def _sendTopic(self, group):
        """
        Send the topic of the given group to this user, if it has one.
        """
        topic = group.meta.get("topic")
        if topic:
            author = group.meta.get("topic_author") or "<noone>"
            date = group.meta.get("topic_date", 0)
            self.topic(self.name, '#' + group.name, topic)
            self.topicAuthor(self.name, '#' + group.name, author, date)

        Send the topic of the given group to this user, if it has one.
        
stackoverflow/venv/lib/python3.6/site-packages/twisted/words/service.py