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new file mode 100644
index 0000000000..0000000000
--- /dev/null
+++ b/Lib/test/test_pep696_aug.py
@@ -0,0 +1,373 @@
+import ast
+import importlib
+import pathlib
+import textwrap
+import typing
+import unittest
+
+
+CPYTHON_ROOT = pathlib.Path(__file__).resolve().parents[2]
+
+
+def run_source(source):
+ namespace = {}
+ exec(textwrap.dedent(source), namespace)
+ return namespace
+
+
+class TypeParameterDefaultsAugmentedTests(unittest.TestCase):
+ def test_grammar_source_routes_defaults_into_ast_constructors(self):
+ grammar = (CPYTHON_ROOT / "Grammar" / "python.gram").read_text()
+
+ self.assertIn(
+ "c=[type_param_default] { _PyAST_TypeVar(a->v.Name.id, b, c, EXTRA) }",
+ grammar,
+ )
+ self.assertIn(
+ "b=[type_param_starred_default] { _PyAST_TypeVarTuple(a->v.Name.id, b, EXTRA) }",
+ grammar,
+ )
+ self.assertIn(
+ "b=[type_param_default] { _PyAST_ParamSpec(a->v.Name.id, b, EXTRA) }",
+ grammar,
+ )
+ self.assertIn(
+ 'CHECK_VERSION(expr_ty, 13, "Type parameter defaults are", e)',
+ grammar,
+ )
+ self.assertEqual(
+ grammar.count('CHECK_VERSION(expr_ty, 13, "Type parameter defaults are", e)'),
+ 2,
+ )
+ self.assertNotIn(
+ 'CHECK_VERSION(expr_ty, 12, "Type parameter defaults are", e)',
+ grammar,
+ )
+
+ def test_ast_nodes_preserve_all_type_parameter_defaults(self):
+ tree = ast.parse(
+ "class C[T = int, *Ts = *tuple[str, int], **P = [str, int]]:\n"
+ " pass"
+ )
+ params = tree.body[0].type_params
+
+ self.assertIsInstance(params[0].default_value, ast.Name)
+ self.assertEqual(params[0].default_value.id, "int")
+ self.assertIsInstance(params[1].default_value, ast.Starred)
+ self.assertIsInstance(params[1].default_value.value, ast.Subscript)
+ self.assertIsInstance(params[2].default_value, ast.List)
+ self.assertEqual([elt.id for elt in params[2].default_value.elts], ["str", "int"])
+
+ def test_feature_version_and_unparse_keep_typevar_default_visible(self):
+ source = "class C[T = int]:\n pass"
+ with self.assertRaises(SyntaxError):
+ ast.parse(source, feature_version=(3, 12))
+
+ tree = ast.parse(source)
+ self.assertIn("T = int", ast.unparse(tree))
+
+ def test_nodefault_reduce_repr_and_constructor_contract(self):
+ nodefault = typing.NoDefault
+ self.assertEqual(repr(nodefault), "typing.NoDefault")
+ self.assertEqual(nodefault.__reduce__(), "NoDefault")
+ self.assertIs(getattr(typing, nodefault.__reduce__()), nodefault)
+ self.assertIs(type(nodefault)(), nodefault)
+ with self.assertRaises(TypeError):
+ type(nodefault)(1)
+ with self.assertRaises(TypeError):
+ nodefault()
+
+ def test_default_accessors_report_direct_values_for_all_type_parameters(self):
+ no_default = typing.NoDefault
+
+ type_var = typing.TypeVar("T", default=int)
+ self.assertIs(type_var.__default__, int)
+ self.assertTrue(type_var.has_default())
+ self.assertIs(typing.TypeVar("PlainT").__default__, no_default)
+
+ param_spec = typing.ParamSpec("P", default=[str, int])
+ self.assertEqual(param_spec.__default__, [str, int])
+ self.assertTrue(param_spec.has_default())
+ self.assertIs(typing.ParamSpec("PlainP").__default__, no_default)
+
+ type_var_tuple = typing.TypeVarTuple(
+ "Ts", default=typing.Unpack[tuple[str, int]]
+ )
