def get_args()

in azure/functions/_thirdparty/typing_inspect.py [0:0]

• 25 lines of code
• 17 McCabe index (conditional complexity)

def get_args(tp, evaluate=None):
    """Get type arguments with all substitutions performed. For unions,
    basic simplifications used by Union constructor are performed.
    On versions prior to 3.7 if `evaluate` is False (default),
    report result as nested tuple, this matches
    the internal representation of types. If `evaluate` is True
    (or if Python version is 3.7 or greater), then all
    type parameters are applied (this could be time and memory expensive).
    Examples::

        get_args(int) == ()
        get_args(Union[int, Union[T, int], str][int]) == (int, str)
        get_args(Union[int, Tuple[T, int]][str]) == (int, (Tuple, str, int))

        get_args(Union[int, Tuple[T, int]][str], evaluate=True) == \
                 (int, Tuple[str, int])
        get_args(Dict[int, Tuple[T, T]][Optional[int]], evaluate=True) == \
                 (int, Tuple[Optional[int], Optional[int]])
        get_args(Callable[[], T][int], evaluate=True) == ([], int,)
    """
    if NEW_TYPING:
        if not (evaluate is None or evaluate):
            raise ValueError('evaluate can only be True in Python 3.7')
        if isinstance(tp, _GenericAlias):
            res = tp.__args__
            if get_origin(tp) is collections.abc.Callable and res[0] is not Ellipsis:
                res = (list(res[:-1]), res[-1])
            return res
        return ()
    if is_classvar(tp):
        return (tp.__type__,)
    if (
        is_generic_type(tp) or is_union_type(tp) or
        is_callable_type(tp) or is_tuple_type(tp)
    ):
        tree = tp._subs_tree()
        if isinstance(tree, tuple) and len(tree) > 1:
            if not evaluate:
                return tree[1:]
            res = _eval_args(tree[1:])
            if get_origin(tp) is Callable and res[0] is not Ellipsis:
                res = (list(res[:-1]), res[-1])
            return res
    return ()