Ethan Furman c314e60388 bpo-42901: [Enum] move member creation to __set_name__ (GH-24196) ...

`type.__new__` calls `__set_name__` and `__init_subclass__`, which means
that any work metaclasses do after calling `super().__new__()` will not
be available to those two methods.  In particular, `Enum` classes that
want to make use of `__init_subclass__` will not see any members.

Almost all customization is therefore moved to before the
`type.__new__()` call, including changing all members to a proto member
descriptor with a `__set_name__` that will do the final conversion of a
member to be an instance of the `Enum` class.

2021-01-12 23:47:57 -08:00

116 KiB

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