[issue26952] argparse help formatter crashes

[paul j3]

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

https://bugs.python.org/issue29553 deals with a similar problem, the usage display when one mutually exclusive group is embedded in another mutually exclusive group.  In that case, usage is displayed, but with some missing brackets.  

As here there are two issues - the usage formatter is brittle, and groups are not designed for nesting.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue26952>
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