[issue29103] Make enum.py pep8 compliant

[Roundup Robot]

Roundup Robot added the comment:

New changeset bf6987b93358 by Raymond Hettinger in branch '3.6':
Issue #29103: Remove unused import.  Noticed by Jean-Sebastien Bevilacqua.
https://hg.python.org/cpython/rev/bf6987b93358

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nosy: +python-dev

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<http://bugs.python.org/issue29103>
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