[issue13387] add exact_type argument to assertIsInstance

[Florent Xicluna]

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

At least in the standard library test suite, it should be useful.
When the test is stricter, it catches errors earlier.

I remember when assertIsInstance was made available (issue #7031), we started to rewrite some expressions
  self.assertEqual(type(result), str)
with
  self.assertIsInstance(result, str)

Actually, it means we relaxed the test.
Today, I don't want to use assertIsInstance anymore because I want to check the exact type() of the result.

The attached files list the usage of both in Lib/test/*py:
 - 325 assertIsInstance
 - 234 assert. . .type(. . .)

IMHO, some assertIsInstance can be stricter.
Most of the other type() tests can be replaced with this method.

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keywords: +patch
Added file: http://bugs.python.org/file23663/issue13387_exact_type.diff

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