

def __init__(self, parent, target_cls):
    if (target_cls not in parent._clslevel):
        parent.update_subclass(target_cls)
    self.parent = parent
    self.parent_listeners = parent._clslevel[target_cls]
    self.name = parent.name

dataset/ETHPy150Open zzzeek/sqlalchemy/lib/sqlalchemy/event/attr.py _EmptyListener.__init__/original