code: def get(self, node_id):
          
          if (self._registry[node_id].monotonic_timestamp + self.TIMEOUT) < time.monotonic():
              self._call_event_handlers(self.UpdateEvent(self._registry[node_id],
                                                         self.UpdateEvent.EVENT_ID_OFFLINE))
              del self._registry[node_id]
          return self._registry[node_id]
docs: Args:
              node_id:    Returns an Entry instance for the given node ID.
                          If the requested node ID does not exist, throws KeyError.