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argparse.add_argument replaces dashes with underscores. If an argument contains another non alphanum character, accessing to it will result to a syntax error.
#! /usr/bin/env python
import argparse
if __name__ == '__main__':
 argParser = argparse.ArgumentParser()
 argParser.add_argument('--foo+', action='store_true')
 arguments = argParser.parse_args()
 print 'getattr foo+: %s' % getattr(arguments, 'foo+') # ok
 print arguments.foo+ # syntax error
The patch replaces every non alnum character with an underscore.