Function _is_param_expr

Lib/_collections_abc.py:516–526

Checks if obj matches either a list of types, ``...``, ``ParamSpec`` or ``_ConcatenateGenericAlias`` from typing.py

(obj)

        return _CallableGenericAlias(Callable, tuple(new_args))

def _is_param_expr(obj):
    """Checks if obj matches either a list of types, ``...``, ``ParamSpec`` or
    ``_ConcatenateGenericAlias`` from typing.py
    """
    if obj is Ellipsis:
        return True
    if isinstance(obj, list):
        return True
    obj = type(obj)
    names = ('ParamSpec', '_ConcatenateGenericAlias')
    return obj.__module__ == 'typing' and any(obj.__name__ == name for name in names)


class Callable(metaclass=ABCMeta):