#!/usr/bin/env python
     # encoding: utf-8
     #
     # Copyright (c) 2008 Doug Hellmann All rights reserved.
     #
     """
     """
     #end_pymotw_header
     
     import warnings
     
     warnings.simplefilter('once', UserWarning)
     
     warnings.warn('This is a warning!')
     warnings.warn('This is a warning!')
     warnings.warn('This is a warning!')