#!/usr/bin/env python
     # encoding: utf-8
     #
     # Copyright (c) 2010 Doug Hellmann.  All rights reserved.
     #
     """Boolean flags.
     """
     #end_pymotw_header
     
     import optparse
     
     parser = optparse.OptionParser()
     parser.add_option('-t', action='store_true', default=False, dest='flag')
     parser.add_option('-f', action='store_false', default=False, dest='flag')
     
     options, args = parser.parse_args()
     
     print 'Flag:', options.flag