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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<http://bugs.python.org/issue11588>
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