code: def action(self, verb, args):
          
          if not isinstance(args, (list, set, tuple)):
              raise TypeError("args is unknown type: %s" % type(args))
  
          if verb == 'add':
              response = ({'add': i} for i in self._action_add(args))
          elif verb == 'remove':
              response = ({'remove': i} for i in self._action_remove(args))
          elif verb == 'get':
              response = ({'get': i} for i in self._action_get(args))
          else:
              raise ValueError("Unknown action: %s" % verb)
  
          self.forwarder(response)
docs: Process the described action
  
          Parameters
          ----------
          verb : str, {'add', 'remove', 'get'}
              The specific action to perform
          args : {list, set, tuple}
              Any relevant arguments for the action.
  
          Raises
          ------
          TypeError
              If args is an unrecognized type
          ValueError
              If the action specified is unrecognized
  
          Returns
          -------
          list
              Elements dependent on the action