.float32)
+        B = np.arange(2 * 3 * 2731).reshape(2, 3, 2731).astype(np.int16)
+        es = np.einsum('cl, cpx->lpx',  A,  B)
+        tp = np.tensordot(A,  B,  axes=(0,  0))
+        assert_equal(es,  tp)
+        # The following is the original test case from the bug report,
+        # made repeatable by changing random arrays to aranges.
+        A = np.arange(3 * 3).reshape(3, 3).astype(np.float64)
+        B = np.arange(3 * 3 * 64 * 64).reshape(3, 3, 64, 64).astype(np.float32)
+        es = np.einsum('cl, cpxy->lpxy',  A, B)
+        tp = np.tensordot(A, B,  axes=(0, 0))
+        assert_equal(es, tp)
+
+    def test_einsum_fixed_collapsingbug(self):
+        # Issue #5147.
+        # The bug only occurred when output argument of einssum was used.
+        x = np.random.normal(0, 1, (5, 5, 5, 5))
+        y1 = np.zeros((5, 5))
+        np.einsum('aabb->ab', x, out=y1)
+        idx = np.arange(5)
+        y2 = x[idx[:, None], idx[:, None], idx, idx]
+        assert_equal(y1, y2)
+
+    def test_einsum_failed_on_p9_and_s390x(self):
+        # Issues gh-14692 and gh-12689
+        # Bug with signed vs unsigned char errored on power9 and s390x Linux
+        tensor = np.random.random_sample((10, 10, 10, 10))
+        x = np.einsum('ijij->', tensor)
+        y = tensor.trace(axis1=0, axis2=2).trace()
+        assert_allclose(x, y)
+
+    def test_einsum_all_contig_non_contig_output(self):
+        # Issue gh-5907, tests that the all contiguous special case
+        # actually checks the contiguity of the output
+        x = np.ones((5, 5))
+        out = np.ones(10)[::2]
+        correct_base = np.ones(10)
+        correct_base[::2] = 5
+        # Always worked (inner iteration is done with 0-stride):
+        np.einsum('mi,mi,mi->m', x, x, x, out=out)
+        assert_array_equal(out.base, correct_base)
+        # Example 1:
+        out = np.ones(10)[::2]
+        np.einsum('im,im,im->m', x, x, x, out=out)
+        assert_array_equal(out.base, correct_base)
+        # Example 2, buffering causes x to be contiguous but
+        # special cases do not catch the operation before:
+        out = np.ones((2, 2, 2))[..., 0]
+        correct_base = np.ones((2, 2, 2))
+        correct_base[..., 0] = 2
+        x = np.ones((2, 2), np.float32)
+        np.einsum('ij,jk->ik', x, x, out=out)
+        assert_array_equal(out.base, correct_base)
+
+    @pytest.mark.parametrize("dtype",
+             np.typecodes["AllFloat"] + np.typecodes["AllInteger"])
+    def test_different_paths(self, dtype):
+        # Test originally added to cover broken float16 path: gh-20305
+        # Likely most are covered elsewhere, at least partially.
+        dtype = np.dtype(dtype)
+        # Simple test, designed to exercise most specialized code paths,
+        # note the +0.5 for floats.  This makes sure we use a float value
+        # where the results must be exact.
+        arr = (np.arange(7) + 0.5).astype(dtype)
+        scalar = np.array(2, dtype=dtype)
+
+        # contig -> scalar:
+        res = np.einsum('i->', arr)
+        assert res == arr.sum()
+        # contig, contig -> contig:
+        res = np.einsum('i,i->i', arr, arr)
+        assert_array_equal(res, arr * arr)
+        # noncontig, noncontig -> contig:
+        res = np.einsum('i,i->i', arr.repeat(2)[::2], arr.repeat(2)[::2])
+        assert_array_equal(res, arr * arr)
+        # contig + contig -> scalar
+        assert np.einsum('i,i->', arr, arr) == (arr * arr).sum()
+        # contig + scalar -> contig (with out)
+        out = np.ones(7, dtype=dtype)
+        res = np.einsum('i,->i', arr, dtype.type(2), out=out)
+        assert_array_equal(res, arr * dtype.type(2))
+        # scalar + contig -> contig (with out)
+        res = np.einsum(',i->i', scalar, arr)
+        assert_array_equal(res, arr * dtype.type(2))
+        # scalar + contig -> scalar
+        res = np.einsum(',i->', scalar, arr)
+        # Use einsum to compare to not have difference due to sum round-offs:
+        assert res == np.einsum('i->', scalar * arr)
+        # contig + scalar -> scalar
+        res = np.einsum('i,->', arr, scalar)
+        # Use einsum to compare to not have difference due to sum round-offs:
+        assert res == np.einsum('i->', scalar * arr)
+        # contig + contig + contig -> scalar
+        arr = np.array([0.5, 0.5, 0.25, 4.5, 3.], dtype=dtype)
+        res = np.einsum('i,i,i->', arr, arr, arr)
+        assert_array_equal(res, (arr * arr * arr).sum())
+        # four arrays:
+        res = np.einsum('i,i,i,i->', arr, arr, arr, arr)
+        assert_array_equal(res, (arr * arr * arr * arr).sum())
+
+    def test_small_boolean_arrays(self):
+        # See gh-5946.
+        # Use array of True embedded in False.
+        a = np.zeros((16, 1, 1), dtype=np.bool)[:2]
+        a[...] = True
+        out = np.zeros((16, 1, 1), dtype=np.bool)[:2]
+        tgt = np.ones((2, 1, 1), dtype=np.bool)
+        res = np.einsum('...ij,...jk->...ik', a, a, out=out)
+        assert_equal(res, tgt)
+
+    def test_out_is_res(self):
+        a = np.arange(9).reshape(3, 3)
+        res = np.einsum('...ij,...jk->...ik', a, a, out=a)
+        assert res is a
+
+    def optimize_compare(self, subscripts, operands=None):
+        # Tests all paths of the optimization function against
+        # conventional einsum
+        if operands is None:
+            args = [subscripts]
+            terms = subscripts.split('->')[0].split(',')
+            for term in terms:
+                dims = [global_size_dict[x] for x in term]
+                args.append(np.random.rand(*dims))
+        else:
+            args = [subscripts] + operands
+
+        noopt = np.einsum(*args, optimize=False)
+        opt = np.einsum(*args, optimize='greedy')
+        assert_almost_equal(opt, noopt)
+        opt = np.einsum(*args, optimize='optimal')
+        assert_almost_equal(opt, noopt)
+
+    def test_hadamard_like_products(self):
+        # Hadamard outer products
+        self.optimize_compare('a,ab,abc->abc')
+        self.optimize_compare('a,b,ab->ab')
+
+    def test_index_transformations(self):
+        # Simple index transformation cases
+        self.optimize_compare('ea,fb,gc,hd,abcd->efgh')
+        self.optimize_compare('ea,fb,abcd,gc,hd->efgh')
+        self.optimize_compare('abcd,ea,fb,gc,hd->efgh')
+
+    def test_complex(self):
+        # Long test cases
+        self.optimize_compare('acdf,jbje,gihb,hfac,gfac,gifabc,hfac')
+        self.optimize_compare('acdf,jbje,gihb,hfac,gfac,gifabc,hfac')
+        self.optimize_compare('cd,bdhe,aidb,hgca,gc,hgibcd,hgac')
+        self.optimize_compare('abhe,hidj,jgba,hiab,gab')
+        self.optimize_compare('bde,cdh,agdb,hica,ibd,hgicd,hiac')
+        self.optimize_compare('chd,bde,agbc,hiad,hgc,hgi,hiad')
+        self.optimize_compare('chd,bde,agbc,hiad,bdi,cgh,agdb')
+        self.optimize_compare('bdhe,acad,hiab,agac,hibd')
+
+    def test_collapse(self):
+        # Inner products
+        self.optimize_compare('ab,ab,c->')
+        self.optimize_compare('ab,ab,c->c')
+        self.optimize_compare('ab,ab,cd,cd->')
+        self.optimize_compare('ab,ab,cd,cd->ac')
+        self.optimize_compare('ab,ab,cd,cd->cd')
+        self.optimize_compare('ab,ab,cd,cd,ef,ef->')
+
+    def test_expand(self):
+        # Outer products
+        self.optimize_compare('ab,cd,ef->abcdef')
+        self.optimize_compare('ab,cd,ef->acdf')
+        self.optimize_compare('ab,cd,de->abcde')
+        self.optimize_compare('ab,cd,de->be')
+        self.optimize_compare('ab,bcd,cd->abcd')
+        self.optimize_compare('ab,bcd,cd->abd')
+
+    def test_edge_cases(self):
+        # Difficult edge cases for optimization
+        self.optimize_compare('eb,cb,fb->cef')
+        self.optimize_compare('dd,fb,be,cdb->cef')
+        self.optimize_compare('bca,cdb,dbf,afc->')
+        self.optimize_compare('dcc,fce,ea,dbf->ab')
+        self.optimize_compare('fdf,cdd,ccd,afe->ae')
+        self.optimize_compare('abcd,ad')
+        self.optimize_compare('ed,fcd,ff,bcf->be')
+        self.optimize_compare('baa,dcf,af,cde->be')
+        self.optimize_compare('bd,db,eac->ace')
+        self.optimize_compare('fff,fae,bef,def->abd')
+        self.optimize_compare('efc,dbc,acf,fd->abe')
+        self.optimize_compare('ba,ac,da->bcd')
+
+    def test_inner_product(self):
+        # Inner products
+        self.optimize_compare('ab,ab')
+        self.optimize_compare('ab,ba')
+        self.optimize_compare('abc,abc')
+        self.optimize_compare('abc,bac')
+        self.optimize_compare('abc,cba')
+
+    def test_random_cases(self):
+        # Randomly built test cases
+        self.optimize_compare('aab,fa,df,ecc->bde')
+        self.optimize_compare('ecb,fef,bad,ed->ac')
+        self.optimize_compare('bcf,bbb,fbf,fc->')
+        self.optimize_compare('bb,ff,be->e')
+        self.optimize_compare('bcb,bb,fc,fff->')
+        self.optimize_compare('fbb,dfd,fc,fc->')
+        self.optimize_compare('afd,ba,cc,dc->bf')
+        self.optimize_compare('adb,bc,fa,cfc->d')
+        self.optimize_compare('bbd,bda,fc,db->acf')
+        self.optimize_compare('dba,ead,cad->bce')
+        self.optimize_compare('aef,fbc,dca->bde')
+
+    def test_combined_views_mapping(self):
+        # gh-10792
+        a = np.arange(9).reshape(1, 1, 3, 1, 3)
+        b = np.einsum('bbcdc->d', a)
+        assert_equal(b, [12])
+
+    def test_broadcasting_dot_cases(self):
+        # Ensures broadcasting cases are not mistaken for GEMM
+
+        a = np.random.rand(1, 5, 4)
+        b = np.random.rand(4, 6)
+        c = np.random.rand(5, 6)
+        d = np.random.rand(10)
+
+        self.optimize_compare('ijk,kl,jl', operands=[a, b, c])
+        self.optimize_compare('ijk,kl,jl,i->i', operands=[a, b, c, d])
+
+        e = np.random.rand(1, 1, 5, 4)
+        f = np.random.rand(7, 7)
+        self.optimize_compare('abjk,kl,jl', operands=[e, b, c])
+        self.optimize_compare('abjk,kl,jl,ab->ab', operands=[e, b, c, f])
+
+        # Edge case found in gh-11308
+        g = np.arange(64).reshape(2, 4, 8)
+        self.optimize_compare('obk,ijk->ioj', operands=[g, g])
+
+    def test_output_order(self):
+        # Ensure output order is respected for optimize cases, the below
+        # contraction should yield a reshaped tensor view
+        # gh-16415
+
+        a = np.ones((2, 3, 5), order='F')
+        b = np.ones((4, 3), order='F')
+
+        for opt in [True, False]:
+            tmp = np.einsum('...ft,mf->...mt', a, b, order='a', optimize=opt)
+            assert_(tmp.flags.f_contiguous)
+
+            tmp = np.einsum('...ft,mf->...mt', a, b, order='f', optimize=opt)
+            assert_(tmp.flags.f_contiguous)
+
+            tmp = np.einsum('...ft,mf->...mt', a, b, order='c', optimize=opt)
+            assert_(tmp.flags.c_contiguous)
+
+            tmp = np.einsum('...ft,mf->...mt', a, b, order='k', optimize=opt)
+            assert_(tmp.flags.c_contiguous is False)
+            assert_(tmp.flags.f_contiguous is False)
+
+            tmp = np.einsum('...ft,mf->...mt', a, b, optimize=opt)
+            assert_(tmp.flags.c_contiguous is False)
+            assert_(tmp.flags.f_contiguous is False)
+
+        c = np.ones((4, 3), order='C')
+        for opt in [True, False]:
+            tmp = np.einsum('...ft,mf->...mt', a, c, order='a', optimize=opt)
+            assert_(tmp.flags.c_contiguous)
+
+        d = np.ones((2, 3, 5), order='C')
+        for opt in [True, False]:
+            tmp = np.einsum('...ft,mf->...mt', d, c, order='a', optimize=opt)
+            assert_(tmp.flags.c_contiguous)
+
+class TestEinsumPath:
+    def build_operands(self, string, size_dict=global_size_dict):
+
+        # Builds views based off initial operands
+        operands = [string]
+        terms = string.split('->')[0].split(',')
+        for term in terms:
+            dims = [size_dict[x] for x in term]
+            operands.append(np.random.rand(*dims))
+
+        return operands
+
+    def assert_path_equal(self, comp, benchmark):
+        # Checks if list of tuples are equivalent
+        ret = (len(comp) == len(benchmark))
+        assert_(ret)
+        for pos in range(len(comp) - 1):
+            ret &= isinstance(comp[pos + 1], tuple)
+            ret &= (comp[pos + 1] == benchmark[pos + 1])
+        assert_(ret)
+
+    def test_memory_contraints(self):
+        # Ensure memory constraints are satisfied
+
+        outer_test = self.build_operands('a,b,c->abc')
+
+        path, path_str = np.einsum_path(*outer_test, optimize=('greedy', 0))
+        self.assert_path_equal(path, ['einsum_path', (0, 1, 2)])
+
+        path, path_str = np.einsum_path(*outer_test, optimize=('optimal', 0))
+        self.assert_path_equal(path, ['einsum_path', (0, 1, 2)])
+
+        long_test = self.build_operands('acdf,jbje,gihb,hfac')
+        path, path_str = np.einsum_path(*long_test, optimize=('greedy', 0))
+        self.assert_path_equal(path, ['einsum_path', (0, 1, 2, 3)])
+
+        path, path_str = np.einsum_path(*long_test, optimize=('optimal', 0))
+        self.assert_path_equal(path, ['einsum_path', (0, 1, 2, 3)])
+
+    def test_long_paths(self):
+        # Long complex cases
+
+        # Long test 1
+        long_test1 = self.build_operands('acdf,jbje,gihb,hfac,gfac,gifabc,hfac')
+        path, path_str = np.einsum_path(*long_test1, optimize='greedy')
+        self.assert_path_equal(path, ['einsum_path',
+                                      (3, 6), (3, 4), (2, 4), (2, 3), (0, 2), (0, 1)])
+
+        path, path_str = np.einsum_path(*long_test1, optimize='optimal')
+        self.assert_path_equal(path, ['einsum_path',
+                                      (3, 6), (3, 4), (2, 4), (2, 3), (0, 2), (0, 1)])
+
+        # Long test 2
+        long_test2 = self.build_operands('chd,bde,agbc,hiad,bdi,cgh,agdb')
+        path, path_str = np.einsum_path(*long_test2, optimize='greedy')
+        self.assert_path_equal(path, ['einsum_path',
+                                      (3, 4), (0, 3), (3, 4), (1, 3), (1, 2), (0, 1)])
+
+        path, path_str = np.einsum_path(*long_test2, optimize='optimal')
+        self.assert_path_equal(path, ['einsum_path',
+                                      (0, 5), (1, 4), (3, 4), (1, 3), (1, 2), (0, 1)])
+
+    def test_edge_paths(self):
+        # Difficult edge cases
+
+        # Edge test1
+        edge_test1 = self.build_operands('eb,cb,fb->cef')
+        path, path_str = np.einsum_path(*edge_test1, optimize='greedy')
+        self.assert_path_equal(path, ['einsum_path', (0, 2), (0, 1)])
+
+        path, path_str = np.einsum_path(*edge_test1, optimize='optimal')
+        self.assert_path_equal(path, ['einsum_path', (0, 2), (0, 1)])
+
+        # Edge test2
+        edge_test2 = self.build_operands('dd,fb,be,cdb->cef')
+        path, path_str = np.einsum_path(*edge_test2, optimize='greedy')
+        self.assert_path_equal(path, ['einsum_path', (0, 3), (0, 1), (0, 1)])
+
+        path, path_str = np.einsum_path(*edge_test2, optimize='optimal')
+        self.assert_path_equal(path, ['einsum_path', (0, 3), (0, 1), (0, 1)])
+
+        # Edge test3
+        edge_test3 = self.build_operands('bca,cdb,dbf,afc->')
+        path, path_str = np.einsum_path(*edge_test3, optimize='greedy')
+        self.assert_path_equal(path, ['einsum_path', (1, 2), (0, 2), (0, 1)])
+
+        path, path_str = np.einsum_path(*edge_test3, optimize='optimal')
+        self.assert_path_equal(path, ['einsum_path', (1, 2), (0, 2), (0, 1)])
+
+        # Edge test4
+        edge_test4 = self.build_operands('dcc,fce,ea,dbf->ab')
+        path, path_str = np.einsum_path(*edge_test4, optimize='greedy')
+        self.assert_path_equal(path, ['einsum_path', (1, 2), (0, 1), (0, 1)])
+
+        path, path_str = np.einsum_path(*edge_test4, optimize='optimal')
+        self.assert_path_equal(path, ['einsum_path', (1, 2), (0, 2), (0, 1)])
+
+        # Edge test5
+        edge_test4 = self.build_operands('a,ac,ab,ad,cd,bd,bc->',
+                                         size_dict={"a": 20, "b": 20, "c": 20, "d": 20})
+        path, path_str = np.einsum_path(*edge_test4, optimize='greedy')
+        self.assert_path_equal(path, ['einsum_path', (0, 1), (0, 1, 2, 3, 4, 5)])
+
+        path, path_str = np.einsum_path(*edge_test4, optimize='optimal')
+        self.assert_path_equal(path, ['einsum_path', (0, 1), (0, 1, 2, 3, 4, 5)])
+
+    def test_path_type_input(self):
+        # Test explicit path handling
+        path_test = self.build_operands('dcc,fce,ea,dbf->ab')
+
+        path, path_str = np.einsum_path(*path_test, optimize=False)
+        self.assert_path_equal(path, ['einsum_path', (0, 1, 2, 3)])
+
+        path, path_str = np.einsum_path(*path_test, optimize=True)
+        self.assert_path_equal(path, ['einsum_path', (1, 2), (0, 1), (0, 1)])
+
+        exp_path = ['einsum_path', (0, 2), (0, 2), (0, 1)]
+        path, path_str = np.einsum_path(*path_test, optimize=exp_path)
+        self.assert_path_equal(path, exp_path)
+
+        # Double check einsum works on the input path
+        noopt = np.einsum(*path_test, optimize=False)
+        opt = np.einsum(*path_test, optimize=exp_path)
+        assert_almost_equal(noopt, opt)
+
+    def test_path_type_input_internal_trace(self):
+        #gh-20962
+        path_test = self.build_operands('cab,cdd->ab')
+        exp_path = ['einsum_path', (1,), (0, 1)]
+
+        path, path_str = np.einsum_path(*path_test, optimize=exp_path)
+        self.assert_path_equal(path, exp_path)
+
+        # Double check einsum works on the input path
+        noopt = np.einsum(*path_test, optimize=False)
+        opt = np.einsum(*path_test, optimize=exp_path)
+        assert_almost_equal(noopt, opt)
+
+    def test_path_type_input_invalid(self):
+        path_test = self.build_operands('ab,bc,cd,de->ae')
+        exp_path = ['einsum_path', (2, 3), (0, 1)]
+        assert_raises(RuntimeError, np.einsum, *path_test, optimize=exp_path)
+        assert_raises(
+            RuntimeError, np.einsum_path, *path_test, optimize=exp_path)
+
+        path_test = self.build_operands('a,a,a->a')
+        exp_path = ['einsum_path', (1,), (0, 1)]
+        assert_raises(RuntimeError, np.einsum, *path_test, optimize=exp_path)
+        assert_raises(
+            RuntimeError, np.einsum_path, *path_test, optimize=exp_path)
+
+    def test_spaces(self):
+        #gh-10794
+        arr = np.array([[1]])
+        for sp in itertools.product(['', ' '], repeat=4):
+            # no error for any spacing
+            np.einsum('{}...a{}->{}...a{}'.format(*sp), arr)
+
+def test_overlap():
+    a = np.arange(9, dtype=int).reshape(3, 3)
+    b = np.arange(9, dtype=int).reshape(3, 3)
+    d = np.dot(a, b)
+    # sanity check
+    c = np.einsum('ij,jk->ik', a, b)
+    assert_equal(c, d)
+    #gh-10080, out overlaps one of the operands
+    c = np.einsum('ij,jk->ik', a, b, out=b)
+    assert_equal(c, d)

mantis_evalkit/lib/python3.10/site-packages/numpy/_core/tests/test_getlimits.py

@@ -0,0 +1,203 @@
+""" Test functions for limits module.
+
+"""
+import types
+import warnings
+import numpy as np
+import pytest
+from numpy._core import finfo, iinfo
+from numpy import half, single, double, longdouble
+from numpy.testing import assert_equal, assert_, assert_raises
+from numpy._core.getlimits import _discovered_machar, _float_ma
+
+##################################################
+
+class TestPythonFloat:
+    def test_singleton(self):
+        ftype = finfo(float)
+        ftype2 = finfo(float)
+        assert_equal(id(ftype), id(ftype2))
+
+class TestHalf:
+    def test_singleton(self):
+        ftype = finfo(half)
+        ftype2 = finfo(half)
+        assert_equal(id(ftype), id(ftype2))
+
+class TestSingle:
+    def test_singleton(self):
+        ftype = finfo(single)
+        ftype2 = finfo(single)
+        assert_equal(id(ftype), id(ftype2))
+
+class TestDouble:
+    def test_singleton(self):
+        ftype = finfo(double)
+        ftype2 = finfo(double)
+        assert_equal(id(ftype), id(ftype2))
+
+class TestLongdouble:
+    def test_singleton(self):
+        ftype = finfo(longdouble)
+        ftype2 = finfo(longdouble)
+        assert_equal(id(ftype), id(ftype2))
+
+def assert_finfo_equal(f1, f2):
+    # assert two finfo instances have the same attributes
+    for attr in ('bits', 'eps', 'epsneg', 'iexp', 'machep',
+                 'max', 'maxexp', 'min', 'minexp', 'negep', 'nexp',
+                 'nmant', 'precision', 'resolution', 'tiny',
+                 'smallest_normal', 'smallest_subnormal'):
+        assert_equal(getattr(f1, attr), getattr(f2, attr),
+                     f'finfo instances {f1} and {f2} differ on {attr}')
+
+def assert_iinfo_equal(i1, i2):
+    # assert two iinfo instances have the same attributes
+    for attr in ('bits', 'min', 'max'):
+        assert_equal(getattr(i1, attr), getattr(i2, attr),
+                     f'iinfo instances {i1} and {i2} differ on {attr}')
+
+class TestFinfo:
+    def test_basic(self):
+        dts = list(zip(['f2', 'f4', 'f8', 'c8', 'c16'],
+                       [np.float16, np.float32, np.float64, np.complex64,
+                        np.complex128]))
+        for dt1, dt2 in dts:
+            assert_finfo_equal(finfo(dt1), finfo(dt2))
+
+        assert_raises(ValueError, finfo, 'i4')
+
+    def test_regression_gh23108(self):
+        # np.float32(1.0) and np.float64(1.0) have the same hash and are
+        # equal under the == operator
+        f1 = np.finfo(np.float32(1.0))
+        f2 = np.finfo(np.float64(1.0))
+        assert f1 != f2
+
+    def test_regression_gh23867(self):
+        class NonHashableWithDtype:
+            __hash__ = None
+            dtype = np.dtype('float32')
+
+        x = NonHashableWithDtype()
+        assert np.finfo(x) == np.finfo(x.dtype)
+
+
+class TestIinfo:
+    def test_basic(self):
+        dts = list(zip(['i1', 'i2', 'i4', 'i8',
+                   'u1', 'u2', 'u4', 'u8'],
+                  [np.int8, np.int16, np.int32, np.int64,
+                   np.uint8, np.uint16, np.uint32, np.uint64]))
+        for dt1, dt2 in dts:
+            assert_iinfo_equal(iinfo(dt1), iinfo(dt2))
+
+        assert_raises(ValueError, iinfo, 'f4')
+
+    def test_unsigned_max(self):
+        types = np._core.sctypes['uint']
+        for T in types:
+            with np.errstate(over="ignore"):
+                max_calculated = T(0) - T(1)
+            assert_equal(iinfo(T).max, max_calculated)
+
+class TestRepr:
+    def test_iinfo_repr(self):
+        expected = "iinfo(min=-32768, max=32767, dtype=int16)"
+        assert_equal(repr(np.iinfo(np.int16)), expected)
+
+    def test_finfo_repr(self):
+        expected = "finfo(resolution=1e-06, min=-3.4028235e+38," + \
+                   " max=3.4028235e+38, dtype=float32)"
+        assert_equal(repr(np.finfo(np.float32)), expected)
+
+
+def test_instances():
+    # Test the finfo and iinfo results on numeric instances agree with
+    # the results on the corresponding types
+
+    for c in [int, np.int16, np.int32, np.int64]:
+        class_iinfo = iinfo(c)
+        instance_iinfo = iinfo(c(12))
+
+        assert_iinfo_equal(class_iinfo, instance_iinfo)
+
+    for c in [float, np.float16, np.float32, np.float64]:
+        class_finfo = finfo(c)
+        instance_finfo = finfo(c(1.2))
+        assert_finfo_equal(class_finfo, instance_finfo)
+
+    with pytest.raises(ValueError):
+        iinfo(10.)
+
+    with pytest.raises(ValueError):
+        iinfo('hi')
+
+    with pytest.raises(ValueError):
+        finfo(np.int64(1))
+
+
+def assert_ma_equal(discovered, ma_like):
+    # Check MachAr-like objects same as calculated MachAr instances
+    for key, value in discovered.__dict__.items():
+        assert_equal(value, getattr(ma_like, key))
+        if hasattr(value, 'shape'):
+            assert_equal(value.shape, getattr(ma_like, key).shape)
+            assert_equal(value.dtype, getattr(ma_like, key).dtype)
+
+
+def test_known_types():
+    # Test we are correctly compiling parameters for known types
+    for ftype, ma_like in ((np.float16, _float_ma[16]),
+                           (np.float32, _float_ma[32]),
+                           (np.float64, _float_ma[64])):
+        assert_ma_equal(_discovered_machar(ftype), ma_like)
+    # Suppress warning for broken discovery of double double on PPC
+    with np.errstate(all='ignore'):
+        ld_ma = _discovered_machar(np.longdouble)
+    bytes = np.dtype(np.longdouble).itemsize
+    if (ld_ma.it, ld_ma.maxexp) == (63, 16384) and bytes in (12, 16):
+        # 80-bit extended precision
+        assert_ma_equal(ld_ma, _float_ma[80])
+    elif (ld_ma.it, ld_ma.maxexp) == (112, 16384) and bytes == 16:
+        # IEE 754 128-bit
+        assert_ma_equal(ld_ma, _float_ma[128])
+
+
+def test_subnormal_warning():
+    """Test that the subnormal is zero warning is not being raised."""
+    with np.errstate(all='ignore'):
+        ld_ma = _discovered_machar(np.longdouble)
+    bytes = np.dtype(np.longdouble).itemsize
+    with warnings.catch_warnings(record=True) as w:
+        warnings.simplefilter('always')
+        if (ld_ma.it, ld_ma.maxexp) == (63, 16384) and bytes in (12, 16):
+            # 80-bit extended precision
+            ld_ma.smallest_subnormal
+            assert len(w) == 0
+        elif (ld_ma.it, ld_ma.maxexp) == (112, 16384) and bytes == 16:
+            # IEE 754 128-bit
+            ld_ma.smallest_subnormal
+            assert len(w) == 0
+        else:
+            # Double double
+            ld_ma.smallest_subnormal
+            # This test may fail on some platforms
+            assert len(w) == 0
+
+
+def test_plausible_finfo():
+    # Assert that finfo returns reasonable results for all types
+    for ftype in np._core.sctypes['float'] + np._core.sctypes['complex']:
+        info = np.finfo(ftype)
+        assert_(info.nmant > 1)
+        assert_(info.minexp < -1)
+        assert_(info.maxexp > 1)
+
+
+class TestRuntimeSubscriptable:
+    def test_finfo_generic(self):
+        assert isinstance(np.finfo[np.float64], types.GenericAlias)
+
+    def test_iinfo_generic(self):
+        assert isinstance(np.iinfo[np.int_], types.GenericAlias)

