[issue45110] argparse repeats itself when formatting help metavars

[Forest]

Forest <forestix at sonic.net> added the comment:

To be clear, I wrote those examples to be non-invasive, not patch proposals.
A cleaner approach would be possible if patching argparse is an option.  (I
believe the patch in #42980 proposes such an approach.)

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue45110>
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