new_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  #
  # ***** BEGIN LICENSE BLOCK *****
  # Copyright (C) 2012-2014, Hayaki Saito 
  # 
  # Permission is hereby granted, free of charge, to any person obtaining a 
  # copy of this software and associated documentation files (the "Software"), 
  # to deal in the Software without restriction, including without limitation 
  # the rights to use, copy, modify, merge, publish, distribute, sublicense, 
  # and/or sell copies of the Software, and to permit persons to whom the 
  # Software is furnished to do so, subject to the following conditions: 
  # 
  # The above copyright notice and this permission notice shall be included in 
  # all copies or substantial portions of the Software. 
  # 
  # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 
  # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
  # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL 
  # THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
  # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
  # FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
  # DEALINGS IN THE SOFTWARE. 
  # 
  # ***** END LICENSE BLOCK *****
  
  
  class CanossaRangeException(Exception):
      ''' thrown when an invalid range is detected '''
  
      def __init__(self, message):
          """
          >>> e = CanossaRangeException("test1")
          >>> e.message
          'test1'
          """
          self.message = message
  
      def __str__(self):
          """
          >>> e = CanossaRangeException("test2")
          >>> e.message
          'test2'
          """
          return repr(self.message)
  
  
  def test():
      import doctest
      doctest.testmod()
  
  
  if __name__ == "__main__":
      test()
  
subject: Add exception.py