[issue1574217] isinstance swallows exceptions

[Benjamin Peterson]

Benjamin Peterson <musiccomposition at gmail.com> added the comment:

I'd like to clarify the approach to fixing these types of problems. I
fixed a issue (#2196) like this by only propagating exceptions that
didn't descend from Exception because of this sentence in the hasattr docs:

This is implemented by calling getattr(object, name) and seeing whether
it raises an exception or not.)

However, I like constricting it to AttributeError only as that would
make it much less confusing. This might be something to bring up on
python-dev.

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