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Showing content from https://mail.python.org/pipermail/python-dev/2014-February/132363.html below:

[Python-Dev] Pickling of Enums

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How Enum items should be pickled, by value or by name?

I think that Enum will be used to collect system-depending constants, so 
the value of AddressFamily.AF_UNIX can be 1 on one platform and 2 on 
other. If pickle enums by value, then pickled AddressFamily.AF_INET on 
on platform can be unpickled as AddressFamily.AF_UNIX on other platform. 
This looks weird and contrary to the nature of enums.

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