[issue14039] Add "metavar" argument to add_subparsers() in argparse

[Berker Peksag]

Changes by Berker Peksag <berker.peksag at gmail.com>:


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versions: +Python 3.4 -Python 3.3

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue14039>
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