[issue9341] allow argparse subcommands to be grouped

[paul j3]

paul j3 added the comment:

This patch accomplishes this task by adding a  _PseudoGroup class to _SubParsersAction.  It's like the _ChoicesPseudoAction except that it maintains its own _choices_actions list.

It takes advantage of the fact that formatter._format_actions is recursive when it comes to actions in _choices_actions.  In fact it is possible to define groups within groups (not that I would recommend that).

There is one simple test case in test_argparse, similar to the example in this issue.

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keywords: +patch
Added file: http://bugs.python.org/file35733/issue9341_1.patch

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