code: def _get_iq_handler(self, iq_type, payload):
          
          key = (payload.__class__, payload.handler_key)
          logger.debug("looking up iq {0} handler for {1!r}, key: {2!r}"
                              .format(iq_type, payload, key))
          logger.debug("handlers: {0!r}".format(self._iq_handlers))
          handler = self._iq_handlers[iq_type].get(key)
          return handler
docs: Get an <iq/> handler for given iq  type and payload.