[issue29298] argparse fails with required subparsers, un-named dest, and empty argv

[Mathias Ettinger]

Mathias Ettinger <mathias.ettinger at gmail.com> added the comment:

I was just hit by the very same issue and added the following test into `_get_action_name` to work around it:

    elif isinstance(argument, _SubParsersAction):
        return '{%s}' % ','.join(map(str, argument.choices))

I checked #9253 as referenced by paul j3 and like the `argument.name()` approach as well as it's less specific.

Any chance this can be addressed one way or another?

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nosy: +Mathias Ettinger

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<https://bugs.python.org/issue29298>
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