mantis_evalkit/lib/python3.10/site-packages/numpy/_core/tests/test_indexing.py

@@ -0,0 +1,1444 @@
+import sys
+import warnings
+import functools
+import operator
+
+import pytest
+
+import numpy as np
+from numpy._core._multiarray_tests import array_indexing
+from itertools import product
+from numpy.exceptions import ComplexWarning, VisibleDeprecationWarning
+from numpy.testing import (
+    assert_, assert_equal, assert_raises, assert_raises_regex,
+    assert_array_equal, assert_warns, HAS_REFCOUNT, IS_WASM
+    )
+
+
+class TestIndexing:
+    def test_index_no_floats(self):
+        a = np.array([[[5]]])
+
+        assert_raises(IndexError, lambda: a[0.0])
+        assert_raises(IndexError, lambda: a[0, 0.0])
+        assert_raises(IndexError, lambda: a[0.0, 0])
+        assert_raises(IndexError, lambda: a[0.0,:])
+        assert_raises(IndexError, lambda: a[:, 0.0])
+        assert_raises(IndexError, lambda: a[:, 0.0,:])
+        assert_raises(IndexError, lambda: a[0.0,:,:])
+        assert_raises(IndexError, lambda: a[0, 0, 0.0])
+        assert_raises(IndexError, lambda: a[0.0, 0, 0])
+        assert_raises(IndexError, lambda: a[0, 0.0, 0])
+        assert_raises(IndexError, lambda: a[-1.4])
+        assert_raises(IndexError, lambda: a[0, -1.4])
+        assert_raises(IndexError, lambda: a[-1.4, 0])
+        assert_raises(IndexError, lambda: a[-1.4,:])
+        assert_raises(IndexError, lambda: a[:, -1.4])
+        assert_raises(IndexError, lambda: a[:, -1.4,:])
+        assert_raises(IndexError, lambda: a[-1.4,:,:])
+        assert_raises(IndexError, lambda: a[0, 0, -1.4])
+        assert_raises(IndexError, lambda: a[-1.4, 0, 0])
+        assert_raises(IndexError, lambda: a[0, -1.4, 0])
+        assert_raises(IndexError, lambda: a[0.0:, 0.0])
+        assert_raises(IndexError, lambda: a[0.0:, 0.0,:])
+
+    def test_slicing_no_floats(self):
+        a = np.array([[5]])
+
+        # start as float.
+        assert_raises(TypeError, lambda: a[0.0:])
+        assert_raises(TypeError, lambda: a[0:, 0.0:2])
+        assert_raises(TypeError, lambda: a[0.0::2, :0])
+        assert_raises(TypeError, lambda: a[0.0:1:2,:])
+        assert_raises(TypeError, lambda: a[:, 0.0:])
+        # stop as float.
+        assert_raises(TypeError, lambda: a[:0.0])
+        assert_raises(TypeError, lambda: a[:0, 1:2.0])
+        assert_raises(TypeError, lambda: a[:0.0:2, :0])
+        assert_raises(TypeError, lambda: a[:0.0,:])
+        assert_raises(TypeError, lambda: a[:, 0:4.0:2])
+        # step as float.
+        assert_raises(TypeError, lambda: a[::1.0])
+        assert_raises(TypeError, lambda: a[0:, :2:2.0])
+        assert_raises(TypeError, lambda: a[1::4.0, :0])
+        assert_raises(TypeError, lambda: a[::5.0,:])
+        assert_raises(TypeError, lambda: a[:, 0:4:2.0])
+        # mixed.
+        assert_raises(TypeError, lambda: a[1.0:2:2.0])
+        assert_raises(TypeError, lambda: a[1.0::2.0])
+        assert_raises(TypeError, lambda: a[0:, :2.0:2.0])
+        assert_raises(TypeError, lambda: a[1.0:1:4.0, :0])
+        assert_raises(TypeError, lambda: a[1.0:5.0:5.0,:])
+        assert_raises(TypeError, lambda: a[:, 0.4:4.0:2.0])
+        # should still get the DeprecationWarning if step = 0.
+        assert_raises(TypeError, lambda: a[::0.0])
+
+    def test_index_no_array_to_index(self):
+        # No non-scalar arrays.
+        a = np.array([[[1]]])
+
+        assert_raises(TypeError, lambda: a[a:a:a])
+
+    def test_none_index(self):
+        # `None` index adds newaxis
+        a = np.array([1, 2, 3])
+        assert_equal(a[None], a[np.newaxis])
+        assert_equal(a[None].ndim, a.ndim + 1)
+
+    def test_empty_tuple_index(self):
+        # Empty tuple index creates a view
+        a = np.array([1, 2, 3])
+        assert_equal(a[()], a)
+        assert_(a[()].base is a)
+        a = np.array(0)
+        assert_(isinstance(a[()], np.int_))
+
+    def test_void_scalar_empty_tuple(self):
+        s = np.zeros((), dtype='V4')
+        assert_equal(s[()].dtype, s.dtype)
+        assert_equal(s[()], s)
+        assert_equal(type(s[...]), np.ndarray)
+
+    def test_same_kind_index_casting(self):
+        # Indexes should be cast with same-kind and not safe, even if that
+        # is somewhat unsafe. So test various different code paths.
+        index = np.arange(5)
+        u_index = index.astype(np.uintp)
+        arr = np.arange(10)
+
+        assert_array_equal(arr[index], arr[u_index])
+        arr[u_index] = np.arange(5)
+        assert_array_equal(arr, np.arange(10))
+
+        arr = np.arange(10).reshape(5, 2)
+        assert_array_equal(arr[index], arr[u_index])
+
+        arr[u_index] = np.arange(5)[:,None]
+        assert_array_equal(arr, np.arange(5)[:,None].repeat(2, axis=1))
+
+        arr = np.arange(25).reshape(5, 5)
+        assert_array_equal(arr[u_index, u_index], arr[index, index])
+
+    def test_empty_fancy_index(self):
+        # Empty list index creates an empty array
+        # with the same dtype (but with weird shape)
+        a = np.array([1, 2, 3])
+        assert_equal(a[[]], [])
+        assert_equal(a[[]].dtype, a.dtype)
+
+        b = np.array([], dtype=np.intp)
+        assert_equal(a[[]], [])
+        assert_equal(a[[]].dtype, a.dtype)
+
+        b = np.array([])
+        assert_raises(IndexError, a.__getitem__, b)
+
+    def test_gh_26542(self):
+        a = np.array([0, 1, 2])
+        idx = np.array([2, 1, 0])
+        a[idx] = a
+        expected = np.array([2, 1, 0])
+        assert_equal(a, expected)
+
+    def test_gh_26542_2d(self):
+        a = np.array([[0, 1, 2]])
+        idx_row = np.zeros(3, dtype=int)
+        idx_col = np.array([2, 1, 0])
+        a[idx_row, idx_col] = a
+        expected = np.array([[2, 1, 0]])
+        assert_equal(a, expected)
+
+    def test_gh_26542_index_overlap(self):
+        arr = np.arange(100)
+        expected_vals = np.copy(arr[:-10])
+        arr[10:] = arr[:-10]
+        actual_vals = arr[10:]
+        assert_equal(actual_vals, expected_vals)
+
+    def test_ellipsis_index(self):
+        a = np.array([[1, 2, 3],
+                      [4, 5, 6],
+                      [7, 8, 9]])
+        assert_(a[...] is not a)
+        assert_equal(a[...], a)
+        # `a[...]` was `a` in numpy <1.9.
+        assert_(a[...].base is a)
+
+        # Slicing with ellipsis can skip an
+        # arbitrary number of dimensions
+        assert_equal(a[0, ...], a[0])
+        assert_equal(a[0, ...], a[0,:])
+        assert_equal(a[..., 0], a[:, 0])
+
+        # Slicing with ellipsis always results
+        # in an array, not a scalar
+        assert_equal(a[0, ..., 1], np.array(2))
+
+        # Assignment with `(Ellipsis,)` on 0-d arrays
+        b = np.array(1)
+        b[(Ellipsis,)] = 2
+        assert_equal(b, 2)
+
+    def test_single_int_index(self):
+        # Single integer index selects one row
+        a = np.array([[1, 2, 3],
+                      [4, 5, 6],
+                      [7, 8, 9]])
+
+        assert_equal(a[0], [1, 2, 3])
+        assert_equal(a[-1], [7, 8, 9])
+
+        # Index out of bounds produces IndexError
+        assert_raises(IndexError, a.__getitem__, 1 << 30)
+        # Index overflow produces IndexError
+        assert_raises(IndexError, a.__getitem__, 1 << 64)
+
+    def test_single_bool_index(self):
+        # Single boolean index
+        a = np.array([[1, 2, 3],
+                      [4, 5, 6],
+                      [7, 8, 9]])
+
+        assert_equal(a[np.array(True)], a[None])
+        assert_equal(a[np.array(False)], a[None][0:0])
+
+    def test_boolean_shape_mismatch(self):
+        arr = np.ones((5, 4, 3))
+
+        index = np.array([True])
+        assert_raises(IndexError, arr.__getitem__, index)
+
+        index = np.array([False] * 6)
+        assert_raises(IndexError, arr.__getitem__, index)
+
+        index = np.zeros((4, 4), dtype=bool)
+        assert_raises(IndexError, arr.__getitem__, index)
+
+        assert_raises(IndexError, arr.__getitem__, (slice(None), index))
+
+    def test_boolean_indexing_onedim(self):
+        # Indexing a 2-dimensional array with
+        # boolean array of length one
+        a = np.array([[ 0.,  0.,  0.]])
+        b = np.array([ True], dtype=bool)
+        assert_equal(a[b], a)
+        # boolean assignment
+        a[b] = 1.
+        assert_equal(a, [[1., 1., 1.]])
+
+    def test_boolean_assignment_value_mismatch(self):
+        # A boolean assignment should fail when the shape of the values
+        # cannot be broadcast to the subscription. (see also gh-3458)
+        a = np.arange(4)
+
+        def f(a, v):
+            a[a > -1] = v
+
+        assert_raises(ValueError, f, a, [])
+        assert_raises(ValueError, f, a, [1, 2, 3])
+        assert_raises(ValueError, f, a[:1], [1, 2, 3])
+
+    def test_boolean_assignment_needs_api(self):
+        # See also gh-7666
+        # This caused a segfault on Python 2 due to the GIL not being
+        # held when the iterator does not need it, but the transfer function
+        # does
+        arr = np.zeros(1000)
+        indx = np.zeros(1000, dtype=bool)
+        indx[:100] = True
+        arr[indx] = np.ones(100, dtype=object)
+
+        expected = np.zeros(1000)
+        expected[:100] = 1
+        assert_array_equal(arr, expected)
+
+    def test_boolean_indexing_twodim(self):
+        # Indexing a 2-dimensional array with
+        # 2-dimensional boolean array
+        a = np.array([[1, 2, 3],
+                      [4, 5, 6],
+                      [7, 8, 9]])
+        b = np.array([[ True, False,  True],
+                      [False,  True, False],
+                      [ True, False,  True]])
+        assert_equal(a[b], [1, 3, 5, 7, 9])
+        assert_equal(a[b[1]], [[4, 5, 6]])
+        assert_equal(a[b[0]], a[b[2]])
+
+        # boolean assignment
+        a[b] = 0
+        assert_equal(a, [[0, 2, 0],
+                         [4, 0, 6],
+                         [0, 8, 0]])
+
+    def test_boolean_indexing_list(self):
+        # Regression test for #13715. It's a use-after-free bug which the
+        # test won't directly catch, but it will show up in valgrind.
+        a = np.array([1, 2, 3])
+        b = [True, False, True]
+        # Two variants of the test because the first takes a fast path
+        assert_equal(a[b], [1, 3])
+        assert_equal(a[None, b], [[1, 3]])
+
+    def test_reverse_strides_and_subspace_bufferinit(self):
+        # This tests that the strides are not reversed for simple and
+        # subspace fancy indexing.
+        a = np.ones(5)
+        b = np.zeros(5, dtype=np.intp)[::-1]
+        c = np.arange(5)[::-1]
+
+        a[b] = c
+        # If the strides are not reversed, the 0 in the arange comes last.
+        assert_equal(a[0], 0)
+
+        # This also tests that the subspace buffer is initialized:
+        a = np.ones((5, 2))
+        c = np.arange(10).reshape(5, 2)[::-1]
+        a[b, :] = c
+        assert_equal(a[0], [0, 1])
+
+    def test_reversed_strides_result_allocation(self):
+        # Test a bug when calculating the output strides for a result array
+        # when the subspace size was 1 (and test other cases as well)
+        a = np.arange(10)[:, None]
+        i = np.arange(10)[::-1]
+        assert_array_equal(a[i], a[i.copy('C')])
+
+        a = np.arange(20).reshape(-1, 2)
+
+    def test_uncontiguous_subspace_assignment(self):
+        # During development there was a bug activating a skip logic
+        # based on ndim instead of size.
+        a = np.full((3, 4, 2), -1)
+        b = np.full((3, 4, 2), -1)
+
+        a[[0, 1]] = np.arange(2 * 4 * 2).reshape(2, 4, 2).T
+        b[[0, 1]] = np.arange(2 * 4 * 2).reshape(2, 4, 2).T.copy()
+
+        assert_equal(a, b)
+
+    def test_too_many_fancy_indices_special_case(self):
+        # Just documents behaviour, this is a small limitation.
+        a = np.ones((1,) * 64)  # 64 is NPY_MAXDIMS
+        assert_raises(IndexError, a.__getitem__, (np.array([0]),) * 64)
+
+    def test_scalar_array_bool(self):
+        # NumPy bools can be used as boolean index (python ones as of yet not)
+        a = np.array(1)
+        assert_equal(a[np.bool(True)], a[np.array(True)])
+        assert_equal(a[np.bool(False)], a[np.array(False)])
+
+        # After deprecating bools as integers:
+        #a = np.array([0,1,2])
+        #assert_equal(a[True, :], a[None, :])
+        #assert_equal(a[:, True], a[:, None])
+        #
+        #assert_(not np.may_share_memory(a, a[True, :]))
+
+    def test_everything_returns_views(self):
+        # Before `...` would return a itself.
+        a = np.arange(5)
+
+        assert_(a is not a[()])
+        assert_(a is not a[...])
+        assert_(a is not a[:])
+
+    def test_broaderrors_indexing(self):
+        a = np.zeros((5, 5))
+        assert_raises(IndexError, a.__getitem__, ([0, 1], [0, 1, 2]))
+        assert_raises(IndexError, a.__setitem__, ([0, 1], [0, 1, 2]), 0)
+
+    def test_trivial_fancy_out_of_bounds(self):
+        a = np.zeros(5)
+        ind = np.ones(20, dtype=np.intp)
+        ind[-1] = 10
+        assert_raises(IndexError, a.__getitem__, ind)
+        assert_raises(IndexError, a.__setitem__, ind, 0)
+        ind = np.ones(20, dtype=np.intp)
+        ind[0] = 11
+        assert_raises(IndexError, a.__getitem__, ind)
+        assert_raises(IndexError, a.__setitem__, ind, 0)
+
+    def test_trivial_fancy_not_possible(self):
+        # Test that the fast path for trivial assignment is not incorrectly
+        # used when the index is not contiguous or 1D, see also gh-11467.
+        a = np.arange(6)
+        idx = np.arange(6, dtype=np.intp).reshape(2, 1, 3)[:, :, 0]
+        assert_array_equal(a[idx], idx)
+
+        # this case must not go into the fast path, note that idx is
+        # a non-contiguous none 1D array here.
+        a[idx] = -1
+        res = np.arange(6)
+        res[0] = -1
+        res[3] = -1
+        assert_array_equal(a, res)
+
+    def test_nonbaseclass_values(self):
+        class SubClass(np.ndarray):
+            def __array_finalize__(self, old):
+                # Have array finalize do funny things
+                self.fill(99)
+
+        a = np.zeros((5, 5))
+        s = a.copy().view(type=SubClass)
+        s.fill(1)
+
+        a[[0, 1, 2, 3, 4], :] = s
+        assert_((a == 1).all())
+
+        # Subspace is last, so transposing might want to finalize
+        a[:, [0, 1, 2, 3, 4]] = s
+        assert_((a == 1).all())
+
+        a.fill(0)
+        a[...] = s
+        assert_((a == 1).all())
+
+    def test_array_like_values(self):
+        # Similar to the above test, but use a memoryview instead
+        a = np.zeros((5, 5))
+        s = np.arange(25, dtype=np.float64).reshape(5, 5)
+
+        a[[0, 1, 2, 3, 4], :] = memoryview(s)
+        assert_array_equal(a, s)
+
+        a[:, [0, 1, 2, 3, 4]] = memoryview(s)
+        assert_array_equal(a, s)
+
+        a[...] = memoryview(s)
+        assert_array_equal(a, s)
+
+    @pytest.mark.parametrize("writeable", [True, False])
+    def test_subclass_writeable(self, writeable):
+        d = np.rec.array([('NGC1001', 11), ('NGC1002', 1.), ('NGC1003', 1.)],
+                         dtype=[('target', 'S20'), ('V_mag', '>f4')])
+        d.flags.writeable = writeable
+        # Advanced indexing results are always writeable:
+        ind = np.array([False,  True,  True], dtype=bool)
+        assert d[ind].flags.writeable
+        ind = np.array([0, 1])
+        assert d[ind].flags.writeable
+        # Views should be writeable if the original array is:
+        assert d[...].flags.writeable == writeable
+        assert d[0].flags.writeable == writeable
+
+    def test_memory_order(self):
+        # This is not necessary to preserve. Memory layouts for
+        # more complex indices are not as simple.
+        a = np.arange(10)
+        b = np.arange(10).reshape(5,2).T
+        assert_(a[b].flags.f_contiguous)
+
+        # Takes a different implementation branch:
+        a = a.reshape(-1, 1)
+        assert_(a[b, 0].flags.f_contiguous)
+
+    def test_scalar_return_type(self):
+        # Full scalar indices should return scalars and object
+        # arrays should not call PyArray_Return on their items
+        class Zero:
+            # The most basic valid indexing
+            def __index__(self):
+                return 0
+
+        z = Zero()
+
+        class ArrayLike:
+            # Simple array, should behave like the array
+            def __array__(self, dtype=None, copy=None):
+                return np.array(0)
+
+        a = np.zeros(())
+        assert_(isinstance(a[()], np.float64))
+        a = np.zeros(1)
+        assert_(isinstance(a[z], np.float64))
+        a = np.zeros((1, 1))
+        assert_(isinstance(a[z, np.array(0)], np.float64))
+        assert_(isinstance(a[z, ArrayLike()], np.float64))
+
+        # And object arrays do not call it too often:
+        b = np.array(0)
+        a = np.array(0, dtype=object)
+        a[()] = b
+        assert_(isinstance(a[()], np.ndarray))
+        a = np.array([b, None])
+        assert_(isinstance(a[z], np.ndarray))
+        a = np.array([[b, None]])
+        assert_(isinstance(a[z, np.array(0)], np.ndarray))
+        assert_(isinstance(a[z, ArrayLike()], np.ndarray))
+
+    def test_small_regressions(self):
+        # Reference count of intp for index checks
+        a = np.array([0])
+        if HAS_REFCOUNT:
+            refcount = sys.getrefcount(np.dtype(np.intp))
+        # item setting always checks indices in separate function:
+        a[np.array([0], dtype=np.intp)] = 1
+        a[np.array([0], dtype=np.uint8)] = 1
+        assert_raises(IndexError, a.__setitem__,
+                      np.array([1], dtype=np.intp), 1)
+        assert_raises(IndexError, a.__setitem__,
+                      np.array([1], dtype=np.uint8), 1)
+
+        if HAS_REFCOUNT:
+            assert_equal(sys.getrefcount(np.dtype(np.intp)), refcount)
+
+    def test_unaligned(self):
+        v = (np.zeros(64, dtype=np.int8) + ord('a'))[1:-7]
+        d = v.view(np.dtype("S8"))
+        # unaligned source
+        x = (np.zeros(16, dtype=np.int8) + ord('a'))[1:-7]
+        x = x.view(np.dtype("S8"))
+        x[...] = np.array("b" * 8, dtype="S")
+        b = np.arange(d.size)
+        #trivial
+        assert_equal(d[b], d)
+        d[b] = x
+        # nontrivial
+        # unaligned index array
+        b = np.zeros(d.size + 1).view(np.int8)[1:-(np.intp(0).itemsize - 1)]
+        b = b.view(np.intp)[:d.size]
+        b[...] = np.arange(d.size)
+        assert_equal(d[b.astype(np.int16)], d)
+        d[b.astype(np.int16)] = x
+        # boolean
+        d[b % 2 == 0]
+        d[b % 2 == 0] = x[::2]
+
+    def test_tuple_subclass(self):
+        arr = np.ones((5, 5))
+
+        # A tuple subclass should also be an nd-index
+        class TupleSubclass(tuple):
+            pass
+        index = ([1], [1])
+        index = TupleSubclass(index)
+        assert_(arr[index].shape == (1,))
+        # Unlike the non nd-index:
+        assert_(arr[index,].shape != (1,))
+
+    def test_broken_sequence_not_nd_index(self):
+        # See gh-5063:
+        # If we have an object which claims to be a sequence, but fails
+        # on item getting, this should not be converted to an nd-index (tuple)
+        # If this object happens to be a valid index otherwise, it should work
+        # This object here is very dubious and probably bad though:
+        class SequenceLike:
+            def __index__(self):
+                return 0
+
+            def __len__(self):
+                return 1
+
+            def __getitem__(self, item):
+                raise IndexError('Not possible')
+
+        arr = np.arange(10)
+        assert_array_equal(arr[SequenceLike()], arr[SequenceLike(),])
+
+        # also test that field indexing does not segfault
+        # for a similar reason, by indexing a structured array
+        arr = np.zeros((1,), dtype=[('f1', 'i8'), ('f2', 'i8')])
+        assert_array_equal(arr[SequenceLike()], arr[SequenceLike(),])
+
+    def test_indexing_array_weird_strides(self):
+        # See also gh-6221
+        # the shapes used here come from the issue and create the correct
+        # size for the iterator buffering size.
+        x = np.ones(10)
+        x2 = np.ones((10, 2))
+        ind = np.arange(10)[:, None, None, None]
+        ind = np.broadcast_to(ind, (10, 55, 4, 4))
+
+        # single advanced index case
+        assert_array_equal(x[ind], x[ind.copy()])
+        # higher dimensional advanced index
+        zind = np.zeros(4, dtype=np.intp)
+        assert_array_equal(x2[ind, zind], x2[ind.copy(), zind])
+
+    def test_indexing_array_negative_strides(self):
+        # From gh-8264,
+        # core dumps if negative strides are used in iteration
+        arro = np.zeros((4, 4))
+        arr = arro[::-1, ::-1]
+
+        slices = (slice(None), [0, 1, 2, 3])
+        arr[slices] = 10
+        assert_array_equal(arr, 10.)
+
+    def test_character_assignment(self):
+        # This is an example a function going through CopyObject which
+        # used to have an untested special path for scalars
+        # (the character special dtype case, should be deprecated probably)
+        arr = np.zeros((1, 5), dtype="c")
+        arr[0] = np.str_("asdfg")  # must assign as a sequence
+        assert_array_equal(arr[0], np.array("asdfg", dtype="c"))
+        assert arr[0, 1] == b"s"  # make sure not all were set to "a" for both
+
+    @pytest.mark.parametrize("index",
+            [True, False, np.array([0])])
+    @pytest.mark.parametrize("num", [64, 80])
+    @pytest.mark.parametrize("original_ndim", [1, 64])
+    def test_too_many_advanced_indices(self, index, num, original_ndim):
+        # These are limitations based on the number of arguments we can process.
+        # For `num=32` (and all boolean cases), the result is actually define;
+        # but the use of NpyIter (NPY_MAXARGS) limits it for technical reasons.
+        arr = np.ones((1,) * original_ndim)
+        with pytest.raises(IndexError):
+            arr[(index,) * num]
+        with pytest.raises(IndexError):
+            arr[(index,) * num] = 1.
+
+    @pytest.mark.skipif(IS_WASM, reason="no threading")
+    def test_structured_advanced_indexing(self):
+        # Test that copyswap(n) used by integer array indexing is threadsafe
+        # for structured datatypes, see gh-15387. This test can behave randomly.
+        from concurrent.futures import ThreadPoolExecutor
+
+        # Create a deeply nested dtype to make a failure more likely:
+        dt = np.dtype([("", "f8")])
+        dt = np.dtype([("", dt)] * 2)
+        dt = np.dtype([("", dt)] * 2)
+        # The array should be large enough to likely run into threading issues
+        arr = np.random.uniform(size=(6000, 8)).view(dt)[:, 0]
+
+        rng = np.random.default_rng()
+        def func(arr):
+            indx = rng.integers(0, len(arr), size=6000, dtype=np.intp)
+            arr[indx]
+
+        tpe = ThreadPoolExecutor(max_workers=8)
+        futures = [tpe.submit(func, arr) for _ in range(10)]
+        for f in futures:
+            f.result()
+
+        assert arr.dtype is dt
+
+    def test_nontuple_ndindex(self):
+        a = np.arange(25).reshape((5, 5))
+        assert_equal(a[[0, 1]], np.array([a[0], a[1]]))
+        assert_equal(a[[0, 1], [0, 1]], np.array([0, 6]))
+        assert_raises(IndexError, a.__getitem__, [slice(None)])
+
+
+class TestFieldIndexing:
+    def test_scalar_return_type(self):
+        # Field access on an array should return an array, even if it
+        # is 0-d.
+        a = np.zeros((), [('a','f8')])
+        assert_(isinstance(a['a'], np.ndarray))
+        assert_(isinstance(a[['a']], np.ndarray))
+
+
+class TestBroadcastedAssignments:
+    def assign(self, a, ind, val):
+        a[ind] = val
+        return a
+
+    def test_prepending_ones(self):
+        a = np.zeros((3, 2))
+
+        a[...] = np.ones((1, 3, 2))
+        # Fancy with subspace with and without transpose
+        a[[0, 1, 2], :] = np.ones((1, 3, 2))
+        a[:, [0, 1]] = np.ones((1, 3, 2))
+        # Fancy without subspace (with broadcasting)
+        a[[[0], [1], [2]], [0, 1]] = np.ones((1, 3, 2))
+
+    def test_prepend_not_one(self):
+        assign = self.assign
+        s_ = np.s_
+        a = np.zeros(5)
+
+        # Too large and not only ones.
+        assert_raises(ValueError, assign, a, s_[...],  np.ones((2, 1)))
+        assert_raises(ValueError, assign, a, s_[[1, 2, 3],], np.ones((2, 1)))
+        assert_raises(ValueError, assign, a, s_[[[1], [2]],], np.ones((2,2,1)))
+
+    def test_simple_broadcasting_errors(self):
+        assign = self.assign
+        s_ = np.s_
+        a = np.zeros((5, 1))
+
+        assert_raises(ValueError, assign, a, s_[...], np.zeros((5, 2)))
+        assert_raises(ValueError, assign, a, s_[...], np.zeros((5, 0)))
+        assert_raises(ValueError, assign, a, s_[:, [0]], np.zeros((5, 2)))
+        assert_raises(ValueError, assign, a, s_[:, [0]], np.zeros((5, 0)))
+        assert_raises(ValueError, assign, a, s_[[0], :], np.zeros((2, 1)))
+
+    @pytest.mark.parametrize("index", [
+            (..., [1, 2], slice(None)),
+            ([0, 1], ..., 0),
+            (..., [1, 2], [1, 2])])
+    def test_broadcast_error_reports_correct_shape(self, index):
+        values = np.zeros((100, 100))  # will never broadcast below
+
+        arr = np.zeros((3, 4, 5, 6, 7))
+        # We currently report without any spaces (could be changed)
+        shape_str = str(arr[index].shape).replace(" ", "")
+
+        with pytest.raises(ValueError) as e:
+            arr[index] = values
+
+        assert str(e.value).endswith(shape_str)
+
+    def test_index_is_larger(self):
+        # Simple case of fancy index broadcasting of the index.
+        a = np.zeros((5, 5))
+        a[[[0], [1], [2]], [0, 1, 2]] = [2, 3, 4]
+
+        assert_((a[:3, :3] == [2, 3, 4]).all())
+
+    def test_broadcast_subspace(self):
+        a = np.zeros((100, 100))
+        v = np.arange(100)[:,None]
+        b = np.arange(100)[::-1]
+        a[b] = v
+        assert_((a[::-1] == v).all())
+
+
+class TestSubclasses:
+    def test_basic(self):
+        # Test that indexing in various ways produces SubClass instances,
+        # and that the base is set up correctly: the original subclass
+        # instance for views, and a new ndarray for advanced/boolean indexing
+        # where a copy was made (latter a regression test for gh-11983).
+        class SubClass(np.ndarray):
+            pass
+
+        a = np.arange(5)
+        s = a.view(SubClass)
+        s_slice = s[:3]
+        assert_(type(s_slice) is SubClass)
+        assert_(s_slice.base is s)
+        assert_array_equal(s_slice, a[:3])
+
+        s_fancy = s[[0, 1, 2]]
+        assert_(type(s_fancy) is SubClass)
+        assert_(s_fancy.base is not s)
+        assert_(type(s_fancy.base) is np.ndarray)
+        assert_array_equal(s_fancy, a[[0, 1, 2]])
+        assert_array_equal(s_fancy.base, a[[0, 1, 2]])
+
+        s_bool = s[s > 0]
+        assert_(type(s_bool) is SubClass)
+        assert_(s_bool.base is not s)
+        assert_(type(s_bool.base) is np.ndarray)
+        assert_array_equal(s_bool, a[a > 0])
+        assert_array_equal(s_bool.base, a[a > 0])
+
+    def test_fancy_on_read_only(self):
+        # Test that fancy indexing on read-only SubClass does not make a
+        # read-only copy (gh-14132)
+        class SubClass(np.ndarray):
+            pass
+
+        a = np.arange(5)
+        s = a.view(SubClass)
+        s.flags.writeable = False
+        s_fancy = s[[0, 1, 2]]
+        assert_(s_fancy.flags.writeable)
+
+
+    def test_finalize_gets_full_info(self):
+        # Array finalize should be called on the filled array.
+        class SubClass(np.ndarray):
+            def __array_finalize__(self, old):
+                self.finalize_status = np.array(self)
+                self.old = old
+
+        s = np.arange(10).view(SubClass)
+        new_s = s[:3]
+        assert_array_equal(new_s.finalize_status, new_s)
+        assert_array_equal(new_s.old, s)
+
+        new_s = s[[0,1,2,3]]
+        assert_array_equal(new_s.finalize_status, new_s)
+        assert_array_equal(new_s.old, s)
+
+        new_s = s[s > 0]
+        assert_array_equal(new_s.finalize_status, new_s)
+        assert_array_equal(new_s.old, s)
+
+
+class TestFancyIndexingCast:
+    def test_boolean_index_cast_assign(self):
+        # Setup the boolean index and float arrays.
+        shape = (8, 63)
+        bool_index = np.zeros(shape).astype(bool)
+        bool_index[0, 1] = True
+        zero_array = np.zeros(shape)
+
+        # Assigning float is fine.
+        zero_array[bool_index] = np.array([1])
+        assert_equal(zero_array[0, 1], 1)
+
+        # Fancy indexing works, although we get a cast warning.
+        assert_warns(ComplexWarning,
+                     zero_array.__setitem__, ([0], [1]), np.array([2 + 1j]))
+        assert_equal(zero_array[0, 1], 2)  # No complex part
+
+        # Cast complex to float, throwing away the imaginary portion.
+        assert_warns(ComplexWarning,
+                     zero_array.__setitem__, bool_index, np.array([1j]))
+        assert_equal(zero_array[0, 1], 0)
+
+class TestFancyIndexingEquivalence:
+    def test_object_assign(self):
+        # Check that the field and object special case using copyto is active.
+        # The right hand side cannot be converted to an array here.
+        a = np.arange(5, dtype=object)
+        b = a.copy()
+        a[:3] = [1, (1,2), 3]
+        b[[0, 1, 2]] = [1, (1,2), 3]
+        assert_array_equal(a, b)
+
+        # test same for subspace fancy indexing
+        b = np.arange(5, dtype=object)[None, :]
+        b[[0], :3] = [[1, (1,2), 3]]
+        assert_array_equal(a, b[0])
+
+        # Check that swapping of axes works.
+        # There was a bug that made the later assignment throw a ValueError
+        # do to an incorrectly transposed temporary right hand side (gh-5714)
+        b = b.T
+        b[:3, [0]] = [[1], [(1,2)], [3]]
+        assert_array_equal(a, b[:, 0])
+
+        # Another test for the memory order of the subspace
+        arr = np.ones((3, 4, 5), dtype=object)
+        # Equivalent slicing assignment for comparison
+        cmp_arr = arr.copy()
+        cmp_arr[:1, ...] = [[[1], [2], [3], [4]]]
+        arr[[0], ...] = [[[1], [2], [3], [4]]]
+        assert_array_equal(arr, cmp_arr)
+        arr = arr.copy('F')
+        arr[[0], ...] = [[[1], [2], [3], [4]]]
+        assert_array_equal(arr, cmp_arr)
+
+    def test_cast_equivalence(self):
+        # Yes, normal slicing uses unsafe casting.
+        a = np.arange(5)
+        b = a.copy()
+
+        a[:3] = np.array(['2', '-3', '-1'])
+        b[[0, 2, 1]] = np.array(['2', '-1', '-3'])
+        assert_array_equal(a, b)
+
+        # test the same for subspace fancy indexing
+        b = np.arange(5)[None, :]
+        b[[0], :3] = np.array([['2', '-3', '-1']])
+        assert_array_equal(a, b[0])
+
+
+class TestMultiIndexingAutomated:
+    """
+    These tests use code to mimic the C-Code indexing for selection.
+
+    NOTE:
+
+        * This still lacks tests for complex item setting.
+        * If you change behavior of indexing, you might want to modify
+          these tests to try more combinations.
+        * Behavior was written to match numpy version 1.8. (though a
+          first version matched 1.7.)
+        * Only tuple indices are supported by the mimicking code.
+          (and tested as of writing this)
+        * Error types should match most of the time as long as there
+          is only one error. For multiple errors, what gets raised
+          will usually not be the same one. They are *not* tested.
+
+    Update 2016-11-30: It is probably not worth maintaining this test
+    indefinitely and it can be dropped if maintenance becomes a burden.
+
+    """
+
+    def setup_method(self):
+        self.a = np.arange(np.prod([3, 1, 5, 6])).reshape(3, 1, 5, 6)
+        self.b = np.empty((3, 0, 5, 6))
+        self.complex_indices = ['skip', Ellipsis,
+            0,
+            # Boolean indices, up to 3-d for some special cases of eating up
+            # dimensions, also need to test all False
+            np.array([True, False, False]),
+            np.array([[True, False], [False, True]]),
+            np.array([[[False, False], [False, False]]]),
+            # Some slices:
+            slice(-5, 5, 2),
+            slice(1, 1, 100),
+            slice(4, -1, -2),
+            slice(None, None, -3),
+            # Some Fancy indexes:
+            np.empty((0, 1, 1), dtype=np.intp),  # empty and can be broadcast
+            np.array([0, 1, -2]),
+            np.array([[2], [0], [1]]),
+            np.array([[0, -1], [0, 1]], dtype=np.dtype('intp').newbyteorder()),
+            np.array([2, -1], dtype=np.int8),
+            np.zeros([1]*31, dtype=int),  # trigger too large array.
+            np.array([0., 1.])]  # invalid datatype
+        # Some simpler indices that still cover a bit more
+        self.simple_indices = [Ellipsis, None, -1, [1], np.array([True]),
+                               'skip']
+        # Very simple ones to fill the rest:
+        self.fill_indices = [slice(None, None), 0]
+
+    def _get_multi_index(self, arr, indices):
+        """Mimic multi dimensional indexing.
+
+        Parameters
+        ----------
+        arr : ndarray
+            Array to be indexed.
+        indices : tuple of index objects
+
+        Returns
+        -------
+        out : ndarray
+            An array equivalent to the indexing operation (but always a copy).
+            `arr[indices]` should be identical.
+        no_copy : bool
+            Whether the indexing operation requires a copy. If this is `True`,
+            `np.may_share_memory(arr, arr[indices])` should be `True` (with
+            some exceptions for scalars and possibly 0-d arrays).
+
+        Notes
+        -----
+        While the function may mostly match the errors of normal indexing this
+        is generally not the case.
+        """
+        in_indices = list(indices)
+        indices = []
+        # if False, this is a fancy or boolean index
+        no_copy = True
+        # number of fancy/scalar indexes that are not consecutive
+        num_fancy = 0
+        # number of dimensions indexed by a "fancy" index
+        fancy_dim = 0
+        # NOTE: This is a funny twist (and probably OK to change).
+        # The boolean array has illegal indexes, but this is
+        # allowed if the broadcast fancy-indices are 0-sized.
+        # This variable is to catch that case.
+        error_unless_broadcast_to_empty = False
+
+        # We need to handle Ellipsis and make arrays from indices, also
+        # check if this is fancy indexing (set no_copy).
+        ndim = 0
+        ellipsis_pos = None  # define here mostly to replace all but first.
+        for i, indx in enumerate(in_indices):
+            if indx is None:
+                continue
+            if isinstance(indx, np.ndarray) and indx.dtype == bool:
+                no_copy = False
+                if indx.ndim == 0:
+                    raise IndexError
+                # boolean indices can have higher dimensions
+                ndim += indx.ndim
+                fancy_dim += indx.ndim
+                continue
+            if indx is Ellipsis:
+                if ellipsis_pos is None:
+                    ellipsis_pos = i
+                    continue  # do not increment ndim counter
+                raise IndexError
+            if isinstance(indx, slice):
+                ndim += 1
+                continue
+            if not isinstance(indx, np.ndarray):
+                # This could be open for changes in numpy.
+                # numpy should maybe raise an error if casting to intp
+                # is not safe. It rejects np.array([1., 2.]) but not
+                # [1., 2.] as index (same for ie. np.take).
+                # (Note the importance of empty lists if changing this here)
+                try:
+                    indx = np.array(indx, dtype=np.intp)
+                except ValueError:
+                    raise IndexError
+                in_indices[i] = indx
+            elif indx.dtype.kind != 'b' and indx.dtype.kind != 'i':
+                raise IndexError('arrays used as indices must be of '
+                                 'integer (or boolean) type')
+            if indx.ndim != 0:
+                no_copy = False
+            ndim += 1
+            fancy_dim += 1
+
+        if arr.ndim - ndim < 0:
+            # we can't take more dimensions then we have, not even for 0-d
+            # arrays.  since a[()] makes sense, but not a[(),]. We will
+            # raise an error later on, unless a broadcasting error occurs
+            # first.
+            raise IndexError
+
+        if ndim == 0 and None not in in_indices:
+            # Well we have no indexes or one Ellipsis. This is legal.
+            return arr.copy(), no_copy
+
+        if ellipsis_pos is not None:
+            in_indices[ellipsis_pos:ellipsis_pos+1] = ([slice(None, None)] *
+                                                       (arr.ndim - ndim))
+
+        for ax, indx in enumerate(in_indices):
+            if isinstance(indx, slice):
+                # convert to an index array
+                indx = np.arange(*indx.indices(arr.shape[ax]))
+                indices.append(['s', indx])
+                continue
+            elif indx is None:
+                # this is like taking a slice with one element from a new axis:
+                indices.append(['n', np.array([0], dtype=np.intp)])
+                arr = arr.reshape(arr.shape[:ax] + (1,) + arr.shape[ax:])
+                continue
+            if isinstance(indx, np.ndarray) and indx.dtype == bool:
+                if indx.shape != arr.shape[ax:ax+indx.ndim]:
+                    raise IndexError
+
+                try:
+                    flat_indx = np.ravel_multi_index(np.nonzero(indx),
+                                    arr.shape[ax:ax+indx.ndim], mode='raise')
+                except Exception:
+                    error_unless_broadcast_to_empty = True
+                    # fill with 0s instead, and raise error later
+                    flat_indx = np.array([0]*indx.sum(), dtype=np.intp)
+                # concatenate axis into a single one:
+                if indx.ndim != 0:
+                    arr = arr.reshape(arr.shape[:ax]
+                                  + (np.prod(arr.shape[ax:ax+indx.ndim]),)
+                                  + arr.shape[ax+indx.ndim:])
+                    indx = flat_indx
+                else:
+                    # This could be changed, a 0-d boolean index can
+                    # make sense (even outside the 0-d indexed array case)
+                    # Note that originally this is could be interpreted as
+                    # integer in the full integer special case.
+                    raise IndexError
+            else:
+                # If the index is a singleton, the bounds check is done
+                # before the broadcasting. This used to be different in <1.9
+                if indx.ndim == 0:
+                    if indx >= arr.shape[ax] or indx < -arr.shape[ax]:
+                        raise IndexError
+            if indx.ndim == 0:
+                # The index is a scalar. This used to be two fold, but if
+                # fancy indexing was active, the check was done later,
+                # possibly after broadcasting it away (1.7. or earlier).
+                # Now it is always done.
+                if indx >= arr.shape[ax] or indx < - arr.shape[ax]:
+                    raise IndexError
+            if (len(indices) > 0 and
+                    indices[-1][0] == 'f' and
+                    ax != ellipsis_pos):
+                # NOTE: There could still have been a 0-sized Ellipsis
+                # between them. Checked that with ellipsis_pos.
+                indices[-1].append(indx)
+            else:
+                # We have a fancy index that is not after an existing one.
+                # NOTE: A 0-d array triggers this as well, while one may
+                # expect it to not trigger it, since a scalar would not be
+                # considered fancy indexing.
+                num_fancy += 1
+                indices.append(['f', indx])
+
+        if num_fancy > 1 and not no_copy:
+            # We have to flush the fancy indexes left
+            new_indices = indices[:]
+            axes = list(range(arr.ndim))
+            fancy_axes = []
+            new_indices.insert(0, ['f'])
+            ni = 0
+            ai = 0
+            for indx in indices:
+                ni += 1
+                if indx[0] == 'f':
+                    new_indices[0].extend(indx[1:])
+                    del new_indices[ni]
+                    ni -= 1
+                    for ax in range(ai, ai + len(indx[1:])):
+                        fancy_axes.append(ax)
+                        axes.remove(ax)
+                ai += len(indx) - 1  # axis we are at
+            indices = new_indices
+            # and now we need to transpose arr:
+            arr = arr.transpose(*(fancy_axes + axes))
+
+        # We only have one 'f' index now and arr is transposed accordingly.
+        # Now handle newaxis by reshaping...
+        ax = 0
+        for indx in indices:
+            if indx[0] == 'f':
+                if len(indx) == 1:
+                    continue
+                # First of all, reshape arr to combine fancy axes into one:
+                orig_shape = arr.shape
+                orig_slice = orig_shape[ax:ax + len(indx[1:])]
+                arr = arr.reshape(arr.shape[:ax]
+                                    + (np.prod(orig_slice).astype(int),)
+                                    + arr.shape[ax + len(indx[1:]):])
+
+                # Check if broadcasting works
+                res = np.broadcast(*indx[1:])
+                # unfortunately the indices might be out of bounds. So check
+                # that first, and use mode='wrap' then. However only if
+                # there are any indices...
+                if res.size != 0:
+                    if error_unless_broadcast_to_empty:
+                        raise IndexError
+                    for _indx, _size in zip(indx[1:], orig_slice):
+                        if _indx.size == 0:
+                            continue
+                        if np.any(_indx >= _size) or np.any(_indx < -_size):
+                                raise IndexError
+                if len(indx[1:]) == len(orig_slice):
+                    if np.prod(orig_slice) == 0:
+                        # Work around for a crash or IndexError with 'wrap'
+                        # in some 0-sized cases.
+                        try:
+                            mi = np.ravel_multi_index(indx[1:], orig_slice,
+                                                      mode='raise')
+                        except Exception:
+                            # This happens with 0-sized orig_slice (sometimes?)
+                            # here it is a ValueError, but indexing gives a:
+                            raise IndexError('invalid index into 0-sized')
+                    else:
+                        mi = np.ravel_multi_index(indx[1:], orig_slice,
+                                                  mode='wrap')
+                else:
+                    # Maybe never happens...
+                    raise ValueError
+                arr = arr.take(mi.ravel(), axis=ax)
+                try:
+                    arr = arr.reshape(arr.shape[:ax]
+                                        + mi.shape
+                                        + arr.shape[ax+1:])
+                except ValueError:
+                    # too many dimensions, probably
+                    raise IndexError
+                ax += mi.ndim
+                continue
+
+            # If we are here, we have a 1D array for take:
+            arr = arr.take(indx[1], axis=ax)
+            ax += 1
+
+        return arr, no_copy
+
+    def _check_multi_index(self, arr, index):
+        """Check a multi index item getting and simple setting.
+
+        Parameters
+        ----------
+        arr : ndarray
+            Array to be indexed, must be a reshaped arange.
+        index : tuple of indexing objects
+            Index being tested.
+        """
+        # Test item getting
+        try:
+            mimic_get, no_copy = self._get_multi_index(arr, index)
+        except Exception as e:
+            if HAS_REFCOUNT:
+                prev_refcount = sys.getrefcount(arr)
+            assert_raises(type(e), arr.__getitem__, index)
+            assert_raises(type(e), arr.__setitem__, index, 0)
+            if HAS_REFCOUNT:
+                assert_equal(prev_refcount, sys.getrefcount(arr))
+            return
+
+        self._compare_index_result(arr, index, mimic_get, no_copy)
+
+    def _check_single_index(self, arr, index):
+        """Check a single index item getting and simple setting.
+
+        Parameters
+        ----------
+        arr : ndarray
+            Array to be indexed, must be an arange.
+        index : indexing object
+            Index being tested. Must be a single index and not a tuple
+            of indexing objects (see also `_check_multi_index`).
+        """
+        try:
+            mimic_get, no_copy = self._get_multi_index(arr, (index,))
+        except Exception as e:
+            if HAS_REFCOUNT:
+                prev_refcount = sys.getrefcount(arr)
+            assert_raises(type(e), arr.__getitem__, index)
+            assert_raises(type(e), arr.__setitem__, index, 0)
+            if HAS_REFCOUNT:
+                assert_equal(prev_refcount, sys.getrefcount(arr))
+            return
+
+        self._compare_index_result(arr, index, mimic_get, no_copy)
+
+    def _compare_index_result(self, arr, index, mimic_get, no_copy):
+        """Compare mimicked result to indexing result.
+        """
+        arr = arr.copy()
+        indexed_arr = arr[index]
+        assert_array_equal(indexed_arr, mimic_get)
+        # Check if we got a view, unless its a 0-sized or 0-d array.
+        # (then its not a view, and that does not matter)
+        if indexed_arr.size != 0 and indexed_arr.ndim != 0:
+            assert_(np.may_share_memory(indexed_arr, arr) == no_copy)
+            # Check reference count of the original array
+            if HAS_REFCOUNT:
+                if no_copy:
+                    # refcount increases by one:
+                    assert_equal(sys.getrefcount(arr), 3)
+                else:
+                    assert_equal(sys.getrefcount(arr), 2)
+
+        # Test non-broadcast setitem:
+        b = arr.copy()
+        b[index] = mimic_get + 1000
+        if b.size == 0:
+            return  # nothing to compare here...
+        if no_copy and indexed_arr.ndim != 0:
+            # change indexed_arr in-place to manipulate original:
+            indexed_arr += 1000
+            assert_array_equal(arr, b)
+            return
+        # Use the fact that the array is originally an arange:
+        arr.flat[indexed_arr.ravel()] += 1000
+        assert_array_equal(arr, b)
+
+    def test_boolean(self):
+        a = np.array(5)
+        assert_equal(a[np.array(True)], 5)
+        a[np.array(True)] = 1
+        assert_equal(a, 1)
+        # NOTE: This is different from normal broadcasting, as
+        # arr[boolean_array] works like in a multi index. Which means
+        # it is aligned to the left. This is probably correct for
+        # consistency with arr[boolean_array,] also no broadcasting
+        # is done at all
+        self._check_multi_index(
+            self.a, (np.zeros_like(self.a, dtype=bool),))
+        self._check_multi_index(
+            self.a, (np.zeros_like(self.a, dtype=bool)[..., 0],))
+        self._check_multi_index(
+            self.a, (np.zeros_like(self.a, dtype=bool)[None, ...],))
+
+    def test_multidim(self):
+        # Automatically test combinations with complex indexes on 2nd (or 1st)
+        # spot and the simple ones in one other spot.
+        with warnings.catch_warnings():
+            # This is so that np.array(True) is not accepted in a full integer
+            # index, when running the file separately.
+            warnings.filterwarnings('error', '', DeprecationWarning)
+            warnings.filterwarnings('error', '', VisibleDeprecationWarning)
+
+            def isskip(idx):
+                return isinstance(idx, str) and idx == "skip"
+
+            for simple_pos in [0, 2, 3]:
+                tocheck = [self.fill_indices, self.complex_indices,
+                           self.fill_indices, self.fill_indices]
+                tocheck[simple_pos] = self.simple_indices
+                for index in product(*tocheck):
+                    index = tuple(i for i in index if not isskip(i))
+                    self._check_multi_index(self.a, index)
+                    self._check_multi_index(self.b, index)
+
+        # Check very simple item getting:
+        self._check_multi_index(self.a, (0, 0, 0, 0))
+        self._check_multi_index(self.b, (0, 0, 0, 0))
+        # Also check (simple cases of) too many indices:
+        assert_raises(IndexError, self.a.__getitem__, (0, 0, 0, 0, 0))
+        assert_raises(IndexError, self.a.__setitem__, (0, 0, 0, 0, 0), 0)
+        assert_raises(IndexError, self.a.__getitem__, (0, 0, [1], 0, 0))
+        assert_raises(IndexError, self.a.__setitem__, (0, 0, [1], 0, 0), 0)
+
+    def test_1d(self):
+        a = np.arange(10)
+        for index in self.complex_indices:
+            self._check_single_index(a, index)
+
+class TestFloatNonIntegerArgument:
+    """
+    These test that ``TypeError`` is raised when you try to use
+    non-integers as arguments to for indexing and slicing e.g. ``a[0.0:5]``
+    and ``a[0.5]``, or other functions like ``array.reshape(1., -1)``.
+
+    """
+    def test_valid_indexing(self):
+        # These should raise no errors.
+        a = np.array([[[5]]])
+
+        a[np.array([0])]
+        a[[0, 0]]
+        a[:, [0, 0]]
+        a[:, 0,:]
+        a[:,:,:]
+
+    def test_valid_slicing(self):
+        # These should raise no errors.
+        a = np.array([[[5]]])
+
+        a[::]
+        a[0:]
+        a[:2]
+        a[0:2]
+        a[::2]
+        a[1::2]
+        a[:2:2]
+        a[1:2:2]
+
+    def test_non_integer_argument_errors(self):
+        a = np.array([[5]])
+
+        assert_raises(TypeError, np.reshape, a, (1., 1., -1))
+        assert_raises(TypeError, np.reshape, a, (np.array(1.), -1))
+        assert_raises(TypeError, np.take, a, [0], 1.)
+        assert_raises(TypeError, np.take, a, [0], np.float64(1.))
+
+    def test_non_integer_sequence_multiplication(self):
+        # NumPy scalar sequence multiply should not work with non-integers
+        def mult(a, b):
+            return a * b
+
+        assert_raises(TypeError, mult, [1], np.float64(3))
+        # following should be OK
+        mult([1], np.int_(3))
+
+    def test_reduce_axis_float_index(self):
+        d = np.zeros((3,3,3))
+        assert_raises(TypeError, np.min, d, 0.5)
+        assert_raises(TypeError, np.min, d, (0.5, 1))
+        assert_raises(TypeError, np.min, d, (1, 2.2))
+        assert_raises(TypeError, np.min, d, (.2, 1.2))
+
+
+class TestBooleanIndexing:
+    # Using a boolean as integer argument/indexing is an error.
+    def test_bool_as_int_argument_errors(self):
+        a = np.array([[[1]]])
+
+        assert_raises(TypeError, np.reshape, a, (True, -1))
+        assert_raises(TypeError, np.reshape, a, (np.bool(True), -1))
+        # Note that operator.index(np.array(True)) does not work, a boolean
+        # array is thus also deprecated, but not with the same message:
+        assert_raises(TypeError, operator.index, np.array(True))
+        assert_warns(DeprecationWarning, operator.index, np.True_)
+        assert_raises(TypeError, np.take, args=(a, [0], False))
+
+    def test_boolean_indexing_weirdness(self):
+        # Weird boolean indexing things
+        a = np.ones((2, 3, 4))
+        assert a[False, True, ...].shape == (0, 2, 3, 4)
+        assert a[True, [0, 1], True, True, [1], [[2]]].shape == (1, 2)
+        assert_raises(IndexError, lambda: a[False, [0, 1], ...])
+
+    def test_boolean_indexing_fast_path(self):
+        # These used to either give the wrong error, or incorrectly give no
+        # error.
+        a = np.ones((3, 3))
+
+        # This used to incorrectly work (and give an array of shape (0,))
+        idx1 = np.array([[False]*9])
+        assert_raises_regex(IndexError,
+            "boolean index did not match indexed array along axis 0; "
+            "size of axis is 3 but size of corresponding boolean axis is 1",
+            lambda: a[idx1])
+
+        # This used to incorrectly give a ValueError: operands could not be broadcast together
+        idx2 = np.array([[False]*8 + [True]])
+        assert_raises_regex(IndexError,
+            "boolean index did not match indexed array along axis 0; "
+            "size of axis is 3 but size of corresponding boolean axis is 1",
+            lambda: a[idx2])
+
+        # This is the same as it used to be. The above two should work like this.
+        idx3 = np.array([[False]*10])
+        assert_raises_regex(IndexError,
+            "boolean index did not match indexed array along axis 0; "
+            "size of axis is 3 but size of corresponding boolean axis is 1",
+            lambda: a[idx3])
+
+        # This used to give ValueError: non-broadcastable operand
+        a = np.ones((1, 1, 2))
+        idx = np.array([[[True], [False]]])
+        assert_raises_regex(IndexError,
+            "boolean index did not match indexed array along axis 1; "
+            "size of axis is 1 but size of corresponding boolean axis is 2",
+            lambda: a[idx])
+
+
+class TestArrayToIndexDeprecation:
+    """Creating an index from array not 0-D is an error.
+
+    """
+    def test_array_to_index_error(self):
+        # so no exception is expected. The raising is effectively tested above.
+        a = np.array([[[1]]])
+
+        assert_raises(TypeError, operator.index, np.array([1]))
+        assert_raises(TypeError, np.reshape, a, (a, -1))
+        assert_raises(TypeError, np.take, a, [0], a)
+
+
+class TestNonIntegerArrayLike:
+    """Tests that array_likes only valid if can safely cast to integer.
+
+    For instance, lists give IndexError when they cannot be safely cast to
+    an integer.
+
+    """
+    def test_basic(self):
+        a = np.arange(10)
+
+        assert_raises(IndexError, a.__getitem__, [0.5, 1.5])
+        assert_raises(IndexError, a.__getitem__, (['1', '2'],))
+
+        # The following is valid
+        a.__getitem__([])
+
+
+class TestMultipleEllipsisError:
+    """An index can only have a single ellipsis.
+
+    """
+    def test_basic(self):
+        a = np.arange(10)
+        assert_raises(IndexError, lambda: a[..., ...])
+        assert_raises(IndexError, a.__getitem__, ((Ellipsis,) * 2,))
+        assert_raises(IndexError, a.__getitem__, ((Ellipsis,) * 3,))
+
+
+class TestCApiAccess:
+    def test_getitem(self):
+        subscript = functools.partial(array_indexing, 0)
+
+        # 0-d arrays don't work:
+        assert_raises(IndexError, subscript, np.ones(()), 0)
+        # Out of bound values:
+        assert_raises(IndexError, subscript, np.ones(10), 11)
+        assert_raises(IndexError, subscript, np.ones(10), -11)
+        assert_raises(IndexError, subscript, np.ones((10, 10)), 11)
+        assert_raises(IndexError, subscript, np.ones((10, 10)), -11)
+
+        a = np.arange(10)
+        assert_array_equal(a[4], subscript(a, 4))
+        a = a.reshape(5, 2)
+        assert_array_equal(a[-4], subscript(a, -4))
+
+    def test_setitem(self):
+        assign = functools.partial(array_indexing, 1)
+
+        # Deletion is impossible:
+        assert_raises(ValueError, assign, np.ones(10), 0)
+        # 0-d arrays don't work:
+        assert_raises(IndexError, assign, np.ones(()), 0, 0)
+        # Out of bound values:
+        assert_raises(IndexError, assign, np.ones(10), 11, 0)
+        assert_raises(IndexError, assign, np.ones(10), -11, 0)
+        assert_raises(IndexError, assign, np.ones((10, 10)), 11, 0)
+        assert_raises(IndexError, assign, np.ones((10, 10)), -11, 0)
+
+        a = np.arange(10)
+        assign(a, 4, 10)
+        assert_(a[4] == 10)
+
+        a = a.reshape(5, 2)
+        assign(a, 4, 10)
+        assert_array_equal(a[-1], [10, 10])

mantis_evalkit/lib/python3.10/site-packages/numpy/_core/tests/test_mem_overlap.py

