Serhiy Storchaka c1c7d8ead9 bpo-40397: Refactor typing._GenericAlias (GH-19719) ...

Make the design more object-oriented.
Split _GenericAlias on two almost independent classes: for special
generic aliases like List and for parametrized generic aliases like List[int].
Add specialized subclasses for Callable, Callable[...], Tuple and Union[...].

2020-05-07 04:09:33 +03:00

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