Function _signature_is_builtin

Lib/inspect.py:2057–2068

Private helper to test if `obj` is a callable that might support Argument Clinic's __text_signature__ protocol.

(obj)

def _signature_is_builtin(obj):
    """Private helper to test if `obj` is a callable that might
    support Argument Clinic's __text_signature__ protocol.
    """
    return (isbuiltin(obj) or
            ismethoddescriptor(obj) or
            isinstance(obj, _NonUserDefinedCallables) or
            # Can't test 'isinstance(type)' here, as it would
            # also be True for regular python classes.
            # Can't use the `in` operator here, as it would
            # invoke the custom __eq__ method.
            obj is type or obj is object)


def _signature_is_functionlike(obj):