[issue1574217] isinstance swallows exceptions

[Alexander Belopolsky]

Alexander Belopolsky <belopolsky at users.sourceforge.net> added the comment:

This looks like a borderline case between a bug and a feature request.  If this is deemed to be a feature, it is not appropriate for 2.x or 3.1.  In any case, I think the first step should be to consider this for py3k branch.

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<http://bugs.python.org/issue1574217>
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