#!/usr/bin/env python
     # encoding: utf-8
     #
     # Copyright (c) 2010 Doug Hellmann.  All rights reserved.
     #
     """Set prefix_chars
     """
     #end_pymotw_header
     
     import argparse
     
     parser = argparse.ArgumentParser(description='Change the option prefix characters',
                                      prefix_chars='-+/',
                                      )
     
     parser.add_argument('-a', action="store_false", default=None,
                         help='Turn A off',
                         )
     parser.add_argument('+a', action="store_true", default=None,
                         help='Turn A on',
                         )
     parser.add_argument('//noarg', '++noarg', action="store_true", default=False)
     
     print parser.parse_args()