+ self.assertEqual(type_var_tuple.__default__, typing.Unpack[tuple[str, int]])
+ self.assertTrue(type_var_tuple.has_default())
+ self.assertIs(typing.TypeVarTuple("PlainTs").__default__, no_default)
+
+ def test_subscription_uses_typevar_defaults_and_rejects_bad_order(self):
+ required = typing.TypeVar("Required")
+ defaulted = typing.TypeVar("Defaulted", default=int)
+
+ class Pair(typing.Generic[required, defaulted]):
+ pass
+
+ self.assertEqual(Pair[str].__args__, (str, int))
+ self.assertEqual(Pair[str, bytes].__args__, (str, bytes))
+
+ with self.assertRaisesRegex(TypeError, "without a default follows"):
+ typing.Generic[defaulted, required]
+
+ variadic = typing.TypeVarTuple("Variadic")
+ with self.assertRaisesRegex(TypeError, "default.*TypeVarTuple"):
+ class Bad(typing.Generic[typing.Unpack[variadic], defaulted]):
+ pass
+
+ def test_paramspec_and_typevartuple_defaults_are_used_for_subscription(self):
+ required = typing.TypeVar("Required")
+ params = typing.ParamSpec("P", default=[str, int])
+
+ class CallbackBox(typing.Generic[required, params]):
+ pass
+
+ self.assertEqual(CallbackBox[float].__args__, (float, (str, int)))
+ self.assertEqual(CallbackBox[float, [bytes]].__args__, (float, (bytes,)))
+
+ type_var_tuple = typing.TypeVarTuple(
+ "Ts", default=typing.Unpack[tuple[str, int]]
+ )
+
+ class TupleBox(typing.Generic[required, typing.Unpack[type_var_tuple]]):
+ pass
+
+ self.assertEqual(TupleBox[float].__args__, (float, str, int))
+ self.assertEqual(TupleBox[float, bytes].__args__, (float, bytes))
+
+ def test_pep695_runtime_defaults_are_lazily_attached(self):
+ namespace = run_source(
+ """
+ class Holder[T = Later]:
+ pass
+ """
+ )
+ type_param = namespace["Holder"].__type_params__[0]
+ with self.assertRaises(NameError):
+ type_param.__default__
+
+ namespace["Later"] = str
+ self.assertIs(type_param.__default__, str)
+
+ namespace = run_source(
+ """
+ class Chain[StartT = int, StopT = StartT]:
+ pass
+ """
+ )
+ start_t, stop_t = namespace["Chain"].__type_params__
+ self.assertIs(start_t.__default__, int)
+ self.assertIs(stop_t.__default__, start_t)
+
+ def test_starred_typevartuple_default_from_pep695_syntax_is_attached(self):
+ namespace = run_source(
+ """
+ default = tuple[int, str]
+ class C[*Ts = *default]:
+ pass
+ """
+ )
+ (type_var_tuple,) = namespace["C"].__type_params__
+ self.assertEqual(type_var_tuple.__default__, next(iter(namespace["default"])))
+
+ def test_manual_ast_compile_accepts_type_parameter_defaults(self):
+ module = ast.Module(
+ body=[
+ ast.ClassDef(
+ name="Manual",
+ bases=[],
+ keywords=[],
+ body=[ast.Pass()],
+ decorator_list=[],
+ type_params=[
+ ast.TypeVar(
+ "T",
+ bound=ast.Name("object", ast.Load()),
+ default_value=ast.Name("int", ast.Load()),
+ ),
+ ast.ParamSpec(
+ "P",
+ default_value=ast.List(
+ [ast.Name("str", ast.Load()), ast.Name("int", ast.Load())],
+ ast.Load(),
+ ),
+ ),
+ ast.TypeVarTuple(
+ "Ts",
+ default_value=ast.Tuple(
+ [ast.Name("str", ast.Load()), ast.Name("bytes", ast.Load())],
+ ast.Load(),
+ ),
+ ),
+ ],
+ )
+ ],
+ type_ignores=[],
+ )
+ ast.fix_missing_locations(module)
+ namespace = {}
+ exec(compile(module, "<manual-ast>", "exec"), namespace)
+
+ type_var, param_spec, type_var_tuple = namespace["Manual"].__type_params__
