[issue17954] Support creation of extensible enums through metaclass subclassing

[Ethan Furman]

Ethan Furman added the comment:

Make it simpler:

class EnumMeta():
    allow_subclass = False


class MyEnumMeta(EnumMeta):
    allow_subclass = True

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue17954>
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