[issue2651] Strings passed to KeyError do not round trip

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

Wouldn't it be nice to also store the offending key as a "key" attribute?
Writing key_error.key is a lot intuitive than key_error.args[0] (or is
it key_error.args[1] ? I've already forgotten :-)).

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nosy: +pitrou

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