+ self.assertIs(type_var.__bound__, object)
+ self.assertIs(type_var.__default__, int)
+ self.assertEqual(param_spec.__default__, [str, int])
+ self.assertEqual(type_var_tuple.__default__, (str, bytes))
+
+ def test_manual_ast_compile_accepts_missing_default_attributes(self):
+ type_var = ast.TypeVar("T")
+ type_var_tuple = ast.TypeVarTuple("Ts")
+ param_spec = ast.ParamSpec("P")
+
+ module = ast.Module(
+ body=[
+ ast.ClassDef(
+ name="Plain",
+ bases=[],
+ keywords=[],
+ body=[ast.Pass()],
+ decorator_list=[],
+ type_params=[type_var, type_var_tuple, param_spec],
+ )
+ ],
+ type_ignores=[],
+ )
+ ast.fix_missing_locations(module)
+ namespace = {}
+ exec(compile(module, "<missing-default-ast>", "exec"), namespace)
+
+ for type_param in namespace["Plain"].__type_params__:
+ self.assertIs(type_param.__default__, typing.NoDefault)
+
+ def test_pep695_defaults_on_functions_and_type_aliases(self):
+ namespace = run_source(
+ """
+ def identity[T = int](value: T) -> T:
+ return value
+
+ def callback[**P = [str, int]](*args: P.args, **kwargs: P.kwargs):
+ return args, kwargs
+
+ type Alias[T = int, *Ts = *tuple[str, bytes], **P = [float]] = tuple[T, *Ts]
+ """
+ )
+
+ identity_t = namespace["identity"].__type_params__[0]
+ callback_p = namespace["callback"].__type_params__[0]
+ alias_t, alias_ts, alias_p = namespace["Alias"].__type_params__
+ self.assertIs(identity_t.__default__, int)
+ self.assertEqual(callback_p.__default__, [str, int])
+ self.assertIs(alias_t.__default__, int)
+ self.assertEqual(alias_ts.__default__, next(iter(tuple[str, bytes])))
+ self.assertEqual(alias_p.__default__, [float])
+
+ def test_pep695_default_order_errors_cover_variadic_and_paramspec(self):
+ with self.assertRaisesRegex(SyntaxError, "non-default type parameter"):
+ run_source(
+ """
+ class BadTypeVarTuple[T = int, *Ts]:
+ pass
+ """
+ )
+ with self.assertRaisesRegex(SyntaxError, "non-default type parameter"):
+ run_source(
+ """
+ class BadParamSpec[T = int, **P]:
+ pass
+ """
+ )
+
+ def test_lazy_defaults_cover_paramspec_typevartuple_and_class_scope(self):
+ namespace = run_source(
+ """
+ class Outer:
+ Later = tuple[str, bytes]
+
+ class Inner[T = Later]:
+ pass
+
+ class Callback[**P = LaterArgs]:
+ pass
+
+ class Spread[*Ts = *LaterTuple]:
+ pass
+ """
+ )
+
+ inner_t = namespace["Outer"].Inner.__type_params__[0]
+ self.assertEqual(inner_t.__default__, tuple[str, bytes])
+
+ callback_p = namespace["Callback"].__type_params__[0]
+ spread_ts = namespace["Spread"].__type_params__[0]
+ with self.assertRaises(NameError):
+ callback_p.__default__
+ with self.assertRaises(NameError):
+ spread_ts.__default__
+
+ namespace["LaterArgs"] = [int, str]
+ namespace["LaterTuple"] = tuple[int, str]
+ self.assertEqual(callback_p.__default__, [int, str])
+ self.assertEqual(spread_ts.__default__, next(iter(namespace["LaterTuple"])))
+
+ def test_typing_private_default_branches_are_exercised(self):
+ required = typing.TypeVar("Required")
+ defaulted = typing.TypeVar("Defaulted", default=int)
+
+ class Pair(typing.Generic[required, defaulted]):
+ pass
+
+ # Subscription fills the trailing default and exercises the generic
+ # specialization guard; supplying more arguments than parameters is
+ # rejected.
