code: def shutdown(self, save=False, nosave=False):
          
          if save and nosave:
              raise DataError('SHUTDOWN save and nosave cannot both be set')
          args = ['SHUTDOWN']
          if save:
              args.append('SAVE')
          if nosave:
              args.append('NOSAVE')
          try:
              self.execute_command(*args)
          except ConnectionError:
              # a ConnectionError here is expected
              return
          raise RedisError("SHUTDOWN seems to have failed.")
docs: Shutdown the Redis server.  If Redis has persistence configured,
          data will be flushed before shutdown.  If the "save" option is set,
          a data flush will be attempted even if there is no persistence
          configured.  If the "nosave" option is set, no data flush will be
          attempted.  The "save" and "nosave" options cannot both be set.