[issue11588] Add "necessarily inclusive" groups to argparse

[paul j3]

paul j3 added the comment:

The addition of a simple decorator to the 'ArgumentParser' class, would simplify registering the tests:

    def crosstest(self, func):
        # decorator to facilitate adding these functions
        name = func.__name__
        self.register('cross_tests', name, func)

which would be used as:

    @parser.crosstest
    def pat_or_suf(parser, seen_actions, *args):
        if 2==len(seen_actions.intersection([a_pat, a_suf])):
            parser.error('only one of PATTERN and SUFFIX allowed')

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue11588>
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