Python的3.8提供了typing.get_origin()与typing.get_args()此！
assert get_origin(Dict[str, int]) is dict
assert get_args(Dict[int, str]) == (int, str)
assert get_origin(Union[int, str]) is Union
assert get_args(Union[int, str]) == (int, str)
参见https://docs.python.org/3/library/typing.html#typing.get_origin
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