code: def using(self, keyspace=None, connection=None):
          
  
          if connection and self._batch:
              raise CQLEngineException("Cannot specify a connection on model in batch mode.")
  
          clone = copy.deepcopy(self)
          if keyspace:
              from cassandra.cqlengine.models import _clone_model_class
              clone.model = _clone_model_class(self.model, {'__keyspace__': keyspace})
  
          if connection:
              clone._connection = connection
  
          return clone
docs: Change the context on-the-fly of the Model class (keyspace, connection)