paul j3 <ajipa...@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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