Lucas Cimon <lucas.ci...@gmail.com> added the comment:
Sorry, the fix was by Mathias Ettinger:
elif isinstance(argument, _SubParsersAction):
return '{%s}' % ','.join(map(str, argument.choices))
I submitted a PR with this patch and a corresponding unit test:
https://github.com/python/cpython/pull/26278
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<https://bugs.python.org/issue33109>
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