code: def handle_invalid_value(self, message, exc_info, context):
          # type: (Text, bool, dict) -> Any
          
          raise NotImplementedError(
              'Not implemented in {cls}.'.format(cls=type(self).__name__),
          )
docs: Handles an invalid value.
  
          :param message:
              Error message.
  
          :param exc_info:
              Whether to include output from :py:func:``sys.exc_info``.
  
          :param context:
              Additional context values for the error.