[issue10221] {}.pop('a') raises non-standard KeyError exception

[Alexander Belopolsky]

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

There have been several requests for KeyError to grow "key" attribute that will always contain the key that caused the error. See issue 1182143, for example.  If this is done, I think it would be natural to unify the args as well for empty and non-empy case.  Without adding key access API, however, I am at most -0 on changing the error message.   Traditionally, the error messages are not considered part of language specification, so this is not a bug.

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nosy: +belopolsky
type: behavior -> feature request
versions:  -Python 2.7, Python 3.1

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<http://bugs.python.org/issue10221>
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