[issue20848] 3.4 cherry-pick: b637064cc696 Improve enum subclass behavior

[Larry Hastings]

Larry Hastings added the comment:

Why can't you build the docs on your system?  "make html" works for me every time--it even downloads the packages it needs.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20848>
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