[issue26988] Add AutoNumberedEnum to stdlib

[Roundup Robot]

Roundup Robot added the comment:

New changeset 7ed7d7f58fcd by Ethan Furman in branch 'default':
Add AutoEnum: automatically provides next value if missing.  Issue 26988.
https://hg.python.org/cpython/rev/7ed7d7f58fcd

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nosy: +python-dev

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<http://bugs.python.org/issue26988>
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