@@ -0,0 +1,933 @@
+import itertools
+import pytest
+
+import numpy as np
+from numpy._core._multiarray_tests import solve_diophantine, internal_overlap
+from numpy._core import _umath_tests
+from numpy.lib.stride_tricks import as_strided
+from numpy.testing import (
+    assert_, assert_raises, assert_equal, assert_array_equal
+    )
+
+
+ndims = 2
+size = 10
+shape = tuple([size] * ndims)
+
+MAY_SHARE_BOUNDS = 0
+MAY_SHARE_EXACT = -1
+
+
+def _indices_for_nelems(nelems):
+    """Returns slices of length nelems, from start onwards, in direction sign."""
+
+    if nelems == 0:
+        return [size // 2]  # int index
+
+    res = []
+    for step in (1, 2):
+        for sign in (-1, 1):
+            start = size // 2 - nelems * step * sign // 2
+            stop = start + nelems * step * sign
+            res.append(slice(start, stop, step * sign))
+
+    return res
+
+
+def _indices_for_axis():
+    """Returns (src, dst) pairs of indices."""
+
+    res = []
+    for nelems in (0, 2, 3):
+        ind = _indices_for_nelems(nelems)
+        res.extend(itertools.product(ind, ind))  # all assignments of size "nelems"
+
+    return res
+
+
+def _indices(ndims):
+    """Returns ((axis0_src, axis0_dst), (axis1_src, axis1_dst), ... ) index pairs."""
+
+    ind = _indices_for_axis()
+    return itertools.product(ind, repeat=ndims)
+
+
+def _check_assignment(srcidx, dstidx):
+    """Check assignment arr[dstidx] = arr[srcidx] works."""
+
+    arr = np.arange(np.prod(shape)).reshape(shape)
+
+    cpy = arr.copy()
+
+    cpy[dstidx] = arr[srcidx]
+    arr[dstidx] = arr[srcidx]
+
+    assert_(np.all(arr == cpy),
+            'assigning arr[%s] = arr[%s]' % (dstidx, srcidx))
+
+
+def test_overlapping_assignments():
+    # Test automatically generated assignments which overlap in memory.
+
+    inds = _indices(ndims)
+
+    for ind in inds:
+        srcidx = tuple([a[0] for a in ind])
+        dstidx = tuple([a[1] for a in ind])
+
+        _check_assignment(srcidx, dstidx)
+
+
+@pytest.mark.slow
+def test_diophantine_fuzz():
+    # Fuzz test the diophantine solver
+    rng = np.random.RandomState(1234)
+
+    max_int = np.iinfo(np.intp).max
+
+    for ndim in range(10):
+        feasible_count = 0
+        infeasible_count = 0
+
+        min_count = 500//(ndim + 1)
+
+        while min(feasible_count, infeasible_count) < min_count:
+            # Ensure big and small integer problems
+            A_max = 1 + rng.randint(0, 11, dtype=np.intp)**6
+            U_max = rng.randint(0, 11, dtype=np.intp)**6
+
+            A_max = min(max_int, A_max)
+            U_max = min(max_int-1, U_max)
+
+            A = tuple(int(rng.randint(1, A_max+1, dtype=np.intp))
+                      for j in range(ndim))
+            U = tuple(int(rng.randint(0, U_max+2, dtype=np.intp))
+                      for j in range(ndim))
+
+            b_ub = min(max_int-2, sum(a*ub for a, ub in zip(A, U)))
+            b = int(rng.randint(-1, b_ub+2, dtype=np.intp))
+
+            if ndim == 0 and feasible_count < min_count:
+                b = 0
+
+            X = solve_diophantine(A, U, b)
+
+            if X is None:
+                # Check the simplified decision problem agrees
+                X_simplified = solve_diophantine(A, U, b, simplify=1)
+                assert_(X_simplified is None, (A, U, b, X_simplified))
+
+                # Check no solution exists (provided the problem is
+                # small enough so that brute force checking doesn't
+                # take too long)
+                ranges = tuple(range(0, a*ub+1, a) for a, ub in zip(A, U))
+
+                size = 1
+                for r in ranges:
+                    size *= len(r)
+                if size < 100000:
+                    assert_(not any(sum(w) == b for w in itertools.product(*ranges)))
+                    infeasible_count += 1
+            else:
+                # Check the simplified decision problem agrees
+                X_simplified = solve_diophantine(A, U, b, simplify=1)
+                assert_(X_simplified is not None, (A, U, b, X_simplified))
+
+                # Check validity
+                assert_(sum(a*x for a, x in zip(A, X)) == b)
+                assert_(all(0 <= x <= ub for x, ub in zip(X, U)))
+                feasible_count += 1
+
+
+def test_diophantine_overflow():
+    # Smoke test integer overflow detection
+    max_intp = np.iinfo(np.intp).max
+    max_int64 = np.iinfo(np.int64).max
+
+    if max_int64 <= max_intp:
+        # Check that the algorithm works internally in 128-bit;
+        # solving this problem requires large intermediate numbers
+        A = (max_int64//2, max_int64//2 - 10)
+        U = (max_int64//2, max_int64//2 - 10)
+        b = 2*(max_int64//2) - 10
+
+        assert_equal(solve_diophantine(A, U, b), (1, 1))
+
+
+def check_may_share_memory_exact(a, b):
+    got = np.may_share_memory(a, b, max_work=MAY_SHARE_EXACT)
+
+    assert_equal(np.may_share_memory(a, b),
+                 np.may_share_memory(a, b, max_work=MAY_SHARE_BOUNDS))
+
+    a.fill(0)
+    b.fill(0)
+    a.fill(1)
+    exact = b.any()
+
+    err_msg = ""
+    if got != exact:
+        err_msg = "    " + "\n    ".join([
+            "base_a - base_b = %r" % (a.__array_interface__['data'][0] - b.__array_interface__['data'][0],),
+            "shape_a = %r" % (a.shape,),
+            "shape_b = %r" % (b.shape,),
+            "strides_a = %r" % (a.strides,),
+            "strides_b = %r" % (b.strides,),
+            "size_a = %r" % (a.size,),
+            "size_b = %r" % (b.size,)
+        ])
+
+    assert_equal(got, exact, err_msg=err_msg)
+
+
+def test_may_share_memory_manual():
+    # Manual test cases for may_share_memory
+
+    # Base arrays
+    xs0 = [
+        np.zeros([13, 21, 23, 22], dtype=np.int8),
+        np.zeros([13, 21, 23*2, 22], dtype=np.int8)[:,:,::2,:]
+    ]
+
+    # Generate all negative stride combinations
+    xs = []
+    for x in xs0:
+        for ss in itertools.product(*(([slice(None), slice(None, None, -1)],)*4)):
+            xp = x[ss]
+            xs.append(xp)
+
+    for x in xs:
+        # The default is a simple extent check
+        assert_(np.may_share_memory(x[:,0,:], x[:,1,:]))
+        assert_(np.may_share_memory(x[:,0,:], x[:,1,:], max_work=None))
+
+        # Exact checks
+        check_may_share_memory_exact(x[:,0,:], x[:,1,:])
+        check_may_share_memory_exact(x[:,::7], x[:,3::3])
+
+        try:
+            xp = x.ravel()
+            if xp.flags.owndata:
+                continue
+            xp = xp.view(np.int16)
+        except ValueError:
+            continue
+
+        # 0-size arrays cannot overlap
+        check_may_share_memory_exact(x.ravel()[6:6],
+                                     xp.reshape(13, 21, 23, 11)[:,::7])
+
+        # Test itemsize is dealt with
+        check_may_share_memory_exact(x[:,::7],
+                                     xp.reshape(13, 21, 23, 11))
+        check_may_share_memory_exact(x[:,::7],
+                                     xp.reshape(13, 21, 23, 11)[:,3::3])
+        check_may_share_memory_exact(x.ravel()[6:7],
+                                     xp.reshape(13, 21, 23, 11)[:,::7])
+
+    # Check unit size
+    x = np.zeros([1], dtype=np.int8)
+    check_may_share_memory_exact(x, x)
+    check_may_share_memory_exact(x, x.copy())
+
+
+def iter_random_view_pairs(x, same_steps=True, equal_size=False):
+    rng = np.random.RandomState(1234)
+
+    if equal_size and same_steps:
+        raise ValueError
+
+    def random_slice(n, step):
+        start = rng.randint(0, n+1, dtype=np.intp)
+        stop = rng.randint(start, n+1, dtype=np.intp)
+        if rng.randint(0, 2, dtype=np.intp) == 0:
+            stop, start = start, stop
+            step *= -1
+        return slice(start, stop, step)
+
+    def random_slice_fixed_size(n, step, size):
+        start = rng.randint(0, n+1 - size*step)
+        stop = start + (size-1)*step + 1
+        if rng.randint(0, 2) == 0:
+            stop, start = start-1, stop-1
+            if stop < 0:
+                stop = None
+            step *= -1
+        return slice(start, stop, step)
+
+    # First a few regular views
+    yield x, x
+    for j in range(1, 7, 3):
+        yield x[j:], x[:-j]
+        yield x[...,j:], x[...,:-j]
+
+    # An array with zero stride internal overlap
+    strides = list(x.strides)
+    strides[0] = 0
+    xp = as_strided(x, shape=x.shape, strides=strides)
+    yield x, xp
+    yield xp, xp
+
+    # An array with non-zero stride internal overlap
+    strides = list(x.strides)
+    if strides[0] > 1:
+        strides[0] = 1
+    xp = as_strided(x, shape=x.shape, strides=strides)
+    yield x, xp
+    yield xp, xp
+
+    # Then discontiguous views
+    while True:
+        steps = tuple(rng.randint(1, 11, dtype=np.intp)
+                      if rng.randint(0, 5, dtype=np.intp) == 0 else 1
+                      for j in range(x.ndim))
+        s1 = tuple(random_slice(p, s) for p, s in zip(x.shape, steps))
+
+        t1 = np.arange(x.ndim)
+        rng.shuffle(t1)
+
+        if equal_size:
+            t2 = t1
+        else:
+            t2 = np.arange(x.ndim)
+            rng.shuffle(t2)
+
+        a = x[s1]
+
+        if equal_size:
+            if a.size == 0:
+                continue
+
+            steps2 = tuple(rng.randint(1, max(2, p//(1+pa)))
+                           if rng.randint(0, 5) == 0 else 1
+                           for p, s, pa in zip(x.shape, s1, a.shape))
+            s2 = tuple(random_slice_fixed_size(p, s, pa)
+                       for p, s, pa in zip(x.shape, steps2, a.shape))
+        elif same_steps:
+            steps2 = steps
+        else:
+            steps2 = tuple(rng.randint(1, 11, dtype=np.intp)
+                           if rng.randint(0, 5, dtype=np.intp) == 0 else 1
+                           for j in range(x.ndim))
+
+        if not equal_size:
+            s2 = tuple(random_slice(p, s) for p, s in zip(x.shape, steps2))
+
+        a = a.transpose(t1)
+        b = x[s2].transpose(t2)
+
+        yield a, b
+
+
+def check_may_share_memory_easy_fuzz(get_max_work, same_steps, min_count):
+    # Check that overlap problems with common strides are solved with
+    # little work.
+    x = np.zeros([17,34,71,97], dtype=np.int16)
+
+    feasible = 0
+    infeasible = 0
+
+    pair_iter = iter_random_view_pairs(x, same_steps)
+
+    while min(feasible, infeasible) < min_count:
+        a, b = next(pair_iter)
+
+        bounds_overlap = np.may_share_memory(a, b)
+        may_share_answer = np.may_share_memory(a, b)
+        easy_answer = np.may_share_memory(a, b, max_work=get_max_work(a, b))
+        exact_answer = np.may_share_memory(a, b, max_work=MAY_SHARE_EXACT)
+
+        if easy_answer != exact_answer:
+            # assert_equal is slow...
+            assert_equal(easy_answer, exact_answer)
+
+        if may_share_answer != bounds_overlap:
+            assert_equal(may_share_answer, bounds_overlap)
+
+        if bounds_overlap:
+            if exact_answer:
+                feasible += 1
+            else:
+                infeasible += 1
+
+
+@pytest.mark.slow
+def test_may_share_memory_easy_fuzz():
+    # Check that overlap problems with common strides are always
+    # solved with little work.
+
+    check_may_share_memory_easy_fuzz(get_max_work=lambda a, b: 1,
+                                     same_steps=True,
+                                     min_count=2000)
+
+
+@pytest.mark.slow
+def test_may_share_memory_harder_fuzz():
+    # Overlap problems with not necessarily common strides take more
+    # work.
+    #
+    # The work bound below can't be reduced much. Harder problems can
+    # also exist but not be detected here, as the set of problems
+    # comes from RNG.
+
+    check_may_share_memory_easy_fuzz(get_max_work=lambda a, b: max(a.size, b.size)//2,
+                                     same_steps=False,
+                                     min_count=2000)
+
+
+def test_shares_memory_api():
+    x = np.zeros([4, 5, 6], dtype=np.int8)
+
+    assert_equal(np.shares_memory(x, x), True)
+    assert_equal(np.shares_memory(x, x.copy()), False)
+
+    a = x[:,::2,::3]
+    b = x[:,::3,::2]
+    assert_equal(np.shares_memory(a, b), True)
+    assert_equal(np.shares_memory(a, b, max_work=None), True)
+    assert_raises(
+        np.exceptions.TooHardError, np.shares_memory, a, b, max_work=1
+    )
+
+
+def test_may_share_memory_bad_max_work():
+    x = np.zeros([1])
+    assert_raises(OverflowError, np.may_share_memory, x, x, max_work=10**100)
+    assert_raises(OverflowError, np.shares_memory, x, x, max_work=10**100)
+
+
+def test_internal_overlap_diophantine():
+    def check(A, U, exists=None):
+        X = solve_diophantine(A, U, 0, require_ub_nontrivial=1)
+
+        if exists is None:
+            exists = (X is not None)
+
+        if X is not None:
+            assert_(sum(a*x for a, x in zip(A, X)) == sum(a*u//2 for a, u in zip(A, U)))
+            assert_(all(0 <= x <= u for x, u in zip(X, U)))
+            assert_(any(x != u//2 for x, u in zip(X, U)))
+
+        if exists:
+            assert_(X is not None, repr(X))
+        else:
+            assert_(X is None, repr(X))
+
+    # Smoke tests
+    check((3, 2), (2*2, 3*2), exists=True)
+    check((3*2, 2), (15*2, (3-1)*2), exists=False)
+
+
+def test_internal_overlap_slices():
+    # Slicing an array never generates internal overlap
+
+    x = np.zeros([17,34,71,97], dtype=np.int16)
+
+    rng = np.random.RandomState(1234)
+
+    def random_slice(n, step):
+        start = rng.randint(0, n+1, dtype=np.intp)
+        stop = rng.randint(start, n+1, dtype=np.intp)
+        if rng.randint(0, 2, dtype=np.intp) == 0:
+            stop, start = start, stop
+            step *= -1
+        return slice(start, stop, step)
+
+    cases = 0
+    min_count = 5000
+
+    while cases < min_count:
+        steps = tuple(rng.randint(1, 11, dtype=np.intp)
+                      if rng.randint(0, 5, dtype=np.intp) == 0 else 1
+                      for j in range(x.ndim))
+        t1 = np.arange(x.ndim)
+        rng.shuffle(t1)
+        s1 = tuple(random_slice(p, s) for p, s in zip(x.shape, steps))
+        a = x[s1].transpose(t1)
+
+        assert_(not internal_overlap(a))
+        cases += 1
+
+
+def check_internal_overlap(a, manual_expected=None):
+    got = internal_overlap(a)
+
+    # Brute-force check
+    m = set()
+    ranges = tuple(range(n) for n in a.shape)
+    for v in itertools.product(*ranges):
+        offset = sum(s*w for s, w in zip(a.strides, v))
+        if offset in m:
+            expected = True
+            break
+        else:
+            m.add(offset)
+    else:
+        expected = False
+
+    # Compare
+    if got != expected:
+        assert_equal(got, expected, err_msg=repr((a.strides, a.shape)))
+    if manual_expected is not None and expected != manual_expected:
+        assert_equal(expected, manual_expected)
+    return got
+
+
+def test_internal_overlap_manual():
+    # Stride tricks can construct arrays with internal overlap
+
+    # We don't care about memory bounds, the array is not
+    # read/write accessed
+    x = np.arange(1).astype(np.int8)
+
+    # Check low-dimensional special cases
+
+    check_internal_overlap(x, False) # 1-dim
+    check_internal_overlap(x.reshape([]), False) # 0-dim
+
+    a = as_strided(x, strides=(3, 4), shape=(4, 4))
+    check_internal_overlap(a, False)
+
+    a = as_strided(x, strides=(3, 4), shape=(5, 4))
+    check_internal_overlap(a, True)
+
+    a = as_strided(x, strides=(0,), shape=(0,))
+    check_internal_overlap(a, False)
+
+    a = as_strided(x, strides=(0,), shape=(1,))
+    check_internal_overlap(a, False)
+
+    a = as_strided(x, strides=(0,), shape=(2,))
+    check_internal_overlap(a, True)
+
+    a = as_strided(x, strides=(0, -9993), shape=(87, 22))
+    check_internal_overlap(a, True)
+
+    a = as_strided(x, strides=(0, -9993), shape=(1, 22))
+    check_internal_overlap(a, False)
+
+    a = as_strided(x, strides=(0, -9993), shape=(0, 22))
+    check_internal_overlap(a, False)
+
+
+def test_internal_overlap_fuzz():
+    # Fuzz check; the brute-force check is fairly slow
+
+    x = np.arange(1).astype(np.int8)
+
+    overlap = 0
+    no_overlap = 0
+    min_count = 100
+
+    rng = np.random.RandomState(1234)
+
+    while min(overlap, no_overlap) < min_count:
+        ndim = rng.randint(1, 4, dtype=np.intp)
+
+        strides = tuple(rng.randint(-1000, 1000, dtype=np.intp)
+                        for j in range(ndim))
+        shape = tuple(rng.randint(1, 30, dtype=np.intp)
+                      for j in range(ndim))
+
+        a = as_strided(x, strides=strides, shape=shape)
+        result = check_internal_overlap(a)
+
+        if result:
+            overlap += 1
+        else:
+            no_overlap += 1
+
+
+def test_non_ndarray_inputs():
+    # Regression check for gh-5604
+
+    class MyArray:
+        def __init__(self, data):
+            self.data = data
+
+        @property
+        def __array_interface__(self):
+            return self.data.__array_interface__
+
+    class MyArray2:
+        def __init__(self, data):
+            self.data = data
+
+        def __array__(self, dtype=None, copy=None):
+            return self.data
+
+    for cls in [MyArray, MyArray2]:
+        x = np.arange(5)
+
+        assert_(np.may_share_memory(cls(x[::2]), x[1::2]))
+        assert_(not np.shares_memory(cls(x[::2]), x[1::2]))
+
+        assert_(np.shares_memory(cls(x[1::3]), x[::2]))
+        assert_(np.may_share_memory(cls(x[1::3]), x[::2]))
+
+
+def view_element_first_byte(x):
+    """Construct an array viewing the first byte of each element of `x`"""
+    from numpy.lib._stride_tricks_impl import DummyArray
+    interface = dict(x.__array_interface__)
+    interface['typestr'] = '|b1'
+    interface['descr'] = [('', '|b1')]
+    return np.asarray(DummyArray(interface, x))
+
+
+def assert_copy_equivalent(operation, args, out, **kwargs):
+    """
+    Check that operation(*args, out=out) produces results
+    equivalent to out[...] = operation(*args, out=out.copy())
+    """
+
+    kwargs['out'] = out
+    kwargs2 = dict(kwargs)
+    kwargs2['out'] = out.copy()
+
+    out_orig = out.copy()
+    out[...] = operation(*args, **kwargs2)
+    expected = out.copy()
+    out[...] = out_orig
+
+    got = operation(*args, **kwargs).copy()
+
+    if (got != expected).any():
+        assert_equal(got, expected)
+
+
+class TestUFunc:
+    """
+    Test ufunc call memory overlap handling
+    """
+
+    def check_unary_fuzz(self, operation, get_out_axis_size, dtype=np.int16,
+                             count=5000):
+        shapes = [7, 13, 8, 21, 29, 32]
+
+        rng = np.random.RandomState(1234)
+
+        for ndim in range(1, 6):
+            x = rng.randint(0, 2**16, size=shapes[:ndim]).astype(dtype)
+
+            it = iter_random_view_pairs(x, same_steps=False, equal_size=True)
+
+            min_count = count // (ndim + 1)**2
+
+            overlapping = 0
+            while overlapping < min_count:
+                a, b = next(it)
+
+                a_orig = a.copy()
+                b_orig = b.copy()
+
+                if get_out_axis_size is None:
+                    assert_copy_equivalent(operation, [a], out=b)
+
+                    if np.shares_memory(a, b):
+                        overlapping += 1
+                else:
+                    for axis in itertools.chain(range(ndim), [None]):
+                        a[...] = a_orig
+                        b[...] = b_orig
+
+                        # Determine size for reduction axis (None if scalar)
+                        outsize, scalarize = get_out_axis_size(a, b, axis)
+                        if outsize == 'skip':
+                            continue
+
+                        # Slice b to get an output array of the correct size
+                        sl = [slice(None)] * ndim
+                        if axis is None:
+                            if outsize is None:
+                                sl = [slice(0, 1)] + [0]*(ndim - 1)
+                            else:
+                                sl = [slice(0, outsize)] + [0]*(ndim - 1)
+                        else:
+                            if outsize is None:
+                                k = b.shape[axis]//2
+                                if ndim == 1:
+                                    sl[axis] = slice(k, k + 1)
+                                else:
+                                    sl[axis] = k
+                            else:
+                                assert b.shape[axis] >= outsize
+                                sl[axis] = slice(0, outsize)
+                        b_out = b[tuple(sl)]
+
+                        if scalarize:
+                            b_out = b_out.reshape([])
+
+                        if np.shares_memory(a, b_out):
+                            overlapping += 1
+
+                        # Check result
+                        assert_copy_equivalent(operation, [a], out=b_out, axis=axis)
+
+    @pytest.mark.slow
+    def test_unary_ufunc_call_fuzz(self):
+        self.check_unary_fuzz(np.invert, None, np.int16)
+
+    @pytest.mark.slow
+    def test_unary_ufunc_call_complex_fuzz(self):
+        # Complex typically has a smaller alignment than itemsize
+        self.check_unary_fuzz(np.negative, None, np.complex128, count=500)
+
+    def test_binary_ufunc_accumulate_fuzz(self):
+        def get_out_axis_size(a, b, axis):
+            if axis is None:
+                if a.ndim == 1:
+                    return a.size, False
+                else:
+                    return 'skip', False  # accumulate doesn't support this
+            else:
+                return a.shape[axis], False
+
+        self.check_unary_fuzz(np.add.accumulate, get_out_axis_size,
+                              dtype=np.int16, count=500)
+
+    def test_binary_ufunc_reduce_fuzz(self):
+        def get_out_axis_size(a, b, axis):
+            return None, (axis is None or a.ndim == 1)
+
+        self.check_unary_fuzz(np.add.reduce, get_out_axis_size,
+                              dtype=np.int16, count=500)
+
+    def test_binary_ufunc_reduceat_fuzz(self):
+        def get_out_axis_size(a, b, axis):
+            if axis is None:
+                if a.ndim == 1:
+                    return a.size, False
+                else:
+                    return 'skip', False  # reduceat doesn't support this
+            else:
+                return a.shape[axis], False
+
+        def do_reduceat(a, out, axis):
+            if axis is None:
+                size = len(a)
+                step = size//len(out)
+            else:
+                size = a.shape[axis]
+                step = a.shape[axis] // out.shape[axis]
+            idx = np.arange(0, size, step)
+            return np.add.reduceat(a, idx, out=out, axis=axis)
+
+        self.check_unary_fuzz(do_reduceat, get_out_axis_size,
+                              dtype=np.int16, count=500)
+
+    def test_binary_ufunc_reduceat_manual(self):
+        def check(ufunc, a, ind, out):
+            c1 = ufunc.reduceat(a.copy(), ind.copy(), out=out.copy())
+            c2 = ufunc.reduceat(a, ind, out=out)
+            assert_array_equal(c1, c2)
+
+        # Exactly same input/output arrays
+        a = np.arange(10000, dtype=np.int16)
+        check(np.add, a, a[::-1].copy(), a)
+
+        # Overlap with index
+        a = np.arange(10000, dtype=np.int16)
+        check(np.add, a, a[::-1], a)
+
+    @pytest.mark.slow
+    def test_unary_gufunc_fuzz(self):
+        shapes = [7, 13, 8, 21, 29, 32]
+        gufunc = _umath_tests.euclidean_pdist
+
+        rng = np.random.RandomState(1234)
+
+        for ndim in range(2, 6):
+            x = rng.rand(*shapes[:ndim])
+
+            it = iter_random_view_pairs(x, same_steps=False, equal_size=True)
+
+            min_count = 500 // (ndim + 1)**2
+
+            overlapping = 0
+            while overlapping < min_count:
+                a, b = next(it)
+
+                if min(a.shape[-2:]) < 2 or min(b.shape[-2:]) < 2 or a.shape[-1] < 2:
+                    continue
+
+                # Ensure the shapes are so that euclidean_pdist is happy
+                if b.shape[-1] > b.shape[-2]:
+                    b = b[...,0,:]
+                else:
+                    b = b[...,:,0]
+
+                n = a.shape[-2]
+                p = n * (n - 1) // 2
+                if p <= b.shape[-1] and p > 0:
+                    b = b[...,:p]
+                else:
+                    n = max(2, int(np.sqrt(b.shape[-1]))//2)
+                    p = n * (n - 1) // 2
+                    a = a[...,:n,:]
+                    b = b[...,:p]
+
+                # Call
+                if np.shares_memory(a, b):
+                    overlapping += 1
+
+                with np.errstate(over='ignore', invalid='ignore'):
+                    assert_copy_equivalent(gufunc, [a], out=b)
+
+    def test_ufunc_at_manual(self):
+        def check(ufunc, a, ind, b=None):
+            a0 = a.copy()
+            if b is None:
+                ufunc.at(a0, ind.copy())
+                c1 = a0.copy()
+                ufunc.at(a, ind)
+                c2 = a.copy()
+            else:
+                ufunc.at(a0, ind.copy(), b.copy())
+                c1 = a0.copy()
+                ufunc.at(a, ind, b)
+                c2 = a.copy()
+            assert_array_equal(c1, c2)
+
+        # Overlap with index
+        a = np.arange(10000, dtype=np.int16)
+        check(np.invert, a[::-1], a)
+
+        # Overlap with second data array
+        a = np.arange(100, dtype=np.int16)
+        ind = np.arange(0, 100, 2, dtype=np.int16)
+        check(np.add, a, ind, a[25:75])
+
+    def test_unary_ufunc_1d_manual(self):
+        # Exercise ufunc fast-paths (that avoid creation of an `np.nditer`)
+
+        def check(a, b):
+            a_orig = a.copy()
+            b_orig = b.copy()
+
+            b0 = b.copy()
+            c1 = ufunc(a, out=b0)
+            c2 = ufunc(a, out=b)
+            assert_array_equal(c1, c2)
+
+            # Trigger "fancy ufunc loop" code path
+            mask = view_element_first_byte(b).view(np.bool)
+
+            a[...] = a_orig
+            b[...] = b_orig
+            c1 = ufunc(a, out=b.copy(), where=mask.copy()).copy()
+
+            a[...] = a_orig
+            b[...] = b_orig
+            c2 = ufunc(a, out=b, where=mask.copy()).copy()
+
+            # Also, mask overlapping with output
+            a[...] = a_orig
+            b[...] = b_orig
+            c3 = ufunc(a, out=b, where=mask).copy()
+
+            assert_array_equal(c1, c2)
+            assert_array_equal(c1, c3)
+
+        dtypes = [np.int8, np.int16, np.int32, np.int64, np.float32,
+                  np.float64, np.complex64, np.complex128]
+        dtypes = [np.dtype(x) for x in dtypes]
+
+        for dtype in dtypes:
+            if np.issubdtype(dtype, np.integer):
+                ufunc = np.invert
+            else:
+                ufunc = np.reciprocal
+
+            n = 1000
+            k = 10
+            indices = [
+                np.index_exp[:n],
+                np.index_exp[k:k+n],
+                np.index_exp[n-1::-1],
+                np.index_exp[k+n-1:k-1:-1],
+                np.index_exp[:2*n:2],
+                np.index_exp[k:k+2*n:2],
+                np.index_exp[2*n-1::-2],
+                np.index_exp[k+2*n-1:k-1:-2],
+            ]
+
+            for xi, yi in itertools.product(indices, indices):
+                v = np.arange(1, 1 + n*2 + k, dtype=dtype)
+                x = v[xi]
+                y = v[yi]
+
+                with np.errstate(all='ignore'):
+                    check(x, y)
+
+                    # Scalar cases
+                    check(x[:1], y)
+                    check(x[-1:], y)
+                    check(x[:1].reshape([]), y)
+                    check(x[-1:].reshape([]), y)
+
+    def test_unary_ufunc_where_same(self):
+        # Check behavior at wheremask overlap
+        ufunc = np.invert
+
+        def check(a, out, mask):
+            c1 = ufunc(a, out=out.copy(), where=mask.copy())
+            c2 = ufunc(a, out=out, where=mask)
+            assert_array_equal(c1, c2)
+
+        # Check behavior with same input and output arrays
+        x = np.arange(100).astype(np.bool)
+        check(x, x, x)
+        check(x, x.copy(), x)
+        check(x, x, x.copy())
+
+    @pytest.mark.slow
+    def test_binary_ufunc_1d_manual(self):
+        ufunc = np.add
+
+        def check(a, b, c):
+            c0 = c.copy()
+            c1 = ufunc(a, b, out=c0)
+            c2 = ufunc(a, b, out=c)
+            assert_array_equal(c1, c2)
+
+        for dtype in [np.int8, np.int16, np.int32, np.int64,
+                      np.float32, np.float64, np.complex64, np.complex128]:
+            # Check different data dependency orders
+
+            n = 1000
+            k = 10
+
+            indices = []
+            for p in [1, 2]:
+                indices.extend([
+                    np.index_exp[:p*n:p],
+                    np.index_exp[k:k+p*n:p],
+                    np.index_exp[p*n-1::-p],
+                    np.index_exp[k+p*n-1:k-1:-p],
+                ])
+
+            for x, y, z in itertools.product(indices, indices, indices):
+                v = np.arange(6*n).astype(dtype)
+                x = v[x]
+                y = v[y]
+                z = v[z]
+
+                check(x, y, z)
+
+                # Scalar cases
+                check(x[:1], y, z)
+                check(x[-1:], y, z)
+                check(x[:1].reshape([]), y, z)
+                check(x[-1:].reshape([]), y, z)
+                check(x, y[:1], z)
+                check(x, y[-1:], z)
+                check(x, y[:1].reshape([]), z)
+                check(x, y[-1:].reshape([]), z)
+
+    def test_inplace_op_simple_manual(self):
+        rng = np.random.RandomState(1234)
+        x = rng.rand(200, 200)  # bigger than bufsize
+
+        x += x.T
+        assert_array_equal(x - x.T, 0)

mantis_evalkit/lib/python3.10/site-packages/numpy/_core/tests/test_mem_policy.py

@@ -0,0 +1,449 @@
+import asyncio
+import gc
+import os
+import sys
+import threading
+
+import pytest
+
+import numpy as np
+from numpy.testing import extbuild, assert_warns, IS_WASM, IS_EDITABLE
+from numpy._core.multiarray import get_handler_name
+
+
+@pytest.fixture
+def get_module(tmp_path):
+    """ Add a memory policy that returns a false pointer 64 bytes into the
+    actual allocation, and fill the prefix with some text. Then check at each
+    memory manipulation that the prefix exists, to make sure all alloc/realloc/
+    free/calloc go via the functions here.
+    """
+    if sys.platform.startswith('cygwin'):
+        pytest.skip('link fails on cygwin')
+    if IS_WASM:
+        pytest.skip("Can't build module inside Wasm")
+    if IS_EDITABLE:
+        pytest.skip("Can't build module for editable install")
+
+    functions = [
+        ("get_default_policy", "METH_NOARGS", """
+             Py_INCREF(PyDataMem_DefaultHandler);
+             return PyDataMem_DefaultHandler;
+         """),
+        ("set_secret_data_policy", "METH_NOARGS", """
+             PyObject *secret_data =
+                 PyCapsule_New(&secret_data_handler, "mem_handler", NULL);
+             if (secret_data == NULL) {
+                 return NULL;
+             }
+             PyObject *old = PyDataMem_SetHandler(secret_data);
+             Py_DECREF(secret_data);
+             return old;
+         """),
+        ("set_wrong_capsule_name_data_policy", "METH_NOARGS", """
+             PyObject *wrong_name_capsule =
+                 PyCapsule_New(&secret_data_handler, "not_mem_handler", NULL);
+             if (wrong_name_capsule == NULL) {
+                 return NULL;
+             }
+             PyObject *old = PyDataMem_SetHandler(wrong_name_capsule);
+             Py_DECREF(wrong_name_capsule);
+             return old;
+         """),
+        ("set_old_policy", "METH_O", """
+             PyObject *old;
+             if (args != NULL && PyCapsule_CheckExact(args)) {
+                 old = PyDataMem_SetHandler(args);
+             }
+             else {
+                 old = PyDataMem_SetHandler(NULL);
+             }
+             return old;
+         """),
+        ("get_array", "METH_NOARGS", """
+            char *buf = (char *)malloc(20);
+            npy_intp dims[1];
+            dims[0] = 20;
+            PyArray_Descr *descr =  PyArray_DescrNewFromType(NPY_UINT8);
+            return PyArray_NewFromDescr(&PyArray_Type, descr, 1, dims, NULL,
+                                        buf, NPY_ARRAY_WRITEABLE, NULL);
+         """),
+        ("set_own", "METH_O", """
+            if (!PyArray_Check(args)) {
+                PyErr_SetString(PyExc_ValueError,
+                             "need an ndarray");
+                return NULL;
+            }
+            PyArray_ENABLEFLAGS((PyArrayObject*)args, NPY_ARRAY_OWNDATA);
+            // Maybe try this too?
+            // PyArray_BASE(PyArrayObject *)args) = NULL;
+            Py_RETURN_NONE;
+         """),
+        ("get_array_with_base", "METH_NOARGS", """
+            char *buf = (char *)malloc(20);
+            npy_intp dims[1];
+            dims[0] = 20;
+            PyArray_Descr *descr =  PyArray_DescrNewFromType(NPY_UINT8);
+            PyObject *arr = PyArray_NewFromDescr(&PyArray_Type, descr, 1, dims,
+                                                 NULL, buf,
+                                                 NPY_ARRAY_WRITEABLE, NULL);
+            if (arr == NULL) return NULL;
+            PyObject *obj = PyCapsule_New(buf, "buf capsule",
+                                          (PyCapsule_Destructor)&warn_on_free);
+            if (obj == NULL) {
+                Py_DECREF(arr);
+                return NULL;
+            }
+            if (PyArray_SetBaseObject((PyArrayObject *)arr, obj) < 0) {
+                Py_DECREF(arr);
+                Py_DECREF(obj);
+                return NULL;
+            }
+            return arr;
+
+         """),
+    ]
+    prologue = '''
+        #define NPY_TARGET_VERSION NPY_1_22_API_VERSION
+        #define NPY_NO_DEPRECATED_API NPY_1_7_API_VERSION
+        #include <numpy/arrayobject.h>
+        /*
+         * This struct allows the dynamic configuration of the allocator funcs
+         * of the `secret_data_allocator`. It is provided here for
+         * demonstration purposes, as a valid `ctx` use-case scenario.
+         */
+        typedef struct {
+            void *(*malloc)(size_t);
+            void *(*calloc)(size_t, size_t);
+            void *(*realloc)(void *, size_t);
+            void (*free)(void *);
+        } SecretDataAllocatorFuncs;
+
+        NPY_NO_EXPORT void *
+        shift_alloc(void *ctx, size_t sz) {
+            SecretDataAllocatorFuncs *funcs = (SecretDataAllocatorFuncs *)ctx;
+            char *real = (char *)funcs->malloc(sz + 64);
+            if (real == NULL) {
+                return NULL;
+            }
+            snprintf(real, 64, "originally allocated %ld", (unsigned long)sz);
+            return (void *)(real + 64);
+        }
+        NPY_NO_EXPORT void *
+        shift_zero(void *ctx, size_t sz, size_t cnt) {
+            SecretDataAllocatorFuncs *funcs = (SecretDataAllocatorFuncs *)ctx;
+            char *real = (char *)funcs->calloc(sz + 64, cnt);
+            if (real == NULL) {
+                return NULL;
+            }
+            snprintf(real, 64, "originally allocated %ld via zero",
+                     (unsigned long)sz);
+            return (void *)(real + 64);
+        }
+        NPY_NO_EXPORT void
+        shift_free(void *ctx, void * p, npy_uintp sz) {
+            SecretDataAllocatorFuncs *funcs = (SecretDataAllocatorFuncs *)ctx;
+            if (p == NULL) {
+                return ;
+            }
+            char *real = (char *)p - 64;
+            if (strncmp(real, "originally allocated", 20) != 0) {
+                fprintf(stdout, "uh-oh, unmatched shift_free, "
+                        "no appropriate prefix\\n");
+                /* Make C runtime crash by calling free on the wrong address */
+                funcs->free((char *)p + 10);
+                /* funcs->free(real); */
+            }
+            else {
+                npy_uintp i = (npy_uintp)atoi(real +20);
+                if (i != sz) {
+                    fprintf(stderr, "uh-oh, unmatched shift_free"
+                            "(ptr, %ld) but allocated %ld\\n", sz, i);
+                    /* This happens in some places, only print */
+                    funcs->free(real);
+                }
+                else {
+                    funcs->free(real);
+                }
+            }
+        }
+        NPY_NO_EXPORT void *
+        shift_realloc(void *ctx, void * p, npy_uintp sz) {
+            SecretDataAllocatorFuncs *funcs = (SecretDataAllocatorFuncs *)ctx;
+            if (p != NULL) {
+                char *real = (char *)p - 64;
+                if (strncmp(real, "originally allocated", 20) != 0) {
+                    fprintf(stdout, "uh-oh, unmatched shift_realloc\\n");
+                    return realloc(p, sz);
+                }
+                return (void *)((char *)funcs->realloc(real, sz + 64) + 64);
+            }
+            else {
+                char *real = (char *)funcs->realloc(p, sz + 64);
+                if (real == NULL) {
+                    return NULL;
+                }
+                snprintf(real, 64, "originally allocated "
+                         "%ld  via realloc", (unsigned long)sz);
+                return (void *)(real + 64);
+            }
+        }
+        /* As an example, we use the standard {m|c|re}alloc/free funcs. */
+        static SecretDataAllocatorFuncs secret_data_handler_ctx = {
+            malloc,
+            calloc,
+            realloc,
+            free
+        };
+        static PyDataMem_Handler secret_data_handler = {
+            "secret_data_allocator",
+            1,
+            {
+                &secret_data_handler_ctx, /* ctx */
+                shift_alloc,              /* malloc */
+                shift_zero,               /* calloc */
+                shift_realloc,            /* realloc */
+                shift_free                /* free */
+            }
+        };
+        void warn_on_free(void *capsule) {
+            PyErr_WarnEx(PyExc_UserWarning, "in warn_on_free", 1);
+            void * obj = PyCapsule_GetPointer(capsule,
+                                              PyCapsule_GetName(capsule));
+            free(obj);
+        };
+        '''
+    more_init = "import_array();"
+    try:
+        import mem_policy
+        return mem_policy
+    except ImportError:
+        pass
+    # if it does not exist, build and load it
+    return extbuild.build_and_import_extension('mem_policy',
+                                               functions,
+                                               prologue=prologue,
+                                               include_dirs=[np.get_include()],
+                                               build_dir=tmp_path,
+                                               more_init=more_init)
+
+
+def test_set_policy(get_module):
+
+    get_handler_name = np._core.multiarray.get_handler_name
+    get_handler_version = np._core.multiarray.get_handler_version
+    orig_policy_name = get_handler_name()
+
+    a = np.arange(10).reshape((2, 5))  # a doesn't own its own data
+    assert get_handler_name(a) is None
+    assert get_handler_version(a) is None
+    assert get_handler_name(a.base) == orig_policy_name
+    assert get_handler_version(a.base) == 1
+
+    orig_policy = get_module.set_secret_data_policy()
+
+    b = np.arange(10).reshape((2, 5))  # b doesn't own its own data
+    assert get_handler_name(b) is None
+    assert get_handler_version(b) is None
+    assert get_handler_name(b.base) == 'secret_data_allocator'
+    assert get_handler_version(b.base) == 1
+
+    if orig_policy_name == 'default_allocator':
+        get_module.set_old_policy(None)  # tests PyDataMem_SetHandler(NULL)
+        assert get_handler_name() == 'default_allocator'
+    else:
+        get_module.set_old_policy(orig_policy)
+        assert get_handler_name() == orig_policy_name
+
+    with pytest.raises(ValueError,
+                       match="Capsule must be named 'mem_handler'"):
+        get_module.set_wrong_capsule_name_data_policy()
+
+
+def test_default_policy_singleton(get_module):
+    get_handler_name = np._core.multiarray.get_handler_name
+
+    # set the policy to default
+    orig_policy = get_module.set_old_policy(None)
+
+    assert get_handler_name() == 'default_allocator'
+
+    # re-set the policy to default
+    def_policy_1 = get_module.set_old_policy(None)
+
+    assert get_handler_name() == 'default_allocator'
+
+    # set the policy to original
+    def_policy_2 = get_module.set_old_policy(orig_policy)
+
+    # since default policy is a singleton,
+    # these should be the same object
+    assert def_policy_1 is def_policy_2 is get_module.get_default_policy()
+
+
+def test_policy_propagation(get_module):
+    # The memory policy goes hand-in-hand with flags.owndata
+
+    class MyArr(np.ndarray):
+        pass
+
+    get_handler_name = np._core.multiarray.get_handler_name
+    orig_policy_name = get_handler_name()
+    a = np.arange(10).view(MyArr).reshape((2, 5))
+    assert get_handler_name(a) is None
+    assert a.flags.owndata is False
+
+    assert get_handler_name(a.base) is None
+    assert a.base.flags.owndata is False
+
+    assert get_handler_name(a.base.base) == orig_policy_name
+    assert a.base.base.flags.owndata is True
+
+
+async def concurrent_context1(get_module, orig_policy_name, event):
+    if orig_policy_name == 'default_allocator':
+        get_module.set_secret_data_policy()
+        assert get_handler_name() == 'secret_data_allocator'
+    else:
+        get_module.set_old_policy(None)
+        assert get_handler_name() == 'default_allocator'
+    event.set()
+
+
+async def concurrent_context2(get_module, orig_policy_name, event):
+    await event.wait()
+    # the policy is not affected by changes in parallel contexts
+    assert get_handler_name() == orig_policy_name
+    # change policy in the child context
+    if orig_policy_name == 'default_allocator':
+        get_module.set_secret_data_policy()
+        assert get_handler_name() == 'secret_data_allocator'
+    else:
+        get_module.set_old_policy(None)
+        assert get_handler_name() == 'default_allocator'
+
+
+async def async_test_context_locality(get_module):
+    orig_policy_name = np._core.multiarray.get_handler_name()
+
+    event = asyncio.Event()
+    # the child contexts inherit the parent policy
+    concurrent_task1 = asyncio.create_task(
+        concurrent_context1(get_module, orig_policy_name, event))
+    concurrent_task2 = asyncio.create_task(
+        concurrent_context2(get_module, orig_policy_name, event))
+    await concurrent_task1
+    await concurrent_task2
+
+    # the parent context is not affected by child policy changes
+    assert np._core.multiarray.get_handler_name() == orig_policy_name
+
+
+def test_context_locality(get_module):
+    if (sys.implementation.name == 'pypy'
+            and sys.pypy_version_info[:3] < (7, 3, 6)):
+        pytest.skip('no context-locality support in PyPy < 7.3.6')
+    asyncio.run(async_test_context_locality(get_module))
+
+
+def concurrent_thread1(get_module, event):
+    get_module.set_secret_data_policy()
+    assert np._core.multiarray.get_handler_name() == 'secret_data_allocator'
+    event.set()
+
+
+def concurrent_thread2(get_module, event):
+    event.wait()
+    # the policy is not affected by changes in parallel threads
+    assert np._core.multiarray.get_handler_name() == 'default_allocator'
+    # change policy in the child thread
+    get_module.set_secret_data_policy()
+
+
+def test_thread_locality(get_module):
+    orig_policy_name = np._core.multiarray.get_handler_name()
+
+    event = threading.Event()
+    # the child threads do not inherit the parent policy
+    concurrent_task1 = threading.Thread(target=concurrent_thread1,
+                                        args=(get_module, event))
+    concurrent_task2 = threading.Thread(target=concurrent_thread2,
+                                        args=(get_module, event))
+    concurrent_task1.start()
+    concurrent_task2.start()
+    concurrent_task1.join()
+    concurrent_task2.join()
+
+    # the parent thread is not affected by child policy changes
+    assert np._core.multiarray.get_handler_name() == orig_policy_name
+
+
+@pytest.mark.skip(reason="too slow, see gh-23975")
+def test_new_policy(get_module):
+    a = np.arange(10)
+    orig_policy_name = np._core.multiarray.get_handler_name(a)
+
+    orig_policy = get_module.set_secret_data_policy()
+
+    b = np.arange(10)
+    assert np._core.multiarray.get_handler_name(b) == 'secret_data_allocator'
+
+    # test array manipulation. This is slow
+    if orig_policy_name == 'default_allocator':
+        # when the np._core.test tests recurse into this test, the
+        # policy will be set so this "if" will be false, preventing
+        # infinite recursion
+        #
+        # if needed, debug this by
+        # - running tests with -- -s (to not capture stdout/stderr
+        # - setting verbose=2
+        # - setting extra_argv=['-vv'] here
+        assert np._core.test('full', verbose=1, extra_argv=[])
+        # also try the ma tests, the pickling test is quite tricky
+        assert np.ma.test('full', verbose=1, extra_argv=[])
+
+    get_module.set_old_policy(orig_policy)
+
+    c = np.arange(10)
+    assert np._core.multiarray.get_handler_name(c) == orig_policy_name
+
+
+@pytest.mark.xfail(sys.implementation.name == "pypy",
+                   reason=("bad interaction between getenv and "
+                           "os.environ inside pytest"))
+@pytest.mark.parametrize("policy", ["0", "1", None])
+def test_switch_owner(get_module, policy):
+    a = get_module.get_array()
+    assert np._core.multiarray.get_handler_name(a) is None
+    get_module.set_own(a)
+
+    if policy is None:
+        # See what we expect to be set based on the env variable
+        policy = os.getenv("NUMPY_WARN_IF_NO_MEM_POLICY", "0") == "1"
+        oldval = None
+    else:
+        policy = policy == "1"
+        oldval = np._core._multiarray_umath._set_numpy_warn_if_no_mem_policy(
+            policy)
+    try:
+        # The policy should be NULL, so we have to assume we can call
+        # "free".  A warning is given if the policy == "1"
+        if policy:
+            with assert_warns(RuntimeWarning) as w:
+                del a
+                gc.collect()
+        else:
+            del a
+            gc.collect()
+
+    finally:
+        if oldval is not None:
+            np._core._multiarray_umath._set_numpy_warn_if_no_mem_policy(oldval)
+
+
+def test_owner_is_base(get_module):
+    a = get_module.get_array_with_base()
+    with pytest.warns(UserWarning, match='warn_on_free'):
+        del a
+        gc.collect()
+        gc.collect()

mantis_evalkit/lib/python3.10/site-packages/numpy/_core/tests/test_memmap.py

@@ -0,0 +1,230 @@
+import sys
+import os
+import mmap
+import pytest
+from pathlib import Path
+from tempfile import NamedTemporaryFile, TemporaryFile
+
+from numpy import (
+    memmap, sum, average, prod, ndarray, isscalar, add, subtract, multiply)
+
+from numpy import arange, allclose, asarray
+from numpy.testing import (
+    assert_, assert_equal, assert_array_equal, suppress_warnings, IS_PYPY,
+    break_cycles
+    )
+
+class TestMemmap:
+    def setup_method(self):
+        self.tmpfp = NamedTemporaryFile(prefix='mmap')
+        self.shape = (3, 4)
+        self.dtype = 'float32'
+        self.data = arange(12, dtype=self.dtype)
+        self.data.resize(self.shape)
+
+    def teardown_method(self):
+        self.tmpfp.close()
+        self.data = None
+        if IS_PYPY:
+            break_cycles()
+            break_cycles()
+
+    def test_roundtrip(self):
+        # Write data to file
+        fp = memmap(self.tmpfp, dtype=self.dtype, mode='w+',
+                    shape=self.shape)
+        fp[:] = self.data[:]
+        del fp  # Test __del__ machinery, which handles cleanup
+
+        # Read data back from file
+        newfp = memmap(self.tmpfp, dtype=self.dtype, mode='r',
+                       shape=self.shape)
+        assert_(allclose(self.data, newfp))
+        assert_array_equal(self.data, newfp)
+        assert_equal(newfp.flags.writeable, False)
+
+    def test_open_with_filename(self, tmp_path):
+        tmpname = tmp_path / 'mmap'
+        fp = memmap(tmpname, dtype=self.dtype, mode='w+',
+                       shape=self.shape)
+        fp[:] = self.data[:]
+        del fp
+
+    def test_unnamed_file(self):
+        with TemporaryFile() as f:
+            fp = memmap(f, dtype=self.dtype, shape=self.shape)
+            del fp
+
+    def test_attributes(self):
+        offset = 1
+        mode = "w+"
+        fp = memmap(self.tmpfp, dtype=self.dtype, mode=mode,
+                    shape=self.shape, offset=offset)
+        assert_equal(offset, fp.offset)
+        assert_equal(mode, fp.mode)
+        del fp
+
+    def test_filename(self, tmp_path):
+        tmpname = tmp_path / "mmap"
+        fp = memmap(tmpname, dtype=self.dtype, mode='w+',
+                       shape=self.shape)
+        abspath = Path(os.path.abspath(tmpname))
+        fp[:] = self.data[:]
+        assert_equal(abspath, fp.filename)
+        b = fp[:1]
+        assert_equal(abspath, b.filename)
+        del b
+        del fp
+
+    def test_path(self, tmp_path):
+        tmpname = tmp_path / "mmap"
+        fp = memmap(Path(tmpname), dtype=self.dtype, mode='w+',
+                       shape=self.shape)
+        # os.path.realpath does not resolve symlinks on Windows
+        # see: https://bugs.python.org/issue9949
+        # use Path.resolve, just as memmap class does internally
+        abspath = str(Path(tmpname).resolve())
+        fp[:] = self.data[:]
+        assert_equal(abspath, str(fp.filename.resolve()))
+        b = fp[:1]
+        assert_equal(abspath, str(b.filename.resolve()))
+        del b
+        del fp
+
+    def test_filename_fileobj(self):
+        fp = memmap(self.tmpfp, dtype=self.dtype, mode="w+",
+                    shape=self.shape)
+        assert_equal(fp.filename, self.tmpfp.name)
+
+    @pytest.mark.skipif(sys.platform == 'gnu0',
+                        reason="Known to fail on hurd")
+    def test_flush(self):
+        fp = memmap(self.tmpfp, dtype=self.dtype, mode='w+',
+                    shape=self.shape)
+        fp[:] = self.data[:]
+        assert_equal(fp[0], self.data[0])
+        fp.flush()
+
+    def test_del(self):
+        # Make sure a view does not delete the underlying mmap
+        fp_base = memmap(self.tmpfp, dtype=self.dtype, mode='w+',
+                    shape=self.shape)
+        fp_base[0] = 5
+        fp_view = fp_base[0:1]
+        assert_equal(fp_view[0], 5)
+        del fp_view
+        # Should still be able to access and assign values after
+        # deleting the view
+        assert_equal(fp_base[0], 5)
+        fp_base[0] = 6
+        assert_equal(fp_base[0], 6)
+
+    def test_arithmetic_drops_references(self):
+        fp = memmap(self.tmpfp, dtype=self.dtype, mode='w+',
+                    shape=self.shape)
+        tmp = (fp + 10)
+        if isinstance(tmp, memmap):
+            assert_(tmp._mmap is not fp._mmap)
+
+    def test_indexing_drops_references(self):
+        fp = memmap(self.tmpfp, dtype=self.dtype, mode='w+',
+                    shape=self.shape)
+        tmp = fp[(1, 2), (2, 3)]
+        if isinstance(tmp, memmap):
+            assert_(tmp._mmap is not fp._mmap)
+
+    def test_slicing_keeps_references(self):
+        fp = memmap(self.tmpfp, dtype=self.dtype, mode='w+',
+                    shape=self.shape)
+        assert_(fp[:2, :2]._mmap is fp._mmap)
+
+    def test_view(self):
+        fp = memmap(self.tmpfp, dtype=self.dtype, shape=self.shape)
+        new1 = fp.view()
+        new2 = new1.view()
+        assert_(new1.base is fp)
+        assert_(new2.base is fp)
+        new_array = asarray(fp)
+        assert_(new_array.base is fp)
+
+    def test_ufunc_return_ndarray(self):
+        fp = memmap(self.tmpfp, dtype=self.dtype, shape=self.shape)
+        fp[:] = self.data
+
+        with suppress_warnings() as sup:
+            sup.filter(FutureWarning, "np.average currently does not preserve")
+            for unary_op in [sum, average, prod]:
+                result = unary_op(fp)
+                assert_(isscalar(result))
+                assert_(result.__class__ is self.data[0, 0].__class__)
+
+                assert_(unary_op(fp, axis=0).__class__ is ndarray)
+                assert_(unary_op(fp, axis=1).__class__ is ndarray)
+
+        for binary_op in [add, subtract, multiply]:
+            assert_(binary_op(fp, self.data).__class__ is ndarray)
+            assert_(binary_op(self.data, fp).__class__ is ndarray)
+            assert_(binary_op(fp, fp).__class__ is ndarray)
+
+        fp += 1
+        assert(fp.__class__ is memmap)
+        add(fp, 1, out=fp)
+        assert(fp.__class__ is memmap)
+
+    def test_getitem(self):
+        fp = memmap(self.tmpfp, dtype=self.dtype, shape=self.shape)
+        fp[:] = self.data
+
+        assert_(fp[1:, :-1].__class__ is memmap)
+        # Fancy indexing returns a copy that is not memmapped
+        assert_(fp[[0, 1]].__class__ is ndarray)
+
+    def test_memmap_subclass(self):
+        class MemmapSubClass(memmap):
+            pass
+
+        fp = MemmapSubClass(self.tmpfp, dtype=self.dtype, shape=self.shape)
+        fp[:] = self.data
+
+        # We keep previous behavior for subclasses of memmap, i.e. the
+        # ufunc and __getitem__ output is never turned into a ndarray
+        assert_(sum(fp, axis=0).__class__ is MemmapSubClass)
+        assert_(sum(fp).__class__ is MemmapSubClass)
+        assert_(fp[1:, :-1].__class__ is MemmapSubClass)
+        assert(fp[[0, 1]].__class__ is MemmapSubClass)
+
+    def test_mmap_offset_greater_than_allocation_granularity(self):
+        size = 5 * mmap.ALLOCATIONGRANULARITY
+        offset = mmap.ALLOCATIONGRANULARITY + 1
+        fp = memmap(self.tmpfp, shape=size, mode='w+', offset=offset)
+        assert_(fp.offset == offset)
+
+    def test_empty_array_with_offset_multiple_of_allocation_granularity(self):
+        self.tmpfp.write(b'a'*mmap.ALLOCATIONGRANULARITY)
+        size = 0
+        offset = mmap.ALLOCATIONGRANULARITY
+        fp = memmap(self.tmpfp, shape=size, mode='w+', offset=offset)
+        assert_equal(fp.offset, offset)
+
+    def test_no_shape(self):
+        self.tmpfp.write(b'a'*16)
+        mm = memmap(self.tmpfp, dtype='float64')
+        assert_equal(mm.shape, (2,))
+
+    def test_empty_array(self):
+        # gh-12653
+        with pytest.raises(ValueError, match='empty file'):
+            memmap(self.tmpfp, shape=(0, 4), mode='r')
+
+        # gh-27723
+        # empty memmap works with mode in ('w+','r+')
+        memmap(self.tmpfp, shape=(0, 4), mode='w+')
+
+        # ok now the file is not empty
+        memmap(self.tmpfp, shape=(0, 4), mode='w+')
+
+    def test_shape_type(self):
+        memmap(self.tmpfp, shape=3, mode='w+')
+        memmap(self.tmpfp, shape=self.shape, mode='w+')
+        memmap(self.tmpfp, shape=list(self.shape), mode='w+')
+        memmap(self.tmpfp, shape=asarray(self.shape), mode='w+')

mantis_evalkit/lib/python3.10/site-packages/numpy/_core/tests/test_numerictypes.py

