[issue42501] Improve error messages for argparse choices using enum

[Karthikeyan Singaravelan]

Karthikeyan Singaravelan <tir.karthi at gmail.com> added the comment:

https://bugs.python.org/issue25061 also had some discussion over error message display for enums

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nosy: +xtreak

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue42501>
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