Author Lucas Cimon
Recipients Anthony Sottile, Lucas Cimon, bethard, bskinn, eric.araujo, gregory.p.smith, memeplex, ned.deily, paul.j3, serhiy.storchaka, wolma
Date 2021-05-21.07:22:17
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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:
Date User Action Args
2021-05-21 07:22:18Lucas Cimonsetrecipients: + Lucas Cimon, gregory.p.smith, bethard, ned.deily, eric.araujo, memeplex, paul.j3, serhiy.storchaka, wolma, Anthony Sottile, bskinn
2021-05-21 07:22:18Lucas Cimonsetmessageid: <>
2021-05-21 07:22:17Lucas Cimonlinkissue33109 messages
2021-05-21 07:22:17Lucas Cimoncreate