@@ -0,0 +1,620 @@
+import sys
+import itertools
+
+import pytest
+import numpy as np
+import numpy._core.numerictypes as nt
+from numpy._core.numerictypes import (
+    issctype, sctype2char, maximum_sctype, sctypes
+)
+from numpy.testing import (
+    assert_, assert_equal, assert_raises, assert_raises_regex, IS_PYPY
+)
+
+# This is the structure of the table used for plain objects:
+#
+# +-+-+-+
+# |x|y|z|
+# +-+-+-+
+
+# Structure of a plain array description:
+Pdescr = [
+    ('x', 'i4', (2,)),
+    ('y', 'f8', (2, 2)),
+    ('z', 'u1')]
+
+# A plain list of tuples with values for testing:
+PbufferT = [
+    # x     y                  z
+    ([3, 2], [[6., 4.], [6., 4.]], 8),
+    ([4, 3], [[7., 5.], [7., 5.]], 9),
+    ]
+
+
+# This is the structure of the table used for nested objects (DON'T PANIC!):
+#
+# +-+---------------------------------+-----+----------+-+-+
+# |x|Info                             |color|info      |y|z|
+# | +-----+--+----------------+----+--+     +----+-----+ | |
+# | |value|y2|Info2           |name|z2|     |Name|Value| | |
+# | |     |  +----+-----+--+--+    |  |     |    |     | | |
+# | |     |  |name|value|y3|z3|    |  |     |    |     | | |
+# +-+-----+--+----+-----+--+--+----+--+-----+----+-----+-+-+
+#
+
+# The corresponding nested array description:
+Ndescr = [
+    ('x', 'i4', (2,)),
+    ('Info', [
+        ('value', 'c16'),
+        ('y2', 'f8'),
+        ('Info2', [
+            ('name', 'S2'),
+            ('value', 'c16', (2,)),
+            ('y3', 'f8', (2,)),
+            ('z3', 'u4', (2,))]),
+        ('name', 'S2'),
+        ('z2', 'b1')]),
+    ('color', 'S2'),
+    ('info', [
+        ('Name', 'U8'),
+        ('Value', 'c16')]),
+    ('y', 'f8', (2, 2)),
+    ('z', 'u1')]
+
+NbufferT = [
+    # x     Info                                                color info        y                  z
+    #       value y2 Info2                            name z2         Name Value
+    #                name   value    y3       z3
+    ([3, 2], (6j, 6., (b'nn', [6j, 4j], [6., 4.], [1, 2]), b'NN', True),
+     b'cc', ('NN', 6j), [[6., 4.], [6., 4.]], 8),
+    ([4, 3], (7j, 7., (b'oo', [7j, 5j], [7., 5.], [2, 1]), b'OO', False),
+     b'dd', ('OO', 7j), [[7., 5.], [7., 5.]], 9),
+    ]
+
+
+byteorder = {'little':'<', 'big':'>'}[sys.byteorder]
+
+def normalize_descr(descr):
+    "Normalize a description adding the platform byteorder."
+
+    out = []
+    for item in descr:
+        dtype = item[1]
+        if isinstance(dtype, str):
+            if dtype[0] not in ['|', '<', '>']:
+                onebyte = dtype[1:] == "1"
+                if onebyte or dtype[0] in ['S', 'V', 'b']:
+                    dtype = "|" + dtype
+                else:
+                    dtype = byteorder + dtype
+            if len(item) > 2 and np.prod(item[2]) > 1:
+                nitem = (item[0], dtype, item[2])
+            else:
+                nitem = (item[0], dtype)
+            out.append(nitem)
+        elif isinstance(dtype, list):
+            l = normalize_descr(dtype)
+            out.append((item[0], l))
+        else:
+            raise ValueError("Expected a str or list and got %s" %
+                             (type(item)))
+    return out
+
+
+############################################################
+#    Creation tests
+############################################################
+
+class CreateZeros:
+    """Check the creation of heterogeneous arrays zero-valued"""
+
+    def test_zeros0D(self):
+        """Check creation of 0-dimensional objects"""
+        h = np.zeros((), dtype=self._descr)
+        assert_(normalize_descr(self._descr) == h.dtype.descr)
+        assert_(h.dtype.fields['x'][0].name[:4] == 'void')
+        assert_(h.dtype.fields['x'][0].char == 'V')
+        assert_(h.dtype.fields['x'][0].type == np.void)
+        # A small check that data is ok
+        assert_equal(h['z'], np.zeros((), dtype='u1'))
+
+    def test_zerosSD(self):
+        """Check creation of single-dimensional objects"""
+        h = np.zeros((2,), dtype=self._descr)
+        assert_(normalize_descr(self._descr) == h.dtype.descr)
+        assert_(h.dtype['y'].name[:4] == 'void')
+        assert_(h.dtype['y'].char == 'V')
+        assert_(h.dtype['y'].type == np.void)
+        # A small check that data is ok
+        assert_equal(h['z'], np.zeros((2,), dtype='u1'))
+
+    def test_zerosMD(self):
+        """Check creation of multi-dimensional objects"""
+        h = np.zeros((2, 3), dtype=self._descr)
+        assert_(normalize_descr(self._descr) == h.dtype.descr)
+        assert_(h.dtype['z'].name == 'uint8')
+        assert_(h.dtype['z'].char == 'B')
+        assert_(h.dtype['z'].type == np.uint8)
+        # A small check that data is ok
+        assert_equal(h['z'], np.zeros((2, 3), dtype='u1'))
+
+
+class TestCreateZerosPlain(CreateZeros):
+    """Check the creation of heterogeneous arrays zero-valued (plain)"""
+    _descr = Pdescr
+
+class TestCreateZerosNested(CreateZeros):
+    """Check the creation of heterogeneous arrays zero-valued (nested)"""
+    _descr = Ndescr
+
+
+class CreateValues:
+    """Check the creation of heterogeneous arrays with values"""
+
+    def test_tuple(self):
+        """Check creation from tuples"""
+        h = np.array(self._buffer, dtype=self._descr)
+        assert_(normalize_descr(self._descr) == h.dtype.descr)
+        if self.multiple_rows:
+            assert_(h.shape == (2,))
+        else:
+            assert_(h.shape == ())
+
+    def test_list_of_tuple(self):
+        """Check creation from list of tuples"""
+        h = np.array([self._buffer], dtype=self._descr)
+        assert_(normalize_descr(self._descr) == h.dtype.descr)
+        if self.multiple_rows:
+            assert_(h.shape == (1, 2))
+        else:
+            assert_(h.shape == (1,))
+
+    def test_list_of_list_of_tuple(self):
+        """Check creation from list of list of tuples"""
+        h = np.array([[self._buffer]], dtype=self._descr)
+        assert_(normalize_descr(self._descr) == h.dtype.descr)
+        if self.multiple_rows:
+            assert_(h.shape == (1, 1, 2))
+        else:
+            assert_(h.shape == (1, 1))
+
+
+class TestCreateValuesPlainSingle(CreateValues):
+    """Check the creation of heterogeneous arrays (plain, single row)"""
+    _descr = Pdescr
+    multiple_rows = 0
+    _buffer = PbufferT[0]
+
+class TestCreateValuesPlainMultiple(CreateValues):
+    """Check the creation of heterogeneous arrays (plain, multiple rows)"""
+    _descr = Pdescr
+    multiple_rows = 1
+    _buffer = PbufferT
+
+class TestCreateValuesNestedSingle(CreateValues):
+    """Check the creation of heterogeneous arrays (nested, single row)"""
+    _descr = Ndescr
+    multiple_rows = 0
+    _buffer = NbufferT[0]
+
+class TestCreateValuesNestedMultiple(CreateValues):
+    """Check the creation of heterogeneous arrays (nested, multiple rows)"""
+    _descr = Ndescr
+    multiple_rows = 1
+    _buffer = NbufferT
+
+
+############################################################
+#    Reading tests
+############################################################
+
+class ReadValuesPlain:
+    """Check the reading of values in heterogeneous arrays (plain)"""
+
+    def test_access_fields(self):
+        h = np.array(self._buffer, dtype=self._descr)
+        if not self.multiple_rows:
+            assert_(h.shape == ())
+            assert_equal(h['x'], np.array(self._buffer[0], dtype='i4'))
+            assert_equal(h['y'], np.array(self._buffer[1], dtype='f8'))
+            assert_equal(h['z'], np.array(self._buffer[2], dtype='u1'))
+        else:
+            assert_(len(h) == 2)
+            assert_equal(h['x'], np.array([self._buffer[0][0],
+                                             self._buffer[1][0]], dtype='i4'))
+            assert_equal(h['y'], np.array([self._buffer[0][1],
+                                             self._buffer[1][1]], dtype='f8'))
+            assert_equal(h['z'], np.array([self._buffer[0][2],
+                                             self._buffer[1][2]], dtype='u1'))
+
+
+class TestReadValuesPlainSingle(ReadValuesPlain):
+    """Check the creation of heterogeneous arrays (plain, single row)"""
+    _descr = Pdescr
+    multiple_rows = 0
+    _buffer = PbufferT[0]
+
+class TestReadValuesPlainMultiple(ReadValuesPlain):
+    """Check the values of heterogeneous arrays (plain, multiple rows)"""
+    _descr = Pdescr
+    multiple_rows = 1
+    _buffer = PbufferT
+
+class ReadValuesNested:
+    """Check the reading of values in heterogeneous arrays (nested)"""
+
+    def test_access_top_fields(self):
+        """Check reading the top fields of a nested array"""
+        h = np.array(self._buffer, dtype=self._descr)
+        if not self.multiple_rows:
+            assert_(h.shape == ())
+            assert_equal(h['x'], np.array(self._buffer[0], dtype='i4'))
+            assert_equal(h['y'], np.array(self._buffer[4], dtype='f8'))
+            assert_equal(h['z'], np.array(self._buffer[5], dtype='u1'))
+        else:
+            assert_(len(h) == 2)
+            assert_equal(h['x'], np.array([self._buffer[0][0],
+                                           self._buffer[1][0]], dtype='i4'))
+            assert_equal(h['y'], np.array([self._buffer[0][4],
+                                           self._buffer[1][4]], dtype='f8'))
+            assert_equal(h['z'], np.array([self._buffer[0][5],
+                                           self._buffer[1][5]], dtype='u1'))
+
+    def test_nested1_acessors(self):
+        """Check reading the nested fields of a nested array (1st level)"""
+        h = np.array(self._buffer, dtype=self._descr)
+        if not self.multiple_rows:
+            assert_equal(h['Info']['value'],
+                         np.array(self._buffer[1][0], dtype='c16'))
+            assert_equal(h['Info']['y2'],
+                         np.array(self._buffer[1][1], dtype='f8'))
+            assert_equal(h['info']['Name'],
+                         np.array(self._buffer[3][0], dtype='U2'))
+            assert_equal(h['info']['Value'],
+                         np.array(self._buffer[3][1], dtype='c16'))
+        else:
+            assert_equal(h['Info']['value'],
+                         np.array([self._buffer[0][1][0],
+                                self._buffer[1][1][0]],
+                                dtype='c16'))
+            assert_equal(h['Info']['y2'],
+                         np.array([self._buffer[0][1][1],
+                                self._buffer[1][1][1]],
+                                dtype='f8'))
+            assert_equal(h['info']['Name'],
+                         np.array([self._buffer[0][3][0],
+                                self._buffer[1][3][0]],
+                               dtype='U2'))
+            assert_equal(h['info']['Value'],
+                         np.array([self._buffer[0][3][1],
+                                self._buffer[1][3][1]],
+                               dtype='c16'))
+
+    def test_nested2_acessors(self):
+        """Check reading the nested fields of a nested array (2nd level)"""
+        h = np.array(self._buffer, dtype=self._descr)
+        if not self.multiple_rows:
+            assert_equal(h['Info']['Info2']['value'],
+                         np.array(self._buffer[1][2][1], dtype='c16'))
+            assert_equal(h['Info']['Info2']['z3'],
+                         np.array(self._buffer[1][2][3], dtype='u4'))
+        else:
+            assert_equal(h['Info']['Info2']['value'],
+                         np.array([self._buffer[0][1][2][1],
+                                self._buffer[1][1][2][1]],
+                               dtype='c16'))
+            assert_equal(h['Info']['Info2']['z3'],
+                         np.array([self._buffer[0][1][2][3],
+                                self._buffer[1][1][2][3]],
+                               dtype='u4'))
+
+    def test_nested1_descriptor(self):
+        """Check access nested descriptors of a nested array (1st level)"""
+        h = np.array(self._buffer, dtype=self._descr)
+        assert_(h.dtype['Info']['value'].name == 'complex128')
+        assert_(h.dtype['Info']['y2'].name == 'float64')
+        assert_(h.dtype['info']['Name'].name == 'str256')
+        assert_(h.dtype['info']['Value'].name == 'complex128')
+
+    def test_nested2_descriptor(self):
+        """Check access nested descriptors of a nested array (2nd level)"""
+        h = np.array(self._buffer, dtype=self._descr)
+        assert_(h.dtype['Info']['Info2']['value'].name == 'void256')
+        assert_(h.dtype['Info']['Info2']['z3'].name == 'void64')
+
+
+class TestReadValuesNestedSingle(ReadValuesNested):
+    """Check the values of heterogeneous arrays (nested, single row)"""
+    _descr = Ndescr
+    multiple_rows = False
+    _buffer = NbufferT[0]
+
+class TestReadValuesNestedMultiple(ReadValuesNested):
+    """Check the values of heterogeneous arrays (nested, multiple rows)"""
+    _descr = Ndescr
+    multiple_rows = True
+    _buffer = NbufferT
+
+class TestEmptyField:
+    def test_assign(self):
+        a = np.arange(10, dtype=np.float32)
+        a.dtype = [("int",   "<0i4"), ("float", "<2f4")]
+        assert_(a['int'].shape == (5, 0))
+        assert_(a['float'].shape == (5, 2))
+
+
+class TestMultipleFields:
+    def setup_method(self):
+        self.ary = np.array([(1, 2, 3, 4), (5, 6, 7, 8)], dtype='i4,f4,i2,c8')
+
+    def _bad_call(self):
+        return self.ary['f0', 'f1']
+
+    def test_no_tuple(self):
+        assert_raises(IndexError, self._bad_call)
+
+    def test_return(self):
+        res = self.ary[['f0', 'f2']].tolist()
+        assert_(res == [(1, 3), (5, 7)])
+
+
+class TestIsSubDType:
+    # scalar types can be promoted into dtypes
+    wrappers = [np.dtype, lambda x: x]
+
+    def test_both_abstract(self):
+        assert_(np.issubdtype(np.floating, np.inexact))
+        assert_(not np.issubdtype(np.inexact, np.floating))
+
+    def test_same(self):
+        for cls in (np.float32, np.int32):
+            for w1, w2 in itertools.product(self.wrappers, repeat=2):
+                assert_(np.issubdtype(w1(cls), w2(cls)))
+
+    def test_subclass(self):
+        # note we cannot promote floating to a dtype, as it would turn into a
+        # concrete type
+        for w in self.wrappers:
+            assert_(np.issubdtype(w(np.float32), np.floating))
+            assert_(np.issubdtype(w(np.float64), np.floating))
+
+    def test_subclass_backwards(self):
+        for w in self.wrappers:
+            assert_(not np.issubdtype(np.floating, w(np.float32)))
+            assert_(not np.issubdtype(np.floating, w(np.float64)))
+
+    def test_sibling_class(self):
+        for w1, w2 in itertools.product(self.wrappers, repeat=2):
+            assert_(not np.issubdtype(w1(np.float32), w2(np.float64)))
+            assert_(not np.issubdtype(w1(np.float64), w2(np.float32)))
+
+    def test_nondtype_nonscalartype(self):
+        # See gh-14619 and gh-9505 which introduced the deprecation to fix
+        # this. These tests are directly taken from gh-9505
+        assert not np.issubdtype(np.float32, 'float64')
+        assert not np.issubdtype(np.float32, 'f8')
+        assert not np.issubdtype(np.int32, str)
+        assert not np.issubdtype(np.int32, 'int64')
+        assert not np.issubdtype(np.str_, 'void')
+        # for the following the correct spellings are
+        # np.integer, np.floating, or np.complexfloating respectively:
+        assert not np.issubdtype(np.int8, int)  # np.int8 is never np.int_
+        assert not np.issubdtype(np.float32, float)
+        assert not np.issubdtype(np.complex64, complex)
+        assert not np.issubdtype(np.float32, "float")
+        assert not np.issubdtype(np.float64, "f")
+
+        # Test the same for the correct first datatype and abstract one
+        # in the case of int, float, complex:
+        assert np.issubdtype(np.float64, 'float64')
+        assert np.issubdtype(np.float64, 'f8')
+        assert np.issubdtype(np.str_, str)
+        assert np.issubdtype(np.int64, 'int64')
+        assert np.issubdtype(np.void, 'void')
+        assert np.issubdtype(np.int8, np.integer)
+        assert np.issubdtype(np.float32, np.floating)
+        assert np.issubdtype(np.complex64, np.complexfloating)
+        assert np.issubdtype(np.float64, "float")
+        assert np.issubdtype(np.float32, "f")
+
+
+class TestIsDType:
+    """
+    Check correctness of `np.isdtype`. The test considers different argument
+    configurations: `np.isdtype(dtype, k1)` and `np.isdtype(dtype, (k1, k2))`
+    with concrete dtypes and dtype groups.
+    """
+    dtype_group_dict = {
+        "signed integer": sctypes["int"],
+        "unsigned integer": sctypes["uint"],
+        "integral": sctypes["int"] + sctypes["uint"],
+        "real floating": sctypes["float"],
+        "complex floating": sctypes["complex"],
+        "numeric": (
+            sctypes["int"] + sctypes["uint"] + sctypes["float"] +
+            sctypes["complex"]
+        )
+    }
+
+    @pytest.mark.parametrize(
+        "dtype,close_dtype",
+        [
+            (np.int64, np.int32), (np.uint64, np.uint32),
+            (np.float64, np.float32), (np.complex128, np.complex64)
+        ]
+    )
+    @pytest.mark.parametrize(
+        "dtype_group",
+        [
+            None, "signed integer", "unsigned integer", "integral",
+            "real floating", "complex floating", "numeric"
+        ]
+    )
+    def test_isdtype(self, dtype, close_dtype, dtype_group):
+        # First check if same dtypes return `true` and different ones
+        # give `false` (even if they're close in the dtype hierarchy!)
+        if dtype_group is None:
+            assert np.isdtype(dtype, dtype)
+            assert not np.isdtype(dtype, close_dtype)
+            assert np.isdtype(dtype, (dtype, close_dtype))
+
+        # Check that dtype and a dtype group that it belongs to
+        # return `true`, and `false` otherwise.
+        elif dtype in self.dtype_group_dict[dtype_group]:
+            assert np.isdtype(dtype, dtype_group)
+            assert np.isdtype(dtype, (close_dtype, dtype_group))
+        else:
+            assert not np.isdtype(dtype, dtype_group)
+
+    def test_isdtype_invalid_args(self):
+        with assert_raises_regex(TypeError, r".*must be a NumPy dtype.*"):
+            np.isdtype("int64", np.int64)
+        with assert_raises_regex(TypeError, r".*kind argument must.*"):
+            np.isdtype(np.int64, 1)
+        with assert_raises_regex(ValueError, r".*not a known kind name.*"):
+            np.isdtype(np.int64, "int64")
+
+    def test_sctypes_complete(self):
+        # issue 26439: int32/intc were masking each other on 32-bit builds
+        assert np.int32 in sctypes['int']
+        assert np.intc in sctypes['int']
+        assert np.int64 in sctypes['int']
+        assert np.uint32 in sctypes['uint']
+        assert np.uintc in sctypes['uint']
+        assert np.uint64 in sctypes['uint']
+
+class TestSctypeDict:
+    def test_longdouble(self):
+        assert_(np._core.sctypeDict['float64'] is not np.longdouble)
+        assert_(np._core.sctypeDict['complex128'] is not np.clongdouble)
+
+    def test_ulong(self):
+        assert np._core.sctypeDict['ulong'] is np.ulong
+        assert np.dtype(np.ulong) is np.dtype("ulong")
+        assert np.dtype(np.ulong).itemsize == np.dtype(np.long).itemsize
+
+
+@pytest.mark.filterwarnings("ignore:.*maximum_sctype.*:DeprecationWarning")
+class TestMaximumSctype:
+
+    # note that parametrizing with sctype['int'] and similar would skip types
+    # with the same size (gh-11923)
+
+    @pytest.mark.parametrize(
+        't', [np.byte, np.short, np.intc, np.long, np.longlong]
+    )
+    def test_int(self, t):
+        assert_equal(maximum_sctype(t), np._core.sctypes['int'][-1])
+
+    @pytest.mark.parametrize(
+        't', [np.ubyte, np.ushort, np.uintc, np.ulong, np.ulonglong]
+    )
+    def test_uint(self, t):
+        assert_equal(maximum_sctype(t), np._core.sctypes['uint'][-1])
+
+    @pytest.mark.parametrize('t', [np.half, np.single, np.double, np.longdouble])
+    def test_float(self, t):
+        assert_equal(maximum_sctype(t), np._core.sctypes['float'][-1])
+
+    @pytest.mark.parametrize('t', [np.csingle, np.cdouble, np.clongdouble])
+    def test_complex(self, t):
+        assert_equal(maximum_sctype(t), np._core.sctypes['complex'][-1])
+
+    @pytest.mark.parametrize('t', [np.bool, np.object_, np.str_, np.bytes_,
+                                   np.void])
+    def test_other(self, t):
+        assert_equal(maximum_sctype(t), t)
+
+
+class Test_sctype2char:
+    # This function is old enough that we're really just documenting the quirks
+    # at this point.
+
+    def test_scalar_type(self):
+        assert_equal(sctype2char(np.double), 'd')
+        assert_equal(sctype2char(np.long), 'l')
+        assert_equal(sctype2char(np.int_), np.array(0).dtype.char)
+        assert_equal(sctype2char(np.str_), 'U')
+        assert_equal(sctype2char(np.bytes_), 'S')
+
+    def test_other_type(self):
+        assert_equal(sctype2char(float), 'd')
+        assert_equal(sctype2char(list), 'O')
+        assert_equal(sctype2char(np.ndarray), 'O')
+
+    def test_third_party_scalar_type(self):
+        from numpy._core._rational_tests import rational
+        assert_raises(KeyError, sctype2char, rational)
+        assert_raises(KeyError, sctype2char, rational(1))
+
+    def test_array_instance(self):
+        assert_equal(sctype2char(np.array([1.0, 2.0])), 'd')
+
+    def test_abstract_type(self):
+        assert_raises(KeyError, sctype2char, np.floating)
+
+    def test_non_type(self):
+        assert_raises(ValueError, sctype2char, 1)
+
+@pytest.mark.parametrize("rep, expected", [
+    (np.int32, True),
+    (list, False),
+    (1.1, False),
+    (str, True),
+    (np.dtype(np.float64), True),
+    (np.dtype((np.int16, (3, 4))), True),
+    (np.dtype([('a', np.int8)]), True),
+    ])
+def test_issctype(rep, expected):
+    # ensure proper identification of scalar
+    # data-types by issctype()
+    actual = issctype(rep)
+    assert type(actual) is bool
+    assert_equal(actual, expected)
+
+
+@pytest.mark.skipif(sys.flags.optimize > 1,
+                    reason="no docstrings present to inspect when PYTHONOPTIMIZE/Py_OptimizeFlag > 1")
+@pytest.mark.xfail(IS_PYPY,
+                   reason="PyPy cannot modify tp_doc after PyType_Ready")
+class TestDocStrings:
+    def test_platform_dependent_aliases(self):
+        if np.int64 is np.int_:
+            assert_('int64' in np.int_.__doc__)
+        elif np.int64 is np.longlong:
+            assert_('int64' in np.longlong.__doc__)
+
+
+class TestScalarTypeNames:
+    # gh-9799
+
+    numeric_types = [
+        np.byte, np.short, np.intc, np.long, np.longlong,
+        np.ubyte, np.ushort, np.uintc, np.ulong, np.ulonglong,
+        np.half, np.single, np.double, np.longdouble,
+        np.csingle, np.cdouble, np.clongdouble,
+    ]
+
+    def test_names_are_unique(self):
+        # none of the above may be aliases for each other
+        assert len(set(self.numeric_types)) == len(self.numeric_types)
+
+        # names must be unique
+        names = [t.__name__ for t in self.numeric_types]
+        assert len(set(names)) == len(names)
+
+    @pytest.mark.parametrize('t', numeric_types)
+    def test_names_reflect_attributes(self, t):
+        """ Test that names correspond to where the type is under ``np.`` """
+        assert getattr(np, t.__name__) is t
+
+    @pytest.mark.parametrize('t', numeric_types)
+    def test_names_are_undersood_by_dtype(self, t):
+        """ Test the dtype constructor maps names back to the type """
+        assert np.dtype(t.__name__).type is t
+
+
+class TestBoolDefinition:
+    def test_bool_definition(self):
+        assert nt.bool is np.bool

mantis_evalkit/lib/python3.10/site-packages/numpy/_core/tests/test_overrides.py

@@ -0,0 +1,797 @@
+import inspect
+import sys
+import os
+import tempfile
+from io import StringIO
+from unittest import mock
+import pickle
+
+import pytest
+
+import numpy as np
+from numpy.testing import (
+    assert_, assert_equal, assert_raises, assert_raises_regex)
+from numpy.testing.overrides import get_overridable_numpy_array_functions
+from numpy._core.overrides import (
+    _get_implementing_args, array_function_dispatch,
+    verify_matching_signatures)
+
+def _return_not_implemented(self, *args, **kwargs):
+    return NotImplemented
+
+
+# need to define this at the top level to test pickling
+@array_function_dispatch(lambda array: (array,))
+def dispatched_one_arg(array):
+    """Docstring."""
+    return 'original'
+
+
+@array_function_dispatch(lambda array1, array2: (array1, array2))
+def dispatched_two_arg(array1, array2):
+    """Docstring."""
+    return 'original'
+
+
+class TestGetImplementingArgs:
+
+    def test_ndarray(self):
+        array = np.array(1)
+
+        args = _get_implementing_args([array])
+        assert_equal(list(args), [array])
+
+        args = _get_implementing_args([array, array])
+        assert_equal(list(args), [array])
+
+        args = _get_implementing_args([array, 1])
+        assert_equal(list(args), [array])
+
+        args = _get_implementing_args([1, array])
+        assert_equal(list(args), [array])
+
+    def test_ndarray_subclasses(self):
+
+        class OverrideSub(np.ndarray):
+            __array_function__ = _return_not_implemented
+
+        class NoOverrideSub(np.ndarray):
+            pass
+
+        array = np.array(1).view(np.ndarray)
+        override_sub = np.array(1).view(OverrideSub)
+        no_override_sub = np.array(1).view(NoOverrideSub)
+
+        args = _get_implementing_args([array, override_sub])
+        assert_equal(list(args), [override_sub, array])
+
+        args = _get_implementing_args([array, no_override_sub])
+        assert_equal(list(args), [no_override_sub, array])
+
+        args = _get_implementing_args(
+            [override_sub, no_override_sub])
+        assert_equal(list(args), [override_sub, no_override_sub])
+
+    def test_ndarray_and_duck_array(self):
+
+        class Other:
+            __array_function__ = _return_not_implemented
+
+        array = np.array(1)
+        other = Other()
+
+        args = _get_implementing_args([other, array])
+        assert_equal(list(args), [other, array])
+
+        args = _get_implementing_args([array, other])
+        assert_equal(list(args), [array, other])
+
+    def test_ndarray_subclass_and_duck_array(self):
+
+        class OverrideSub(np.ndarray):
+            __array_function__ = _return_not_implemented
+
+        class Other:
+            __array_function__ = _return_not_implemented
+
+        array = np.array(1)
+        subarray = np.array(1).view(OverrideSub)
+        other = Other()
+
+        assert_equal(_get_implementing_args([array, subarray, other]),
+                     [subarray, array, other])
+        assert_equal(_get_implementing_args([array, other, subarray]),
+                     [subarray, array, other])
+
+    def test_many_duck_arrays(self):
+
+        class A:
+            __array_function__ = _return_not_implemented
+
+        class B(A):
+            __array_function__ = _return_not_implemented
+
+        class C(A):
+            __array_function__ = _return_not_implemented
+
+        class D:
+            __array_function__ = _return_not_implemented
+
+        a = A()
+        b = B()
+        c = C()
+        d = D()
+
+        assert_equal(_get_implementing_args([1]), [])
+        assert_equal(_get_implementing_args([a]), [a])
+        assert_equal(_get_implementing_args([a, 1]), [a])
+        assert_equal(_get_implementing_args([a, a, a]), [a])
+        assert_equal(_get_implementing_args([a, d, a]), [a, d])
+        assert_equal(_get_implementing_args([a, b]), [b, a])
+        assert_equal(_get_implementing_args([b, a]), [b, a])
+        assert_equal(_get_implementing_args([a, b, c]), [b, c, a])
+        assert_equal(_get_implementing_args([a, c, b]), [c, b, a])
+
+    def test_too_many_duck_arrays(self):
+        namespace = dict(__array_function__=_return_not_implemented)
+        types = [type('A' + str(i), (object,), namespace) for i in range(65)]
+        relevant_args = [t() for t in types]
+
+        actual = _get_implementing_args(relevant_args[:64])
+        assert_equal(actual, relevant_args[:64])
+
+        with assert_raises_regex(TypeError, 'distinct argument types'):
+            _get_implementing_args(relevant_args)
+
+
+class TestNDArrayArrayFunction:
+
+    def test_method(self):
+
+        class Other:
+            __array_function__ = _return_not_implemented
+
+        class NoOverrideSub(np.ndarray):
+            pass
+
+        class OverrideSub(np.ndarray):
+            __array_function__ = _return_not_implemented
+
+        array = np.array([1])
+        other = Other()
+        no_override_sub = array.view(NoOverrideSub)
+        override_sub = array.view(OverrideSub)
+
+        result = array.__array_function__(func=dispatched_two_arg,
+                                          types=(np.ndarray,),
+                                          args=(array, 1.), kwargs={})
+        assert_equal(result, 'original')
+
+        result = array.__array_function__(func=dispatched_two_arg,
+                                          types=(np.ndarray, Other),
+                                          args=(array, other), kwargs={})
+        assert_(result is NotImplemented)
+
+        result = array.__array_function__(func=dispatched_two_arg,
+                                          types=(np.ndarray, NoOverrideSub),
+                                          args=(array, no_override_sub),
+                                          kwargs={})
+        assert_equal(result, 'original')
+
+        result = array.__array_function__(func=dispatched_two_arg,
+                                          types=(np.ndarray, OverrideSub),
+                                          args=(array, override_sub),
+                                          kwargs={})
+        assert_equal(result, 'original')
+
+        with assert_raises_regex(TypeError, 'no implementation found'):
+            np.concatenate((array, other))
+
+        expected = np.concatenate((array, array))
+        result = np.concatenate((array, no_override_sub))
+        assert_equal(result, expected.view(NoOverrideSub))
+        result = np.concatenate((array, override_sub))
+        assert_equal(result, expected.view(OverrideSub))
+
+    def test_no_wrapper(self):
+        # Regular numpy functions have wrappers, but do not presume
+        # all functions do (array creation ones do not): check that
+        # we just call the function in that case.
+        array = np.array(1)
+        func = lambda x: x * 2
+        result = array.__array_function__(func=func, types=(np.ndarray,),
+                                          args=(array,), kwargs={})
+        assert_equal(result, array * 2)
+
+    def test_wrong_arguments(self):
+        # Check our implementation guards against wrong arguments.
+        a = np.array([1, 2])
+        with pytest.raises(TypeError, match="args must be a tuple"):
+            a.__array_function__(np.reshape, (np.ndarray,), a, (2, 1))
+        with pytest.raises(TypeError, match="kwargs must be a dict"):
+            a.__array_function__(np.reshape, (np.ndarray,), (a,), (2, 1))
+
+    def test_wrong_arguments(self):
+        # Check our implementation guards against wrong arguments.
+        a = np.array([1, 2])
+        with pytest.raises(TypeError, match="args must be a tuple"):
+            a.__array_function__(np.reshape, (np.ndarray,), a, (2, 1))
+        with pytest.raises(TypeError, match="kwargs must be a dict"):
+            a.__array_function__(np.reshape, (np.ndarray,), (a,), (2, 1))
+
+
+class TestArrayFunctionDispatch:
+
+    def test_pickle(self):
+        for proto in range(2, pickle.HIGHEST_PROTOCOL + 1):
+            roundtripped = pickle.loads(
+                    pickle.dumps(dispatched_one_arg, protocol=proto))
+            assert_(roundtripped is dispatched_one_arg)
+
+    def test_name_and_docstring(self):
+        assert_equal(dispatched_one_arg.__name__, 'dispatched_one_arg')
+        if sys.flags.optimize < 2:
+            assert_equal(dispatched_one_arg.__doc__, 'Docstring.')
+
+    def test_interface(self):
+
+        class MyArray:
+            def __array_function__(self, func, types, args, kwargs):
+                return (self, func, types, args, kwargs)
+
+        original = MyArray()
+        (obj, func, types, args, kwargs) = dispatched_one_arg(original)
+        assert_(obj is original)
+        assert_(func is dispatched_one_arg)
+        assert_equal(set(types), {MyArray})
+        # assert_equal uses the overloaded np.iscomplexobj() internally
+        assert_(args == (original,))
+        assert_equal(kwargs, {})
+
+    def test_not_implemented(self):
+
+        class MyArray:
+            def __array_function__(self, func, types, args, kwargs):
+                return NotImplemented
+
+        array = MyArray()
+        with assert_raises_regex(TypeError, 'no implementation found'):
+            dispatched_one_arg(array)
+
+    def test_where_dispatch(self):
+
+        class DuckArray:
+            def __array_function__(self, ufunc, method, *inputs, **kwargs):
+                return "overridden"
+
+        array = np.array(1)
+        duck_array = DuckArray()
+
+        result = np.std(array, where=duck_array)
+
+        assert_equal(result, "overridden")
+
+
+class TestVerifyMatchingSignatures:
+
+    def test_verify_matching_signatures(self):
+
+        verify_matching_signatures(lambda x: 0, lambda x: 0)
+        verify_matching_signatures(lambda x=None: 0, lambda x=None: 0)
+        verify_matching_signatures(lambda x=1: 0, lambda x=None: 0)
+
+        with assert_raises(RuntimeError):
+            verify_matching_signatures(lambda a: 0, lambda b: 0)
+        with assert_raises(RuntimeError):
+            verify_matching_signatures(lambda x: 0, lambda x=None: 0)
+        with assert_raises(RuntimeError):
+            verify_matching_signatures(lambda x=None: 0, lambda y=None: 0)
+        with assert_raises(RuntimeError):
+            verify_matching_signatures(lambda x=1: 0, lambda y=1: 0)
+
+    def test_array_function_dispatch(self):
+
+        with assert_raises(RuntimeError):
+            @array_function_dispatch(lambda x: (x,))
+            def f(y):
+                pass
+
+        # should not raise
+        @array_function_dispatch(lambda x: (x,), verify=False)
+        def f(y):
+            pass
+
+
+def _new_duck_type_and_implements():
+    """Create a duck array type and implements functions."""
+    HANDLED_FUNCTIONS = {}
+
+    class MyArray:
+        def __array_function__(self, func, types, args, kwargs):
+            if func not in HANDLED_FUNCTIONS:
+                return NotImplemented
+            if not all(issubclass(t, MyArray) for t in types):
+                return NotImplemented
+            return HANDLED_FUNCTIONS[func](*args, **kwargs)
+
+    def implements(numpy_function):
+        """Register an __array_function__ implementations."""
+        def decorator(func):
+            HANDLED_FUNCTIONS[numpy_function] = func
+            return func
+        return decorator
+
+    return (MyArray, implements)
+
+
+class TestArrayFunctionImplementation:
+
+    def test_one_arg(self):
+        MyArray, implements = _new_duck_type_and_implements()
+
+        @implements(dispatched_one_arg)
+        def _(array):
+            return 'myarray'
+
+        assert_equal(dispatched_one_arg(1), 'original')
+        assert_equal(dispatched_one_arg(MyArray()), 'myarray')
+
+    def test_optional_args(self):
+        MyArray, implements = _new_duck_type_and_implements()
+
+        @array_function_dispatch(lambda array, option=None: (array,))
+        def func_with_option(array, option='default'):
+            return option
+
+        @implements(func_with_option)
+        def my_array_func_with_option(array, new_option='myarray'):
+            return new_option
+
+        # we don't need to implement every option on __array_function__
+        # implementations
+        assert_equal(func_with_option(1), 'default')
+        assert_equal(func_with_option(1, option='extra'), 'extra')
+        assert_equal(func_with_option(MyArray()), 'myarray')
+        with assert_raises(TypeError):
+            func_with_option(MyArray(), option='extra')
+
+        # but new options on implementations can't be used
+        result = my_array_func_with_option(MyArray(), new_option='yes')
+        assert_equal(result, 'yes')
+        with assert_raises(TypeError):
+            func_with_option(MyArray(), new_option='no')
+
+    def test_not_implemented(self):
+        MyArray, implements = _new_duck_type_and_implements()
+
+        @array_function_dispatch(lambda array: (array,), module='my')
+        def func(array):
+            return array
+
+        array = np.array(1)
+        assert_(func(array) is array)
+        assert_equal(func.__module__, 'my')
+
+        with assert_raises_regex(
+                TypeError, "no implementation found for 'my.func'"):
+            func(MyArray())
+
+    @pytest.mark.parametrize("name", ["concatenate", "mean", "asarray"])
+    def test_signature_error_message_simple(self, name):
+        func = getattr(np, name)
+        try:
+            # all of these functions need an argument:
+            func()
+        except TypeError as e:
+            exc = e
+
+        assert exc.args[0].startswith(f"{name}()")
+
+    def test_signature_error_message(self):
+        # The lambda function will be named "<lambda>", but the TypeError
+        # should show the name as "func"
+        def _dispatcher():
+            return ()
+
+        @array_function_dispatch(_dispatcher)
+        def func():
+            pass
+
+        try:
+            func._implementation(bad_arg=3)
+        except TypeError as e:
+            expected_exception = e
+
+        try:
+            func(bad_arg=3)
+            raise AssertionError("must fail")
+        except TypeError as exc:
+            if exc.args[0].startswith("_dispatcher"):
+                # We replace the qualname currently, but it used `__name__`
+                # (relevant functions have the same name and qualname anyway)
+                pytest.skip("Python version is not using __qualname__ for "
+                            "TypeError formatting.")
+
+            assert exc.args == expected_exception.args
+
+    @pytest.mark.parametrize("value", [234, "this func is not replaced"])
+    def test_dispatcher_error(self, value):
+        # If the dispatcher raises an error, we must not attempt to mutate it
+        error = TypeError(value)
+
+        def dispatcher():
+            raise error
+
+        @array_function_dispatch(dispatcher)
+        def func():
+            return 3
+
+        try:
+            func()
+            raise AssertionError("must fail")
+        except TypeError as exc:
+            assert exc is error  # unmodified exception
+
+    def test_properties(self):
+        # Check that str and repr are sensible
+        func = dispatched_two_arg
+        assert str(func) == str(func._implementation)
+        repr_no_id = repr(func).split("at ")[0]
+        repr_no_id_impl = repr(func._implementation).split("at ")[0]
+        assert repr_no_id == repr_no_id_impl
+
+    @pytest.mark.parametrize("func", [
+            lambda x, y: 0,  # no like argument
+            lambda like=None: 0,  # not keyword only
+            lambda *, like=None, a=3: 0,  # not last (not that it matters)
+        ])
+    def test_bad_like_sig(self, func):
+        # We sanity check the signature, and these should fail.
+        with pytest.raises(RuntimeError):
+            array_function_dispatch()(func)
+
+    def test_bad_like_passing(self):
+        # Cover internal sanity check for passing like as first positional arg
+        def func(*, like=None):
+            pass
+
+        func_with_like = array_function_dispatch()(func)
+        with pytest.raises(TypeError):
+            func_with_like()
+        with pytest.raises(TypeError):
+            func_with_like(like=234)
+
+    def test_too_many_args(self):
+        # Mainly a unit-test to increase coverage
+        objs = []
+        for i in range(80):
+            class MyArr:
+                def __array_function__(self, *args, **kwargs):
+                    return NotImplemented
+
+            objs.append(MyArr())
+
+        def _dispatch(*args):
+            return args
+
+        @array_function_dispatch(_dispatch)
+        def func(*args):
+            pass
+
+        with pytest.raises(TypeError, match="maximum number"):
+            func(*objs)
+
+
+
+class TestNDArrayMethods:
+
+    def test_repr(self):
+        # gh-12162: should still be defined even if __array_function__ doesn't
+        # implement np.array_repr()
+
+        class MyArray(np.ndarray):
+            def __array_function__(*args, **kwargs):
+                return NotImplemented
+
+        array = np.array(1).view(MyArray)
+        assert_equal(repr(array), 'MyArray(1)')
+        assert_equal(str(array), '1')
+
+
+class TestNumPyFunctions:
+
+    def test_set_module(self):
+        assert_equal(np.sum.__module__, 'numpy')
+        assert_equal(np.char.equal.__module__, 'numpy.char')
+        assert_equal(np.fft.fft.__module__, 'numpy.fft')
+        assert_equal(np.linalg.solve.__module__, 'numpy.linalg')
+
+    def test_inspect_sum(self):
+        signature = inspect.signature(np.sum)
+        assert_('axis' in signature.parameters)
+
+    def test_override_sum(self):
+        MyArray, implements = _new_duck_type_and_implements()
+
+        @implements(np.sum)
+        def _(array):
+            return 'yes'
+
+        assert_equal(np.sum(MyArray()), 'yes')
+
+    def test_sum_on_mock_array(self):
+
+        # We need a proxy for mocks because __array_function__ is only looked
+        # up in the class dict
+        class ArrayProxy:
+            def __init__(self, value):
+                self.value = value
+            def __array_function__(self, *args, **kwargs):
+                return self.value.__array_function__(*args, **kwargs)
+            def __array__(self, *args, **kwargs):
+                return self.value.__array__(*args, **kwargs)
+
+        proxy = ArrayProxy(mock.Mock(spec=ArrayProxy))
+        proxy.value.__array_function__.return_value = 1
+        result = np.sum(proxy)
+        assert_equal(result, 1)
+        proxy.value.__array_function__.assert_called_once_with(
+            np.sum, (ArrayProxy,), (proxy,), {})
+        proxy.value.__array__.assert_not_called()
+
+    def test_sum_forwarding_implementation(self):
+
+        class MyArray(np.ndarray):
+
+            def sum(self, axis, out):
+                return 'summed'
+
+            def __array_function__(self, func, types, args, kwargs):
+                return super().__array_function__(func, types, args, kwargs)
+
+        # note: the internal implementation of np.sum() calls the .sum() method
+        array = np.array(1).view(MyArray)
+        assert_equal(np.sum(array), 'summed')
+
+
+class TestArrayLike:
+    def setup_method(self):
+        class MyArray:
+            def __init__(self, function=None):
+                self.function = function
+
+            def __array_function__(self, func, types, args, kwargs):
+                assert func is getattr(np, func.__name__)
+                try:
+                    my_func = getattr(self, func.__name__)
+                except AttributeError:
+                    return NotImplemented
+                return my_func(*args, **kwargs)
+
+        self.MyArray = MyArray
+
+        class MyNoArrayFunctionArray:
+            def __init__(self, function=None):
+                self.function = function
+
+        self.MyNoArrayFunctionArray = MyNoArrayFunctionArray
+
+        class MySubclass(np.ndarray):
+            def __array_function__(self, func, types, args, kwargs):
+                result = super().__array_function__(func, types, args, kwargs)
+                return result.view(self.__class__)
+
+        self.MySubclass = MySubclass
+
+    def add_method(self, name, arr_class, enable_value_error=False):
+        def _definition(*args, **kwargs):
+            # Check that `like=` isn't propagated downstream
+            assert 'like' not in kwargs
+
+            if enable_value_error and 'value_error' in kwargs:
+                raise ValueError
+
+            return arr_class(getattr(arr_class, name))
+        setattr(arr_class, name, _definition)
+
+    def func_args(*args, **kwargs):
+        return args, kwargs
+
+    def test_array_like_not_implemented(self):
+        self.add_method('array', self.MyArray)
+
+        ref = self.MyArray.array()
+
+        with assert_raises_regex(TypeError, 'no implementation found'):
+            array_like = np.asarray(1, like=ref)
+
+    _array_tests = [
+        ('array', *func_args((1,))),
+        ('asarray', *func_args((1,))),
+        ('asanyarray', *func_args((1,))),
+        ('ascontiguousarray', *func_args((2, 3))),
+        ('asfortranarray', *func_args((2, 3))),
+        ('require', *func_args((np.arange(6).reshape(2, 3),),
+                               requirements=['A', 'F'])),
+        ('empty', *func_args((1,))),
+        ('full', *func_args((1,), 2)),
+        ('ones', *func_args((1,))),
+        ('zeros', *func_args((1,))),
+        ('arange', *func_args(3)),
+        ('frombuffer', *func_args(b'\x00' * 8, dtype=int)),
+        ('fromiter', *func_args(range(3), dtype=int)),
+        ('fromstring', *func_args('1,2', dtype=int, sep=',')),
+        ('loadtxt', *func_args(lambda: StringIO('0 1\n2 3'))),
+        ('genfromtxt', *func_args(lambda: StringIO('1,2.1'),
+                                  dtype=[('int', 'i8'), ('float', 'f8')],
+                                  delimiter=',')),
+    ]
+
+
+    def test_nep35_functions_as_array_functions(self,):
+        all_array_functions = get_overridable_numpy_array_functions()
+        like_array_functions_subset = {
+            getattr(np, func_name) for func_name, *_ in self.__class__._array_tests
+        }
+        assert like_array_functions_subset.issubset(all_array_functions)
+
+        nep35_python_functions = {
+            np.eye, np.fromfunction, np.full, np.genfromtxt,
+            np.identity, np.loadtxt, np.ones, np.require, np.tri,
+        }
+        assert nep35_python_functions.issubset(all_array_functions)
+
+        nep35_C_functions = {
+            np.arange, np.array, np.asanyarray, np.asarray,
+            np.ascontiguousarray, np.asfortranarray, np.empty,
+            np.frombuffer, np.fromfile, np.fromiter, np.fromstring,
+            np.zeros,
+        }
+        assert nep35_C_functions.issubset(all_array_functions)
+
+    @pytest.mark.parametrize('function, args, kwargs', _array_tests)
+    @pytest.mark.parametrize('numpy_ref', [True, False])
+    def test_array_like(self, function, args, kwargs, numpy_ref):
+        self.add_method('array', self.MyArray)
+        self.add_method(function, self.MyArray)
+        np_func = getattr(np, function)
+        my_func = getattr(self.MyArray, function)
+
+        if numpy_ref is True:
+            ref = np.array(1)
+        else:
+            ref = self.MyArray.array()
+
+        like_args = tuple(a() if callable(a) else a for a in args)
+        array_like = np_func(*like_args, **kwargs, like=ref)
+
+        if numpy_ref is True:
+            assert type(array_like) is np.ndarray
+
+            np_args = tuple(a() if callable(a) else a for a in args)
+            np_arr = np_func(*np_args, **kwargs)
+
+            # Special-case np.empty to ensure values match
+            if function == "empty":
+                np_arr.fill(1)
+                array_like.fill(1)
+
+            assert_equal(array_like, np_arr)
+        else:
+            assert type(array_like) is self.MyArray
+            assert array_like.function is my_func
+
+    @pytest.mark.parametrize('function, args, kwargs', _array_tests)
+    @pytest.mark.parametrize('ref', [1, [1], "MyNoArrayFunctionArray"])
+    def test_no_array_function_like(self, function, args, kwargs, ref):
+        self.add_method('array', self.MyNoArrayFunctionArray)
+        self.add_method(function, self.MyNoArrayFunctionArray)
+        np_func = getattr(np, function)
+
+        # Instantiate ref if it's the MyNoArrayFunctionArray class
+        if ref == "MyNoArrayFunctionArray":
+            ref = self.MyNoArrayFunctionArray.array()
+
+        like_args = tuple(a() if callable(a) else a for a in args)
+
+        with assert_raises_regex(TypeError,
+                'The `like` argument must be an array-like that implements'):
+            np_func(*like_args, **kwargs, like=ref)
+
+    @pytest.mark.parametrize('function, args, kwargs', _array_tests)
+    def test_subclass(self, function, args, kwargs):
+        ref = np.array(1).view(self.MySubclass)
+        np_func = getattr(np, function)
+        like_args = tuple(a() if callable(a) else a for a in args)
+        array_like = np_func(*like_args, **kwargs, like=ref)
+        assert type(array_like) is self.MySubclass
+        if np_func is np.empty:
+            return
+        np_args = tuple(a() if callable(a) else a for a in args)
+        np_arr = np_func(*np_args, **kwargs)
+        assert_equal(array_like.view(np.ndarray), np_arr)
+
+    @pytest.mark.parametrize('numpy_ref', [True, False])
+    def test_array_like_fromfile(self, numpy_ref):
+        self.add_method('array', self.MyArray)
+        self.add_method("fromfile", self.MyArray)
+
+        if numpy_ref is True:
+            ref = np.array(1)
+        else:
+            ref = self.MyArray.array()
+
+        data = np.random.random(5)
+
+        with tempfile.TemporaryDirectory() as tmpdir:
+            fname = os.path.join(tmpdir, "testfile")
+            data.tofile(fname)
+
+            array_like = np.fromfile(fname, like=ref)
+            if numpy_ref is True:
+                assert type(array_like) is np.ndarray
+                np_res = np.fromfile(fname, like=ref)
+                assert_equal(np_res, data)
+                assert_equal(array_like, np_res)
+            else:
+                assert type(array_like) is self.MyArray
+                assert array_like.function is self.MyArray.fromfile
+
+    def test_exception_handling(self):
+        self.add_method('array', self.MyArray, enable_value_error=True)
+
+        ref = self.MyArray.array()
+
+        with assert_raises(TypeError):
+            # Raises the error about `value_error` being invalid first
+            np.array(1, value_error=True, like=ref)
+
+    @pytest.mark.parametrize('function, args, kwargs', _array_tests)
+    def test_like_as_none(self, function, args, kwargs):
+        self.add_method('array', self.MyArray)
+        self.add_method(function, self.MyArray)
+        np_func = getattr(np, function)
+
+        like_args = tuple(a() if callable(a) else a for a in args)
+        # required for loadtxt and genfromtxt to init w/o error.
+        like_args_exp = tuple(a() if callable(a) else a for a in args)
+
+        array_like = np_func(*like_args, **kwargs, like=None)
+        expected = np_func(*like_args_exp, **kwargs)
+        # Special-case np.empty to ensure values match
+        if function == "empty":
+            array_like.fill(1)
+            expected.fill(1)
+        assert_equal(array_like, expected)
+
+
+def test_function_like():
+    # We provide a `__get__` implementation, make sure it works
+    assert type(np.mean) is np._core._multiarray_umath._ArrayFunctionDispatcher
+
+    class MyClass:
+        def __array__(self, dtype=None, copy=None):
+            # valid argument to mean:
+            return np.arange(3)
+
+        func1 = staticmethod(np.mean)
+        func2 = np.mean
+        func3 = classmethod(np.mean)
+
+    m = MyClass()
+    assert m.func1([10]) == 10
+    assert m.func2() == 1  # mean of the arange
+    with pytest.raises(TypeError, match="unsupported operand type"):
+        # Tries to operate on the class
+        m.func3()
+
+    # Manual binding also works (the above may shortcut):
+    bound = np.mean.__get__(m, MyClass)
+    assert bound() == 1
+
+    bound = np.mean.__get__(None, MyClass)  # unbound actually
+    assert bound([10]) == 10
+
+    bound = np.mean.__get__(MyClass)  # classmethod
+    with pytest.raises(TypeError, match="unsupported operand type"):
+        bound()

