code: def execute(self):
          
          try:
              for key, value in self._watched_keys.items():
                  if self.mock_redis.redis.get(self.mock_redis._encode(key)) != value:
                      raise WatchError("Watched variable changed.")
              return [command() for command in self.commands]
          finally:
              self._reset()
docs: Execute all of the saved commands and return results.