[issue13387] add exact_type argument to assertIsInstance

[Florent Xicluna]

Changes by Florent Xicluna <florent.xicluna at gmail.com>:


Added file: http://bugs.python.org/file23662/grep_test_exact_type.log

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue13387>
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