mantis_evalkit/lib/python3.10/site-packages/numpy/_core/tests/test_records.py

@@ -0,0 +1,540 @@
+import collections.abc
+import textwrap
+from io import BytesIO
+from os import path
+from pathlib import Path
+import pickle
+
+import pytest
+
+import numpy as np
+from numpy.testing import (
+    assert_, assert_equal, assert_array_equal, assert_array_almost_equal,
+    assert_raises, temppath,
+    )
+
+
+class TestFromrecords:
+    def test_fromrecords(self):
+        r = np.rec.fromrecords([[456, 'dbe', 1.2], [2, 'de', 1.3]],
+                            names='col1,col2,col3')
+        assert_equal(r[0].item(), (456, 'dbe', 1.2))
+        assert_equal(r['col1'].dtype.kind, 'i')
+        assert_equal(r['col2'].dtype.kind, 'U')
+        assert_equal(r['col2'].dtype.itemsize, 12)
+        assert_equal(r['col3'].dtype.kind, 'f')
+
+    def test_fromrecords_0len(self):
+        """ Verify fromrecords works with a 0-length input """
+        dtype = [('a', float), ('b', float)]
+        r = np.rec.fromrecords([], dtype=dtype)
+        assert_equal(r.shape, (0,))
+
+    def test_fromrecords_2d(self):
+        data = [
+            [(1, 2), (3, 4), (5, 6)],
+            [(6, 5), (4, 3), (2, 1)]
+        ]
+        expected_a = [[1, 3, 5], [6, 4, 2]]
+        expected_b = [[2, 4, 6], [5, 3, 1]]
+
+        # try with dtype
+        r1 = np.rec.fromrecords(data, dtype=[('a', int), ('b', int)])
+        assert_equal(r1['a'], expected_a)
+        assert_equal(r1['b'], expected_b)
+
+        # try with names
+        r2 = np.rec.fromrecords(data, names=['a', 'b'])
+        assert_equal(r2['a'], expected_a)
+        assert_equal(r2['b'], expected_b)
+
+        assert_equal(r1, r2)
+
+    def test_method_array(self):
+        r = np.rec.array(
+            b'abcdefg' * 100, formats='i2,S3,i4', shape=3, byteorder='big'
+        )
+        assert_equal(r[1].item(), (25444, b'efg', 1633837924))
+
+    def test_method_array2(self):
+        r = np.rec.array(
+            [
+                (1, 11, 'a'), (2, 22, 'b'), (3, 33, 'c'), (4, 44, 'd'),
+                (5, 55, 'ex'), (6, 66, 'f'), (7, 77, 'g')
+            ],
+            formats='u1,f4,S1'
+        )
+        assert_equal(r[1].item(), (2, 22.0, b'b'))
+
+    def test_recarray_slices(self):
+        r = np.rec.array(
+            [
+                (1, 11, 'a'), (2, 22, 'b'), (3, 33, 'c'), (4, 44, 'd'),
+                (5, 55, 'ex'), (6, 66, 'f'), (7, 77, 'g')
+            ],
+            formats='u1,f4,S1'
+        )
+        assert_equal(r[1::2][1].item(), (4, 44.0, b'd'))
+
+    def test_recarray_fromarrays(self):
+        x1 = np.array([1, 2, 3, 4])
+        x2 = np.array(['a', 'dd', 'xyz', '12'])
+        x3 = np.array([1.1, 2, 3, 4])
+        r = np.rec.fromarrays([x1, x2, x3], names='a,b,c')
+        assert_equal(r[1].item(), (2, 'dd', 2.0))
+        x1[1] = 34
+        assert_equal(r.a, np.array([1, 2, 3, 4]))
+
+    def test_recarray_fromfile(self):
+        data_dir = path.join(path.dirname(__file__), 'data')
+        filename = path.join(data_dir, 'recarray_from_file.fits')
+        fd = open(filename, 'rb')
+        fd.seek(2880 * 2)
+        r1 = np.rec.fromfile(fd, formats='f8,i4,S5', shape=3, byteorder='big')
+        fd.seek(2880 * 2)
+        r2 = np.rec.array(fd, formats='f8,i4,S5', shape=3, byteorder='big')
+        fd.seek(2880 * 2)
+        bytes_array = BytesIO()
+        bytes_array.write(fd.read())
+        bytes_array.seek(0)
+        r3 = np.rec.fromfile(
+            bytes_array, formats='f8,i4,S5', shape=3, byteorder='big'
+        )
+        fd.close()
+        assert_equal(r1, r2)
+        assert_equal(r2, r3)
+
+    def test_recarray_from_obj(self):
+        count = 10
+        a = np.zeros(count, dtype='O')
+        b = np.zeros(count, dtype='f8')
+        c = np.zeros(count, dtype='f8')
+        for i in range(len(a)):
+            a[i] = list(range(1, 10))
+
+        mine = np.rec.fromarrays([a, b, c], names='date,data1,data2')
+        for i in range(len(a)):
+            assert_(mine.date[i] == list(range(1, 10)))
+            assert_(mine.data1[i] == 0.0)
+            assert_(mine.data2[i] == 0.0)
+
+    def test_recarray_repr(self):
+        a = np.array([(1, 0.1), (2, 0.2)],
+                     dtype=[('foo', '<i4'), ('bar', '<f8')])
+        a = np.rec.array(a)
+        assert_equal(
+            repr(a),
+            textwrap.dedent("""\
+            rec.array([(1, 0.1), (2, 0.2)],
+                      dtype=[('foo', '<i4'), ('bar', '<f8')])""")
+        )
+
+        # make sure non-structured dtypes also show up as rec.array
+        a = np.array(np.ones(4, dtype='f8'))
+        assert_(repr(np.rec.array(a)).startswith('rec.array'))
+
+        # check that the 'np.record' part of the dtype isn't shown
+        a = np.rec.array(np.ones(3, dtype='i4,i4'))
+        assert_equal(repr(a).find('numpy.record'), -1)
+        a = np.rec.array(np.ones(3, dtype='i4'))
+        assert_(repr(a).find('dtype=int32') != -1)
+
+    def test_0d_recarray_repr(self):
+        arr_0d = np.rec.array((1, 2.0, '2003'), dtype='<i4,<f8,<M8[Y]')
+        assert_equal(repr(arr_0d), textwrap.dedent("""\
+            rec.array((1, 2., '2003'),
+                      dtype=[('f0', '<i4'), ('f1', '<f8'), ('f2', '<M8[Y]')])"""))
+
+        record = arr_0d[()]
+        assert_equal(repr(record),
+            "np.record((1, 2.0, '2003'), "
+            "dtype=[('f0', '<i4'), ('f1', '<f8'), ('f2', '<M8[Y]')])")
+        # 1.13 converted to python scalars before the repr
+        try:
+            np.set_printoptions(legacy='1.13')
+            assert_equal(repr(record), '(1, 2.0, datetime.date(2003, 1, 1))')
+        finally:
+            np.set_printoptions(legacy=False)
+
+    def test_recarray_from_repr(self):
+        a = np.array([(1,'ABC'), (2, "DEF")],
+                     dtype=[('foo', int), ('bar', 'S4')])
+        recordarr = np.rec.array(a)
+        recarr = a.view(np.recarray)
+        recordview = a.view(np.dtype((np.record, a.dtype)))
+
+        recordarr_r = eval("np." + repr(recordarr), {'np': np})
+        recarr_r = eval("np." + repr(recarr), {'np': np})
+        # Prints the type `numpy.record` as part of the dtype:
+        recordview_r = eval("np." + repr(recordview), {'np': np, 'numpy': np})
+
+        assert_equal(type(recordarr_r), np.recarray)
+        assert_equal(recordarr_r.dtype.type, np.record)
+        assert_equal(recordarr, recordarr_r)
+
+        assert_equal(type(recarr_r), np.recarray)
+        assert_equal(recarr_r.dtype.type, np.record)
+        assert_equal(recarr, recarr_r)
+
+        assert_equal(type(recordview_r), np.ndarray)
+        assert_equal(recordview.dtype.type, np.record)
+        assert_equal(recordview, recordview_r)
+
+    def test_recarray_views(self):
+        a = np.array([(1,'ABC'), (2, "DEF")],
+                     dtype=[('foo', int), ('bar', 'S4')])
+        b = np.array([1,2,3,4,5], dtype=np.int64)
+
+        #check that np.rec.array gives right dtypes
+        assert_equal(np.rec.array(a).dtype.type, np.record)
+        assert_equal(type(np.rec.array(a)), np.recarray)
+        assert_equal(np.rec.array(b).dtype.type, np.int64)
+        assert_equal(type(np.rec.array(b)), np.recarray)
+
+        #check that viewing as recarray does the same
+        assert_equal(a.view(np.recarray).dtype.type, np.record)
+        assert_equal(type(a.view(np.recarray)), np.recarray)
+        assert_equal(b.view(np.recarray).dtype.type, np.int64)
+        assert_equal(type(b.view(np.recarray)), np.recarray)
+
+        #check that view to non-structured dtype preserves type=np.recarray
+        r = np.rec.array(np.ones(4, dtype="f4,i4"))
+        rv = r.view('f8').view('f4,i4')
+        assert_equal(type(rv), np.recarray)
+        assert_equal(rv.dtype.type, np.record)
+
+        #check that getitem also preserves np.recarray and np.record
+        r = np.rec.array(np.ones(4, dtype=[('a', 'i4'), ('b', 'i4'),
+                                           ('c', 'i4,i4')]))
+        assert_equal(r['c'].dtype.type, np.record)
+        assert_equal(type(r['c']), np.recarray)
+
+        #and that it preserves subclasses (gh-6949)
+        class C(np.recarray):
+            pass
+
+        c = r.view(C)
+        assert_equal(type(c['c']), C)
+
+        # check that accessing nested structures keep record type, but
+        # not for subarrays, non-void structures, non-structured voids
+        test_dtype = [('a', 'f4,f4'), ('b', 'V8'), ('c', ('f4',2)),
+                      ('d', ('i8', 'i4,i4'))]
+        r = np.rec.array([((1,1), b'11111111', [1,1], 1),
+                          ((1,1), b'11111111', [1,1], 1)], dtype=test_dtype)
+        assert_equal(r.a.dtype.type, np.record)
+        assert_equal(r.b.dtype.type, np.void)
+        assert_equal(r.c.dtype.type, np.float32)
+        assert_equal(r.d.dtype.type, np.int64)
+        # check the same, but for views
+        r = np.rec.array(np.ones(4, dtype='i4,i4'))
+        assert_equal(r.view('f4,f4').dtype.type, np.record)
+        assert_equal(r.view(('i4',2)).dtype.type, np.int32)
+        assert_equal(r.view('V8').dtype.type, np.void)
+        assert_equal(r.view(('i8', 'i4,i4')).dtype.type, np.int64)
+
+        #check that we can undo the view
+        arrs = [np.ones(4, dtype='f4,i4'), np.ones(4, dtype='f8')]
+        for arr in arrs:
+            rec = np.rec.array(arr)
+            # recommended way to view as an ndarray:
+            arr2 = rec.view(rec.dtype.fields or rec.dtype, np.ndarray)
+            assert_equal(arr2.dtype.type, arr.dtype.type)
+            assert_equal(type(arr2), type(arr))
+
+    def test_recarray_from_names(self):
+        ra = np.rec.array([
+            (1, 'abc', 3.7000002861022949, 0),
+            (2, 'xy', 6.6999998092651367, 1),
+            (0, ' ', 0.40000000596046448, 0)],
+                       names='c1, c2, c3, c4')
+        pa = np.rec.fromrecords([
+            (1, 'abc', 3.7000002861022949, 0),
+            (2, 'xy', 6.6999998092651367, 1),
+            (0, ' ', 0.40000000596046448, 0)],
+                       names='c1, c2, c3, c4')
+        assert_(ra.dtype == pa.dtype)
+        assert_(ra.shape == pa.shape)
+        for k in range(len(ra)):
+            assert_(ra[k].item() == pa[k].item())
+
+    def test_recarray_conflict_fields(self):
+        ra = np.rec.array([(1, 'abc', 2.3), (2, 'xyz', 4.2),
+                        (3, 'wrs', 1.3)],
+                       names='field, shape, mean')
+        ra.mean = [1.1, 2.2, 3.3]
+        assert_array_almost_equal(ra['mean'], [1.1, 2.2, 3.3])
+        assert_(type(ra.mean) is type(ra.var))
+        ra.shape = (1, 3)
+        assert_(ra.shape == (1, 3))
+        ra.shape = ['A', 'B', 'C']
+        assert_array_equal(ra['shape'], [['A', 'B', 'C']])
+        ra.field = 5
+        assert_array_equal(ra['field'], [[5, 5, 5]])
+        assert_(isinstance(ra.field, collections.abc.Callable))
+
+    def test_fromrecords_with_explicit_dtype(self):
+        a = np.rec.fromrecords([(1, 'a'), (2, 'bbb')],
+                                dtype=[('a', int), ('b', object)])
+        assert_equal(a.a, [1, 2])
+        assert_equal(a[0].a, 1)
+        assert_equal(a.b, ['a', 'bbb'])
+        assert_equal(a[-1].b, 'bbb')
+        #
+        ndtype = np.dtype([('a', int), ('b', object)])
+        a = np.rec.fromrecords([(1, 'a'), (2, 'bbb')], dtype=ndtype)
+        assert_equal(a.a, [1, 2])
+        assert_equal(a[0].a, 1)
+        assert_equal(a.b, ['a', 'bbb'])
+        assert_equal(a[-1].b, 'bbb')
+
+    def test_recarray_stringtypes(self):
+        # Issue #3993
+        a = np.array([('abc ', 1), ('abc', 2)],
+                     dtype=[('foo', 'S4'), ('bar', int)])
+        a = a.view(np.recarray)
+        assert_equal(a.foo[0] == a.foo[1], False)
+
+    def test_recarray_returntypes(self):
+        qux_fields = {'C': (np.dtype('S5'), 0), 'D': (np.dtype('S5'), 6)}
+        a = np.rec.array([('abc ', (1,1), 1, ('abcde', 'fgehi')),
+                          ('abc', (2,3), 1, ('abcde', 'jklmn'))],
+                         dtype=[('foo', 'S4'),
+                                ('bar', [('A', int), ('B', int)]),
+                                ('baz', int), ('qux', qux_fields)])
+        assert_equal(type(a.foo), np.ndarray)
+        assert_equal(type(a['foo']), np.ndarray)
+        assert_equal(type(a.bar), np.recarray)
+        assert_equal(type(a['bar']), np.recarray)
+        assert_equal(a.bar.dtype.type, np.record)
+        assert_equal(type(a['qux']), np.recarray)
+        assert_equal(a.qux.dtype.type, np.record)
+        assert_equal(dict(a.qux.dtype.fields), qux_fields)
+        assert_equal(type(a.baz), np.ndarray)
+        assert_equal(type(a['baz']), np.ndarray)
+        assert_equal(type(a[0].bar), np.record)
+        assert_equal(type(a[0]['bar']), np.record)
+        assert_equal(a[0].bar.A, 1)
+        assert_equal(a[0].bar['A'], 1)
+        assert_equal(a[0]['bar'].A, 1)
+        assert_equal(a[0]['bar']['A'], 1)
+        assert_equal(a[0].qux.D, b'fgehi')
+        assert_equal(a[0].qux['D'], b'fgehi')
+        assert_equal(a[0]['qux'].D, b'fgehi')
+        assert_equal(a[0]['qux']['D'], b'fgehi')
+
+    def test_zero_width_strings(self):
+        # Test for #6430, based on the test case from #1901
+
+        cols = [['test'] * 3, [''] * 3]
+        rec = np.rec.fromarrays(cols)
+        assert_equal(rec['f0'], ['test', 'test', 'test'])
+        assert_equal(rec['f1'], ['', '', ''])
+
+        dt = np.dtype([('f0', '|S4'), ('f1', '|S')])
+        rec = np.rec.fromarrays(cols, dtype=dt)
+        assert_equal(rec.itemsize, 4)
+        assert_equal(rec['f0'], [b'test', b'test', b'test'])
+        assert_equal(rec['f1'], [b'', b'', b''])
+
+
+class TestPathUsage:
+    # Test that pathlib.Path can be used
+    def test_tofile_fromfile(self):
+        with temppath(suffix='.bin') as path:
+            path = Path(path)
+            np.random.seed(123)
+            a = np.random.rand(10).astype('f8,i4,S5')
+            a[5] = (0.5,10,'abcde')
+            with path.open("wb") as fd:
+                a.tofile(fd)
+            x = np._core.records.fromfile(
+                path, formats='f8,i4,S5', shape=10
+            )
+            assert_array_equal(x, a)
+
+
+class TestRecord:
+    def setup_method(self):
+        self.data = np.rec.fromrecords([(1, 2, 3), (4, 5, 6)],
+                            dtype=[("col1", "<i4"),
+                                   ("col2", "<i4"),
+                                   ("col3", "<i4")])
+
+    def test_assignment1(self):
+        a = self.data
+        assert_equal(a.col1[0], 1)
+        a[0].col1 = 0
+        assert_equal(a.col1[0], 0)
+
+    def test_assignment2(self):
+        a = self.data
+        assert_equal(a.col1[0], 1)
+        a.col1[0] = 0
+        assert_equal(a.col1[0], 0)
+
+    def test_invalid_assignment(self):
+        a = self.data
+
+        def assign_invalid_column(x):
+            x[0].col5 = 1
+
+        assert_raises(AttributeError, assign_invalid_column, a)
+
+    def test_nonwriteable_setfield(self):
+        # gh-8171
+        r = np.rec.array([(0,), (1,)], dtype=[('f', 'i4')])
+        r.flags.writeable = False
+        with assert_raises(ValueError):
+            r.f = [2, 3]
+        with assert_raises(ValueError):
+            r.setfield([2,3], *r.dtype.fields['f'])
+
+    def test_out_of_order_fields(self):
+        # names in the same order, padding added to descr
+        x = self.data[['col1', 'col2']]
+        assert_equal(x.dtype.names, ('col1', 'col2'))
+        assert_equal(x.dtype.descr,
+                     [('col1', '<i4'), ('col2', '<i4'), ('', '|V4')])
+
+        # names change order to match indexing, as of 1.14 - descr can't
+        # represent that
+        y = self.data[['col2', 'col1']]
+        assert_equal(y.dtype.names, ('col2', 'col1'))
+        assert_raises(ValueError, lambda: y.dtype.descr)
+
+    def test_pickle_1(self):
+        # Issue #1529
+        a = np.array([(1, [])], dtype=[('a', np.int32), ('b', np.int32, 0)])
+        for proto in range(2, pickle.HIGHEST_PROTOCOL + 1):
+            assert_equal(a, pickle.loads(pickle.dumps(a, protocol=proto)))
+            assert_equal(a[0], pickle.loads(pickle.dumps(a[0],
+                                                         protocol=proto)))
+
+    def test_pickle_2(self):
+        a = self.data
+        for proto in range(2, pickle.HIGHEST_PROTOCOL + 1):
+            assert_equal(a, pickle.loads(pickle.dumps(a, protocol=proto)))
+            assert_equal(a[0], pickle.loads(pickle.dumps(a[0],
+                                                         protocol=proto)))
+
+    def test_pickle_3(self):
+        # Issue #7140
+        a = self.data
+        for proto in range(2, pickle.HIGHEST_PROTOCOL + 1):
+            pa = pickle.loads(pickle.dumps(a[0], protocol=proto))
+            assert_(pa.flags.c_contiguous)
+            assert_(pa.flags.f_contiguous)
+            assert_(pa.flags.writeable)
+            assert_(pa.flags.aligned)
+
+    def test_pickle_void(self):
+        # issue gh-13593
+        dt = np.dtype([('obj', 'O'), ('int', 'i')])
+        a = np.empty(1, dtype=dt)
+        data = (bytearray(b'eman'),)
+        a['obj'] = data
+        a['int'] = 42
+        ctor, args = a[0].__reduce__()
+        # check the constructor is what we expect before interpreting the arguments
+        assert ctor is np._core.multiarray.scalar
+        dtype, obj = args
+        # make sure we did not pickle the address
+        assert not isinstance(obj, bytes)
+
+        assert_raises(RuntimeError, ctor, dtype, 13)
+
+        # Test roundtrip:
+        dump = pickle.dumps(a[0])
+        unpickled = pickle.loads(dump)
+        assert a[0] == unpickled
+
+        # Also check the similar (impossible) "object scalar" path:
+        with pytest.warns(DeprecationWarning):
+            assert ctor(np.dtype("O"), data) is data
+
+    def test_objview_record(self):
+        # https://github.com/numpy/numpy/issues/2599
+        dt = np.dtype([('foo', 'i8'), ('bar', 'O')])
+        r = np.zeros((1, 3), dtype=dt).view(np.recarray)
+        r.foo = np.array([1, 2, 3])  # TypeError?
+
+        # https://github.com/numpy/numpy/issues/3256
+        ra = np.recarray(
+            (2,), dtype=[('x', object), ('y', float), ('z', int)]
+        )
+        ra[['x','y']]  # TypeError?
+
+    def test_record_scalar_setitem(self):
+        # https://github.com/numpy/numpy/issues/3561
+        rec = np.recarray(1, dtype=[('x', float, 5)])
+        rec[0].x = 1
+        assert_equal(rec[0].x, np.ones(5))
+
+    def test_missing_field(self):
+        # https://github.com/numpy/numpy/issues/4806
+        arr = np.zeros((3,), dtype=[('x', int), ('y', int)])
+        assert_raises(KeyError, lambda: arr[['nofield']])
+
+    def test_fromarrays_nested_structured_arrays(self):
+        arrays = [
+            np.arange(10),
+            np.ones(10, dtype=[('a', '<u2'), ('b', '<f4')]),
+        ]
+        arr = np.rec.fromarrays(arrays)  # ValueError?
+
+    @pytest.mark.parametrize('nfields', [0, 1, 2])
+    def test_assign_dtype_attribute(self, nfields):
+        dt = np.dtype([('a', np.uint8), ('b', np.uint8), ('c', np.uint8)][:nfields])
+        data = np.zeros(3, dt).view(np.recarray)
+
+        # the original and resulting dtypes differ on whether they are records
+        assert data.dtype.type == np.record
+        assert dt.type != np.record
+
+        # ensure that the dtype remains a record even when assigned
+        data.dtype = dt
+        assert data.dtype.type == np.record
+
+    @pytest.mark.parametrize('nfields', [0, 1, 2])
+    def test_nested_fields_are_records(self, nfields):
+        """ Test that nested structured types are treated as records too """
+        dt = np.dtype([('a', np.uint8), ('b', np.uint8), ('c', np.uint8)][:nfields])
+        dt_outer = np.dtype([('inner', dt)])
+
+        data = np.zeros(3, dt_outer).view(np.recarray)
+        assert isinstance(data, np.recarray)
+        assert isinstance(data['inner'], np.recarray)
+
+        data0 = data[0]
+        assert isinstance(data0, np.record)
+        assert isinstance(data0['inner'], np.record)
+
+    def test_nested_dtype_padding(self):
+        """ test that trailing padding is preserved """
+        # construct a dtype with padding at the end
+        dt = np.dtype([('a', np.uint8), ('b', np.uint8), ('c', np.uint8)])
+        dt_padded_end = dt[['a', 'b']]
+        assert dt_padded_end.itemsize == dt.itemsize
+
+        dt_outer = np.dtype([('inner', dt_padded_end)])
+
+        data = np.zeros(3, dt_outer).view(np.recarray)
+        assert_equal(data['inner'].dtype, dt_padded_end)
+
+        data0 = data[0]
+        assert_equal(data0['inner'].dtype, dt_padded_end)
+
+
+def test_find_duplicate():
+    l1 = [1, 2, 3, 4, 5, 6]
+    assert_(np.rec.find_duplicate(l1) == [])
+
+    l2 = [1, 2, 1, 4, 5, 6]
+    assert_(np.rec.find_duplicate(l2) == [1])
+
+    l3 = [1, 2, 1, 4, 1, 6, 2, 3]
+    assert_(np.rec.find_duplicate(l3) == [1, 2])
+
+    l3 = [2, 2, 1, 4, 1, 6, 2, 3]
+    assert_(np.rec.find_duplicate(l3) == [2, 1])

mantis_evalkit/lib/python3.10/site-packages/numpy/_core/tests/test_scalar_ctors.py

@@ -0,0 +1,204 @@
+"""
+Test the scalar constructors, which also do type-coercion
+"""
+import pytest
+
+import numpy as np
+from numpy.testing import (
+    assert_equal, assert_almost_equal, assert_warns,
+    )
+
+class TestFromString:
+    def test_floating(self):
+        # Ticket #640, floats from string
+        fsingle = np.single('1.234')
+        fdouble = np.double('1.234')
+        flongdouble = np.longdouble('1.234')
+        assert_almost_equal(fsingle, 1.234)
+        assert_almost_equal(fdouble, 1.234)
+        assert_almost_equal(flongdouble, 1.234)
+
+    def test_floating_overflow(self):
+        """ Strings containing an unrepresentable float overflow """
+        fhalf = np.half('1e10000')
+        assert_equal(fhalf, np.inf)
+        fsingle = np.single('1e10000')
+        assert_equal(fsingle, np.inf)
+        fdouble = np.double('1e10000')
+        assert_equal(fdouble, np.inf)
+        flongdouble = assert_warns(RuntimeWarning, np.longdouble, '1e10000')
+        assert_equal(flongdouble, np.inf)
+
+        fhalf = np.half('-1e10000')
+        assert_equal(fhalf, -np.inf)
+        fsingle = np.single('-1e10000')
+        assert_equal(fsingle, -np.inf)
+        fdouble = np.double('-1e10000')
+        assert_equal(fdouble, -np.inf)
+        flongdouble = assert_warns(RuntimeWarning, np.longdouble, '-1e10000')
+        assert_equal(flongdouble, -np.inf)
+
+
+class TestExtraArgs:
+    def test_superclass(self):
+        # try both positional and keyword arguments
+        s = np.str_(b'\\x61', encoding='unicode-escape')
+        assert s == 'a'
+        s = np.str_(b'\\x61', 'unicode-escape')
+        assert s == 'a'
+
+        # previously this would return '\\xx'
+        with pytest.raises(UnicodeDecodeError):
+            np.str_(b'\\xx', encoding='unicode-escape')
+        with pytest.raises(UnicodeDecodeError):
+            np.str_(b'\\xx', 'unicode-escape')
+
+        # superclass fails, but numpy succeeds
+        assert np.bytes_(-2) == b'-2'
+
+    def test_datetime(self):
+        dt = np.datetime64('2000-01', ('M', 2))
+        assert np.datetime_data(dt) == ('M', 2)
+
+        with pytest.raises(TypeError):
+            np.datetime64('2000', garbage=True)
+
+    def test_bool(self):
+        with pytest.raises(TypeError):
+            np.bool(False, garbage=True)
+
+    def test_void(self):
+        with pytest.raises(TypeError):
+            np.void(b'test', garbage=True)
+
+
+class TestFromInt:
+    def test_intp(self):
+        # Ticket #99
+        assert_equal(1024, np.intp(1024))
+
+    def test_uint64_from_negative(self):
+        with pytest.raises(OverflowError):
+            np.uint64(-2)
+
+
+int_types = [np.byte, np.short, np.intc, np.long, np.longlong]
+uint_types = [np.ubyte, np.ushort, np.uintc, np.ulong, np.ulonglong]
+float_types = [np.half, np.single, np.double, np.longdouble]
+cfloat_types = [np.csingle, np.cdouble, np.clongdouble]
+
+
+class TestArrayFromScalar:
+    """ gh-15467 and gh-19125 """
+
+    def _do_test(self, t1, t2, arg=2):
+        if arg is None:
+            x = t1()
+        elif isinstance(arg, tuple):
+            if t1 is np.clongdouble:
+                pytest.xfail("creating a clongdouble from real and "
+                             "imaginary parts isn't supported")
+            x = t1(*arg)
+        else:
+            x = t1(arg)
+        arr = np.array(x, dtype=t2)
+        # type should be preserved exactly
+        if t2 is None:
+            assert arr.dtype.type is t1
+        else:
+            assert arr.dtype.type is t2
+
+    @pytest.mark.parametrize('t1', int_types + uint_types)
+    @pytest.mark.parametrize('t2', int_types + uint_types + [None])
+    def test_integers(self, t1, t2):
+        return self._do_test(t1, t2)
+
+    @pytest.mark.parametrize('t1', float_types)
+    @pytest.mark.parametrize('t2', float_types + [None])
+    def test_reals(self, t1, t2):
+        return self._do_test(t1, t2)
+
+    @pytest.mark.parametrize('t1', cfloat_types)
+    @pytest.mark.parametrize('t2', cfloat_types + [None])
+    @pytest.mark.parametrize('arg', [2, 1 + 3j, (1, 2), None])
+    def test_complex(self, t1, t2, arg):
+        self._do_test(t1, t2, arg)
+
+    @pytest.mark.parametrize('t', cfloat_types)
+    def test_complex_errors(self, t):
+        with pytest.raises(TypeError):
+            t(1j, 1j)
+        with pytest.raises(TypeError):
+            t(1, None)
+        with pytest.raises(TypeError):
+            t(None, 1)
+
+
+@pytest.mark.parametrize("length",
+        [5, np.int8(5), np.array(5, dtype=np.uint16)])
+def test_void_via_length(length):
+    res = np.void(length)
+    assert type(res) is np.void
+    assert res.item() == b"\0" * 5
+    assert res.dtype == "V5"
+
+@pytest.mark.parametrize("bytes_",
+        [b"spam", np.array(567.)])
+def test_void_from_byteslike(bytes_):
+    res = np.void(bytes_)
+    expected = bytes(bytes_)
+    assert type(res) is np.void
+    assert res.item() == expected
+
+    # Passing dtype can extend it (this is how filling works)
+    res = np.void(bytes_, dtype="V100")
+    assert type(res) is np.void
+    assert res.item()[:len(expected)] == expected
+    assert res.item()[len(expected):] == b"\0" * (res.nbytes - len(expected))
+    # As well as shorten:
+    res = np.void(bytes_, dtype="V4")
+    assert type(res) is np.void
+    assert res.item() == expected[:4]
+
+def test_void_arraylike_trumps_byteslike():
+    # The memoryview is converted as an array-like of shape (18,)
+    # rather than a single bytes-like of that length.
+    m = memoryview(b"just one mintleaf?")
+    res = np.void(m)
+    assert type(res) is np.ndarray
+    assert res.dtype == "V1"
+    assert res.shape == (18,)
+
+def test_void_dtype_arg():
+    # Basic test for the dtype argument (positional and keyword)
+    res = np.void((1, 2), dtype="i,i")
+    assert res.item() == (1, 2)
+    res = np.void((2, 3), "i,i")
+    assert res.item() == (2, 3)
+
+@pytest.mark.parametrize("data",
+        [5, np.int8(5), np.array(5, dtype=np.uint16)])
+def test_void_from_integer_with_dtype(data):
+    # The "length" meaning is ignored, rather data is used:
+    res = np.void(data, dtype="i,i")
+    assert type(res) is np.void
+    assert res.dtype == "i,i"
+    assert res["f0"] == 5 and res["f1"] == 5
+
+def test_void_from_structure():
+    dtype = np.dtype([('s', [('f', 'f8'), ('u', 'U1')]), ('i', 'i2')])
+    data = np.array(((1., 'a'), 2), dtype=dtype)
+    res = np.void(data[()], dtype=dtype)
+    assert type(res) is np.void
+    assert res.dtype == dtype
+    assert res == data[()]
+
+def test_void_bad_dtype():
+    with pytest.raises(TypeError,
+            match="void: descr must be a `void.*int64"):
+        np.void(4, dtype="i8")
+
+    # Subarray dtype (with shape `(4,)` is rejected):
+    with pytest.raises(TypeError,
+            match=r"void: descr must be a `void.*\(4,\)"):
+        np.void(4, dtype="4i")

mantis_evalkit/lib/python3.10/site-packages/numpy/_core/tests/test_scalarbuffer.py

@@ -0,0 +1,153 @@
+"""
+Test scalar buffer interface adheres to PEP 3118
+"""
+import numpy as np
+from numpy._core._rational_tests import rational
+from numpy._core._multiarray_tests import get_buffer_info
+import pytest
+
+from numpy.testing import assert_, assert_equal, assert_raises
+
+# PEP3118 format strings for native (standard alignment and byteorder) types
+scalars_and_codes = [
+    (np.bool, '?'),
+    (np.byte, 'b'),
+    (np.short, 'h'),
+    (np.intc, 'i'),
+    (np.long, 'l'),
+    (np.longlong, 'q'),
+    (np.ubyte, 'B'),
+    (np.ushort, 'H'),
+    (np.uintc, 'I'),
+    (np.ulong, 'L'),
+    (np.ulonglong, 'Q'),
+    (np.half, 'e'),
+    (np.single, 'f'),
+    (np.double, 'd'),
+    (np.longdouble, 'g'),
+    (np.csingle, 'Zf'),
+    (np.cdouble, 'Zd'),
+    (np.clongdouble, 'Zg'),
+]
+scalars_only, codes_only = zip(*scalars_and_codes)
+
+
+class TestScalarPEP3118:
+
+    @pytest.mark.parametrize('scalar', scalars_only, ids=codes_only)
+    def test_scalar_match_array(self, scalar):
+        x = scalar()
+        a = np.array([], dtype=np.dtype(scalar))
+        mv_x = memoryview(x)
+        mv_a = memoryview(a)
+        assert_equal(mv_x.format, mv_a.format)
+
+    @pytest.mark.parametrize('scalar', scalars_only, ids=codes_only)
+    def test_scalar_dim(self, scalar):
+        x = scalar()
+        mv_x = memoryview(x)
+        assert_equal(mv_x.itemsize, np.dtype(scalar).itemsize)
+        assert_equal(mv_x.ndim, 0)
+        assert_equal(mv_x.shape, ())
+        assert_equal(mv_x.strides, ())
+        assert_equal(mv_x.suboffsets, ())
+
+    @pytest.mark.parametrize('scalar, code', scalars_and_codes, ids=codes_only)
+    def test_scalar_code_and_properties(self, scalar, code):
+        x = scalar()
+        expected = dict(strides=(), itemsize=x.dtype.itemsize, ndim=0,
+                        shape=(), format=code, readonly=True)
+
+        mv_x = memoryview(x)
+        assert self._as_dict(mv_x) == expected
+
+    @pytest.mark.parametrize('scalar', scalars_only, ids=codes_only)
+    def test_scalar_buffers_readonly(self, scalar):
+        x = scalar()
+        with pytest.raises(BufferError, match="scalar buffer is readonly"):
+            get_buffer_info(x, ["WRITABLE"])
+
+    def test_void_scalar_structured_data(self):
+        dt = np.dtype([('name', np.str_, 16), ('grades', np.float64, (2,))])
+        x = np.array(('ndarray_scalar', (1.2, 3.0)), dtype=dt)[()]
+        assert_(isinstance(x, np.void))
+        mv_x = memoryview(x)
+        expected_size = 16 * np.dtype((np.str_, 1)).itemsize
+        expected_size += 2 * np.dtype(np.float64).itemsize
+        assert_equal(mv_x.itemsize, expected_size)
+        assert_equal(mv_x.ndim, 0)
+        assert_equal(mv_x.shape, ())
+        assert_equal(mv_x.strides, ())
+        assert_equal(mv_x.suboffsets, ())
+
+        # check scalar format string against ndarray format string
+        a = np.array([('Sarah', (8.0, 7.0)), ('John', (6.0, 7.0))], dtype=dt)
+        assert_(isinstance(a, np.ndarray))
+        mv_a = memoryview(a)
+        assert_equal(mv_x.itemsize, mv_a.itemsize)
+        assert_equal(mv_x.format, mv_a.format)
+
+        # Check that we do not allow writeable buffer export (technically
+        # we could allow it sometimes here...)
+        with pytest.raises(BufferError, match="scalar buffer is readonly"):
+            get_buffer_info(x, ["WRITABLE"])
+
+    def _as_dict(self, m):
+        return dict(strides=m.strides, shape=m.shape, itemsize=m.itemsize,
+                    ndim=m.ndim, format=m.format, readonly=m.readonly)
+
+    def test_datetime_memoryview(self):
+        # gh-11656
+        # Values verified with v1.13.3, shape is not () as in test_scalar_dim
+
+        dt1 = np.datetime64('2016-01-01')
+        dt2 = np.datetime64('2017-01-01')
+        expected = dict(strides=(1,), itemsize=1, ndim=1, shape=(8,),
+                        format='B', readonly=True)
+        v = memoryview(dt1)
+        assert self._as_dict(v) == expected
+
+        v = memoryview(dt2 - dt1)
+        assert self._as_dict(v) == expected
+
+        dt = np.dtype([('a', 'uint16'), ('b', 'M8[s]')])
+        a = np.empty(1, dt)
+        # Fails to create a PEP 3118 valid buffer
+        assert_raises((ValueError, BufferError), memoryview, a[0])
+
+        # Check that we do not allow writeable buffer export
+        with pytest.raises(BufferError, match="scalar buffer is readonly"):
+            get_buffer_info(dt1, ["WRITABLE"])
+
+    @pytest.mark.parametrize('s', [
+        pytest.param("\x32\x32", id="ascii"),
+        pytest.param("\uFE0F\uFE0F", id="basic multilingual"),
+        pytest.param("\U0001f4bb\U0001f4bb", id="non-BMP"),
+    ])
+    def test_str_ucs4(self, s):
+        s = np.str_(s)  # only our subclass implements the buffer protocol
+
+        # all the same, characters always encode as ucs4
+        expected = dict(strides=(), itemsize=8, ndim=0, shape=(), format='2w',
+                        readonly=True)
+
+        v = memoryview(s)
+        assert self._as_dict(v) == expected
+
+        # integers of the paltform-appropriate endianness
+        code_points = np.frombuffer(v, dtype='i4')
+
+        assert_equal(code_points, [ord(c) for c in s])
+
+        # Check that we do not allow writeable buffer export
+        with pytest.raises(BufferError, match="scalar buffer is readonly"):
+            get_buffer_info(s, ["WRITABLE"])
+
+    def test_user_scalar_fails_buffer(self):
+        r = rational(1)
+        with assert_raises(TypeError):
+            memoryview(r)
+
+        # Check that we do not allow writeable buffer export
+        with pytest.raises(BufferError, match="scalar buffer is readonly"):
+            get_buffer_info(r, ["WRITABLE"])

mantis_evalkit/lib/python3.10/site-packages/numpy/_core/tests/test_scalarprint.py

@@ -0,0 +1,382 @@
+""" Test printing of scalar types.
+
+"""
+import code
+import platform
+import pytest
+import sys
+
+from tempfile import TemporaryFile
+import numpy as np
+from numpy.testing import assert_, assert_equal, assert_raises, IS_MUSL
+
+class TestRealScalars:
+    def test_str(self):
+        svals = [0.0, -0.0, 1, -1, np.inf, -np.inf, np.nan]
+        styps = [np.float16, np.float32, np.float64, np.longdouble]
+        wanted = [
+             ['0.0',  '0.0',  '0.0',  '0.0' ],
+             ['-0.0', '-0.0', '-0.0', '-0.0'],
+             ['1.0',  '1.0',  '1.0',  '1.0' ],
+             ['-1.0', '-1.0', '-1.0', '-1.0'],
+             ['inf',  'inf',  'inf',  'inf' ],
+             ['-inf', '-inf', '-inf', '-inf'],
+             ['nan',  'nan',  'nan',  'nan']]
+
+        for wants, val in zip(wanted, svals):
+            for want, styp in zip(wants, styps):
+                msg = 'for str({}({}))'.format(np.dtype(styp).name, repr(val))
+                assert_equal(str(styp(val)), want, err_msg=msg)
+
+    def test_scalar_cutoffs(self):
+        # test that both the str and repr of np.float64 behaves
+        # like python floats in python3.
+        def check(v):
+            assert_equal(str(np.float64(v)), str(v))
+            assert_equal(str(np.float64(v)), repr(v))
+            assert_equal(repr(np.float64(v)), f"np.float64({v!r})")
+            assert_equal(repr(np.float64(v)), f"np.float64({v})")
+
+        # check we use the same number of significant digits
+        check(1.12345678901234567890)
+        check(0.0112345678901234567890)
+
+        # check switch from scientific output to positional and back
+        check(1e-5)
+        check(1e-4)
+        check(1e15)
+        check(1e16)
+
+    def test_py2_float_print(self):
+        # gh-10753
+        # In python2, the python float type implements an obsolete method
+        # tp_print, which overrides tp_repr and tp_str when using "print" to
+        # output to a "real file" (ie, not a StringIO). Make sure we don't
+        # inherit it.
+        x = np.double(0.1999999999999)
+        with TemporaryFile('r+t') as f:
+            print(x, file=f)
+            f.seek(0)
+            output = f.read()
+        assert_equal(output, str(x) + '\n')
+        # In python2 the value float('0.1999999999999') prints with reduced
+        # precision as '0.2', but we want numpy's np.double('0.1999999999999')
+        # to print the unique value, '0.1999999999999'.
+
+        # gh-11031
+        # Only in the python2 interactive shell and when stdout is a "real"
+        # file, the output of the last command is printed to stdout without
+        # Py_PRINT_RAW (unlike the print statement) so `>>> x` and `>>> print
+        # x` are potentially different. Make sure they are the same. The only
+        # way I found to get prompt-like output is using an actual prompt from
+        # the 'code' module. Again, must use tempfile to get a "real" file.
+
+        # dummy user-input which enters one line and then ctrl-Ds.
+        def userinput():
+            yield 'np.sqrt(2)'
+            raise EOFError
+        gen = userinput()
+        input_func = lambda prompt="": next(gen)
+
+        with TemporaryFile('r+t') as fo, TemporaryFile('r+t') as fe:
+            orig_stdout, orig_stderr = sys.stdout, sys.stderr
+            sys.stdout, sys.stderr = fo, fe
+
+            code.interact(local={'np': np}, readfunc=input_func, banner='')
+
+            sys.stdout, sys.stderr = orig_stdout, orig_stderr
+
+            fo.seek(0)
+            capture = fo.read().strip()
+
+        assert_equal(capture, repr(np.sqrt(2)))
+
+    def test_dragon4(self):
+        # these tests are adapted from Ryan Juckett's dragon4 implementation,
+        # see dragon4.c for details.
+
+        fpos32 = lambda x, **k: np.format_float_positional(np.float32(x), **k)
+        fsci32 = lambda x, **k: np.format_float_scientific(np.float32(x), **k)
+        fpos64 = lambda x, **k: np.format_float_positional(np.float64(x), **k)
+        fsci64 = lambda x, **k: np.format_float_scientific(np.float64(x), **k)
+
+        preckwd = lambda prec: {'unique': False, 'precision': prec}
+
+        assert_equal(fpos32('1.0'), "1.")
+        assert_equal(fsci32('1.0'), "1.e+00")
+        assert_equal(fpos32('10.234'), "10.234")
+        assert_equal(fpos32('-10.234'), "-10.234")
+        assert_equal(fsci32('10.234'), "1.0234e+01")
+        assert_equal(fsci32('-10.234'), "-1.0234e+01")
+        assert_equal(fpos32('1000.0'), "1000.")
+        assert_equal(fpos32('1.0', precision=0), "1.")
+        assert_equal(fsci32('1.0', precision=0), "1.e+00")
+        assert_equal(fpos32('10.234', precision=0), "10.")
+        assert_equal(fpos32('-10.234', precision=0), "-10.")
+        assert_equal(fsci32('10.234', precision=0), "1.e+01")
+        assert_equal(fsci32('-10.234', precision=0), "-1.e+01")
+        assert_equal(fpos32('10.234', precision=2), "10.23")
+        assert_equal(fsci32('-10.234', precision=2), "-1.02e+01")
+        assert_equal(fsci64('9.9999999999999995e-08', **preckwd(16)),
+                            '9.9999999999999995e-08')
+        assert_equal(fsci64('9.8813129168249309e-324', **preckwd(16)),
+                            '9.8813129168249309e-324')
+        assert_equal(fsci64('9.9999999999999694e-311', **preckwd(16)),
+                            '9.9999999999999694e-311')
+
+
+        # test rounding
+        # 3.1415927410 is closest float32 to np.pi
+        assert_equal(fpos32('3.14159265358979323846', **preckwd(10)),
+                            "3.1415927410")
+        assert_equal(fsci32('3.14159265358979323846', **preckwd(10)),
+                            "3.1415927410e+00")
+        assert_equal(fpos64('3.14159265358979323846', **preckwd(10)),
+                            "3.1415926536")
+        assert_equal(fsci64('3.14159265358979323846', **preckwd(10)),
+                            "3.1415926536e+00")
+        # 299792448 is closest float32 to 299792458
+        assert_equal(fpos32('299792458.0', **preckwd(5)), "299792448.00000")
+        assert_equal(fsci32('299792458.0', **preckwd(5)), "2.99792e+08")
+        assert_equal(fpos64('299792458.0', **preckwd(5)), "299792458.00000")
+        assert_equal(fsci64('299792458.0', **preckwd(5)), "2.99792e+08")
+
+        assert_equal(fpos32('3.14159265358979323846', **preckwd(25)),
+                            "3.1415927410125732421875000")
+        assert_equal(fpos64('3.14159265358979323846', **preckwd(50)),
+                         "3.14159265358979311599796346854418516159057617187500")
+        assert_equal(fpos64('3.14159265358979323846'), "3.141592653589793")
+
+
+        # smallest numbers
+        assert_equal(fpos32(0.5**(126 + 23), unique=False, precision=149),
+                    "0.00000000000000000000000000000000000000000000140129846432"
+                    "4817070923729583289916131280261941876515771757068283889791"
+                    "08268586060148663818836212158203125")
+
+        assert_equal(fpos64(5e-324, unique=False, precision=1074),
+                    "0.00000000000000000000000000000000000000000000000000000000"
+                    "0000000000000000000000000000000000000000000000000000000000"
+                    "0000000000000000000000000000000000000000000000000000000000"
+                    "0000000000000000000000000000000000000000000000000000000000"
+                    "0000000000000000000000000000000000000000000000000000000000"
+                    "0000000000000000000000000000000000049406564584124654417656"
+                    "8792868221372365059802614324764425585682500675507270208751"
+                    "8652998363616359923797965646954457177309266567103559397963"
+                    "9877479601078187812630071319031140452784581716784898210368"
+                    "8718636056998730723050006387409153564984387312473397273169"
+                    "6151400317153853980741262385655911710266585566867681870395"
+                    "6031062493194527159149245532930545654440112748012970999954"
+                    "1931989409080416563324524757147869014726780159355238611550"
+                    "1348035264934720193790268107107491703332226844753335720832"
+                    "4319360923828934583680601060115061698097530783422773183292"
+                    "4790498252473077637592724787465608477820373446969953364701"
+                    "7972677717585125660551199131504891101451037862738167250955"
+                    "8373897335989936648099411642057026370902792427675445652290"
+                    "87538682506419718265533447265625")
+
+        # largest numbers
+        f32x = np.finfo(np.float32).max
+        assert_equal(fpos32(f32x, **preckwd(0)),
+                    "340282346638528859811704183484516925440.")
+        assert_equal(fpos64(np.finfo(np.float64).max, **preckwd(0)),
+                    "1797693134862315708145274237317043567980705675258449965989"
+                    "1747680315726078002853876058955863276687817154045895351438"
+                    "2464234321326889464182768467546703537516986049910576551282"
+                    "0762454900903893289440758685084551339423045832369032229481"
+                    "6580855933212334827479782620414472316873817718091929988125"
+                    "0404026184124858368.")
+        # Warning: In unique mode only the integer digits necessary for
+        # uniqueness are computed, the rest are 0.
+        assert_equal(fpos32(f32x),
+                    "340282350000000000000000000000000000000.")
+
+        # Further tests of zero-padding vs rounding in different combinations
+        # of unique, fractional, precision, min_digits
+        # precision can only reduce digits, not add them.
+        # min_digits can only extend digits, not reduce them.
+        assert_equal(fpos32(f32x, unique=True, fractional=True, precision=0),
+                    "340282350000000000000000000000000000000.")
+        assert_equal(fpos32(f32x, unique=True, fractional=True, precision=4),
+                    "340282350000000000000000000000000000000.")
+        assert_equal(fpos32(f32x, unique=True, fractional=True, min_digits=0),
+                    "340282346638528859811704183484516925440.")
+        assert_equal(fpos32(f32x, unique=True, fractional=True, min_digits=4),
+                    "340282346638528859811704183484516925440.0000")
+        assert_equal(fpos32(f32x, unique=True, fractional=True,
+                                    min_digits=4, precision=4),
+                    "340282346638528859811704183484516925440.0000")
+        assert_raises(ValueError, fpos32, f32x, unique=True, fractional=False,
+                                          precision=0)
+        assert_equal(fpos32(f32x, unique=True, fractional=False, precision=4),
+                    "340300000000000000000000000000000000000.")
+        assert_equal(fpos32(f32x, unique=True, fractional=False, precision=20),
+                    "340282350000000000000000000000000000000.")
+        assert_equal(fpos32(f32x, unique=True, fractional=False, min_digits=4),
+                    "340282350000000000000000000000000000000.")
+        assert_equal(fpos32(f32x, unique=True, fractional=False,
+                                  min_digits=20),
+                    "340282346638528859810000000000000000000.")
+        assert_equal(fpos32(f32x, unique=True, fractional=False,
+                                  min_digits=15),
+                    "340282346638529000000000000000000000000.")
+        assert_equal(fpos32(f32x, unique=False, fractional=False, precision=4),
+                    "340300000000000000000000000000000000000.")
+        # test that unique rounding is preserved when precision is supplied
+        # but no extra digits need to be printed (gh-18609)
+        a = np.float64.fromhex('-1p-97')
+        assert_equal(fsci64(a, unique=True), '-6.310887241768095e-30')
+        assert_equal(fsci64(a, unique=False, precision=15),
+                     '-6.310887241768094e-30')
+        assert_equal(fsci64(a, unique=True, precision=15),
+                     '-6.310887241768095e-30')
+        assert_equal(fsci64(a, unique=True, min_digits=15),
+                     '-6.310887241768095e-30')
+        assert_equal(fsci64(a, unique=True, precision=15, min_digits=15),
+                     '-6.310887241768095e-30')
+        # adds/remove digits in unique mode with unbiased rnding
+        assert_equal(fsci64(a, unique=True, precision=14),
+                     '-6.31088724176809e-30')
+        assert_equal(fsci64(a, unique=True, min_digits=16),
+                     '-6.3108872417680944e-30')
+        assert_equal(fsci64(a, unique=True, precision=16),
+                     '-6.310887241768095e-30')
+        assert_equal(fsci64(a, unique=True, min_digits=14),
+                     '-6.310887241768095e-30')
+        # test min_digits in unique mode with different rounding cases
+        assert_equal(fsci64('1e120', min_digits=3), '1.000e+120')
+        assert_equal(fsci64('1e100', min_digits=3), '1.000e+100')
+
+        # test trailing zeros
+        assert_equal(fpos32('1.0', unique=False, precision=3), "1.000")
+        assert_equal(fpos64('1.0', unique=False, precision=3), "1.000")
+        assert_equal(fsci32('1.0', unique=False, precision=3), "1.000e+00")
+        assert_equal(fsci64('1.0', unique=False, precision=3), "1.000e+00")
+        assert_equal(fpos32('1.5', unique=False, precision=3), "1.500")
+        assert_equal(fpos64('1.5', unique=False, precision=3), "1.500")
+        assert_equal(fsci32('1.5', unique=False, precision=3), "1.500e+00")
+        assert_equal(fsci64('1.5', unique=False, precision=3), "1.500e+00")
+        # gh-10713
+        assert_equal(fpos64('324', unique=False, precision=5,
+                                   fractional=False), "324.00")
+
+    def test_dragon4_interface(self):
+        tps = [np.float16, np.float32, np.float64]
+        # test is flaky for musllinux on np.float128
+        if hasattr(np, 'float128') and not IS_MUSL:
+            tps.append(np.float128)
+
+        fpos = np.format_float_positional
+        fsci = np.format_float_scientific
+
+        for tp in tps:
+            # test padding
+            assert_equal(fpos(tp('1.0'), pad_left=4, pad_right=4), "   1.    ")
+            assert_equal(fpos(tp('-1.0'), pad_left=4, pad_right=4), "  -1.    ")
+            assert_equal(fpos(tp('-10.2'),
+                         pad_left=4, pad_right=4), " -10.2   ")
+
+            # test exp_digits
+            assert_equal(fsci(tp('1.23e1'), exp_digits=5), "1.23e+00001")
+
+            # test fixed (non-unique) mode
+            assert_equal(fpos(tp('1.0'), unique=False, precision=4), "1.0000")
+            assert_equal(fsci(tp('1.0'), unique=False, precision=4),
+                         "1.0000e+00")
+
+            # test trimming
+            # trim of 'k' or '.' only affects non-unique mode, since unique
+            # mode will not output trailing 0s.
+            assert_equal(fpos(tp('1.'), unique=False, precision=4, trim='k'),
+                         "1.0000")
+
+            assert_equal(fpos(tp('1.'), unique=False, precision=4, trim='.'),
+                         "1.")
+            assert_equal(fpos(tp('1.2'), unique=False, precision=4, trim='.'),
+                         "1.2" if tp != np.float16 else "1.2002")
+
+            assert_equal(fpos(tp('1.'), unique=False, precision=4, trim='0'),
+                         "1.0")
+            assert_equal(fpos(tp('1.2'), unique=False, precision=4, trim='0'),
+                         "1.2" if tp != np.float16 else "1.2002")
+            assert_equal(fpos(tp('1.'), trim='0'), "1.0")
+
+            assert_equal(fpos(tp('1.'), unique=False, precision=4, trim='-'),
+                         "1")
+            assert_equal(fpos(tp('1.2'), unique=False, precision=4, trim='-'),
+                         "1.2" if tp != np.float16 else "1.2002")
+            assert_equal(fpos(tp('1.'), trim='-'), "1")
+            assert_equal(fpos(tp('1.001'), precision=1, trim='-'), "1")
+
+    @pytest.mark.skipif(not platform.machine().startswith("ppc64"),
+                        reason="only applies to ppc float128 values")
+    def test_ppc64_ibm_double_double128(self):
+        # check that the precision decreases once we get into the subnormal
+        # range. Unlike float64, this starts around 1e-292 instead of 1e-308,
+        # which happens when the first double is normal and the second is
+        # subnormal.
+        x = np.float128('2.123123123123123123123123123123123e-286')
+        got = [str(x/np.float128('2e' + str(i))) for i in range(0,40)]
+        expected = [
+            "1.06156156156156156156156156156157e-286",
+            "1.06156156156156156156156156156158e-287",
+            "1.06156156156156156156156156156159e-288",
+            "1.0615615615615615615615615615616e-289",
+            "1.06156156156156156156156156156157e-290",
+            "1.06156156156156156156156156156156e-291",
+            "1.0615615615615615615615615615616e-292",
+            "1.0615615615615615615615615615615e-293",
+            "1.061561561561561561561561561562e-294",
+            "1.06156156156156156156156156155e-295",
+            "1.0615615615615615615615615616e-296",
+            "1.06156156156156156156156156e-297",
+            "1.06156156156156156156156157e-298",
+            "1.0615615615615615615615616e-299",
+            "1.06156156156156156156156e-300",
+            "1.06156156156156156156155e-301",
+            "1.0615615615615615615616e-302",
+            "1.061561561561561561562e-303",
+            "1.06156156156156156156e-304",
+            "1.0615615615615615618e-305",
+            "1.06156156156156156e-306",
+            "1.06156156156156157e-307",
+            "1.0615615615615616e-308",
+            "1.06156156156156e-309",
+            "1.06156156156157e-310",
+            "1.0615615615616e-311",
+            "1.06156156156e-312",
+            "1.06156156154e-313",
+            "1.0615615616e-314",
+            "1.06156156e-315",
+            "1.06156155e-316",
+            "1.061562e-317",
+            "1.06156e-318",
+            "1.06155e-319",
+            "1.0617e-320",
+            "1.06e-321",
+            "1.04e-322",
+            "1e-323",
+            "0.0",
+            "0.0"]
+        assert_equal(got, expected)
+
+        # Note: we follow glibc behavior, but it (or gcc) might not be right.
+        # In particular we can get two values that print the same but are not
+        # equal:
+        a = np.float128('2')/np.float128('3')
+        b = np.float128(str(a))
+        assert_equal(str(a), str(b))
+        assert_(a != b)
+
+    def float32_roundtrip(self):
+        # gh-9360
+        x = np.float32(1024 - 2**-14)
+        y = np.float32(1024 - 2**-13)
+        assert_(repr(x) != repr(y))
+        assert_equal(np.float32(repr(x)), x)
+        assert_equal(np.float32(repr(y)), y)
+
+    def float64_vs_python(self):
+        # gh-2643, gh-6136, gh-6908
+        assert_equal(repr(np.float64(0.1)), repr(0.1))
+        assert_(repr(np.float64(0.20000000000000004)) != repr(0.2))

