Michael Foord <mich...@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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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue13387>
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