[issue13387] add exact_type argument to assertIsInstance

[Michael Foord]

Michael Foord <michael at voidspace.org.uk> added the comment:

I think your proposed workaround is good enough and no extra effort to type than the suggested change to assertIsInstance.

-1 on a new method

I think the behaviour of isinstance is clear enough that people who misunderstand what assertIsInstance is doing have a problem with basic Python - and will continue to make the mistake whatever we do to assertIsInstance.

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<http://bugs.python.org/issue13387>
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