mantis_evalkit/lib/python3.10/site-packages/numpy/_core/tests/test_simd_module.py

@@ -0,0 +1,101 @@
+import pytest
+from numpy._core._simd import targets
+"""
+This testing unit only for checking the sanity of common functionality,
+therefore all we need is just to take one submodule that represents any
+of enabled SIMD extensions to run the test on it and the second submodule
+required to run only one check related to the possibility of mixing
+the data types among each submodule.
+"""
+npyvs = [npyv_mod for npyv_mod in targets.values() if npyv_mod and npyv_mod.simd]
+npyv, npyv2 = (npyvs + [None, None])[:2]
+
+unsigned_sfx = ["u8", "u16", "u32", "u64"]
+signed_sfx = ["s8", "s16", "s32", "s64"]
+fp_sfx = []
+if npyv and npyv.simd_f32:
+    fp_sfx.append("f32")
+if npyv and npyv.simd_f64:
+    fp_sfx.append("f64")
+
+int_sfx = unsigned_sfx + signed_sfx
+all_sfx = unsigned_sfx + int_sfx
+
+@pytest.mark.skipif(not npyv, reason="could not find any SIMD extension with NPYV support")
+class Test_SIMD_MODULE:
+
+    @pytest.mark.parametrize('sfx', all_sfx)
+    def test_num_lanes(self, sfx):
+        nlanes = getattr(npyv, "nlanes_" + sfx)
+        vector = getattr(npyv, "setall_" + sfx)(1)
+        assert len(vector) == nlanes
+
+    @pytest.mark.parametrize('sfx', all_sfx)
+    def test_type_name(self, sfx):
+        vector = getattr(npyv, "setall_" + sfx)(1)
+        assert vector.__name__ == "npyv_" + sfx
+
+    def test_raises(self):
+        a, b = [npyv.setall_u32(1)]*2
+        for sfx in all_sfx:
+            vcb = lambda intrin: getattr(npyv, f"{intrin}_{sfx}")
+            pytest.raises(TypeError, vcb("add"), a)
+            pytest.raises(TypeError, vcb("add"), a, b, a)
+            pytest.raises(TypeError, vcb("setall"))
+            pytest.raises(TypeError, vcb("setall"), [1])
+            pytest.raises(TypeError, vcb("load"), 1)
+            pytest.raises(ValueError, vcb("load"), [1])
+            pytest.raises(ValueError, vcb("store"), [1], getattr(npyv, f"reinterpret_{sfx}_u32")(a))
+
+    @pytest.mark.skipif(not npyv2, reason=(
+        "could not find a second SIMD extension with NPYV support"
+    ))
+    def test_nomix(self):
+        # mix among submodules isn't allowed
+        a = npyv.setall_u32(1)
+        a2 = npyv2.setall_u32(1)
+        pytest.raises(TypeError, npyv.add_u32, a2, a2)
+        pytest.raises(TypeError, npyv2.add_u32, a, a)
+
+    @pytest.mark.parametrize('sfx', unsigned_sfx)
+    def test_unsigned_overflow(self, sfx):
+        nlanes = getattr(npyv, "nlanes_" + sfx)
+        maxu = (1 << int(sfx[1:])) - 1
+        maxu_72 = (1 << 72) - 1
+        lane = getattr(npyv, "setall_" + sfx)(maxu_72)[0]
+        assert lane == maxu
+        lanes = getattr(npyv, "load_" + sfx)([maxu_72] * nlanes)
+        assert lanes == [maxu] * nlanes
+        lane = getattr(npyv, "setall_" + sfx)(-1)[0]
+        assert lane == maxu
+        lanes = getattr(npyv, "load_" + sfx)([-1] * nlanes)
+        assert lanes == [maxu] * nlanes
+
+    @pytest.mark.parametrize('sfx', signed_sfx)
+    def test_signed_overflow(self, sfx):
+        nlanes = getattr(npyv, "nlanes_" + sfx)
+        maxs_72 = (1 << 71) - 1
+        lane = getattr(npyv, "setall_" + sfx)(maxs_72)[0]
+        assert lane == -1
+        lanes = getattr(npyv, "load_" + sfx)([maxs_72] * nlanes)
+        assert lanes == [-1] * nlanes
+        mins_72 = -1 << 71
+        lane = getattr(npyv, "setall_" + sfx)(mins_72)[0]
+        assert lane == 0
+        lanes = getattr(npyv, "load_" + sfx)([mins_72] * nlanes)
+        assert lanes == [0] * nlanes
+
+    def test_truncate_f32(self):
+        if not npyv.simd_f32:
+            pytest.skip("F32 isn't support by the SIMD extension")
+        f32 = npyv.setall_f32(0.1)[0]
+        assert f32 != 0.1
+        assert round(f32, 1) == 0.1
+
+    def test_compare(self):
+        data_range = range(0, npyv.nlanes_u32)
+        vdata = npyv.load_u32(data_range)
+        assert vdata == list(data_range)
+        assert vdata == tuple(data_range)
+        for i in data_range:
+            assert vdata[i] == data_range[i]

mantis_evalkit/lib/python3.10/site-packages/numpy/_core/tests/test_stringdtype.py

@@ -0,0 +1,1813 @@
+import concurrent.futures
+import itertools
+import os
+import pickle
+import string
+import sys
+import tempfile
+
+import numpy as np
+import pytest
+
+from numpy.dtypes import StringDType
+from numpy._core.tests._natype import pd_NA
+from numpy.testing import assert_array_equal, IS_WASM, IS_PYPY
+
+
+@pytest.fixture
+def string_list():
+    return ["abc", "def", "ghi" * 10, "A¢☃€ 😊" * 100, "Abc" * 1000, "DEF"]
+
+
+@pytest.fixture
+def random_string_list():
+    chars = list(string.ascii_letters + string.digits)
+    chars = np.array(chars, dtype="U1")
+    ret = np.random.choice(chars, size=100 * 10, replace=True)
+    return ret.view("U100")
+
+
+@pytest.fixture(params=[True, False])
+def coerce(request):
+    return request.param
+
+
+@pytest.fixture(
+    params=["unset", None, pd_NA, np.nan, float("nan"), "__nan__"],
+    ids=["unset", "None", "pandas.NA", "np.nan", "float('nan')", "string nan"],
+)
+def na_object(request):
+    return request.param
+
+
+def get_dtype(na_object, coerce=True):
+    # explicit is check for pd_NA because != with pd_NA returns pd_NA
+    if na_object is pd_NA or na_object != "unset":
+        return StringDType(na_object=na_object, coerce=coerce)
+    else:
+        return StringDType(coerce=coerce)
+
+
+@pytest.fixture()
+def dtype(na_object, coerce):
+    return get_dtype(na_object, coerce)
+
+
+# second copy for cast tests to do a cartesian product over dtypes
+@pytest.fixture(params=[True, False])
+def coerce2(request):
+    return request.param
+
+
+@pytest.fixture(
+    params=["unset", None, pd_NA, np.nan, float("nan"), "__nan__"],
+    ids=["unset", "None", "pandas.NA", "np.nan", "float('nan')", "string nan"],
+)
+def na_object2(request):
+    return request.param
+
+
+@pytest.fixture()
+def dtype2(na_object2, coerce2):
+    # explicit is check for pd_NA because != with pd_NA returns pd_NA
+    if na_object2 is pd_NA or na_object2 != "unset":
+        return StringDType(na_object=na_object2, coerce=coerce2)
+    else:
+        return StringDType(coerce=coerce2)
+
+
+def test_dtype_creation():
+    hashes = set()
+    dt = StringDType()
+    assert not hasattr(dt, "na_object") and dt.coerce is True
+    hashes.add(hash(dt))
+
+    dt = StringDType(na_object=None)
+    assert dt.na_object is None and dt.coerce is True
+    hashes.add(hash(dt))
+
+    dt = StringDType(coerce=False)
+    assert not hasattr(dt, "na_object") and dt.coerce is False
+    hashes.add(hash(dt))
+
+    dt = StringDType(na_object=None, coerce=False)
+    assert dt.na_object is None and dt.coerce is False
+    hashes.add(hash(dt))
+
+    assert len(hashes) == 4
+
+    dt = np.dtype("T")
+    assert dt == StringDType()
+    assert dt.kind == "T"
+    assert dt.char == "T"
+
+    hashes.add(hash(dt))
+    assert len(hashes) == 4
+
+
+def test_dtype_equality(dtype):
+    assert dtype == dtype
+    for ch in "SU":
+        assert dtype != np.dtype(ch)
+        assert dtype != np.dtype(f"{ch}8")
+
+
+def test_dtype_repr(dtype):
+    if not hasattr(dtype, "na_object") and dtype.coerce:
+        assert repr(dtype) == "StringDType()"
+    elif dtype.coerce:
+        assert repr(dtype) == f"StringDType(na_object={dtype.na_object!r})"
+    elif not hasattr(dtype, "na_object"):
+        assert repr(dtype) == "StringDType(coerce=False)"
+    else:
+        assert (
+            repr(dtype)
+            == f"StringDType(na_object={dtype.na_object!r}, coerce=False)"
+        )
+
+
+def test_create_with_na(dtype):
+    if not hasattr(dtype, "na_object"):
+        pytest.skip("does not have an na object")
+    na_val = dtype.na_object
+    string_list = ["hello", na_val, "world"]
+    arr = np.array(string_list, dtype=dtype)
+    assert str(arr) == "[" + " ".join([repr(s) for s in string_list]) + "]"
+    assert arr[1] is dtype.na_object
+
+
+@pytest.mark.parametrize("i", list(range(5)))
+def test_set_replace_na(i):
+    # Test strings of various lengths can be set to NaN and then replaced.
+    s_empty = ""
+    s_short = "0123456789"
+    s_medium = "abcdefghijklmnopqrstuvwxyz"
+    s_long = "-=+" * 100
+    strings = [s_medium, s_empty, s_short, s_medium, s_long]
+    a = np.array(strings, StringDType(na_object=np.nan))
+    for s in [a[i], s_medium+s_short, s_short, s_empty, s_long]:
+        a[i] = np.nan
+        assert np.isnan(a[i])
+        a[i] = s
+        assert a[i] == s
+        assert_array_equal(a, strings[:i] + [s] + strings[i+1:])
+
+
+def test_null_roundtripping():
+    data = ["hello\0world", "ABC\0DEF\0\0"]
+    arr = np.array(data, dtype="T")
+    assert data[0] == arr[0]
+    assert data[1] == arr[1]
+
+
+def test_string_too_large_error():
+    arr = np.array(["a", "b", "c"], dtype=StringDType())
+    with pytest.raises(MemoryError):
+        arr * (2**63 - 2)
+
+
+@pytest.mark.parametrize(
+    "data",
+    [
+        ["abc", "def", "ghi"],
+        ["🤣", "📵", "😰"],
+        ["🚜", "🙃", "😾"],
+        ["😹", "🚠", "🚌"],
+    ],
+)
+def test_array_creation_utf8(dtype, data):
+    arr = np.array(data, dtype=dtype)
+    assert str(arr) == "[" + " ".join(["'" + str(d) + "'" for d in data]) + "]"
+    assert arr.dtype == dtype
+
+
+@pytest.mark.parametrize(
+    "data",
+    [
+        [1, 2, 3],
+        [b"abc", b"def", b"ghi"],
+        [object, object, object],
+    ],
+)
+def test_scalars_string_conversion(data, dtype):
+    if dtype.coerce:
+        assert_array_equal(
+            np.array(data, dtype=dtype),
+            np.array([str(d) for d in data], dtype=dtype),
+        )
+    else:
+        with pytest.raises(ValueError):
+            np.array(data, dtype=dtype)
+
+
+@pytest.mark.parametrize(
+    ("strings"),
+    [
+        ["this", "is", "an", "array"],
+        ["€", "", "😊"],
+        ["A¢☃€ 😊", " A☃€¢😊", "☃€😊 A¢", "😊☃A¢ €"],
+    ],
+)
+def test_self_casts(dtype, dtype2, strings):
+    if hasattr(dtype, "na_object"):
+        strings = strings + [dtype.na_object]
+    elif hasattr(dtype2, "na_object"):
+        strings = strings + [""]
+    arr = np.array(strings, dtype=dtype)
+    newarr = arr.astype(dtype2)
+
+    if hasattr(dtype, "na_object") and not hasattr(dtype2, "na_object"):
+        assert newarr[-1] == str(dtype.na_object)
+        with pytest.raises(TypeError):
+            arr.astype(dtype2, casting="safe")
+    elif hasattr(dtype, "na_object") and hasattr(dtype2, "na_object"):
+        assert newarr[-1] is dtype2.na_object
+        arr.astype(dtype2, casting="safe")
+    elif hasattr(dtype2, "na_object"):
+        assert newarr[-1] == ""
+        arr.astype(dtype2, casting="safe")
+    else:
+        arr.astype(dtype2, casting="safe")
+
+    if hasattr(dtype, "na_object") and hasattr(dtype2, "na_object"):
+        na1 = dtype.na_object
+        na2 = dtype2.na_object
+        if (na1 is not na2 and
+             # check for pd_NA first because bool(pd_NA) is an error
+             ((na1 is pd_NA or na2 is pd_NA) or
+              # the second check is a NaN check, spelled this way
+              # to avoid errors from math.isnan and np.isnan
+              (na1 != na2 and not (na1 != na1 and na2 != na2)))):
+            with pytest.raises(TypeError):
+                arr[:-1] == newarr[:-1]
+            return
+    assert_array_equal(arr[:-1], newarr[:-1])
+
+
+@pytest.mark.parametrize(
+    ("strings"),
+    [
+        ["this", "is", "an", "array"],
+        ["€", "", "😊"],
+        ["A¢☃€ 😊", " A☃€¢😊", "☃€😊 A¢", "😊☃A¢ €"],
+    ],
+)
+class TestStringLikeCasts:
+    def test_unicode_casts(self, dtype, strings):
+        arr = np.array(strings, dtype=np.str_).astype(dtype)
+        expected = np.array(strings, dtype=dtype)
+        assert_array_equal(arr, expected)
+
+        arr_as_U8 = expected.astype("U8")
+        assert_array_equal(arr_as_U8, np.array(strings, dtype="U8"))
+        assert_array_equal(arr_as_U8.astype(dtype), arr)
+        arr_as_U3 = expected.astype("U3")
+        assert_array_equal(arr_as_U3, np.array(strings, dtype="U3"))
+        assert_array_equal(
+            arr_as_U3.astype(dtype),
+            np.array([s[:3] for s in strings], dtype=dtype),
+        )
+
+    def test_void_casts(self, dtype, strings):
+        sarr = np.array(strings, dtype=dtype)
+        utf8_bytes = [s.encode("utf-8") for s in strings]
+        void_dtype = f"V{max([len(s) for s in utf8_bytes])}"
+        varr = np.array(utf8_bytes, dtype=void_dtype)
+        assert_array_equal(varr, sarr.astype(void_dtype))
+        assert_array_equal(varr.astype(dtype), sarr)
+
+    def test_bytes_casts(self, dtype, strings):
+        sarr = np.array(strings, dtype=dtype)
+        try:
+            utf8_bytes = [s.encode("ascii") for s in strings]
+            bytes_dtype = f"S{max([len(s) for s in utf8_bytes])}"
+            barr = np.array(utf8_bytes, dtype=bytes_dtype)
+            assert_array_equal(barr, sarr.astype(bytes_dtype))
+            assert_array_equal(barr.astype(dtype), sarr)
+        except UnicodeEncodeError:
+            with pytest.raises(UnicodeEncodeError):
+                sarr.astype("S20")
+
+
+def test_additional_unicode_cast(random_string_list, dtype):
+    arr = np.array(random_string_list, dtype=dtype)
+    # test that this short-circuits correctly
+    assert_array_equal(arr, arr.astype(arr.dtype))
+    # tests the casts via the comparison promoter
+    assert_array_equal(arr, arr.astype(random_string_list.dtype))
+
+
+def test_insert_scalar(dtype, string_list):
+    """Test that inserting a scalar works."""
+    arr = np.array(string_list, dtype=dtype)
+    scalar_instance = "what"
+    arr[1] = scalar_instance
+    assert_array_equal(
+        arr,
+        np.array(string_list[:1] + ["what"] + string_list[2:], dtype=dtype),
+    )
+
+
+comparison_operators = [
+    np.equal,
+    np.not_equal,
+    np.greater,
+    np.greater_equal,
+    np.less,
+    np.less_equal,
+]
+
+
+@pytest.mark.parametrize("op", comparison_operators)
+@pytest.mark.parametrize("o_dtype", [np.str_, object, StringDType()])
+def test_comparisons(string_list, dtype, op, o_dtype):
+    sarr = np.array(string_list, dtype=dtype)
+    oarr = np.array(string_list, dtype=o_dtype)
+
+    # test that comparison operators work
+    res = op(sarr, sarr)
+    ores = op(oarr, oarr)
+    # test that promotion works as well
+    orres = op(sarr, oarr)
+    olres = op(oarr, sarr)
+
+    assert_array_equal(res, ores)
+    assert_array_equal(res, orres)
+    assert_array_equal(res, olres)
+
+    # test we get the correct answer for unequal length strings
+    sarr2 = np.array([s + "2" for s in string_list], dtype=dtype)
+    oarr2 = np.array([s + "2" for s in string_list], dtype=o_dtype)
+
+    res = op(sarr, sarr2)
+    ores = op(oarr, oarr2)
+    olres = op(oarr, sarr2)
+    orres = op(sarr, oarr2)
+
+    assert_array_equal(res, ores)
+    assert_array_equal(res, olres)
+    assert_array_equal(res, orres)
+
+    res = op(sarr2, sarr)
+    ores = op(oarr2, oarr)
+    olres = op(oarr2, sarr)
+    orres = op(sarr2, oarr)
+
+    assert_array_equal(res, ores)
+    assert_array_equal(res, olres)
+    assert_array_equal(res, orres)
+
+
+def test_isnan(dtype, string_list):
+    if not hasattr(dtype, "na_object"):
+        pytest.skip("no na support")
+    sarr = np.array(string_list + [dtype.na_object], dtype=dtype)
+    is_nan = isinstance(dtype.na_object, float) and np.isnan(dtype.na_object)
+    bool_errors = 0
+    try:
+        bool(dtype.na_object)
+    except TypeError:
+        bool_errors = 1
+    if is_nan or bool_errors:
+        # isnan is only true when na_object is a NaN
+        assert_array_equal(
+            np.isnan(sarr),
+            np.array([0] * len(string_list) + [1], dtype=np.bool),
+        )
+    else:
+        assert not np.any(np.isnan(sarr))
+
+
+def test_pickle(dtype, string_list):
+    arr = np.array(string_list, dtype=dtype)
+
+    with tempfile.NamedTemporaryFile("wb", delete=False) as f:
+        pickle.dump([arr, dtype], f)
+
+    with open(f.name, "rb") as f:
+        res = pickle.load(f)
+
+    assert_array_equal(res[0], arr)
+    assert res[1] == dtype
+
+    os.remove(f.name)
+
+
+@pytest.mark.parametrize(
+    "strings",
+    [
+        ["left", "right", "leftovers", "righty", "up", "down"],
+        [
+            "left" * 10,
+            "right" * 10,
+            "leftovers" * 10,
+            "righty" * 10,
+            "up" * 10,
+        ],
+        ["🤣🤣", "🤣", "📵", "😰"],
+        ["🚜", "🙃", "😾"],
+        ["😹", "🚠", "🚌"],
+        ["A¢☃€ 😊", " A☃€¢😊", "☃€😊 A¢", "😊☃A¢ €"],
+    ],
+)
+def test_sort(dtype, strings):
+    """Test that sorting matches python's internal sorting."""
+
+    def test_sort(strings, arr_sorted):
+        arr = np.array(strings, dtype=dtype)
+        na_object = getattr(arr.dtype, "na_object", "")
+        if na_object is None and None in strings:
+            with pytest.raises(
+                ValueError,
+                match="Cannot compare null that is not a nan-like value",
+            ):
+                np.argsort(arr)
+            argsorted = None
+        elif na_object is pd_NA or na_object != '':
+            argsorted = None
+        else:
+            argsorted = np.argsort(arr)
+        np.random.default_rng().shuffle(arr)
+        if na_object is None and None in strings:
+            with pytest.raises(
+                ValueError,
+                match="Cannot compare null that is not a nan-like value",
+            ):
+                arr.sort()
+        else:
+            arr.sort()
+            assert np.array_equal(arr, arr_sorted, equal_nan=True)
+        if argsorted is not None:
+            assert np.array_equal(argsorted, np.argsort(strings))
+
+
+    # make a copy so we don't mutate the lists in the fixture
+    strings = strings.copy()
+    arr_sorted = np.array(sorted(strings), dtype=dtype)
+    test_sort(strings, arr_sorted)
+
+    if not hasattr(dtype, "na_object"):
+        return
+
+    # make sure NAs get sorted to the end of the array and string NAs get
+    # sorted like normal strings
+    strings.insert(0, dtype.na_object)
+    strings.insert(2, dtype.na_object)
+    # can't use append because doing that with NA converts
+    # the result to object dtype
+    if not isinstance(dtype.na_object, str):
+        arr_sorted = np.array(
+            arr_sorted.tolist() + [dtype.na_object, dtype.na_object],
+            dtype=dtype,
+        )
+    else:
+        arr_sorted = np.array(sorted(strings), dtype=dtype)
+
+    test_sort(strings, arr_sorted)
+
+
+@pytest.mark.parametrize(
+    "strings",
+    [
+        ["A¢☃€ 😊", " A☃€¢😊", "☃€😊 A¢", "😊☃A¢ €"],
+        ["A¢☃€ 😊", "", " ", " "],
+        ["", "a", "😸", "ááðfáíóåéë"],
+    ],
+)
+def test_nonzero(strings, na_object):
+    dtype = get_dtype(na_object)
+    arr = np.array(strings, dtype=dtype)
+    is_nonzero = np.array(
+        [i for i, item in enumerate(strings) if len(item) != 0])
+    assert_array_equal(arr.nonzero()[0], is_nonzero)
+
+    if na_object is not pd_NA and na_object == 'unset':
+        return
+
+    strings_with_na = np.array(strings + [na_object], dtype=dtype)
+    is_nan = np.isnan(np.array([dtype.na_object], dtype=dtype))[0]
+
+    if is_nan:
+        assert strings_with_na.nonzero()[0][-1] == 4
+    else:
+        assert strings_with_na.nonzero()[0][-1] == 3
+
+    # check that the casting to bool and nonzero give consistent results
+    assert_array_equal(strings_with_na[strings_with_na.nonzero()],
+                       strings_with_na[strings_with_na.astype(bool)])
+
+
+def test_where(string_list, na_object):
+    dtype = get_dtype(na_object)
+    a = np.array(string_list, dtype=dtype)
+    b = a[::-1]
+    res = np.where([True, False, True, False, True, False], a, b)
+    assert_array_equal(res, [a[0], b[1], a[2], b[3], a[4], b[5]])
+
+
+def test_fancy_indexing(string_list):
+    sarr = np.array(string_list, dtype="T")
+    assert_array_equal(sarr, sarr[np.arange(sarr.shape[0])])
+
+    inds = [
+        [True, True],
+        [0, 1],
+        ...,
+        np.array([0, 1], dtype='uint8'),
+    ]
+
+    lops = [
+        ['a'*25, 'b'*25],
+        ['', ''],
+        ['hello', 'world'],
+        ['hello', 'world'*25],
+    ]
+
+    # see gh-27003 and gh-27053
+    for ind in inds:
+        for lop in lops:
+            a = np.array(lop, dtype="T")
+            assert_array_equal(a[ind], a)
+            rop = ['d'*25, 'e'*25]
+            for b in [rop, np.array(rop, dtype="T")]:
+                a[ind] = b
+                assert_array_equal(a, b)
+                assert a[0] == 'd'*25
+
+
+def test_creation_functions():
+    assert_array_equal(np.zeros(3, dtype="T"), ["", "", ""])
+    assert_array_equal(np.empty(3, dtype="T"), ["", "", ""])
+
+    assert np.zeros(3, dtype="T")[0] == ""
+    assert np.empty(3, dtype="T")[0] == ""
+
+
+def test_concatenate(string_list):
+    sarr = np.array(string_list, dtype="T")
+    sarr_cat = np.array(string_list + string_list, dtype="T")
+
+    assert_array_equal(np.concatenate([sarr], axis=0), sarr)
+
+
+def test_resize_method(string_list):
+    sarr = np.array(string_list, dtype="T")
+    if IS_PYPY:
+        sarr.resize(len(string_list)+3, refcheck=False)
+    else:
+        sarr.resize(len(string_list)+3)
+    assert_array_equal(sarr, np.array(string_list + ['']*3,  dtype="T"))
+
+
+def test_create_with_copy_none(string_list):
+    arr = np.array(string_list, dtype=StringDType())
+    # create another stringdtype array with an arena that has a different
+    # in-memory layout than the first array
+    arr_rev = np.array(string_list[::-1], dtype=StringDType())
+
+    # this should create a copy and the resulting array
+    # shouldn't share an allocator or arena with arr_rev, despite
+    # explicitly passing arr_rev.dtype
+    arr_copy = np.array(arr, copy=None, dtype=arr_rev.dtype)
+    np.testing.assert_array_equal(arr, arr_copy)
+    assert arr_copy.base is None
+
+    with pytest.raises(ValueError, match="Unable to avoid copy"):
+        np.array(arr, copy=False, dtype=arr_rev.dtype)
+
+    # because we're using arr's dtype instance, the view is safe
+    arr_view = np.array(arr, copy=None, dtype=arr.dtype)
+    np.testing.assert_array_equal(arr, arr)
+    np.testing.assert_array_equal(arr_view[::-1], arr_rev)
+    assert arr_view is arr
+
+
+def test_astype_copy_false():
+    orig_dt = StringDType()
+    arr = np.array(["hello", "world"], dtype=StringDType())
+    assert not arr.astype(StringDType(coerce=False), copy=False).dtype.coerce
+
+    assert arr.astype(orig_dt, copy=False).dtype is orig_dt
+
+@pytest.mark.parametrize(
+    "strings",
+    [
+        ["left", "right", "leftovers", "righty", "up", "down"],
+        ["🤣🤣", "🤣", "📵", "😰"],
+        ["🚜", "🙃", "😾"],
+        ["😹", "🚠", "🚌"],
+        ["A¢☃€ 😊", " A☃€¢😊", "☃€😊 A¢", "😊☃A¢ €"],
+    ],
+)
+def test_argmax(strings):
+    """Test that argmax/argmin matches what python calculates."""
+    arr = np.array(strings, dtype="T")
+    assert np.argmax(arr) == strings.index(max(strings))
+    assert np.argmin(arr) == strings.index(min(strings))
+
+
+@pytest.mark.parametrize(
+    "arrfunc,expected",
+    [
+        [np.sort, None],
+        [np.nonzero, (np.array([], dtype=np.int_),)],
+        [np.argmax, 0],
+        [np.argmin, 0],
+    ],
+)
+def test_arrfuncs_zeros(arrfunc, expected):
+    arr = np.zeros(10, dtype="T")
+    result = arrfunc(arr)
+    if expected is None:
+        expected = arr
+    assert_array_equal(result, expected, strict=True)
+
+
+@pytest.mark.parametrize(
+    ("strings", "cast_answer", "any_answer", "all_answer"),
+    [
+        [["hello", "world"], [True, True], True, True],
+        [["", ""], [False, False], False, False],
+        [["hello", ""], [True, False], True, False],
+        [["", "world"], [False, True], True, False],
+    ],
+)
+def test_cast_to_bool(strings, cast_answer, any_answer, all_answer):
+    sarr = np.array(strings, dtype="T")
+    assert_array_equal(sarr.astype("bool"), cast_answer)
+
+    assert np.any(sarr) == any_answer
+    assert np.all(sarr) == all_answer
+
+
+@pytest.mark.parametrize(
+    ("strings", "cast_answer"),
+    [
+        [[True, True], ["True", "True"]],
+        [[False, False], ["False", "False"]],
+        [[True, False], ["True", "False"]],
+        [[False, True], ["False", "True"]],
+    ],
+)
+def test_cast_from_bool(strings, cast_answer):
+    barr = np.array(strings, dtype=bool)
+    assert_array_equal(barr.astype("T"), np.array(cast_answer, dtype="T"))
+
+
+@pytest.mark.parametrize("bitsize", [8, 16, 32, 64])
+@pytest.mark.parametrize("signed", [True, False])
+def test_sized_integer_casts(bitsize, signed):
+    idtype = f"int{bitsize}"
+    if signed:
+        inp = [-(2**p - 1) for p in reversed(range(bitsize - 1))]
+        inp += [2**p - 1 for p in range(1, bitsize - 1)]
+    else:
+        idtype = "u" + idtype
+        inp = [2**p - 1 for p in range(bitsize)]
+    ainp = np.array(inp, dtype=idtype)
+    assert_array_equal(ainp, ainp.astype("T").astype(idtype))
+
+    # safe casting works
+    ainp.astype("T", casting="safe")
+
+    with pytest.raises(TypeError):
+        ainp.astype("T").astype(idtype, casting="safe")
+
+    oob = [str(2**bitsize), str(-(2**bitsize))]
+    with pytest.raises(OverflowError):
+        np.array(oob, dtype="T").astype(idtype)
+
+    with pytest.raises(ValueError):
+        np.array(["1", np.nan, "3"],
+                 dtype=StringDType(na_object=np.nan)).astype(idtype)
+
+
+@pytest.mark.parametrize("typename", ["byte", "short", "int", "longlong"])
+@pytest.mark.parametrize("signed", ["", "u"])
+def test_unsized_integer_casts(typename, signed):
+    idtype = f"{signed}{typename}"
+
+    inp = [1, 2, 3, 4]
+    ainp = np.array(inp, dtype=idtype)
+    assert_array_equal(ainp, ainp.astype("T").astype(idtype))
+
+
+@pytest.mark.parametrize(
+    "typename",
+    [
+        pytest.param(
+            "longdouble",
+            marks=pytest.mark.xfail(
+                np.dtypes.LongDoubleDType() != np.dtypes.Float64DType(),
+                reason="numpy lacks an ld2a implementation",
+                strict=True,
+            ),
+        ),
+        "float64",
+        "float32",
+        "float16",
+    ],
+)
+def test_float_casts(typename):
+    inp = [1.1, 2.8, -3.2, 2.7e4]
+    ainp = np.array(inp, dtype=typename)
+    assert_array_equal(ainp, ainp.astype("T").astype(typename))
+
+    inp = [0.1]
+    sres = np.array(inp, dtype=typename).astype("T")
+    res = sres.astype(typename)
+    assert_array_equal(np.array(inp, dtype=typename), res)
+    assert sres[0] == "0.1"
+
+    if typename == "longdouble":
+        # let's not worry about platform-dependent rounding of longdouble
+        return
+
+    fi = np.finfo(typename)
+
+    inp = [1e-324, fi.smallest_subnormal, -1e-324, -fi.smallest_subnormal]
+    eres = [0, fi.smallest_subnormal, -0, -fi.smallest_subnormal]
+    res = np.array(inp, dtype=typename).astype("T").astype(typename)
+    assert_array_equal(eres, res)
+
+    inp = [2e308, fi.max, -2e308, fi.min]
+    eres = [np.inf, fi.max, -np.inf, fi.min]
+    res = np.array(inp, dtype=typename).astype("T").astype(typename)
+    assert_array_equal(eres, res)
+
+
+@pytest.mark.parametrize(
+    "typename",
+    [
+        "csingle",
+        "cdouble",
+        pytest.param(
+            "clongdouble",
+            marks=pytest.mark.xfail(
+                np.dtypes.CLongDoubleDType() != np.dtypes.Complex128DType(),
+                reason="numpy lacks an ld2a implementation",
+                strict=True,
+            ),
+        ),
+    ],
+)
+def test_cfloat_casts(typename):
+    inp = [1.1 + 1.1j, 2.8 + 2.8j, -3.2 - 3.2j, 2.7e4 + 2.7e4j]
+    ainp = np.array(inp, dtype=typename)
+    assert_array_equal(ainp, ainp.astype("T").astype(typename))
+
+    inp = [0.1 + 0.1j]
+    sres = np.array(inp, dtype=typename).astype("T")
+    res = sres.astype(typename)
+    assert_array_equal(np.array(inp, dtype=typename), res)
+    assert sres[0] == "(0.1+0.1j)"
+
+
+def test_take(string_list):
+    sarr = np.array(string_list, dtype="T")
+    res = sarr.take(np.arange(len(string_list)))
+    assert_array_equal(sarr, res)
+
+    # make sure it also works for out
+    out = np.empty(len(string_list), dtype="T")
+    out[0] = "hello"
+    res = sarr.take(np.arange(len(string_list)), out=out)
+    assert res is out
+    assert_array_equal(sarr, res)
+
+
+@pytest.mark.parametrize("use_out", [True, False])
+@pytest.mark.parametrize(
+    "ufunc_name,func",
+    [
+        ("min", min),
+        ("max", max),
+    ],
+)
+def test_ufuncs_minmax(string_list, ufunc_name, func, use_out):
+    """Test that the min/max ufuncs match Python builtin min/max behavior."""
+    arr = np.array(string_list, dtype="T")
+    uarr = np.array(string_list, dtype=str)
+    res = np.array(func(string_list), dtype="T")
+    assert_array_equal(getattr(arr, ufunc_name)(), res)
+
+    ufunc = getattr(np, ufunc_name + "imum")
+
+    if use_out:
+        res = ufunc(arr, arr, out=arr)
+    else:
+        res = ufunc(arr, arr)
+
+    assert_array_equal(uarr, res)
+    assert_array_equal(getattr(arr, ufunc_name)(), func(string_list))
+
+
+def test_max_regression():
+    arr = np.array(['y', 'y', 'z'], dtype="T")
+    assert arr.max() == 'z'
+
+
+@pytest.mark.parametrize("use_out", [True, False])
+@pytest.mark.parametrize(
+    "other_strings",
+    [
+        ["abc", "def" * 500, "ghi" * 16, "🤣" * 100, "📵", "😰"],
+        ["🚜", "🙃", "😾", "😹", "🚠", "🚌"],
+        ["🥦", "¨", "⨯", "∰ ", "⨌ ", "⎶ "],
+    ],
+)
+def test_ufunc_add(dtype, string_list, other_strings, use_out):
+    arr1 = np.array(string_list, dtype=dtype)
+    arr2 = np.array(other_strings, dtype=dtype)
+    result = np.array([a + b for a, b in zip(arr1, arr2)], dtype=dtype)
+
+    if use_out:
+        res = np.add(arr1, arr2, out=arr1)
+    else:
+        res = np.add(arr1, arr2)
+
+    assert_array_equal(res, result)
+
+    if not hasattr(dtype, "na_object"):
+        return
+
+    is_nan = isinstance(dtype.na_object, float) and np.isnan(dtype.na_object)
+    is_str = isinstance(dtype.na_object, str)
+    bool_errors = 0
+    try:
+        bool(dtype.na_object)
+    except TypeError:
+        bool_errors = 1
+
+    arr1 = np.array([dtype.na_object] + string_list, dtype=dtype)
+    arr2 = np.array(other_strings + [dtype.na_object], dtype=dtype)
+
+    if is_nan or bool_errors or is_str:
+        res = np.add(arr1, arr2)
+        assert_array_equal(res[1:-1], arr1[1:-1] + arr2[1:-1])
+        if not is_str:
+            assert res[0] is dtype.na_object and res[-1] is dtype.na_object
+        else:
+            assert res[0] == dtype.na_object + arr2[0]
+            assert res[-1] == arr1[-1] + dtype.na_object
+    else:
+        with pytest.raises(ValueError):
+            np.add(arr1, arr2)
+
+
+def test_ufunc_add_reduce(dtype):
+    values = ["a", "this is a long string", "c"]
+    arr = np.array(values, dtype=dtype)
+    out = np.empty((), dtype=dtype)
+
+    expected = np.array("".join(values), dtype=dtype)
+    assert_array_equal(np.add.reduce(arr), expected)
+
+    np.add.reduce(arr, out=out)
+    assert_array_equal(out, expected)
+
+
+def test_add_promoter(string_list):
+    arr = np.array(string_list, dtype=StringDType())
+    lresult = np.array(["hello" + s for s in string_list], dtype=StringDType())
+    rresult = np.array([s + "hello" for s in string_list], dtype=StringDType())
+
+    for op in ["hello", np.str_("hello"), np.array(["hello"])]:
+        assert_array_equal(op + arr, lresult)
+        assert_array_equal(arr + op, rresult)
+
+    # The promoter should be able to handle things if users pass `dtype=`
+    res = np.add("hello", string_list, dtype=StringDType)
+    assert res.dtype == StringDType()
+
+    # The promoter should not kick in if users override the input,
+    # which means arr is cast, this fails because of the unknown length.
+    with pytest.raises(TypeError, match="cannot cast dtype"):
+        np.add(arr, "add", signature=("U", "U", None), casting="unsafe")
+
+    # But it must simply reject the following:
+    with pytest.raises(TypeError, match=".*did not contain a loop"):
+        np.add(arr, "add", signature=(None, "U", None))
+
+    with pytest.raises(TypeError, match=".*did not contain a loop"):
+        np.add("a", "b", signature=("U", "U", StringDType))
+
+
+def test_add_no_legacy_promote_with_signature():
+    # Possibly misplaced, but useful to test with string DType.  We check that
+    # if there is clearly no loop found, a stray `dtype=` doesn't break things
+    # Regression test for the bad error in gh-26735
+    # (If legacy promotion is gone, this can be deleted...)
+    with pytest.raises(TypeError, match=".*did not contain a loop"):
+        np.add("3", 6, dtype=StringDType)
+
+
+def test_add_promoter_reduce():
+    # Exact TypeError could change, but ensure StringDtype doesn't match
+    with pytest.raises(TypeError, match="the resolved dtypes are not"):
+        np.add.reduce(np.array(["a", "b"], dtype="U"))
+
+    # On the other hand, using `dtype=T` in the *ufunc* should work.
+    np.add.reduce(np.array(["a", "b"], dtype="U"), dtype=np.dtypes.StringDType)
+
+
+def test_multiply_reduce():
+    # At the time of writing (NumPy 2.0) this is very limited (and rather
+    # ridiculous anyway).  But it works and actually makes some sense...
+    # (NumPy does not allow non-scalar initial values)
+    repeats = np.array([2, 3, 4])
+    val = "school-🚌"
+    res = np.multiply.reduce(repeats, initial=val, dtype=np.dtypes.StringDType)
+    assert res == val * np.prod(repeats)
+
+
+def test_multiply_two_string_raises():
+    arr = np.array(["hello", "world"], dtype="T")
+    with pytest.raises(np._core._exceptions._UFuncNoLoopError):
+        np.multiply(arr, arr)
+
+
+@pytest.mark.parametrize("use_out", [True, False])
+@pytest.mark.parametrize("other", [2, [2, 1, 3, 4, 1, 3]])
+@pytest.mark.parametrize(
+    "other_dtype",
+    [
+        None,
+        "int8",
+        "int16",
+        "int32",
+        "int64",
+        "uint8",
+        "uint16",
+        "uint32",
+        "uint64",
+        "short",
+        "int",
+        "intp",
+        "long",
+        "longlong",
+        "ushort",
+        "uint",
+        "uintp",
+        "ulong",
+        "ulonglong",
+    ],
+)
+def test_ufunc_multiply(dtype, string_list, other, other_dtype, use_out):
+    """Test the two-argument ufuncs match python builtin behavior."""
+    arr = np.array(string_list, dtype=dtype)
+    if other_dtype is not None:
+        other_dtype = np.dtype(other_dtype)
+    try:
+        len(other)
+        result = [s * o for s, o in zip(string_list, other)]
+        other = np.array(other)
+        if other_dtype is not None:
+            other = other.astype(other_dtype)
+    except TypeError:
+        if other_dtype is not None:
+            other = other_dtype.type(other)
+        result = [s * other for s in string_list]
+
+    if use_out:
+        arr_cache = arr.copy()
+        lres = np.multiply(arr, other, out=arr)
+        assert_array_equal(lres, result)
+        arr[:] = arr_cache
+        assert lres is arr
+        arr *= other
+        assert_array_equal(arr, result)
+        arr[:] = arr_cache
+        rres = np.multiply(other, arr, out=arr)
+        assert rres is arr
+        assert_array_equal(rres, result)
+    else:
+        lres = arr * other
+        assert_array_equal(lres, result)
+        rres = other * arr
+        assert_array_equal(rres, result)
+
+    if not hasattr(dtype, "na_object"):
+        return
+
+    is_nan = np.isnan(np.array([dtype.na_object], dtype=dtype))[0]
+    is_str = isinstance(dtype.na_object, str)
+    bool_errors = 0
+    try:
+        bool(dtype.na_object)
+    except TypeError:
+        bool_errors = 1
+
+    arr = np.array(string_list + [dtype.na_object], dtype=dtype)
+
+    try:
+        len(other)
+        other = np.append(other, 3)
+        if other_dtype is not None:
+            other = other.astype(other_dtype)
+    except TypeError:
+        pass
+
+    if is_nan or bool_errors or is_str:
+        for res in [arr * other, other * arr]:
+            assert_array_equal(res[:-1], result)
+            if not is_str:
+                assert res[-1] is dtype.na_object
+            else:
+                try:
+                    assert res[-1] == dtype.na_object * other[-1]
+                except (IndexError, TypeError):
+                    assert res[-1] == dtype.na_object * other
+    else:
+        with pytest.raises(TypeError):
+            arr * other
+        with pytest.raises(TypeError):
+            other * arr
+
+
+def test_findlike_promoters():
+    r = "Wally"
+    l = "Where's Wally?"
+    s = np.int32(3)
+    e = np.int8(13)
+    for dtypes in [("T", "U"), ("U", "T")]:
+        for function, answer in [
+            (np.strings.index, 8),
+            (np.strings.endswith, True),
+        ]:
+            assert answer == function(
+                np.array(l, dtype=dtypes[0]), np.array(r, dtype=dtypes[1]), s, e
+            )
+
+
+def test_strip_promoter():
+    arg = ["Hello!!!!", "Hello??!!"]
+    strip_char = "!"
+    answer = ["Hello", "Hello??"]
+    for dtypes in [("T", "U"), ("U", "T")]:
+        result = np.strings.strip(
+            np.array(arg, dtype=dtypes[0]),
+            np.array(strip_char, dtype=dtypes[1])
+        )
+        assert_array_equal(result, answer)
+        assert result.dtype.char == "T"
+
+
+def test_replace_promoter():
+    arg = ["Hello, planet!", "planet, Hello!"]
+    old = "planet"
+    new = "world"
+    answer = ["Hello, world!", "world, Hello!"]
+    for dtypes in itertools.product("TU", repeat=3):
+        if dtypes == ("U", "U", "U"):
+            continue
+        answer_arr = np.strings.replace(
+            np.array(arg, dtype=dtypes[0]),
+            np.array(old, dtype=dtypes[1]),
+            np.array(new, dtype=dtypes[2]),
+        )
+        assert_array_equal(answer_arr, answer)
+        assert answer_arr.dtype.char == "T"
+
+
+def test_center_promoter():
+    arg = ["Hello", "planet!"]
+    fillchar = "/"
+    for dtypes in [("T", "U"), ("U", "T")]:
+        answer = np.strings.center(
+            np.array(arg, dtype=dtypes[0]), 9, np.array(fillchar, dtype=dtypes[1])
+        )
+        assert_array_equal(answer, ["//Hello//", "/planet!/"])
+        assert answer.dtype.char == "T"
+
+
+DATETIME_INPUT = [
+    np.datetime64("1923-04-14T12:43:12"),
+    np.datetime64("1994-06-21T14:43:15"),
+    np.datetime64("2001-10-15T04:10:32"),
+    np.datetime64("NaT"),
+    np.datetime64("1995-11-25T16:02:16"),
+    np.datetime64("2005-01-04T03:14:12"),
+    np.datetime64("2041-12-03T14:05:03"),
+]
+
+
+TIMEDELTA_INPUT = [
+    np.timedelta64(12358, "s"),
+    np.timedelta64(23, "s"),
+    np.timedelta64(74, "s"),
+    np.timedelta64("NaT"),
+    np.timedelta64(23, "s"),
+    np.timedelta64(73, "s"),
+    np.timedelta64(7, "s"),
+]
+
+
+@pytest.mark.parametrize(
+    "input_data, input_dtype",
+    [
+        (DATETIME_INPUT, "M8[s]"),
+        (TIMEDELTA_INPUT, "m8[s]")
+    ]
+)
+def test_datetime_timedelta_cast(dtype, input_data, input_dtype):
+
+    a = np.array(input_data, dtype=input_dtype)
+
+    has_na = hasattr(dtype, "na_object")
+    is_str = isinstance(getattr(dtype, "na_object", None), str)
+
+    if not has_na or is_str:
+        a = np.delete(a, 3)
+
+    sa = a.astype(dtype)
+    ra = sa.astype(a.dtype)
+
+    if has_na and not is_str:
+        assert sa[3] is dtype.na_object
+        assert np.isnat(ra[3])
+
+    assert_array_equal(a, ra)
+
+    if has_na and not is_str:
+        # don't worry about comparing how NaT is converted
+        sa = np.delete(sa, 3)
+        a = np.delete(a, 3)
+
+    if input_dtype.startswith("M"):
+        assert_array_equal(sa, a.astype("U"))
+    else:
+        # The timedelta to unicode cast produces strings
+        # that aren't round-trippable and we don't want to
+        # reproduce that behavior in stringdtype
+        assert_array_equal(sa, a.astype("int64").astype("U"))
+
+
+def test_nat_casts():
+    s = 'nat'
+    all_nats = itertools.product(*zip(s.upper(), s.lower()))
+    all_nats = list(map(''.join, all_nats))
+    NaT_dt = np.datetime64('NaT')
+    NaT_td = np.timedelta64('NaT')
+    for na_object in [np._NoValue, None, np.nan, 'nat', '']:
+        # numpy treats empty string and all case combinations of 'nat' as NaT
+        dtype = StringDType(na_object=na_object)
+        arr = np.array([''] + all_nats, dtype=dtype)
+        dt_array = arr.astype('M8[s]')
+        td_array = arr.astype('m8[s]')
+        assert_array_equal(dt_array, NaT_dt)
+        assert_array_equal(td_array, NaT_td)
+
+        if na_object is np._NoValue:
+            output_object = 'NaT'
+        else:
+            output_object = na_object
+
+        for arr in [dt_array, td_array]:
+            assert_array_equal(
+                arr.astype(dtype),
+                np.array([output_object]*arr.size, dtype=dtype))
+
+
+def test_nat_conversion():
+    for nat in [np.datetime64("NaT", "s"), np.timedelta64("NaT", "s")]:
+        with pytest.raises(ValueError, match="string coercion is disabled"):
+            np.array(["a", nat], dtype=StringDType(coerce=False))
+
+
+def test_growing_strings(dtype):
+    # growing a string leads to a heap allocation, this tests to make sure
+    # we do that bookkeeping correctly for all possible starting cases
+    data = [
+        "hello",  # a short string
+        "abcdefghijklmnopqestuvwxyz",  # a medium heap-allocated string
+        "hello" * 200,  # a long heap-allocated string
+    ]
+
+    arr = np.array(data, dtype=dtype)
+    uarr = np.array(data, dtype=str)
+
+    for _ in range(5):
+        arr = arr + arr
+        uarr = uarr + uarr
+
+    assert_array_equal(arr, uarr)
+
+
+@pytest.mark.skipif(IS_WASM, reason="no threading support in wasm")
+def test_threaded_access_and_mutation(dtype, random_string_list):
+    # this test uses an RNG and may crash or cause deadlocks if there is a
+    # threading bug
+    rng = np.random.default_rng(0x4D3D3D3)
+
+    def func(arr):
+        rnd = rng.random()
+        # either write to random locations in the array, compute a ufunc, or
+        # re-initialize the array
+        if rnd < 0.25:
+            num = np.random.randint(0, arr.size)
+            arr[num] = arr[num] + "hello"
+        elif rnd < 0.5:
+            if rnd < 0.375:
+                np.add(arr, arr)
+            else:
+                np.add(arr, arr, out=arr)
+        elif rnd < 0.75:
+            if rnd < 0.875:
+                np.multiply(arr, np.int64(2))
+            else:
+                np.multiply(arr, np.int64(2), out=arr)
+        else:
+            arr[:] = random_string_list
+
+    with concurrent.futures.ThreadPoolExecutor(max_workers=8) as tpe:
+        arr = np.array(random_string_list, dtype=dtype)
+        futures = [tpe.submit(func, arr) for _ in range(500)]
+
+        for f in futures:
+            f.result()
+
+
+UFUNC_TEST_DATA = [
+    "hello" * 10,
+    "Ae¢☃€ 😊" * 20,
+    "entry\nwith\nnewlines",
+    "entry\twith\ttabs",
+]
+
+
+@pytest.fixture
+def string_array(dtype):
+    return np.array(UFUNC_TEST_DATA, dtype=dtype)
+
+
+@pytest.fixture
+def unicode_array():
+    return np.array(UFUNC_TEST_DATA, dtype=np.str_)
+
+
+NAN_PRESERVING_FUNCTIONS = [
+    "capitalize",
+    "expandtabs",
+    "lower",
+    "lstrip",
+    "rstrip",
+    "splitlines",
+    "strip",
+    "swapcase",
+    "title",
+    "upper",
+]
+
+BOOL_OUTPUT_FUNCTIONS = [
+    "isalnum",
+    "isalpha",
+    "isdigit",
+    "islower",
+    "isspace",
+    "istitle",
+    "isupper",
+    "isnumeric",
+    "isdecimal",
+]
+
+UNARY_FUNCTIONS = [
+    "str_len",
+    "capitalize",
+    "expandtabs",
+    "isalnum",
+    "isalpha",
+    "isdigit",
+    "islower",
+    "isspace",
+    "istitle",
+    "isupper",
+    "lower",
+    "lstrip",
+    "rstrip",
+    "splitlines",
+    "strip",
+    "swapcase",
+    "title",
+    "upper",
+    "isnumeric",
+    "isdecimal",
+    "isalnum",
+    "islower",
+    "istitle",
+    "isupper",
+]
+
+UNIMPLEMENTED_VEC_STRING_FUNCTIONS = [
+    "capitalize",
+    "expandtabs",
+    "lower",
+    "splitlines",
+    "swapcase",
+    "title",
+    "upper",
+]
+
+ONLY_IN_NP_CHAR = [
+    "join",
+    "split",
+    "rsplit",
+    "splitlines"
+]
+
+
+@pytest.mark.parametrize("function_name", UNARY_FUNCTIONS)
+def test_unary(string_array, unicode_array, function_name):
+    if function_name in ONLY_IN_NP_CHAR:
+        func = getattr(np.char, function_name)
+    else:
+        func = getattr(np.strings, function_name)
+    dtype = string_array.dtype
+    sres = func(string_array)
+    ures = func(unicode_array)
+    if sres.dtype == StringDType():
+        ures = ures.astype(StringDType())
+    assert_array_equal(sres, ures)
+
+    if not hasattr(dtype, "na_object"):
+        return
+
+    is_nan = np.isnan(np.array([dtype.na_object], dtype=dtype))[0]
+    is_str = isinstance(dtype.na_object, str)
+    na_arr = np.insert(string_array, 0, dtype.na_object)
+
+    if function_name in UNIMPLEMENTED_VEC_STRING_FUNCTIONS:
+        if not is_str:
+            # to avoid these errors we'd need to add NA support to _vec_string
+            with pytest.raises((ValueError, TypeError)):
+                func(na_arr)
+        else:
+            if function_name == "splitlines":
+                assert func(na_arr)[0] == func(dtype.na_object)[()]
+            else:
+                assert func(na_arr)[0] == func(dtype.na_object)
+        return
+    if function_name == "str_len" and not is_str:
+        # str_len always errors for any non-string null, even NA ones because
+        # it has an integer result
+        with pytest.raises(ValueError):
+            func(na_arr)
+        return
+    if function_name in BOOL_OUTPUT_FUNCTIONS:
+        if is_nan:
+            assert func(na_arr)[0] is np.False_
+        elif is_str:
+            assert func(na_arr)[0] == func(dtype.na_object)
+        else:
+            with pytest.raises(ValueError):
+                func(na_arr)
+        return
+    if not (is_nan or is_str):
+        with pytest.raises(ValueError):
+            func(na_arr)
+        return
+    res = func(na_arr)
+    if is_nan and function_name in NAN_PRESERVING_FUNCTIONS:
+        assert res[0] is dtype.na_object
+    elif is_str:
+        assert res[0] == func(dtype.na_object)
+
+
+unicode_bug_fail = pytest.mark.xfail(
+    reason="unicode output width is buggy", strict=True
+)
+
+# None means that the argument is a string array
+BINARY_FUNCTIONS = [
+    ("add", (None, None)),
+    ("multiply", (None, 2)),
+    ("mod", ("format: %s", None)),
+    ("center", (None, 25)),
+    ("count", (None, "A")),
+    ("encode", (None, "UTF-8")),
+    ("endswith", (None, "lo")),
+    ("find", (None, "A")),
+    ("index", (None, "e")),
+    ("join", ("-", None)),
+    ("ljust", (None, 12)),
+    ("lstrip", (None, "A")),
+    ("partition", (None, "A")),
+    ("replace", (None, "A", "B")),
+    ("rfind", (None, "A")),
+    ("rindex", (None, "e")),
+    ("rjust", (None, 12)),
+    ("rsplit", (None, "A")),
+    ("rstrip", (None, "A")),
+    ("rpartition", (None, "A")),
+    ("split", (None, "A")),
+    ("strip", (None, "A")),
+    ("startswith", (None, "A")),
+    ("zfill", (None, 12)),
+]
+
+PASSES_THROUGH_NAN_NULLS = [
+    "add",
+    "center",
+    "ljust",
+    "multiply",
+    "replace",
+    "rjust",
+    "strip",
+    "lstrip",
+    "rstrip",
+    "replace"
+    "zfill",
+]
+
+NULLS_ARE_FALSEY = [
+    "startswith",
+    "endswith",
+]
+
+NULLS_ALWAYS_ERROR = [
+    "count",
+    "find",
+    "rfind",
+]
+
+SUPPORTS_NULLS = (
+    PASSES_THROUGH_NAN_NULLS +
+    NULLS_ARE_FALSEY +
+    NULLS_ALWAYS_ERROR
+)
+
+
+def call_func(func, args, array, sanitize=True):
+    if args == (None, None):
+        return func(array, array)
+    if args[0] is None:
+        if sanitize:
+            san_args = tuple(
+                np.array(arg, dtype=array.dtype) if isinstance(arg, str) else
+                arg for arg in args[1:]
+            )
+        else:
+            san_args = args[1:]
+        return func(array, *san_args)
+    if args[1] is None:
+        return func(args[0], array)
+    # shouldn't ever happen
+    assert 0
+
+
+@pytest.mark.parametrize("function_name, args", BINARY_FUNCTIONS)
+def test_binary(string_array, unicode_array, function_name, args):
+    if function_name in ONLY_IN_NP_CHAR:
+        func = getattr(np.char, function_name)
+    else:
+        func = getattr(np.strings, function_name)
+    sres = call_func(func, args, string_array)
+    ures = call_func(func, args, unicode_array, sanitize=False)
+    if not isinstance(sres, tuple) and sres.dtype == StringDType():
+        ures = ures.astype(StringDType())
+    assert_array_equal(sres, ures)
+
+    dtype = string_array.dtype
+    if function_name not in SUPPORTS_NULLS or not hasattr(dtype, "na_object"):
+        return
+
+    na_arr = np.insert(string_array, 0, dtype.na_object)
+    is_nan = np.isnan(np.array([dtype.na_object], dtype=dtype))[0]
+    is_str = isinstance(dtype.na_object, str)
+    should_error = not (is_nan or is_str)
+
+    if (
+        (function_name in NULLS_ALWAYS_ERROR and not is_str)
+        or (function_name in PASSES_THROUGH_NAN_NULLS and should_error)
+        or (function_name in NULLS_ARE_FALSEY and should_error)
+    ):
+        with pytest.raises((ValueError, TypeError)):
+            call_func(func, args, na_arr)
+        return
+
+    res = call_func(func, args, na_arr)
+
+    if is_str:
+        assert res[0] == call_func(func, args, na_arr[:1])
+    elif function_name in NULLS_ARE_FALSEY:
+        assert res[0] is np.False_
+    elif function_name in PASSES_THROUGH_NAN_NULLS:
+        assert res[0] is dtype.na_object
+    else:
+        # shouldn't ever get here
+        assert 0
+
+
+@pytest.mark.parametrize("function, expected", [
+    (np.strings.find, [[2, -1], [1, -1]]),
+    (np.strings.startswith, [[False, False], [True, False]])])
+@pytest.mark.parametrize("start, stop", [
+    (1, 4),
+    (np.int8(1), np.int8(4)),
+    (np.array([1, 1], dtype='u2'), np.array([4, 4], dtype='u2'))])
+def test_non_default_start_stop(function, start, stop, expected):
+    a = np.array([["--🐍--", "--🦜--"],
+                  ["-🐍---", "-🦜---"]], "T")
+    indx = function(a, "🐍", start, stop)
+    assert_array_equal(indx, expected)
+
+
+@pytest.mark.parametrize("count", [2, np.int8(2), np.array([2, 2], 'u2')])
+def test_replace_non_default_repeat(count):
+    a = np.array(["🐍--", "🦜-🦜-"], "T")
+    result = np.strings.replace(a, "🦜-", "🦜†", count)
+    assert_array_equal(result, np.array(["🐍--", "🦜†🦜†"], "T"))
+
+
+def test_strip_ljust_rjust_consistency(string_array, unicode_array):
+    rjs = np.char.rjust(string_array, 1000)
+    rju = np.char.rjust(unicode_array, 1000)
+
+    ljs = np.char.ljust(string_array, 1000)
+    lju = np.char.ljust(unicode_array, 1000)
+
+    assert_array_equal(
+        np.char.lstrip(rjs),
+        np.char.lstrip(rju).astype(StringDType()),
+    )
+
+    assert_array_equal(
+        np.char.rstrip(ljs),
+        np.char.rstrip(lju).astype(StringDType()),
+    )
+
+    assert_array_equal(
+        np.char.strip(ljs),
+        np.char.strip(lju).astype(StringDType()),
+    )
+
+    assert_array_equal(
+        np.char.strip(rjs),
+        np.char.strip(rju).astype(StringDType()),
+    )
+
+
+def test_unset_na_coercion():
+    # a dtype instance with an unset na object is compatible
+    # with a dtype that has one set
+
+    # this test uses the "add" and "equal" ufunc but all ufuncs that
+    # accept more than one string argument and produce a string should
+    # behave this way
+    # TODO: generalize to more ufuncs
+    inp = ["hello", "world"]
+    arr = np.array(inp, dtype=StringDType(na_object=None))
+    for op_dtype in [None, StringDType(), StringDType(coerce=False),
+                     StringDType(na_object=None)]:
+        if op_dtype is None:
+            op = "2"
+        else:
+            op = np.array("2", dtype=op_dtype)
+        res = arr + op
+        assert_array_equal(res, ["hello2", "world2"])
+
+    # dtype instances with distinct explicitly set NA objects are incompatible
+    for op_dtype in [StringDType(na_object=pd_NA), StringDType(na_object="")]:
+        op = np.array("2", dtype=op_dtype)
+        with pytest.raises(TypeError):
+            arr + op
+
+    # comparisons only consider the na_object
+    for op_dtype in [None, StringDType(), StringDType(coerce=True),
+                     StringDType(na_object=None)]:
+        if op_dtype is None:
+            op = inp
+        else:
+            op = np.array(inp, dtype=op_dtype)
+        assert_array_equal(arr, op)
+
+    for op_dtype in [StringDType(na_object=pd_NA),
+                     StringDType(na_object=np.nan)]:
+        op = np.array(inp, dtype=op_dtype)
+        with pytest.raises(TypeError):
+            arr == op
+
+
+def test_repeat(string_array):
+    res = string_array.repeat(1000)
+    # Create an empty array with expanded dimension, and fill it.  Then,
+    # reshape it to the expected result.
+    expected = np.empty_like(string_array, shape=string_array.shape + (1000,))
+    expected[...] = string_array[:, np.newaxis]
+    expected = expected.reshape(-1)
+
+    assert_array_equal(res, expected, strict=True)
+
+
+@pytest.mark.parametrize("tile", [1, 6, (2, 5)])
+def test_accumulation(string_array, tile):
+    """Accumulation is odd for StringDType but tests dtypes with references.
+    """
+    # Fill with mostly empty strings to not create absurdly big strings
+    arr = np.zeros_like(string_array, shape=(100,))
+    arr[:len(string_array)] = string_array
+    arr[-len(string_array):] = string_array
+
+    # Bloat size a bit (get above thresholds and test >1 ndim).
+    arr = np.tile(string_array, tile)
+
+    res = np.add.accumulate(arr, axis=0)
+    res_obj = np.add.accumulate(arr.astype(object), axis=0)
+    assert_array_equal(res, res_obj.astype(arr.dtype), strict=True)
+
+    if arr.ndim > 1:
+        res = np.add.accumulate(arr, axis=-1)
+        res_obj = np.add.accumulate(arr.astype(object), axis=-1)
+
+        assert_array_equal(res, res_obj.astype(arr.dtype), strict=True)
+
+
+class TestImplementation:
+    """Check that strings are stored in the arena when possible.
+
+    This tests implementation details, so should be adjusted if
+    the implementation changes.
+    """
+
+    @classmethod
+    def setup_class(self):
+        self.MISSING = 0x80
+        self.INITIALIZED = 0x40
+        self.OUTSIDE_ARENA = 0x20
+        self.LONG = 0x10
+        self.dtype = StringDType(na_object=np.nan)
+        self.sizeofstr = self.dtype.itemsize
+        sp = self.dtype.itemsize // 2  # pointer size = sizeof(size_t)
+        # Below, size is not strictly correct, since it really uses
+        # 7 (or 3) bytes, but good enough for the tests here.
+        self.view_dtype = np.dtype([
+            ('offset', f'u{sp}'),
+            ('size', f'u{sp // 2}'),
+            ('xsiz', f'V{sp // 2 - 1}'),
+            ('size_and_flags', 'u1'),
+        ] if sys.byteorder == 'little' else [
+            ('size_and_flags', 'u1'),
+            ('xsiz', f'V{sp // 2 - 1}'),
+            ('size', f'u{sp // 2}'),
+            ('offset', f'u{sp}'),
+        ])
+        self.s_empty = ""
+        self.s_short = "01234"
+        self.s_medium = "abcdefghijklmnopqrstuvwxyz"
+        self.s_long = "-=+" * 100
+        self.a = np.array(
+            [self.s_empty, self.s_short, self.s_medium, self.s_long],
+            self.dtype)
+
+    def get_view(self, a):
+        # Cannot view a StringDType as anything else directly, since
+        # it has references. So, we use a stride trick hack.
+        from numpy.lib._stride_tricks_impl import DummyArray
+        interface = dict(a.__array_interface__)
+        interface['descr'] = self.view_dtype.descr
+        interface['typestr'] = self.view_dtype.str
+        return np.asarray(DummyArray(interface, base=a))
+
+    def get_flags(self, a):
+        return self.get_view(a)['size_and_flags'] & 0xf0
+
+    def is_short(self, a):
+        return self.get_flags(a) == self.INITIALIZED | self.OUTSIDE_ARENA
+
+    def is_on_heap(self, a):
+        return self.get_flags(a) == (self.INITIALIZED
+                                     | self.OUTSIDE_ARENA
+                                     | self.LONG)
+
+    def is_missing(self, a):
+        return self.get_flags(a) & self.MISSING == self.MISSING
+
+    def in_arena(self, a):
+        return (self.get_flags(a) & (self.INITIALIZED | self.OUTSIDE_ARENA)
+                == self.INITIALIZED)
+
+    def test_setup(self):
+        is_short = self.is_short(self.a)
+        length = np.strings.str_len(self.a)
+        assert_array_equal(is_short, (length > 0) & (length <= 15))
+        assert_array_equal(self.in_arena(self.a), [False, False, True, True])
+        assert_array_equal(self.is_on_heap(self.a), False)
+        assert_array_equal(self.is_missing(self.a), False)
+        view = self.get_view(self.a)
+        sizes = np.where(is_short, view['size_and_flags'] & 0xf,
+                         view['size'])
+        assert_array_equal(sizes, np.strings.str_len(self.a))
+        assert_array_equal(view['xsiz'][2:],
+                           np.void(b'\x00' * (self.sizeofstr // 4 - 1)))
+        # Check that the medium string uses only 1 byte for its length
+        # in the arena, while the long string takes 8 (or 4).
+        offsets = view['offset']
+        assert offsets[2] == 1
+        assert offsets[3] == 1 + len(self.s_medium) + self.sizeofstr // 2
+
+    def test_empty(self):
+        e = np.empty((3,), self.dtype)
+        assert_array_equal(self.get_flags(e), 0)
+        assert_array_equal(e, "")
+
+    def test_zeros(self):
+        z = np.zeros((2,), self.dtype)
+        assert_array_equal(self.get_flags(z), 0)
+        assert_array_equal(z, "")
+
+    def test_copy(self):
+        c = self.a.copy()
+        assert_array_equal(self.get_flags(c), self.get_flags(self.a))
+        assert_array_equal(c, self.a)
+        offsets = self.get_view(c)['offset']
+        assert offsets[2] == 1
+        assert offsets[3] == 1 + len(self.s_medium) + self.sizeofstr // 2
+
+    def test_arena_use_with_setting(self):
+        c = np.zeros_like(self.a)
+        assert_array_equal(self.get_flags(c), 0)
+        c[:] = self.a
+        assert_array_equal(self.get_flags(c), self.get_flags(self.a))
+        assert_array_equal(c, self.a)
+
+    def test_arena_reuse_with_setting(self):
+        c = self.a.copy()
+        c[:] = self.a
+        assert_array_equal(self.get_flags(c), self.get_flags(self.a))
+        assert_array_equal(c, self.a)
+
+    def test_arena_reuse_after_missing(self):
+        c = self.a.copy()
+        c[:] = np.nan
+        assert np.all(self.is_missing(c))
+        # Replacing with the original strings, the arena should be reused.
+        c[:] = self.a
+        assert_array_equal(self.get_flags(c), self.get_flags(self.a))
+        assert_array_equal(c, self.a)
+
+    def test_arena_reuse_after_empty(self):
+        c = self.a.copy()
+        c[:] = ""
+        assert_array_equal(c, "")
+        # Replacing with the original strings, the arena should be reused.
+        c[:] = self.a
+        assert_array_equal(self.get_flags(c), self.get_flags(self.a))
+        assert_array_equal(c, self.a)
+
+    def test_arena_reuse_for_shorter(self):
+        c = self.a.copy()
+        # A string slightly shorter than the shortest in the arena
+        # should be used for all strings in the arena.
+        c[:] = self.s_medium[:-1]
+        assert_array_equal(c, self.s_medium[:-1])
+        # first empty string in original was never initialized, so
+        # filling it in now leaves it initialized inside the arena.
+        # second string started as a short string so it can never live
+        # in the arena.
+        in_arena = np.array([True, False, True, True])
+        assert_array_equal(self.in_arena(c), in_arena)
+        # But when a short string is replaced, it will go on the heap.
+        assert_array_equal(self.is_short(c), False)
+        assert_array_equal(self.is_on_heap(c), ~in_arena)
+        # We can put the originals back, and they'll still fit,
+        # and short strings are back as short strings
+        c[:] = self.a
+        assert_array_equal(c, self.a)
+        assert_array_equal(self.in_arena(c), in_arena)
+        assert_array_equal(self.is_short(c), self.is_short(self.a))
+        assert_array_equal(self.is_on_heap(c), False)
+
+    def test_arena_reuse_if_possible(self):
+        c = self.a.copy()
+        # A slightly longer string will not fit in the arena for
+        # the medium string, but will fit for the longer one.
+        c[:] = self.s_medium + "±"
+        assert_array_equal(c, self.s_medium + "±")
+        in_arena_exp = np.strings.str_len(self.a) >= len(self.s_medium) + 1
+        # first entry started uninitialized and empty, so filling it leaves
+        # it in the arena
+        in_arena_exp[0] = True
+        assert not np.all(in_arena_exp == self.in_arena(self.a))
+        assert_array_equal(self.in_arena(c), in_arena_exp)
+        assert_array_equal(self.is_short(c), False)
+        assert_array_equal(self.is_on_heap(c), ~in_arena_exp)
+        # And once outside arena, it stays outside, since offset is lost.
+        # But short strings are used again.
+        c[:] = self.a
+        is_short_exp = self.is_short(self.a)
+        assert_array_equal(c, self.a)
+        assert_array_equal(self.in_arena(c), in_arena_exp)
+        assert_array_equal(self.is_short(c), is_short_exp)
+        assert_array_equal(self.is_on_heap(c), ~in_arena_exp & ~is_short_exp)
+
+    def test_arena_no_reuse_after_short(self):
+        c = self.a.copy()
+        # If we replace a string with a short string, it cannot
+        # go into the arena after because the offset is lost.
+        c[:] = self.s_short
+        assert_array_equal(c, self.s_short)
+        assert_array_equal(self.in_arena(c), False)
+        c[:] = self.a
+        assert_array_equal(c, self.a)
+        assert_array_equal(self.in_arena(c), False)
+        assert_array_equal(self.is_on_heap(c), self.in_arena(self.a))

