old_contents: # -*- coding: utf-8 -*-
  
  class SpamListsError(Exception):
      '''There was an error during testing a url or host'''
      
  class UnknownCodeError(SpamListsError):
      '''The classification code from the service was not recognized'''
      
  class UnathorizedAPIKeyError(SpamListsError):
      '''The API key used to query the service was not authorized'''
  
new_contents: # -*- coding: utf-8 -*-
  
  class SpamListsError(Exception):
      '''There was an error during testing a url or host'''
      
  class UnknownCodeError(SpamListsError, KeyError):
      '''The classification code from the service was not recognized'''
      
  class UnathorizedAPIKeyError(SpamListsError):
      '''The API key used to query the service was not authorized'''
  
subject: Make UnknownCodeError additionally extend KeyError