[issue1574217] isinstance swallows exceptions

[Alexander Belopolsky]

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

I don't see it being applied.  Tres Seaver above reports that issue1574217_dont_mask_errors.txt applies cleanly to 2.6 branch, which means that it has not been applied yet.

Someone needs to check if the patch is current for 2.7 and py3k branches to move this forward.

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nosy: +belopolsky
versions:  -Python 2.6, Python 3.1

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