mantis_evalkit/lib/python3.10/site-packages/numpy/_core/tests/test_strings.py

@@ -0,0 +1,1287 @@
+import sys
+import pytest
+
+import operator
+import numpy as np
+
+from numpy.testing import assert_array_equal, assert_raises, IS_PYPY
+from numpy.testing._private.utils import requires_memory
+
+COMPARISONS = [
+    (operator.eq, np.equal, "=="),
+    (operator.ne, np.not_equal, "!="),
+    (operator.lt, np.less, "<"),
+    (operator.le, np.less_equal, "<="),
+    (operator.gt, np.greater, ">"),
+    (operator.ge, np.greater_equal, ">="),
+]
+
+MAX = np.iinfo(np.int64).max
+
+IS_PYPY_LT_7_3_16 = IS_PYPY and sys.implementation.version < (7, 3, 16)
+
+@pytest.mark.parametrize(["op", "ufunc", "sym"], COMPARISONS)
+def test_mixed_string_comparison_ufuncs_fail(op, ufunc, sym):
+    arr_string = np.array(["a", "b"], dtype="S")
+    arr_unicode = np.array(["a", "c"], dtype="U")
+
+    with pytest.raises(TypeError, match="did not contain a loop"):
+        ufunc(arr_string, arr_unicode)
+
+    with pytest.raises(TypeError, match="did not contain a loop"):
+        ufunc(arr_unicode, arr_string)
+
+@pytest.mark.parametrize(["op", "ufunc", "sym"], COMPARISONS)
+def test_mixed_string_comparisons_ufuncs_with_cast(op, ufunc, sym):
+    arr_string = np.array(["a", "b"], dtype="S")
+    arr_unicode = np.array(["a", "c"], dtype="U")
+
+    # While there is no loop, manual casting is acceptable:
+    res1 = ufunc(arr_string, arr_unicode, signature="UU->?", casting="unsafe")
+    res2 = ufunc(arr_string, arr_unicode, signature="SS->?", casting="unsafe")
+
+    expected = op(arr_string.astype("U"), arr_unicode)
+    assert_array_equal(res1, expected)
+    assert_array_equal(res2, expected)
+
+
+@pytest.mark.parametrize(["op", "ufunc", "sym"], COMPARISONS)
+@pytest.mark.parametrize("dtypes", [
+        ("S2", "S2"), ("S2", "S10"),
+        ("<U1", "<U1"), ("<U1", ">U1"), (">U1", ">U1"),
+        ("<U1", "<U10"), ("<U1", ">U10")])
+@pytest.mark.parametrize("aligned", [True, False])
+def test_string_comparisons(op, ufunc, sym, dtypes, aligned):
+    # ensure native byte-order for the first view to stay within unicode range
+    native_dt = np.dtype(dtypes[0]).newbyteorder("=")
+    arr = np.arange(2**15).view(native_dt).astype(dtypes[0])
+    if not aligned:
+        # Make `arr` unaligned:
+        new = np.zeros(arr.nbytes + 1, dtype=np.uint8)[1:].view(dtypes[0])
+        new[...] = arr
+        arr = new
+
+    arr2 = arr.astype(dtypes[1], copy=True)
+    np.random.shuffle(arr2)
+    arr[0] = arr2[0]  # make sure one matches
+
+    expected = [op(d1, d2) for d1, d2 in zip(arr.tolist(), arr2.tolist())]
+    assert_array_equal(op(arr, arr2), expected)
+    assert_array_equal(ufunc(arr, arr2), expected)
+    assert_array_equal(
+        np.char.compare_chararrays(arr, arr2, sym, False), expected
+    )
+
+    expected = [op(d2, d1) for d1, d2 in zip(arr.tolist(), arr2.tolist())]
+    assert_array_equal(op(arr2, arr), expected)
+    assert_array_equal(ufunc(arr2, arr), expected)
+    assert_array_equal(
+        np.char.compare_chararrays(arr2, arr, sym, False), expected
+    )
+
+
+@pytest.mark.parametrize(["op", "ufunc", "sym"], COMPARISONS)
+@pytest.mark.parametrize("dtypes", [
+        ("S2", "S2"), ("S2", "S10"), ("<U1", "<U1"), ("<U1", ">U10")])
+def test_string_comparisons_empty(op, ufunc, sym, dtypes):
+    arr = np.empty((1, 0, 1, 5), dtype=dtypes[0])
+    arr2 = np.empty((100, 1, 0, 1), dtype=dtypes[1])
+
+    expected = np.empty(np.broadcast_shapes(arr.shape, arr2.shape), dtype=bool)
+    assert_array_equal(op(arr, arr2), expected)
+    assert_array_equal(ufunc(arr, arr2), expected)
+    assert_array_equal(
+        np.char.compare_chararrays(arr, arr2, sym, False), expected
+    )
+
+
+@pytest.mark.parametrize("str_dt", ["S", "U"])
+@pytest.mark.parametrize("float_dt", np.typecodes["AllFloat"])
+def test_float_to_string_cast(str_dt, float_dt):
+    float_dt = np.dtype(float_dt)
+    fi = np.finfo(float_dt)
+    arr = np.array([np.nan, np.inf, -np.inf, fi.max, fi.min], dtype=float_dt)
+    expected = ["nan", "inf", "-inf", str(fi.max), str(fi.min)]
+    if float_dt.kind == "c":
+        expected = [f"({r}+0j)" for r in expected]
+
+    res = arr.astype(str_dt)
+    assert_array_equal(res, np.array(expected, dtype=str_dt))
+
+
+@pytest.mark.parametrize("str_dt", "US")
+@pytest.mark.parametrize("size", [-1, np.iinfo(np.intc).max])
+def test_string_size_dtype_errors(str_dt, size):
+    if size > 0:
+        size = size // np.dtype(f"{str_dt}1").itemsize + 1
+
+    with pytest.raises(ValueError):
+        np.dtype((str_dt, size))
+    with pytest.raises(TypeError):
+        np.dtype(f"{str_dt}{size}")
+
+
+@pytest.mark.parametrize("str_dt", "US")
+def test_string_size_dtype_large_repr(str_dt):
+    size = np.iinfo(np.intc).max // np.dtype(f"{str_dt}1").itemsize
+    size_str = str(size)
+
+    dtype = np.dtype((str_dt, size))
+    assert size_str in dtype.str
+    assert size_str in str(dtype)
+    assert size_str in repr(dtype)
+
+
+@pytest.mark.slow
+@requires_memory(2 * np.iinfo(np.intc).max)
+@pytest.mark.parametrize("str_dt", "US")
+def test_large_string_coercion_error(str_dt):
+    very_large = np.iinfo(np.intc).max // np.dtype(f"{str_dt}1").itemsize
+    try:
+        large_string = "A" * (very_large + 1)
+    except Exception:
+        # We may not be able to create this Python string on 32bit.
+        pytest.skip("python failed to create huge string")
+
+    class MyStr:
+        def __str__(self):
+            return large_string
+
+    try:
+        # TypeError from NumPy, or OverflowError from 32bit Python.
+        with pytest.raises((TypeError, OverflowError)):
+            np.array([large_string], dtype=str_dt)
+
+        # Same as above, but input has to be converted to a string.
+        with pytest.raises((TypeError, OverflowError)):
+            np.array([MyStr()], dtype=str_dt)
+    except MemoryError:
+        # Catch memory errors, because `requires_memory` would do so.
+        raise AssertionError("Ops should raise before any large allocation.")
+
+@pytest.mark.slow
+@requires_memory(2 * np.iinfo(np.intc).max)
+@pytest.mark.parametrize("str_dt", "US")
+def test_large_string_addition_error(str_dt):
+    very_large = np.iinfo(np.intc).max // np.dtype(f"{str_dt}1").itemsize
+
+    a = np.array(["A" * very_large], dtype=str_dt)
+    b = np.array("B", dtype=str_dt)
+    try:
+        with pytest.raises(TypeError):
+            np.add(a, b)
+        with pytest.raises(TypeError):
+            np.add(a, a)
+    except MemoryError:
+        # Catch memory errors, because `requires_memory` would do so.
+        raise AssertionError("Ops should raise before any large allocation.")
+
+
+def test_large_string_cast():
+    very_large = np.iinfo(np.intc).max // 4
+    # Could be nice to test very large path, but it makes too many huge
+    # allocations right now (need non-legacy cast loops for this).
+    # a = np.array([], dtype=np.dtype(("S", very_large)))
+    # assert a.astype("U").dtype.itemsize == very_large * 4
+
+    a = np.array([], dtype=np.dtype(("S", very_large + 1)))
+    # It is not perfect but OK if this raises a MemoryError during setup
+    # (this happens due clunky code and/or buffer setup.)
+    with pytest.raises((TypeError, MemoryError)):
+        a.astype("U")
+
+
+@pytest.mark.parametrize("dt", ["S", "U", "T"])
+class TestMethods:
+
+    @pytest.mark.parametrize("in1,in2,out", [
+        ("", "", ""),
+        ("abc", "abc", "abcabc"),
+        ("12345", "12345", "1234512345"),
+        ("MixedCase", "MixedCase", "MixedCaseMixedCase"),
+        ("12345 \0 ", "12345 \0 ", "12345 \0 12345 \0 "),
+        ("UPPER", "UPPER", "UPPERUPPER"),
+        (["abc", "def"], ["hello", "world"], ["abchello", "defworld"]),
+    ])
+    def test_add(self, in1, in2, out, dt):
+        in1 = np.array(in1, dtype=dt)
+        in2 = np.array(in2, dtype=dt)
+        out = np.array(out, dtype=dt)
+        assert_array_equal(np.strings.add(in1, in2), out)
+
+    @pytest.mark.parametrize("in1,in2,out", [
+        ("abc", 3, "abcabcabc"),
+        ("abc", 0, ""),
+        ("abc", -1, ""),
+        (["abc", "def"], [1, 4], ["abc", "defdefdefdef"]),
+    ])
+    def test_multiply(self, in1, in2, out, dt):
+        in1 = np.array(in1, dtype=dt)
+        out = np.array(out, dtype=dt)
+        assert_array_equal(np.strings.multiply(in1, in2), out)
+
+    def test_multiply_raises(self, dt):
+        with pytest.raises(TypeError, match="unsupported type"):
+            np.strings.multiply(np.array("abc", dtype=dt), 3.14)
+
+        with pytest.raises(MemoryError):
+            np.strings.multiply(np.array("abc", dtype=dt), sys.maxsize)
+
+    @pytest.mark.parametrize("i_dt", [np.int8, np.int16, np.int32,
+                                      np.int64, np.int_])
+    def test_multiply_integer_dtypes(self, i_dt, dt):
+        a = np.array("abc", dtype=dt)
+        i = np.array(3, dtype=i_dt)
+        res = np.array("abcabcabc", dtype=dt)
+        assert_array_equal(np.strings.multiply(a, i), res)
+
+    @pytest.mark.parametrize("in_,out", [
+        ("", False),
+        ("a", True),
+        ("A", True),
+        ("\n", False),
+        ("abc", True),
+        ("aBc123", False),
+        ("abc\n", False),
+        (["abc", "aBc123"], [True, False]),
+    ])
+    def test_isalpha(self, in_, out, dt):
+        in_ = np.array(in_, dtype=dt)
+        assert_array_equal(np.strings.isalpha(in_), out)
+
+    @pytest.mark.parametrize("in_,out", [
+        ('', False),
+        ('a', True),
+        ('A', True),
+        ('\n', False),
+        ('123abc456', True),
+        ('a1b3c', True),
+        ('aBc000 ', False),
+        ('abc\n', False),
+    ])
+    def test_isalnum(self, in_, out, dt):
+        in_ = np.array(in_, dtype=dt)
+        assert_array_equal(np.strings.isalnum(in_), out)
+
+    @pytest.mark.parametrize("in_,out", [
+        ("", False),
+        ("a", False),
+        ("0", True),
+        ("012345", True),
+        ("012345a", False),
+        (["a", "012345"], [False, True]),
+    ])
+    def test_isdigit(self, in_, out, dt):
+        in_ = np.array(in_, dtype=dt)
+        assert_array_equal(np.strings.isdigit(in_), out)
+
+    @pytest.mark.parametrize("in_,out", [
+        ("", False),
+        ("a", False),
+        ("1", False),
+        (" ", True),
+        ("\t", True),
+        ("\r", True),
+        ("\n", True),
+        (" \t\r \n", True),
+        (" \t\r\na", False),
+        (["\t1", " \t\r \n"], [False, True])
+    ])
+    def test_isspace(self, in_, out, dt):
+        in_ = np.array(in_, dtype=dt)
+        assert_array_equal(np.strings.isspace(in_), out)
+
+    @pytest.mark.parametrize("in_,out", [
+        ('', False),
+        ('a', True),
+        ('A', False),
+        ('\n', False),
+        ('abc', True),
+        ('aBc', False),
+        ('abc\n', True),
+    ])
+    def test_islower(self, in_, out, dt):
+        in_ = np.array(in_, dtype=dt)
+        assert_array_equal(np.strings.islower(in_), out)
+
+    @pytest.mark.parametrize("in_,out", [
+        ('', False),
+        ('a', False),
+        ('A', True),
+        ('\n', False),
+        ('ABC', True),
+        ('AbC', False),
+        ('ABC\n', True),
+    ])
+    def test_isupper(self, in_, out, dt):
+        in_ = np.array(in_, dtype=dt)
+        assert_array_equal(np.strings.isupper(in_), out)
+
+    @pytest.mark.parametrize("in_,out", [
+        ('', False),
+        ('a', False),
+        ('A', True),
+        ('\n', False),
+        ('A Titlecased Line', True),
+        ('A\nTitlecased Line', True),
+        ('A Titlecased, Line', True),
+        ('Not a capitalized String', False),
+        ('Not\ta Titlecase String', False),
+        ('Not--a Titlecase String', False),
+        ('NOT', False),
+    ])
+    def test_istitle(self, in_, out, dt):
+        in_ = np.array(in_, dtype=dt)
+        assert_array_equal(np.strings.istitle(in_), out)
+
+    @pytest.mark.parametrize("in_,out", [
+        ("", 0),
+        ("abc", 3),
+        ("12345", 5),
+        ("MixedCase", 9),
+        ("12345 \x00 ", 8),
+        ("UPPER", 5),
+        (["abc", "12345 \x00 "], [3, 8]),
+    ])
+    def test_str_len(self, in_, out, dt):
+        in_ = np.array(in_, dtype=dt)
+        assert_array_equal(np.strings.str_len(in_), out)
+
+    @pytest.mark.parametrize("a,sub,start,end,out", [
+        ("abcdefghiabc", "abc", 0, None, 0),
+        ("abcdefghiabc", "abc", 1, None, 9),
+        ("abcdefghiabc", "def", 4, None, -1),
+        ("abc", "", 0, None, 0),
+        ("abc", "", 3, None, 3),
+        ("abc", "", 4, None, -1),
+        ("rrarrrrrrrrra", "a", 0, None, 2),
+        ("rrarrrrrrrrra", "a", 4, None, 12),
+        ("rrarrrrrrrrra", "a", 4, 6, -1),
+        ("", "", 0, None, 0),
+        ("", "", 1, 1, -1),
+        ("", "", MAX, 0, -1),
+        ("", "xx", 0, None, -1),
+        ("", "xx", 1, 1, -1),
+        ("", "xx", MAX, 0, -1),
+        pytest.param(99*"a" + "b", "b", 0, None, 99,
+                     id="99*a+b-b-0-None-99"),
+        pytest.param(98*"a" + "ba", "ba", 0, None, 98,
+                     id="98*a+ba-ba-0-None-98"),
+        pytest.param(100*"a", "b", 0, None, -1,
+                     id="100*a-b-0-None--1"),
+        pytest.param(30000*"a" + 100*"b", 100*"b", 0, None, 30000,
+                     id="30000*a+100*b-100*b-0-None-30000"),
+        pytest.param(30000*"a", 100*"b", 0, None, -1,
+                     id="30000*a-100*b-0-None--1"),
+        pytest.param(15000*"a" + 15000*"b", 15000*"b", 0, None, 15000,
+                     id="15000*a+15000*b-15000*b-0-None-15000"),
+        pytest.param(15000*"a" + 15000*"b", 15000*"c", 0, None, -1,
+                     id="15000*a+15000*b-15000*c-0-None--1"),
+        (["abcdefghiabc", "rrarrrrrrrrra"], ["def", "arr"], [0, 3],
+         None, [3, -1]),
+        ("Ae¢☃€ 😊" * 2, "😊", 0, None, 6),
+        ("Ae¢☃€ 😊" * 2, "😊", 7, None, 13),
+    ])
+    def test_find(self, a, sub, start, end, out, dt):
+        if "😊" in a and dt == "S":
+            pytest.skip("Bytes dtype does not support non-ascii input")
+        a = np.array(a, dtype=dt)
+        sub = np.array(sub, dtype=dt)
+        assert_array_equal(np.strings.find(a, sub, start, end), out)
+
+    @pytest.mark.parametrize("a,sub,start,end,out", [
+        ("abcdefghiabc", "abc", 0, None, 9),
+        ("abcdefghiabc", "", 0, None, 12),
+        ("abcdefghiabc", "abcd", 0, None, 0),
+        ("abcdefghiabc", "abcz", 0, None, -1),
+        ("abc", "", 0, None, 3),
+        ("abc", "", 3, None, 3),
+        ("abc", "", 4, None, -1),
+        ("rrarrrrrrrrra", "a", 0, None, 12),
+        ("rrarrrrrrrrra", "a", 4, None, 12),
+        ("rrarrrrrrrrra", "a", 4, 6, -1),
+        (["abcdefghiabc", "rrarrrrrrrrra"], ["abc", "a"], [0, 0],
+         None, [9, 12]),
+        ("Ae¢☃€ 😊" * 2, "😊", 0, None, 13),
+        ("Ae¢☃€ 😊" * 2, "😊", 0, 7, 6),
+    ])
+    def test_rfind(self, a, sub, start, end, out, dt):
+        if "😊" in a and dt == "S":
+            pytest.skip("Bytes dtype does not support non-ascii input")
+        a = np.array(a, dtype=dt)
+        sub = np.array(sub, dtype=dt)
+        assert_array_equal(np.strings.rfind(a, sub, start, end), out)
+
+    @pytest.mark.parametrize("a,sub,start,end,out", [
+        ("aaa", "a", 0, None, 3),
+        ("aaa", "b", 0, None, 0),
+        ("aaa", "a", 1, None, 2),
+        ("aaa", "a", 10, None, 0),
+        ("aaa", "a", -1, None, 1),
+        ("aaa", "a", -10, None, 3),
+        ("aaa", "a", 0, 1, 1),
+        ("aaa", "a", 0, 10, 3),
+        ("aaa", "a", 0, -1, 2),
+        ("aaa", "a", 0, -10, 0),
+        ("aaa", "", 1, None, 3),
+        ("aaa", "", 3, None, 1),
+        ("aaa", "", 10, None, 0),
+        ("aaa", "", -1, None, 2),
+        ("aaa", "", -10, None, 4),
+        ("aaa", "aaaa", 0, None, 0),
+        pytest.param(98*"a" + "ba", "ba", 0, None, 1,
+                     id="98*a+ba-ba-0-None-1"),
+        pytest.param(30000*"a" + 100*"b", 100*"b", 0, None, 1,
+                     id="30000*a+100*b-100*b-0-None-1"),
+        pytest.param(30000*"a", 100*"b", 0, None, 0,
+                     id="30000*a-100*b-0-None-0"),
+        pytest.param(30000*"a" + 100*"ab", "ab", 0, None, 100,
+                     id="30000*a+100*ab-ab-0-None-100"),
+        pytest.param(15000*"a" + 15000*"b", 15000*"b", 0, None, 1,
+                     id="15000*a+15000*b-15000*b-0-None-1"),
+        pytest.param(15000*"a" + 15000*"b", 15000*"c", 0, None, 0,
+                     id="15000*a+15000*b-15000*c-0-None-0"),
+        ("", "", 0, None, 1),
+        ("", "", 1, 1, 0),
+        ("", "", MAX, 0, 0),
+        ("", "xx", 0, None, 0),
+        ("", "xx", 1, 1, 0),
+        ("", "xx", MAX, 0, 0),
+        (["aaa", ""], ["a", ""], [0, 0], None, [3, 1]),
+        ("Ae¢☃€ 😊" * 100, "😊", 0, None, 100),
+    ])
+    def test_count(self, a, sub, start, end, out, dt):
+        if "😊" in a and dt == "S":
+            pytest.skip("Bytes dtype does not support non-ascii input")
+        a = np.array(a, dtype=dt)
+        sub = np.array(sub, dtype=dt)
+        assert_array_equal(np.strings.count(a, sub, start, end), out)
+
+    @pytest.mark.parametrize("a,prefix,start,end,out", [
+        ("hello", "he", 0, None, True),
+        ("hello", "hello", 0, None, True),
+        ("hello", "hello world", 0, None, False),
+        ("hello", "", 0, None, True),
+        ("hello", "ello", 0, None, False),
+        ("hello", "ello", 1, None, True),
+        ("hello", "o", 4, None, True),
+        ("hello", "o", 5, None, False),
+        ("hello", "", 5, None, True),
+        ("hello", "lo", 6, None, False),
+        ("helloworld", "lowo", 3, None, True),
+        ("helloworld", "lowo", 3, 7, True),
+        ("helloworld", "lowo", 3, 6, False),
+        ("", "", 0, 1, True),
+        ("", "", 0, 0, True),
+        ("", "", 1, 0, False),
+        ("hello", "he", 0, -1, True),
+        ("hello", "he", -53, -1, True),
+        ("hello", "hello", 0, -1, False),
+        ("hello", "hello world", -1, -10, False),
+        ("hello", "ello", -5, None, False),
+        ("hello", "ello", -4, None, True),
+        ("hello", "o", -2, None, False),
+        ("hello", "o", -1, None, True),
+        ("hello", "", -3, -3, True),
+        ("hello", "lo", -9, None, False),
+        (["hello", ""], ["he", ""], [0, 0], None, [True, True]),
+    ])
+    def test_startswith(self, a, prefix, start, end, out, dt):
+        a = np.array(a, dtype=dt)
+        prefix = np.array(prefix, dtype=dt)
+        assert_array_equal(np.strings.startswith(a, prefix, start, end), out)
+
+    @pytest.mark.parametrize("a,suffix,start,end,out", [
+        ("hello", "lo", 0, None, True),
+        ("hello", "he", 0, None, False),
+        ("hello", "", 0, None, True),
+        ("hello", "hello world", 0, None, False),
+        ("helloworld", "worl", 0, None, False),
+        ("helloworld", "worl", 3, 9, True),
+        ("helloworld", "world", 3, 12, True),
+        ("helloworld", "lowo", 1, 7, True),
+        ("helloworld", "lowo", 2, 7, True),
+        ("helloworld", "lowo", 3, 7, True),
+        ("helloworld", "lowo", 4, 7, False),
+        ("helloworld", "lowo", 3, 8, False),
+        ("ab", "ab", 0, 1, False),
+        ("ab", "ab", 0, 0, False),
+        ("", "", 0, 1, True),
+        ("", "", 0, 0, True),
+        ("", "", 1, 0, False),
+        ("hello", "lo", -2, None, True),
+        ("hello", "he", -2, None, False),
+        ("hello", "", -3, -3, True),
+        ("hello", "hello world", -10, -2, False),
+        ("helloworld", "worl", -6, None, False),
+        ("helloworld", "worl", -5, -1, True),
+        ("helloworld", "worl", -5, 9, True),
+        ("helloworld", "world", -7, 12, True),
+        ("helloworld", "lowo", -99, -3, True),
+        ("helloworld", "lowo", -8, -3, True),
+        ("helloworld", "lowo", -7, -3, True),
+        ("helloworld", "lowo", 3, -4, False),
+        ("helloworld", "lowo", -8, -2, False),
+        (["hello", "helloworld"], ["lo", "worl"], [0, -6], None,
+         [True, False]),
+    ])
+    def test_endswith(self, a, suffix, start, end, out, dt):
+        a = np.array(a, dtype=dt)
+        suffix = np.array(suffix, dtype=dt)
+        assert_array_equal(np.strings.endswith(a, suffix, start, end), out)
+
+    @pytest.mark.parametrize("a,chars,out", [
+        ("", None, ""),
+        ("   hello   ", None, "hello   "),
+        ("hello", None, "hello"),
+        (" \t\n\r\f\vabc \t\n\r\f\v", None, "abc \t\n\r\f\v"),
+        (["   hello   ", "hello"], None, ["hello   ", "hello"]),
+        ("", "", ""),
+        ("", "xyz", ""),
+        ("hello", "", "hello"),
+        ("xyzzyhelloxyzzy", "xyz", "helloxyzzy"),
+        ("hello", "xyz", "hello"),
+        ("xyxz", "xyxz", ""),
+        ("xyxzx", "x", "yxzx"),
+        (["xyzzyhelloxyzzy", "hello"], ["xyz", "xyz"],
+         ["helloxyzzy", "hello"]),
+        (["ba", "ac", "baa", "bba"], "b", ["a", "ac", "aa", "a"]),
+    ])
+    def test_lstrip(self, a, chars, out, dt):
+        a = np.array(a, dtype=dt)
+        out = np.array(out, dtype=dt)
+        if chars is not None:
+            chars = np.array(chars, dtype=dt)
+            assert_array_equal(np.strings.lstrip(a, chars), out)
+        else:
+            assert_array_equal(np.strings.lstrip(a), out)
+
+    @pytest.mark.parametrize("a,chars,out", [
+        ("", None, ""),
+        ("   hello   ", None, "   hello"),
+        ("hello", None, "hello"),
+        (" \t\n\r\f\vabc \t\n\r\f\v", None, " \t\n\r\f\vabc"),
+        (["   hello   ", "hello"], None, ["   hello", "hello"]),
+        ("", "", ""),
+        ("", "xyz", ""),
+        ("hello", "", "hello"),
+        (["hello    ", "abcdefghijklmnop"], None,
+         ["hello", "abcdefghijklmnop"]),
+        ("xyzzyhelloxyzzy", "xyz", "xyzzyhello"),
+        ("hello", "xyz", "hello"),
+        ("xyxz", "xyxz", ""),
+        ("    ", None, ""),
+        ("xyxzx", "x", "xyxz"),
+        (["xyzzyhelloxyzzy", "hello"], ["xyz", "xyz"],
+         ["xyzzyhello", "hello"]),
+        (["ab", "ac", "aab", "abb"], "b", ["a", "ac", "aa", "a"]),
+    ])
+    def test_rstrip(self, a, chars, out, dt):
+        a = np.array(a, dtype=dt)
+        out = np.array(out, dtype=dt)
+        if chars is not None:
+            chars = np.array(chars, dtype=dt)
+            assert_array_equal(np.strings.rstrip(a, chars), out)
+        else:
+            assert_array_equal(np.strings.rstrip(a), out)
+
+    @pytest.mark.parametrize("a,chars,out", [
+        ("", None, ""),
+        ("   hello   ", None, "hello"),
+        ("hello", None, "hello"),
+        (" \t\n\r\f\vabc \t\n\r\f\v", None, "abc"),
+        (["   hello   ", "hello"], None, ["hello", "hello"]),
+        ("", "", ""),
+        ("", "xyz", ""),
+        ("hello", "", "hello"),
+        ("xyzzyhelloxyzzy", "xyz", "hello"),
+        ("hello", "xyz", "hello"),
+        ("xyxz", "xyxz", ""),
+        ("xyxzx", "x", "yxz"),
+        (["xyzzyhelloxyzzy", "hello"], ["xyz", "xyz"],
+         ["hello", "hello"]),
+        (["bab", "ac", "baab", "bbabb"], "b", ["a", "ac", "aa", "a"]),
+    ])
+    def test_strip(self, a, chars, out, dt):
+        a = np.array(a, dtype=dt)
+        if chars is not None:
+            chars = np.array(chars, dtype=dt)
+        out = np.array(out, dtype=dt)
+        assert_array_equal(np.strings.strip(a, chars), out)
+
+    @pytest.mark.parametrize("buf,old,new,count,res", [
+        ("", "", "", -1, ""),
+        ("", "", "A", -1, "A"),
+        ("", "A", "", -1, ""),
+        ("", "A", "A", -1, ""),
+        ("", "", "", 100, ""),
+        ("", "", "A", 100, "A"),
+        ("A", "", "", -1, "A"),
+        ("A", "", "*", -1, "*A*"),
+        ("A", "", "*1", -1, "*1A*1"),
+        ("A", "", "*-#", -1, "*-#A*-#"),
+        ("AA", "", "*-", -1, "*-A*-A*-"),
+        ("AA", "", "*-", -1, "*-A*-A*-"),
+        ("AA", "", "*-", 4, "*-A*-A*-"),
+        ("AA", "", "*-", 3, "*-A*-A*-"),
+        ("AA", "", "*-", 2, "*-A*-A"),
+        ("AA", "", "*-", 1, "*-AA"),
+        ("AA", "", "*-", 0, "AA"),
+        ("A", "A", "", -1, ""),
+        ("AAA", "A", "", -1, ""),
+        ("AAA", "A", "", -1, ""),
+        ("AAA", "A", "", 4, ""),
+        ("AAA", "A", "", 3, ""),
+        ("AAA", "A", "", 2, "A"),
+        ("AAA", "A", "", 1, "AA"),
+        ("AAA", "A", "", 0, "AAA"),
+        ("AAAAAAAAAA", "A", "", -1, ""),
+        ("ABACADA", "A", "", -1, "BCD"),
+        ("ABACADA", "A", "", -1, "BCD"),
+        ("ABACADA", "A", "", 5, "BCD"),
+        ("ABACADA", "A", "", 4, "BCD"),
+        ("ABACADA", "A", "", 3, "BCDA"),
+        ("ABACADA", "A", "", 2, "BCADA"),
+        ("ABACADA", "A", "", 1, "BACADA"),
+        ("ABACADA", "A", "", 0, "ABACADA"),
+        ("ABCAD", "A", "", -1, "BCD"),
+        ("ABCADAA", "A", "", -1, "BCD"),
+        ("BCD", "A", "", -1, "BCD"),
+        ("*************", "A", "", -1, "*************"),
+        ("^"+"A"*1000+"^", "A", "", 999, "^A^"),
+        ("the", "the", "", -1, ""),
+        ("theater", "the", "", -1, "ater"),
+        ("thethe", "the", "", -1, ""),
+        ("thethethethe", "the", "", -1, ""),
+        ("theatheatheathea", "the", "", -1, "aaaa"),
+        ("that", "the", "", -1, "that"),
+        ("thaet", "the", "", -1, "thaet"),
+        ("here and there", "the", "", -1, "here and re"),
+        ("here and there and there", "the", "", -1, "here and re and re"),
+        ("here and there and there", "the", "", 3, "here and re and re"),
+        ("here and there and there", "the", "", 2, "here and re and re"),
+        ("here and there and there", "the", "", 1, "here and re and there"),
+        ("here and there and there", "the", "", 0, "here and there and there"),
+        ("here and there and there", "the", "", -1, "here and re and re"),
+        ("abc", "the", "", -1, "abc"),
+        ("abcdefg", "the", "", -1, "abcdefg"),
+        ("bbobob", "bob", "", -1, "bob"),
+        ("bbobobXbbobob", "bob", "", -1, "bobXbob"),
+        ("aaaaaaabob", "bob", "", -1, "aaaaaaa"),
+        ("aaaaaaa", "bob", "", -1, "aaaaaaa"),
+        ("Who goes there?", "o", "o", -1, "Who goes there?"),
+        ("Who goes there?", "o", "O", -1, "WhO gOes there?"),
+        ("Who goes there?", "o", "O", -1, "WhO gOes there?"),
+        ("Who goes there?", "o", "O", 3, "WhO gOes there?"),
+        ("Who goes there?", "o", "O", 2, "WhO gOes there?"),
+        ("Who goes there?", "o", "O", 1, "WhO goes there?"),
+        ("Who goes there?", "o", "O", 0, "Who goes there?"),
+        ("Who goes there?", "a", "q", -1, "Who goes there?"),
+        ("Who goes there?", "W", "w", -1, "who goes there?"),
+        ("WWho goes there?WW", "W", "w", -1, "wwho goes there?ww"),
+        ("Who goes there?", "?", "!", -1, "Who goes there!"),
+        ("Who goes there??", "?", "!", -1, "Who goes there!!"),
+        ("Who goes there?", ".", "!", -1, "Who goes there?"),
+        ("This is a tissue", "is", "**", -1, "Th** ** a t**sue"),
+        ("This is a tissue", "is", "**", -1, "Th** ** a t**sue"),
+        ("This is a tissue", "is", "**", 4, "Th** ** a t**sue"),
+        ("This is a tissue", "is", "**", 3, "Th** ** a t**sue"),
+        ("This is a tissue", "is", "**", 2, "Th** ** a tissue"),
+        ("This is a tissue", "is", "**", 1, "Th** is a tissue"),
+        ("This is a tissue", "is", "**", 0, "This is a tissue"),
+        ("bobob", "bob", "cob", -1, "cobob"),
+        ("bobobXbobobob", "bob", "cob", -1, "cobobXcobocob"),
+        ("bobob", "bot", "bot", -1, "bobob"),
+        ("Reykjavik", "k", "KK", -1, "ReyKKjaviKK"),
+        ("Reykjavik", "k", "KK", -1, "ReyKKjaviKK"),
+        ("Reykjavik", "k", "KK", 2, "ReyKKjaviKK"),
+        ("Reykjavik", "k", "KK", 1, "ReyKKjavik"),
+        ("Reykjavik", "k", "KK", 0, "Reykjavik"),
+        ("A.B.C.", ".", "----", -1, "A----B----C----"),
+        ("Reykjavik", "q", "KK", -1, "Reykjavik"),
+        ("spam, spam, eggs and spam", "spam", "ham", -1,
+            "ham, ham, eggs and ham"),
+        ("spam, spam, eggs and spam", "spam", "ham", -1,
+            "ham, ham, eggs and ham"),
+        ("spam, spam, eggs and spam", "spam", "ham", 4,
+            "ham, ham, eggs and ham"),
+        ("spam, spam, eggs and spam", "spam", "ham", 3,
+            "ham, ham, eggs and ham"),
+        ("spam, spam, eggs and spam", "spam", "ham", 2,
+            "ham, ham, eggs and spam"),
+        ("spam, spam, eggs and spam", "spam", "ham", 1,
+            "ham, spam, eggs and spam"),
+        ("spam, spam, eggs and spam", "spam", "ham", 0,
+            "spam, spam, eggs and spam"),
+        ("bobobob", "bobob", "bob", -1, "bobob"),
+        ("bobobobXbobobob", "bobob", "bob", -1, "bobobXbobob"),
+        ("BOBOBOB", "bob", "bobby", -1, "BOBOBOB"),
+        ("one!two!three!", "!", "@", 1, "one@two!three!"),
+        ("one!two!three!", "!", "", -1, "onetwothree"),
+        ("one!two!three!", "!", "@", 2, "one@two@three!"),
+        ("one!two!three!", "!", "@", 3, "one@two@three@"),
