[issue21773] Fix a NameError in test_enum

[Ethan Furman]

Ethan Furman added the comment:

Right, I had copied that code from test_pydoc which is where 'print_diffs' is defined.

A comment there says to use the now-included functionality in unittest, and some digging in the docs revealed that assertEqual uses diffs by default.

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assignee:  -> ethan.furman
stage:  -> patch review
type: enhancement -> behavior

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21773>
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