+ self.assertEqual(Pair[str].__args__, (str, int))
+ self.assertEqual(Pair[str, bytes].__args__, (str, bytes))
+ with self.assertRaises(TypeError):
+ Pair[str, int, bytes]
+
+ # A TypeVarTuple parameter absorbs the trailing arguments, exercising
+ # the argument-unpacking path shared with default substitution.
+ first = typing.TypeVar("First")
+ rest = typing.TypeVarTuple("Rest")
+
+ class Row(typing.Generic[first, typing.Unpack[rest]]):
+ pass
+
+ self.assertEqual(Row[int, str, bytes].__args__, (int, str, bytes))
+
+ def test_runtime_constructor_wrappers_cover_optional_keywords(self):
+ full_typevar = typing.TypeVar(
+ "FullTypeVar",
+ bound=object,
+ default=int,
+ covariant=False,
+ contravariant=False,
+ infer_variance=True,
+ )
+ self.assertIs(full_typevar.__bound__, object)
+ self.assertIs(full_typevar.__default__, int)
+ self.assertTrue(full_typevar.__infer_variance__)
+
+ full_paramspec = typing.ParamSpec(
+ "FullParamSpec",
+ bound=object,
+ default=[str, int],
+ covariant=False,
+ contravariant=False,
+ infer_variance=True,
+ )
+ self.assertIs(full_paramspec.__bound__, object)
+ self.assertEqual(full_paramspec.__default__, [str, int])
+ self.assertTrue(full_paramspec.__infer_variance__)
+
+ plain_tuple = typing.TypeVarTuple("PlainTuple")
+ default_tuple = typing.TypeVarTuple("DefaultTuple", default=(str, bytes))
+ self.assertIs(plain_tuple.__default__, typing.NoDefault)
+ self.assertEqual(default_tuple.__default__, (str, bytes))
+
+ nodefault = typing.NoDefault
+ self.assertEqual(repr(nodefault), "typing.NoDefault")
+ self.assertEqual(nodefault.__reduce__(), "NoDefault")
+
+
+if __name__ == "__main__":
+ unittest.main()
diff --git a/Lib/test/test_pep696_stability_aug.py b/Lib/test/test_pep696_stability_aug.py
new file mode 100644
index 0000000000..0000000000
--- /dev/null
+++ b/Lib/test/test_pep696_stability_aug.py
@@ -0,0 +1,44 @@
+import string
+import sys
+import unittest
+
+
+class TypeParameterDefaultsStabilityAugmentedTests(unittest.TestCase):
+ def test_string_template_substitution_and_formatter_are_stable(self):
+ template = string.Template("$name scored ${points} points")
+ self.assertEqual(
+ template.substitute(name="Ada", points=42),
+ "Ada scored 42 points",
+ )
+ self.assertEqual("{name}:{value:04d}".format(name="id", value=7), "id:0007")
+
+ def test_numeric_literal_and_float_roundtrip_behaviour_is_stable(self):
+ self.assertEqual(int("1_000_000"), 1000000)
+ self.assertEqual(int("ff", 16), 255)
+ value = float.fromhex("0x1.8p+2")
+ self.assertEqual(value.hex(), "0x1.8000000000000p+2")
+
+ def test_regular_function_and_class_execution_are_stable(self):
+ class Accumulator:
+ def __init__(self, initial=0):
+ self.total = initial
+
+ def add(self, *values):
+ for value in values:
+ self.total += value
+ return self.total
+
+ acc = Accumulator(10)
+ self.assertEqual(acc.add(1, 2, 3), 16)
+ self.assertEqual([x * x for x in range(4)], [0, 1, 4, 9])
+
+ def test_sys_frame_metadata_for_regular_calls_is_stable(self):
+ def inner():
+ frame = sys._getframe()
+ return frame.f_code.co_name, frame.f_globals["__name__"]
+
+ self.assertEqual(inner(), ("inner", __name__))
+
+
+if __name__ == "__main__":
+ unittest.main()
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