code: def putSubHandler(self, prefix, handler):
          '''Add a sub :class:`RpcHandler` with prefix ``prefix``.
  
          :keyword prefix: a string defining the prefix of the subhandler
          :keyword handler: the sub-handler.
          '''
          self.subHandlers[prefix] = handler
          handler._parent = self
          return self putSubHandler(self, prefix, handler):
          '''Add a sub :class:`RpcHandler` with prefix ``prefix``.
  
          :keyword prefix: a string defining the prefix of the subhandler
          :keyword handler: the sub-handler.
          '''
          self.subHandlers[prefix] = handler
          handler._parent = self
          return self
docs: Add a sub :class:`RpcHandler` with prefix ``prefix``.
  
          :keyword prefix: a string defining the prefix of the subhandler
          :keyword handler: the sub-handler.