[issue17702] os.environ converts key type from string to bytes in KeyError exception

[R. David Murray]

R. David Murray added the comment:

Well, it is not that it is converting it in the exception, it is that it is converting it in order to do the lookup.  It is an interesting question whether or not its value in the exception should be considered a bug.

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nosy: +r.david.murray

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<http://bugs.python.org/issue17702>
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