[issue20653] Pickle enums by name

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

To pickle by value, the subclass needs only restore current implementation of __reduce_ex__():

    def __reduce_ex__(self, proto):
        return self.__class__, (self.value,)

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20653>
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