def remove_handler(self, handler):
        if self.handler != handler:
            # TODO: Assert
            return False

        self.handler = None

        # Promote session so session item will live a bit longer
        # after disconnection
        self.promote()
List events from tenant stacks.
dataset/ETHPy150Open mrjoes/tornadio/tornadio/pollingsession.py/PollingSession.remove_handler--crossover with--dataset/ETHPy150Open openstack/rally/rally/plugins/openstack/scenarios/heat/stacks.py/HeatStacks.list_stacks_and_events