def unsubscribe(self, topic):
        if topic in self.db_subscriptions:
            for (table, notifier) in self.db_subscriptions[topic]:
                self.db.unsubscribe(table, notifier)
            del self.db_subscriptions[topic]
dataset/ETHPy150Open warner/petmail/petmail/web.py/EventChannel.unsubscribe/original