Serhiy Storchaka added the comment:
I don't know if this was discussed, but as far as enums will be used for
platform depending constants (as ENOENT or AF_UNIX), I think that enums should
be pickled by name, not by value. Here is the __reduce_ex__ implementation:
def __reduce_ex__(self, proto):
if proto < 4:
return getattr, (self.__class__, self._name_)
return self.__class__.__qualname__ + '.' + self._name_
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<http://bugs.python.org/issue20534>
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