+        ("one!two!three!", "!", "@", 4, "one@two@three@"),
+        ("one!two!three!", "!", "@", 0, "one!two!three!"),
+        ("one!two!three!", "!", "@", -1, "one@two@three@"),
+        ("one!two!three!", "x", "@", -1, "one!two!three!"),
+        ("one!two!three!", "x", "@", 2, "one!two!three!"),
+        ("abc", "", "-", -1, "-a-b-c-"),
+        ("abc", "", "-", 3, "-a-b-c"),
+        ("abc", "", "-", 0, "abc"),
+        ("abc", "ab", "--", 0, "abc"),
+        ("abc", "xy", "--", -1, "abc"),
+        (["abbc", "abbd"], "b", "z", [1, 2], ["azbc", "azzd"]),
+    ])
+    def test_replace(self, buf, old, new, count, res, dt):
+        if "😊" in buf and dt == "S":
+            pytest.skip("Bytes dtype does not support non-ascii input")
+        buf = np.array(buf, dtype=dt)
+        old = np.array(old, dtype=dt)
+        new = np.array(new, dtype=dt)
+        res = np.array(res, dtype=dt)
+        assert_array_equal(np.strings.replace(buf, old, new, count), res)
+
+    @pytest.mark.parametrize("buf,sub,start,end,res", [
+        ("abcdefghiabc", "", 0, None, 0),
+        ("abcdefghiabc", "def", 0, None, 3),
+        ("abcdefghiabc", "abc", 0, None, 0),
+        ("abcdefghiabc", "abc", 1, None, 9),
+    ])
+    def test_index(self, buf, sub, start, end, res, dt):
+        buf = np.array(buf, dtype=dt)
+        sub = np.array(sub, dtype=dt)
+        assert_array_equal(np.strings.index(buf, sub, start, end), res)
+
+    @pytest.mark.parametrize("buf,sub,start,end", [
+        ("abcdefghiabc", "hib", 0, None),
+        ("abcdefghiab", "abc", 1, None),
+        ("abcdefghi", "ghi", 8, None),
+        ("abcdefghi", "ghi", -1, None),
+        ("rrarrrrrrrrra", "a", 4, 6),
+    ])
+    def test_index_raises(self, buf, sub, start, end, dt):
+        buf = np.array(buf, dtype=dt)
+        sub = np.array(sub, dtype=dt)
+        with pytest.raises(ValueError, match="substring not found"):
+            np.strings.index(buf, sub, start, end)
+
+    @pytest.mark.parametrize("buf,sub,start,end,res", [
+        ("abcdefghiabc", "", 0, None, 12),
+        ("abcdefghiabc", "def", 0, None, 3),
+        ("abcdefghiabc", "abc", 0, None, 9),
+        ("abcdefghiabc", "abc", 0, -1, 0),
+    ])
+    def test_rindex(self, buf, sub, start, end, res, dt):
+        buf = np.array(buf, dtype=dt)
+        sub = np.array(sub, dtype=dt)
+        assert_array_equal(np.strings.rindex(buf, sub, start, end), res)
+
+    @pytest.mark.parametrize("buf,sub,start,end", [
+        ("abcdefghiabc", "hib", 0, None),
+        ("defghiabc", "def", 1, None),
+        ("defghiabc", "abc", 0, -1),
+        ("abcdefghi", "ghi", 0, 8),
+        ("abcdefghi", "ghi", 0, -1),
+        ("rrarrrrrrrrra", "a", 4, 6),
+    ])
+    def test_rindex_raises(self, buf, sub, start, end, dt):
+        buf = np.array(buf, dtype=dt)
+        sub = np.array(sub, dtype=dt)
+        with pytest.raises(ValueError, match="substring not found"):
+            np.strings.rindex(buf, sub, start, end)
+
+    @pytest.mark.parametrize("buf,tabsize,res", [
+        ("abc\rab\tdef\ng\thi", 8, "abc\rab      def\ng       hi"),
+        ("abc\rab\tdef\ng\thi", 4, "abc\rab  def\ng   hi"),
+        ("abc\r\nab\tdef\ng\thi", 8, "abc\r\nab      def\ng       hi"),
+        ("abc\r\nab\tdef\ng\thi", 4, "abc\r\nab  def\ng   hi"),
+        ("abc\r\nab\r\ndef\ng\r\nhi", 4, "abc\r\nab\r\ndef\ng\r\nhi"),
+        (" \ta\n\tb", 1, "  a\n b"),
+    ])
+    def test_expandtabs(self, buf, tabsize, res, dt):
+        buf = np.array(buf, dtype=dt)
+        res = np.array(res, dtype=dt)
+        assert_array_equal(np.strings.expandtabs(buf, tabsize), res)
+
+    def test_expandtabs_raises_overflow(self, dt):
+        with pytest.raises(OverflowError, match="new string is too long"):
+            np.strings.expandtabs(np.array("\ta\n\tb", dtype=dt), sys.maxsize)
+            np.strings.expandtabs(np.array("\ta\n\tb", dtype=dt), 2**61)
+
+    FILL_ERROR = "The fill character must be exactly one character long"
+
+    def test_center_raises_multiple_character_fill(self, dt):
+        buf = np.array("abc", dtype=dt)
+        fill = np.array("**", dtype=dt)
+        with pytest.raises(TypeError, match=self.FILL_ERROR):
+            np.strings.center(buf, 10, fill)
+
+    def test_ljust_raises_multiple_character_fill(self, dt):
+        buf = np.array("abc", dtype=dt)
+        fill = np.array("**", dtype=dt)
+        with pytest.raises(TypeError, match=self.FILL_ERROR):
+            np.strings.ljust(buf, 10, fill)
+
+    def test_rjust_raises_multiple_character_fill(self, dt):
+        buf = np.array("abc", dtype=dt)
+        fill = np.array("**", dtype=dt)
+        with pytest.raises(TypeError, match=self.FILL_ERROR):
+            np.strings.rjust(buf, 10, fill)
+
+    @pytest.mark.parametrize("buf,width,fillchar,res", [
+        ('abc', 10, ' ', '   abc    '),
+        ('abc', 6, ' ', ' abc  '),
+        ('abc', 3, ' ', 'abc'),
+        ('abc', 2, ' ', 'abc'),
+        ('abc', 10, '*', '***abc****'),
+    ])
+    def test_center(self, buf, width, fillchar, res, dt):
+        buf = np.array(buf, dtype=dt)
+        fillchar = np.array(fillchar, dtype=dt)
+        res = np.array(res, dtype=dt)
+        assert_array_equal(np.strings.center(buf, width, fillchar), res)
+
+    @pytest.mark.parametrize("buf,width,fillchar,res", [
+        ('abc', 10, ' ', 'abc       '),
+        ('abc', 6, ' ', 'abc   '),
+        ('abc', 3, ' ', 'abc'),
+        ('abc', 2, ' ', 'abc'),
+        ('abc', 10, '*', 'abc*******'),
+    ])
+    def test_ljust(self, buf, width, fillchar, res, dt):
+        buf = np.array(buf, dtype=dt)
+        fillchar = np.array(fillchar, dtype=dt)
+        res = np.array(res, dtype=dt)
+        assert_array_equal(np.strings.ljust(buf, width, fillchar), res)
+
+    @pytest.mark.parametrize("buf,width,fillchar,res", [
+        ('abc', 10, ' ', '       abc'),
+        ('abc', 6, ' ', '   abc'),
+        ('abc', 3, ' ', 'abc'),
+        ('abc', 2, ' ', 'abc'),
+        ('abc', 10, '*', '*******abc'),
+    ])
+    def test_rjust(self, buf, width, fillchar, res, dt):
+        buf = np.array(buf, dtype=dt)
+        fillchar = np.array(fillchar, dtype=dt)
+        res = np.array(res, dtype=dt)
+        assert_array_equal(np.strings.rjust(buf, width, fillchar), res)
+
+    @pytest.mark.parametrize("buf,width,res", [
+        ('123', 2, '123'),
+        ('123', 3, '123'),
+        ('0123', 4, '0123'),
+        ('+123', 3, '+123'),
+        ('+123', 4, '+123'),
+        ('+123', 5, '+0123'),
+        ('+0123', 5, '+0123'),
+        ('-123', 3, '-123'),
+        ('-123', 4, '-123'),
+        ('-0123', 5, '-0123'),
+        ('000', 3, '000'),
+        ('34', 1, '34'),
+        ('0034', 4, '0034'),
+    ])
+    def test_zfill(self, buf, width, res, dt):
+        buf = np.array(buf, dtype=dt)
+        res = np.array(res, dtype=dt)
+        assert_array_equal(np.strings.zfill(buf, width), res)
+
+    @pytest.mark.parametrize("buf,sep,res1,res2,res3", [
+        ("this is the partition method", "ti", "this is the par",
+            "ti", "tion method"),
+        ("http://www.python.org", "://", "http", "://", "www.python.org"),
+        ("http://www.python.org", "?", "http://www.python.org", "", ""),
+        ("http://www.python.org", "http://", "", "http://", "www.python.org"),
+        ("http://www.python.org", "org", "http://www.python.", "org", ""),
+        ("http://www.python.org", ["://", "?", "http://", "org"],
+            ["http", "http://www.python.org", "", "http://www.python."],
+            ["://", "", "http://", "org"],
+            ["www.python.org", "", "www.python.org", ""]),
+        ("mississippi", "ss", "mi", "ss", "issippi"),
+        ("mississippi", "i", "m", "i", "ssissippi"),
+        ("mississippi", "w", "mississippi", "", ""),
+    ])
+    def test_partition(self, buf, sep, res1, res2, res3, dt):
+        buf = np.array(buf, dtype=dt)
+        sep = np.array(sep, dtype=dt)
+        res1 = np.array(res1, dtype=dt)
+        res2 = np.array(res2, dtype=dt)
+        res3 = np.array(res3, dtype=dt)
+        act1, act2, act3 = np.strings.partition(buf, sep)
+        assert_array_equal(act1, res1)
+        assert_array_equal(act2, res2)
+        assert_array_equal(act3, res3)
+        assert_array_equal(act1 + act2 + act3, buf)
+
+    @pytest.mark.parametrize("buf,sep,res1,res2,res3", [
+        ("this is the partition method", "ti", "this is the parti",
+            "ti", "on method"),
+        ("http://www.python.org", "://", "http", "://", "www.python.org"),
+        ("http://www.python.org", "?", "", "", "http://www.python.org"),
+        ("http://www.python.org", "http://", "", "http://", "www.python.org"),
+        ("http://www.python.org", "org", "http://www.python.", "org", ""),
+        ("http://www.python.org", ["://", "?", "http://", "org"],
+            ["http", "", "", "http://www.python."],
+            ["://", "", "http://", "org"],
+            ["www.python.org", "http://www.python.org", "www.python.org", ""]),
+        ("mississippi", "ss", "missi", "ss", "ippi"),
+        ("mississippi", "i", "mississipp", "i", ""),
+        ("mississippi", "w", "", "", "mississippi"),
+    ])
+    def test_rpartition(self, buf, sep, res1, res2, res3, dt):
+        buf = np.array(buf, dtype=dt)
+        sep = np.array(sep, dtype=dt)
+        res1 = np.array(res1, dtype=dt)
+        res2 = np.array(res2, dtype=dt)
+        res3 = np.array(res3, dtype=dt)
+        act1, act2, act3 = np.strings.rpartition(buf, sep)
+        assert_array_equal(act1, res1)
+        assert_array_equal(act2, res2)
+        assert_array_equal(act3, res3)
+        assert_array_equal(act1 + act2 + act3, buf)
+
+
+@pytest.mark.parametrize("dt", ["U", "T"])
+class TestMethodsWithUnicode:
+    @pytest.mark.parametrize("in_,out", [
+        ("", False),
+        ("a", False),
+        ("0", True),
+        ("\u2460", False),  # CIRCLED DIGIT 1
+        ("\xbc", False),  # VULGAR FRACTION ONE QUARTER
+        ("\u0660", True),  # ARABIC_INDIC DIGIT ZERO
+        ("012345", True),
+        ("012345a", False),
+        (["0", "a"], [True, False]),
+    ])
+    def test_isdecimal_unicode(self, in_, out, dt):
+        buf = np.array(in_, dtype=dt)
+        assert_array_equal(np.strings.isdecimal(buf), out)
+
+    @pytest.mark.parametrize("in_,out", [
+        ("", False),
+        ("a", False),
+        ("0", True),
+        ("\u2460", True),  # CIRCLED DIGIT 1
+        ("\xbc", True),  # VULGAR FRACTION ONE QUARTER
+        ("\u0660", True),  # ARABIC_INDIC DIGIT ZERO
+        ("012345", True),
+        ("012345a", False),
+        (["0", "a"], [True, False]),
+    ])
+    def test_isnumeric_unicode(self, in_, out, dt):
+        buf = np.array(in_, dtype=dt)
+        assert_array_equal(np.strings.isnumeric(buf), out)
+
+    @pytest.mark.parametrize("buf,old,new,count,res", [
+        ("...\u043c......<", "<", "&lt;", -1, "...\u043c......&lt;"),
+        ("Ae¢☃€ 😊" * 2, "A", "B", -1, "Be¢☃€ 😊Be¢☃€ 😊"),
+        ("Ae¢☃€ 😊" * 2, "😊", "B", -1, "Ae¢☃€ BAe¢☃€ B"),
+    ])
+    def test_replace_unicode(self, buf, old, new, count, res, dt):
+        buf = np.array(buf, dtype=dt)
+        old = np.array(old, dtype=dt)
+        new = np.array(new, dtype=dt)
+        res = np.array(res, dtype=dt)
+        assert_array_equal(np.strings.replace(buf, old, new, count), res)
+
+    @pytest.mark.parametrize("in_", [
+        '\U00010401',
+        '\U00010427',
+        '\U00010429',
+        '\U0001044E',
+        '\U0001D7F6',
+        '\U00011066',
+        '\U000104A0',
+        pytest.param('\U0001F107', marks=pytest.mark.xfail(
+            sys.platform == 'win32' and IS_PYPY_LT_7_3_16,
+            reason="PYPY bug in Py_UNICODE_ISALNUM",
+            strict=True)),
+    ])
+    def test_isalnum_unicode(self, in_, dt):
+        in_ = np.array(in_, dtype=dt)
+        assert_array_equal(np.strings.isalnum(in_), True)
+
+    @pytest.mark.parametrize("in_,out", [
+        ('\u1FFc', False),
+        ('\u2167', False),
+        ('\U00010401', False),
+        ('\U00010427', False),
+        ('\U0001F40D', False),
+        ('\U0001F46F', False),
+        ('\u2177', True),
+        pytest.param('\U00010429', True, marks=pytest.mark.xfail(
+            sys.platform == 'win32' and IS_PYPY_LT_7_3_16,
+            reason="PYPY bug in Py_UNICODE_ISLOWER",
+            strict=True)),
+        ('\U0001044E', True),
+    ])
+    def test_islower_unicode(self, in_, out, dt):
+        in_ = np.array(in_, dtype=dt)
+        assert_array_equal(np.strings.islower(in_), out)
+
+    @pytest.mark.parametrize("in_,out", [
+        ('\u1FFc', False),
+        ('\u2167', True),
+        ('\U00010401', True),
+        ('\U00010427', True),
+        ('\U0001F40D', False),
+        ('\U0001F46F', False),
+        ('\u2177', False),
+        pytest.param('\U00010429', False, marks=pytest.mark.xfail(
+            sys.platform == 'win32' and IS_PYPY_LT_7_3_16,
+            reason="PYPY bug in Py_UNICODE_ISUPPER",
+            strict=True)),
+        ('\U0001044E', False),
+    ])
+    def test_isupper_unicode(self, in_, out, dt):
+        in_ = np.array(in_, dtype=dt)
+        assert_array_equal(np.strings.isupper(in_), out)
+
+    @pytest.mark.parametrize("in_,out", [
+        ('\u1FFc', True),
+        ('Greek \u1FFcitlecases ...', True),
+        pytest.param('\U00010401\U00010429', True, marks=pytest.mark.xfail(
+            sys.platform == 'win32' and IS_PYPY_LT_7_3_16,
+            reason="PYPY bug in Py_UNICODE_ISISTITLE",
+            strict=True)),
+        ('\U00010427\U0001044E', True),
+        pytest.param('\U00010429', False, marks=pytest.mark.xfail(
+            sys.platform == 'win32' and IS_PYPY_LT_7_3_16,
+            reason="PYPY bug in Py_UNICODE_ISISTITLE",
+            strict=True)),
+        ('\U0001044E', False),
+        ('\U0001F40D', False),
+        ('\U0001F46F', False),
+    ])
+    def test_istitle_unicode(self, in_, out, dt):
+        in_ = np.array(in_, dtype=dt)
+        assert_array_equal(np.strings.istitle(in_), out)
+
+    @pytest.mark.parametrize("buf,sub,start,end,res", [
+        ("Ae¢☃€ 😊" * 2, "😊", 0, None, 6),
+        ("Ae¢☃€ 😊" * 2, "😊", 7, None, 13),
+    ])
+    def test_index_unicode(self, buf, sub, start, end, res, dt):
+        buf = np.array(buf, dtype=dt)
+        sub = np.array(sub, dtype=dt)
+        assert_array_equal(np.strings.index(buf, sub, start, end), res)
+
+    def test_index_raises_unicode(self, dt):
+        with pytest.raises(ValueError, match="substring not found"):
+            np.strings.index("Ae¢☃€ 😊", "😀")
+
+    @pytest.mark.parametrize("buf,res", [
+        ("Ae¢☃€ \t 😊", "Ae¢☃€    😊"),
+        ("\t\U0001044E", "        \U0001044E"),
+    ])
+    def test_expandtabs(self, buf, res, dt):
+        buf = np.array(buf, dtype=dt)
+        res = np.array(res, dtype=dt)
+        assert_array_equal(np.strings.expandtabs(buf), res)
+
+    @pytest.mark.parametrize("buf,width,fillchar,res", [
+        ('x', 2, '\U0001044E', 'x\U0001044E'),
+        ('x', 3, '\U0001044E', '\U0001044Ex\U0001044E'),
+        ('x', 4, '\U0001044E', '\U0001044Ex\U0001044E\U0001044E'),
+    ])
+    def test_center(self, buf, width, fillchar, res, dt):
+        buf = np.array(buf, dtype=dt)
+        fillchar = np.array(fillchar, dtype=dt)
+        res = np.array(res, dtype=dt)
+        assert_array_equal(np.strings.center(buf, width, fillchar), res)
+
+    @pytest.mark.parametrize("buf,width,fillchar,res", [
+        ('x', 2, '\U0001044E', 'x\U0001044E'),
+        ('x', 3, '\U0001044E', 'x\U0001044E\U0001044E'),
+        ('x', 4, '\U0001044E', 'x\U0001044E\U0001044E\U0001044E'),
+    ])
+    def test_ljust(self, buf, width, fillchar, res, dt):
+        buf = np.array(buf, dtype=dt)
+        fillchar = np.array(fillchar, dtype=dt)
+        res = np.array(res, dtype=dt)
+        assert_array_equal(np.strings.ljust(buf, width, fillchar), res)
+
+    @pytest.mark.parametrize("buf,width,fillchar,res", [
+        ('x', 2, '\U0001044E', '\U0001044Ex'),
+        ('x', 3, '\U0001044E', '\U0001044E\U0001044Ex'),
+        ('x', 4, '\U0001044E', '\U0001044E\U0001044E\U0001044Ex'),
+    ])
+    def test_rjust(self, buf, width, fillchar, res, dt):
+        buf = np.array(buf, dtype=dt)
+        fillchar = np.array(fillchar, dtype=dt)
+        res = np.array(res, dtype=dt)
+        assert_array_equal(np.strings.rjust(buf, width, fillchar), res)
+
+    @pytest.mark.parametrize("buf,sep,res1,res2,res3", [
+        ("āāāāĀĀĀĀ", "Ă", "āāāāĀĀĀĀ", "", ""),
+        ("āāāāĂĀĀĀĀ", "Ă", "āāāā", "Ă", "ĀĀĀĀ"),
+        ("āāāāĂĂĀĀĀĀ", "ĂĂ", "āāāā", "ĂĂ", "ĀĀĀĀ"),
+        ("𐌁𐌁𐌁𐌁𐌀𐌀𐌀𐌀", "𐌂", "𐌁𐌁𐌁𐌁𐌀𐌀𐌀𐌀", "", ""),
+        ("𐌁𐌁𐌁𐌁𐌂𐌀𐌀𐌀𐌀", "𐌂", "𐌁𐌁𐌁𐌁", "𐌂", "𐌀𐌀𐌀𐌀"),
+        ("𐌁𐌁𐌁𐌁𐌂𐌂𐌀𐌀𐌀𐌀", "𐌂𐌂", "𐌁𐌁𐌁𐌁", "𐌂𐌂", "𐌀𐌀𐌀𐌀"),
+        ("𐌁𐌁𐌁𐌁𐌂𐌂𐌂𐌂𐌀𐌀𐌀𐌀", "𐌂𐌂𐌂𐌂", "𐌁𐌁𐌁𐌁", "𐌂𐌂𐌂𐌂", "𐌀𐌀𐌀𐌀"),
+    ])
+    def test_partition(self, buf, sep, res1, res2, res3, dt):
+        buf = np.array(buf, dtype=dt)
+        sep = np.array(sep, dtype=dt)
+        res1 = np.array(res1, dtype=dt)
+        res2 = np.array(res2, dtype=dt)
+        res3 = np.array(res3, dtype=dt)
+        act1, act2, act3 = np.strings.partition(buf, sep)
+        assert_array_equal(act1, res1)
+        assert_array_equal(act2, res2)
+        assert_array_equal(act3, res3)
+        assert_array_equal(act1 + act2 + act3, buf)
+
+    @pytest.mark.parametrize("buf,sep,res1,res2,res3", [
+        ("āāāāĀĀĀĀ", "Ă", "", "", "āāāāĀĀĀĀ"),
+        ("āāāāĂĀĀĀĀ", "Ă", "āāāā", "Ă", "ĀĀĀĀ"),
+        ("āāāāĂĂĀĀĀĀ", "ĂĂ", "āāāā", "ĂĂ", "ĀĀĀĀ"),
+        ("𐌁𐌁𐌁𐌁𐌀𐌀𐌀𐌀", "𐌂", "", "", "𐌁𐌁𐌁𐌁𐌀𐌀𐌀𐌀"),
+        ("𐌁𐌁𐌁𐌁𐌂𐌀𐌀𐌀𐌀", "𐌂", "𐌁𐌁𐌁𐌁", "𐌂", "𐌀𐌀𐌀𐌀"),
+        ("𐌁𐌁𐌁𐌁𐌂𐌂𐌀𐌀𐌀𐌀", "𐌂𐌂", "𐌁𐌁𐌁𐌁", "𐌂𐌂", "𐌀𐌀𐌀𐌀"),
+    ])
+    def test_rpartition(self, buf, sep, res1, res2, res3, dt):
+        buf = np.array(buf, dtype=dt)
+        sep = np.array(sep, dtype=dt)
+        res1 = np.array(res1, dtype=dt)
+        res2 = np.array(res2, dtype=dt)
+        res3 = np.array(res3, dtype=dt)
+        act1, act2, act3 = np.strings.rpartition(buf, sep)
+        assert_array_equal(act1, res1)
+        assert_array_equal(act2, res2)
+        assert_array_equal(act3, res3)
+        assert_array_equal(act1 + act2 + act3, buf)
+
+    @pytest.mark.parametrize("method", ["strip", "lstrip", "rstrip"])
+    @pytest.mark.parametrize(
+        "source,strip",
+        [
+            ("λμ", "μ"),
+            ("λμ", "λ"),
+            ("λ"*5 + "μ"*2, "μ"),
+            ("λ" * 5 + "μ" * 2, "λ"),
+            ("λ" * 5 + "A" + "μ" * 2, "μλ"),
+            ("λμ" * 5, "μ"),
+            ("λμ" * 5, "λ"),
+    ])
+    def test_strip_functions_unicode(self, source, strip, method, dt):
+        src_array = np.array([source], dtype=dt)
+
+        npy_func = getattr(np.strings, method)
+        py_func = getattr(str, method)
+
+        expected = np.array([py_func(source, strip)], dtype=dt)
+        actual = npy_func(src_array, strip)
+
+        assert_array_equal(actual, expected)
+
+
+class TestMixedTypeMethods:
+    def test_center(self):
+        buf = np.array("😊", dtype="U")
+        fill = np.array("*", dtype="S")
+        res = np.array("*😊*", dtype="U")
+        assert_array_equal(np.strings.center(buf, 3, fill), res)
+
+        buf = np.array("s", dtype="S")
+        fill = np.array("*", dtype="U")
+        res = np.array("*s*", dtype="S")
+        assert_array_equal(np.strings.center(buf, 3, fill), res)
+
+        with pytest.raises(ValueError, match="'ascii' codec can't encode"):
+            buf = np.array("s", dtype="S")
+            fill = np.array("😊", dtype="U")
+            np.strings.center(buf, 3, fill)
+
+    def test_ljust(self):
+        buf = np.array("😊", dtype="U")
+        fill = np.array("*", dtype="S")
+        res = np.array("😊**", dtype="U")
+        assert_array_equal(np.strings.ljust(buf, 3, fill), res)
+
+        buf = np.array("s", dtype="S")
+        fill = np.array("*", dtype="U")
+        res = np.array("s**", dtype="S")
+        assert_array_equal(np.strings.ljust(buf, 3, fill), res)
+
+        with pytest.raises(ValueError, match="'ascii' codec can't encode"):
+            buf = np.array("s", dtype="S")
+            fill = np.array("😊", dtype="U")
+            np.strings.ljust(buf, 3, fill)
+
+    def test_rjust(self):
+        buf = np.array("😊", dtype="U")
+        fill = np.array("*", dtype="S")
+        res = np.array("**😊", dtype="U")
+        assert_array_equal(np.strings.rjust(buf, 3, fill), res)
+
+        buf = np.array("s", dtype="S")
+        fill = np.array("*", dtype="U")
+        res = np.array("**s", dtype="S")
+        assert_array_equal(np.strings.rjust(buf, 3, fill), res)
+
+        with pytest.raises(ValueError, match="'ascii' codec can't encode"):
+            buf = np.array("s", dtype="S")
+            fill = np.array("😊", dtype="U")
+            np.strings.rjust(buf, 3, fill)
+
+
+class TestUnicodeOnlyMethodsRaiseWithBytes:
+    def test_isdecimal_raises(self):
+        in_ = np.array(b"1")
+        with assert_raises(TypeError):
+            np.strings.isdecimal(in_)
+
+    def test_isnumeric_bytes(self):
+        in_ = np.array(b"1")
+        with assert_raises(TypeError):
+            np.strings.isnumeric(in_)
+
+
+def check_itemsize(n_elem, dt):
+    if dt == "T":
+        return np.dtype(dt).itemsize
+    if dt == "S":
+        return n_elem
+    if dt == "U":
+        return n_elem * 4
+
+@pytest.mark.parametrize("dt", ["S", "U", "T"])
+class TestReplaceOnArrays:
+
+    def test_replace_count_and_size(self, dt):
+        a = np.array(["0123456789" * i for i in range(4)], dtype=dt)
+        r1 = np.strings.replace(a, "5", "ABCDE")
+        assert r1.dtype.itemsize == check_itemsize(3*10 + 3*4, dt)
+        r1_res = np.array(["01234ABCDE6789" * i for i in range(4)], dtype=dt)
+        assert_array_equal(r1, r1_res)
+        r2 = np.strings.replace(a, "5", "ABCDE", 1)
+        assert r2.dtype.itemsize == check_itemsize(3*10 + 4, dt)
+        r3 = np.strings.replace(a, "5", "ABCDE", 0)
+        assert r3.dtype.itemsize == a.dtype.itemsize
+        assert_array_equal(r3, a)
+        # Negative values mean to replace all.
+        r4 = np.strings.replace(a, "5", "ABCDE", -1)
+        assert r4.dtype.itemsize == check_itemsize(3*10 + 3*4, dt)
+        assert_array_equal(r4, r1)
+        # We can do count on an element-by-element basis.
+        r5 = np.strings.replace(a, "5", "ABCDE", [-1, -1, -1, 1])
+        assert r5.dtype.itemsize == check_itemsize(3*10 + 4, dt)
+        assert_array_equal(r5, np.array(
+            ["01234ABCDE6789" * i for i in range(3)]
+            + ["01234ABCDE6789" + "0123456789" * 2], dtype=dt))
+
+    def test_replace_broadcasting(self, dt):
+        a = np.array("0,0,0", dtype=dt)
+        r1 = np.strings.replace(a, "0", "1", np.arange(3))
+        assert r1.dtype == a.dtype
+        assert_array_equal(r1, np.array(["0,0,0", "1,0,0", "1,1,0"], dtype=dt))
+        r2 = np.strings.replace(a, "0", [["1"], ["2"]], np.arange(1, 4))
+        assert_array_equal(r2, np.array([["1,0,0", "1,1,0", "1,1,1"],
+                                         ["2,0,0", "2,2,0", "2,2,2"]],
+                                        dtype=dt))
+        r3 = np.strings.replace(a, ["0", "0,0", "0,0,0"], "X")
+        assert_array_equal(r3, np.array(["X,X,X", "X,0", "X"], dtype=dt))

mantis_evalkit/lib/python3.10/site-packages/numpy/_core/tests/test_umath_accuracy.py

@@ -0,0 +1,121 @@
+import numpy as np
+import os
+from os import path
+import sys
+import pytest
+from ctypes import c_longlong, c_double, c_float, c_int, cast, pointer, POINTER
+from numpy.testing import assert_array_max_ulp
+from numpy.testing._private.utils import _glibc_older_than
+from numpy._core._multiarray_umath import __cpu_features__
+
+UNARY_UFUNCS = [obj for obj in np._core.umath.__dict__.values() if
+        isinstance(obj, np.ufunc)]
+UNARY_OBJECT_UFUNCS = [uf for uf in UNARY_UFUNCS if "O->O" in uf.types]
+
+# Remove functions that do not support `floats`
+UNARY_OBJECT_UFUNCS.remove(np.invert)
+UNARY_OBJECT_UFUNCS.remove(np.bitwise_count)
+
+IS_AVX = __cpu_features__.get('AVX512F', False) or \
+        (__cpu_features__.get('FMA3', False) and __cpu_features__.get('AVX2', False))
+
+IS_AVX512FP16 = __cpu_features__.get('AVX512FP16', False)
+
+# only run on linux with AVX, also avoid old glibc (numpy/numpy#20448).
+runtest = (sys.platform.startswith('linux')
+           and IS_AVX and not _glibc_older_than("2.17"))
+platform_skip = pytest.mark.skipif(not runtest,
+                                   reason="avoid testing inconsistent platform "
+                                   "library implementations")
+
+# convert string to hex function taken from:
+# https://stackoverflow.com/questions/1592158/convert-hex-to-float #
+def convert(s, datatype="np.float32"):
+    i = int(s, 16)                   # convert from hex to a Python int
+    if (datatype == "np.float64"):
+        cp = pointer(c_longlong(i))           # make this into a c long long integer
+        fp = cast(cp, POINTER(c_double))  # cast the int pointer to a double pointer
+    else:
+        cp = pointer(c_int(i))           # make this into a c integer
+        fp = cast(cp, POINTER(c_float))  # cast the int pointer to a float pointer
+
+    return fp.contents.value         # dereference the pointer, get the float
+
+str_to_float = np.vectorize(convert)
+
+class TestAccuracy:
+    @platform_skip
+    def test_validate_transcendentals(self):
+        with np.errstate(all='ignore'):
+            data_dir = path.join(path.dirname(__file__), 'data')
+            files = os.listdir(data_dir)
+            files = list(filter(lambda f: f.endswith('.csv'), files))
+            for filename in files:
+                filepath = path.join(data_dir, filename)
+                with open(filepath) as fid:
+                    file_without_comments = (
+                        r for r in fid if r[0] not in ('$', '#')
+                    )
+                    data = np.genfromtxt(file_without_comments,
+                                         dtype=('|S39','|S39','|S39',int),
+                                         names=('type','input','output','ulperr'),
+                                         delimiter=',',
+                                         skip_header=1)
+                    npname = path.splitext(filename)[0].split('-')[3]
+                    npfunc = getattr(np, npname)
+                    for datatype in np.unique(data['type']):
+                        data_subset = data[data['type'] == datatype]
+                        inval  = np.array(str_to_float(data_subset['input'].astype(str), data_subset['type'].astype(str)), dtype=eval(datatype))
+                        outval = np.array(str_to_float(data_subset['output'].astype(str), data_subset['type'].astype(str)), dtype=eval(datatype))
+                        perm = np.random.permutation(len(inval))
+                        inval = inval[perm]
+                        outval = outval[perm]
+                        maxulperr = data_subset['ulperr'].max()
+                        assert_array_max_ulp(npfunc(inval), outval, maxulperr)
+
+    @pytest.mark.skipif(IS_AVX512FP16,
+            reason = "SVML FP16 have slightly higher ULP errors")
+    @pytest.mark.parametrize("ufunc", UNARY_OBJECT_UFUNCS)
+    def test_validate_fp16_transcendentals(self, ufunc):
+        with np.errstate(all='ignore'):
+            arr = np.arange(65536, dtype=np.int16)
+            datafp16 = np.frombuffer(arr.tobytes(), dtype=np.float16)
+            datafp32 = datafp16.astype(np.float32)
+            assert_array_max_ulp(ufunc(datafp16), ufunc(datafp32),
+                    maxulp=1, dtype=np.float16)
+
+    @pytest.mark.skipif(not IS_AVX512FP16,
+                               reason="lower ULP only apply for SVML FP16")
+    def test_validate_svml_fp16(self):
+        max_ulp_err = {
+                "arccos": 2.54,
+                "arccosh": 2.09,
+                "arcsin": 3.06,
+                "arcsinh": 1.51,
+                "arctan": 2.61,
+                "arctanh": 1.88,
+                "cbrt": 1.57,
+                "cos": 1.43,
+                "cosh": 1.33,
+                "exp2": 1.33,
+                "exp": 1.27,
+                "expm1": 0.53,
+                "log": 1.80,
+                "log10": 1.27,
+                "log1p": 1.88,
+                "log2": 1.80,
+                "sin": 1.88,
+                "sinh": 2.05,
+                "tan": 2.26,
+                "tanh": 3.00,
+                }
+
+        with np.errstate(all='ignore'):
+            arr = np.arange(65536, dtype=np.int16)
+            datafp16 = np.frombuffer(arr.tobytes(), dtype=np.float16)
+            datafp32 = datafp16.astype(np.float32)
+            for func in max_ulp_err:
+                ufunc = getattr(np, func)
+                ulp = np.ceil(max_ulp_err[func])
+                assert_array_max_ulp(ufunc(datafp16), ufunc(datafp32),
+                        maxulp=ulp, dtype=np.float16)