paul j3 added the comment:
I just found a case where `dest` is `SUPPRESS` - the default subparsers setup.
_SubParsersAction(option_strings=[], dest='==SUPPRESS==', nargs='A...',
...
If I make this Action 'required' (in the current distribution 'subparsers' are
not required - there's a bug/issue for that)
parser._actions[1].required=True
and call the parser without the required subparser argument I should get an
error message. In earlier versions this would have been a non specific,
`error: too few arguments', but the new one tries to name the missing argument,
e.g.
program: error: the following arguments are required: choice
But with SUPPRESS I get a further error as _parse_known_args tries to format
this error message:
C:\Users\paul\Miniconda3\lib\argparse.py in _parse_known_args(self,
arg_strings, namespace)
1991 if required_actions:
1992 self.error(_('the following arguments are required: %s') %
-> 1993 ', '.join(required_actions))
TypeError: sequence item 0: expected str instance, NoneType found
(This error may have been reported elsewhere. This issue is the first one I
found that deals with `dest=argparse.SUPPRESS`.)
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<http://bugs.python.org/issue20430>
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