Function _signature_is_functionlike

Lib/inspect.py:2078–2098

Private helper to test if `obj` is a duck type of FunctionType. A good example of such objects are functions compiled with Cython, which have all attributes that a pure Python function would have, but have their code statically compiled.

(obj)

def _signature_is_functionlike(obj):
    """Private helper to test if `obj` is a duck type of FunctionType.
    A good example of such objects are functions compiled with
    Cython, which have all attributes that a pure Python function
    would have, but have their code statically compiled.
    """

    if not callable(obj) or isclass(obj):
        # All function-like objects are obviously callables,
        # and not classes.
        return False

    name = getattr(obj, '__name__', None)
    code = getattr(obj, '__code__', None)
    defaults = getattr(obj, '__defaults__', _void) # Important to use _void ...
    kwdefaults = getattr(obj, '__kwdefaults__', _void) # ... and not None here

    return (isinstance(code, types.CodeType) and
            isinstance(name, str) and
            (defaults is None or isinstance(defaults, tuple)) and
            (kwdefaults is None or isinstance(kwdefaults, dict)))


def _signature_strip_non_python_syntax(signature):