[issue29030] argparse: choices override metavar

[Raymond Hettinger]

Change by Raymond Hettinger <raymond.hettinger at gmail.com>:


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components: +Documentation -Library (Lib)
versions: +Python 3.10, Python 3.9 -Python 2.7, Python 3.5

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue29030>
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