code: def xrevrange(self, stream, start='+', stop='-', count=None):
          
          if count is not None:
              extra = ['COUNT', count]
          else:
              extra = []
          fut = self.execute(b'XREVRANGE', stream, start, stop, *extra)
          return wait_convert(fut, parse_messages)
docs: Retrieve messages from a stream in reverse order.