code: def _prepare_to_send_ack(self, path, ack_id):
          'Return function that acknowledges the server'
          return lambda *args: self._ack(path, ack_id, *argsf _prepare_to_send_ack(self, path, ack_id):
          'Return function that acknowledges the server'
          return lambda *args: self._ack(path, ack_id, *args)
docs: Return function that acknowledges the server