[issue17947] Code, test, and doc review for PEP-0435 Enum

[Roundup Robot]

Roundup Robot added the comment:

New changeset 1b595399e070 by Benjamin Peterson in branch 'default':
simplify #17947 test with weakrefs
http://hg.python.org/cpython/rev/1b595399e070

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nosy: +python-dev

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<http://bugs.python.org/issue17947>
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