#!/usr/bin/env python
     # encoding: utf-8
     #
     # Copyright (c) 2008 Doug Hellmann All rights reserved.
     #
     """
     """
     #end_pymotw_header
     
     import warnings
     
     def warning_on_one_line(message, category, filename, lineno, file=None, line=None):
         return ' %s:%s: %s:%s' % (filename, lineno, category.__name__, message)
     
     warnings.warn('This is a warning message, before')
     warnings.formatwarning = warning_on_one_line
     warnings.warn('This is a warning message, after')