[issue614557] LookupError etc. need API to get the key

[Guido van Rossum]

Guido van Rossum added the comment:

I think it would be a good idea to revisit this for py3k, but I'm out of
round tuits.  Anyone else want to tackle this?  It should ideally be
done in such a way that non-core object types can also easily raise
these exceptions with the appropriate attributes, both from C and from
Python.

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<http://bugs.python.org/issue614557>
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