[issue9340] argparse parse_known_args does not work with subparsers

[R. David Murray]

Changes by R. David Murray <rdmurray at bitdance.com>:


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stage: needs patch -> patch review
versions: +Python 3.1 -Python 3.3

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue9340>
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