def remove(self, event_key):
        target = event_key.dispatch_target
        stack = [target]
        while stack:
            cls = stack.pop(0)
            stack.extend(cls.__subclasses__())
            if cls in self._clslevel:
                self._clslevel[cls].remove(event_key._listen_fn)
        registry._removed_from_collection(event_key, self)
dataset/ETHPy150Open zzzeek/sqlalchemy/lib/sqlalchemy/event/attr.py/_ClsLevelDispatch.remove/original