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

[STINNER Victor]

STINNER Victor added the comment:

"It is an interesting question whether or not its value in the exception should be considered a bug."

I consider it as a bug because it is very surprising to have a different key on the error. Attached patch fixes the issue.

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keywords: +patch
versions: +Python 3.4
Added file: http://bugs.python.org/file29788/os_environ_keyerror.patch

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