[issue7892] refactor "test_dict.py" using new assertRaises context manager.

[Florent Xicluna]

Florent Xicluna <florent.xicluna at gmail.com> added the comment:

Done with r78582 and r78583.

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assignee:  -> flox
resolution:  -> fixed
stage: patch review -> committed/rejected
status: open -> closed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue7892>
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