code: def delete_rich_menu(self, rich_menu_id, timeout=None):
          
          self._delete(
              '/v2/bot/richmenu/{rich_menu_id}'.format(rich_menu_id=rich_menu_id),
              timeout=timeout
          )
docs: Call delete rich menu API.
  
          https://developers.line.me/en/docs/messaging-api/reference/#delete-rich-menu
  
          :param str rich_menu_id: ID of an uploaded rich menu
          :param timeout: (optional) How long to wait for the server
              to send data before giving up, as a float,
              or a (connect timeout, read timeout) float tuple.
              Default is self.http_client.timeout
          :type timeout: float | tuple(float, float)