docs: def deregister_by_uuid(self, event_type, uuid):
          """Remove a single listener bound to event ``event_type``.
  
          :param event_type: deregister listener bound to event_type
          :param uuid: uuid of listener to remove
  
          :returns: if the listener was deregistered
          :rtype: boolean
          """
          with self._lock:
              listeners = self._topics.get(event_type, [])
              for i, listener in enumerate(listeners):
                  if listener.uuid == uuid:
                      listeners.pop(i)
                      return True
              return False