code: def _initialized(self, partitioner):
          
          self._partitioner = partitioner
          self._thimble = Thimble(self.reactor, self.pool,
                                  partitioner, _blocking_partitioner_methods)
          self._state = None
docs: Store the partitioner and reset the internal state.
  
          Now that we successfully got an actual
          :class:`kazoo.recipe.partitioner.SetPartitioner` object, we
          store it and reset our internal ``_state`` to ``None``,
          causing the ``state`` property to defer to the partitioner's
          state.