def ack(self, tup):
tup_id = tup.id if isinstance(tup, Tuple) else tup<EOL>self.send_message({"<STR_LIT>": "<STR_LIT>", "<STR_LIT:id>": tup_id})<EOL>
Indicate that processing of a Tuple has succeeded.

        :param tup: the Tuple to acknowledge.
        :type tup: :class:`str` or :class:`pystorm.component.Tuple`