Function _should_unflatten_callable_args

Lib/typing.py:222–243

Internal helper for munging collections.abc.Callable's __args__. The canonical representation for a Callable's __args__ flattens the argument types, see https://github.com/python/cpython/issues/86361. For example:: >>> import collections.abc >>> P = ParamSpec('P')

(typ, args)

def _should_unflatten_callable_args(typ, args):
    """Internal helper for munging collections.abc.Callable's __args__.

    The canonical representation for a Callable's __args__ flattens the
    argument types, see https://github.com/python/cpython/issues/86361.

    For example::

        >>> import collections.abc
        >>> P = ParamSpec('P')
        >>> collections.abc.Callable[[int, int], str].__args__ == (int, int, str)
        True
        >>> collections.abc.Callable[P, str].__args__ == (P, str)
        True

    As a result, if we need to reconstruct the Callable from its __args__,
    we need to unflatten it.
    """
    return (
        typ.__origin__ is collections.abc.Callable
        and not (len(args) == 2 and _is_param_expr(args[0]))
    )


def _type_repr(obj):