code: def syncItems(self, client=None, clientId=None):
          
          if client:
              clientId = client.clientIdentifier
          elif clientId is None:
              clientId = X_PLEX_IDENTIFIER
  
          data = self.query(SyncList.key.format(clientId=clientId))
  
          return SyncList(self, data)
docs: Returns an instance of :class:`plexapi.sync.SyncList` for specified client.
  
              Parameters:
                  client (:class:`~plexapi.myplex.MyPlexDevice`): a client to query SyncItems for.
                  clientId (str): an identifier of a client to query SyncItems for.
  
              If both `client` and `clientId` provided the client would be preferred.
              If neither `client` nor `clientId` provided the clientId would be set to current clients`s identifier.