[issue45580] argparse.ArgumentParser.add_mutually_exclusive_group : metavar create parenthesis undefined behavior

[paul j3]

paul j3 <ajipanca at gmail.com> added the comment:

The usage formatting is fragile, with many associated bug reports.  Until someone does a major rewrite, it is best to avoid special characters, especially `()` and `[]` in the `dest` or `metavar`.

Usage uses () to encolde mutually_exclusive_groups and [] to mark non-required arguments.  Don't confuse your users (or argparse) with other uses of these characters.

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nosy: +paul.j3

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<https://bugs.python.org/issue45580>
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