[issue2651] Strings passed to KeyError do not round trip

[Ben Doremus]

Ben Doremus <bdoremus at gmail.com> added the comment:

Did this patch die?  I ran into the same issue noted in the SO post.  It's bizarre that KeyError is the only error message to handle things this way.

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nosy: +bdoremus

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<https://bugs.python.org/issue2651>
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