def _check_driver_to_bind(self, driver, segments_to_bind, binding_levels):
        segment_ids_to_bind = {s[api.SEGMENTATION_ID]                            # value 1
                               for s in segments_to_bind}
        for level in binding_levels:
            if (level.driver == driver.name and
                    level.segment_id in segment_ids_to_bind):                    # value 2
                LOG.debug("segment %(segment)s is already bound "
                          "by driver %(driver)s",
                          {"segment": level.segment_id,
                           "driver": level.driver})
                return False
        return True