[issue9253] argparse: optional subparsers

[R. David Murray]

R. David Murray <rdmurray at bitdance.com> added the comment:

See also 9540, which has an alternate proposal (that I don't like as much) for how to handle parser arguments supplied after subparsers are declared.

Reviewing this, I'm now +1 on fixing this *somehow*, since clearly there is an ambiguity here that needs to be resolved.

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<http://bugs.python.org/issue9253>
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