| """Subset of inspect module from upstream python |
| |
| We use this instead of upstream because upstream inspect is slow to import, and |
| significantly contributes to numpy import times. Importing this copy has almost |
| no overhead. |
| |
| """ |
| import types |
|
|
| __all__ = ['getargspec', 'formatargspec'] |
|
|
| |
| def ismethod(object): |
| """Return true if the object is an instance method. |
| |
| Instance method objects provide these attributes: |
| __doc__ documentation string |
| __name__ name with which this method was defined |
| im_class class object in which this method belongs |
| im_func function object containing implementation of method |
| im_self instance to which this method is bound, or None |
| |
| """ |
| return isinstance(object, types.MethodType) |
|
|
| def isfunction(object): |
| """Return true if the object is a user-defined function. |
| |
| Function objects provide these attributes: |
| __doc__ documentation string |
| __name__ name with which this function was defined |
| func_code code object containing compiled function bytecode |
| func_defaults tuple of any default values for arguments |
| func_doc (same as __doc__) |
| func_globals global namespace in which this function was defined |
| func_name (same as __name__) |
| |
| """ |
| return isinstance(object, types.FunctionType) |
|
|
| def iscode(object): |
| """Return true if the object is a code object. |
| |
| Code objects provide these attributes: |
| co_argcount number of arguments (not including * or ** args) |
| co_code string of raw compiled bytecode |
| co_consts tuple of constants used in the bytecode |
| co_filename name of file in which this code object was created |
| co_firstlineno number of first line in Python source code |
| co_flags bitmap: 1=optimized | 2=newlocals | 4=*arg | 8=**arg |
| co_lnotab encoded mapping of line numbers to bytecode indices |
| co_name name with which this code object was defined |
| co_names tuple of names of local variables |
| co_nlocals number of local variables |
| co_stacksize virtual machine stack space required |
| co_varnames tuple of names of arguments and local variables |
| |
| """ |
| return isinstance(object, types.CodeType) |
|
|
|
|
| |
| |
| CO_OPTIMIZED, CO_NEWLOCALS, CO_VARARGS, CO_VARKEYWORDS = 1, 2, 4, 8 |
|
|
| def getargs(co): |
| """Get information about the arguments accepted by a code object. |
| |
| Three things are returned: (args, varargs, varkw), where 'args' is |
| a list of argument names (possibly containing nested lists), and |
| 'varargs' and 'varkw' are the names of the * and ** arguments or None. |
| |
| """ |
|
|
| if not iscode(co): |
| raise TypeError('arg is not a code object') |
|
|
| nargs = co.co_argcount |
| names = co.co_varnames |
| args = list(names[:nargs]) |
|
|
| |
| |
| |
| for i in range(nargs): |
| if args[i][:1] in ['', '.']: |
| raise TypeError("tuple function arguments are not supported") |
| varargs = None |
| if co.co_flags & CO_VARARGS: |
| varargs = co.co_varnames[nargs] |
| nargs = nargs + 1 |
| varkw = None |
| if co.co_flags & CO_VARKEYWORDS: |
| varkw = co.co_varnames[nargs] |
| return args, varargs, varkw |
|
|
| def getargspec(func): |
| """Get the names and default values of a function's arguments. |
| |
| A tuple of four things is returned: (args, varargs, varkw, defaults). |
| 'args' is a list of the argument names (it may contain nested lists). |
| 'varargs' and 'varkw' are the names of the * and ** arguments or None. |
| 'defaults' is an n-tuple of the default values of the last n arguments. |
| |
| """ |
|
|
| if ismethod(func): |
| func = func.__func__ |
| if not isfunction(func): |
| raise TypeError('arg is not a Python function') |
| args, varargs, varkw = getargs(func.__code__) |
| return args, varargs, varkw, func.__defaults__ |
|
|
| def getargvalues(frame): |
| """Get information about arguments passed into a particular frame. |
| |
| A tuple of four things is returned: (args, varargs, varkw, locals). |
| 'args' is a list of the argument names (it may contain nested lists). |
| 'varargs' and 'varkw' are the names of the * and ** arguments or None. |
| 'locals' is the locals dictionary of the given frame. |
| |
| """ |
| args, varargs, varkw = getargs(frame.f_code) |
| return args, varargs, varkw, frame.f_locals |
|
|
| def joinseq(seq): |
| if len(seq) == 1: |
| return '(' + seq[0] + ',)' |
| else: |
| return '(' + ', '.join(seq) + ')' |
|
|
| def strseq(object, convert, join=joinseq): |
| """Recursively walk a sequence, stringifying each element. |
| |
| """ |
| if type(object) in [list, tuple]: |
| return join([strseq(_o, convert, join) for _o in object]) |
| else: |
| return convert(object) |
|
|
| def formatargspec(args, varargs=None, varkw=None, defaults=None, |
| formatarg=str, |
| formatvarargs=lambda name: '*' + name, |
| formatvarkw=lambda name: '**' + name, |
| formatvalue=lambda value: '=' + repr(value), |
| join=joinseq): |
| """Format an argument spec from the 4 values returned by getargspec. |
| |
| The first four arguments are (args, varargs, varkw, defaults). The |
| other four arguments are the corresponding optional formatting functions |
| that are called to turn names and values into strings. The ninth |
| argument is an optional function to format the sequence of arguments. |
| |
| """ |
| specs = [] |
| if defaults: |
| firstdefault = len(args) - len(defaults) |
| for i in range(len(args)): |
| spec = strseq(args[i], formatarg, join) |
| if defaults and i >= firstdefault: |
| spec = spec + formatvalue(defaults[i - firstdefault]) |
| specs.append(spec) |
| if varargs is not None: |
| specs.append(formatvarargs(varargs)) |
| if varkw is not None: |
| specs.append(formatvarkw(varkw)) |
| return '(' + ', '.join(specs) + ')' |
|
|
| def formatargvalues(args, varargs, varkw, locals, |
| formatarg=str, |
| formatvarargs=lambda name: '*' + name, |
| formatvarkw=lambda name: '**' + name, |
| formatvalue=lambda value: '=' + repr(value), |
| join=joinseq): |
| """Format an argument spec from the 4 values returned by getargvalues. |
| |
| The first four arguments are (args, varargs, varkw, locals). The |
| next four arguments are the corresponding optional formatting functions |
| that are called to turn names and values into strings. The ninth |
| argument is an optional function to format the sequence of arguments. |
| |
| """ |
| def convert(name, locals=locals, |
| formatarg=formatarg, formatvalue=formatvalue): |
| return formatarg(name) + formatvalue(locals[name]) |
| specs = [strseq(arg, convert, join) for arg in args] |
|
|
| if varargs: |
| specs.append(formatvarargs(varargs) + formatvalue(locals[varargs])) |
| if varkw: |
| specs.append(formatvarkw(varkw) + formatvalue(locals[varkw])) |
| return '(' + ', '.join(specs) + ')' |
|
|
