解压Python的类型注释

Python的3.8提供了

typing.get_origin()

typing.get_args()

assert get_origin(Dict[str, int]) is dictassert get_args(Dict[int, str]) == (int, str)assert get_origin(Union[int, str]) is Unionassert get_args(Union[int, str]) == (int, str)

参见https://docs.python.org/3/library/typing.html#typing.get_origin