code: def get_last(self, keyword, param=None, default=None):
          
          return self.get_param(keyword, param, default)[-1]
docs: Get the parameters for a given keyword, or default if keyword or
          parameter are not present in the configuration.
  
          This finds the last declaration of the given parameter (which is the
          one which takes effect).  If no parameter is given, then the entire
          line is treated as the parameter and returned.
  
          Parameters:
              keyword(str): The keyword name, e.g. 'tinker' or 'driftfile'
              param(str): The parameter name, e.g. 'panic' or 'step'.  If not
                  given, the last definition of that keyword is given.
  
          Returns:
              str or None: The value of the given parameter, or None if not
              found.