def _update(self, other, only_propagate=True):

        for ls in _event_descriptors(other):
            if isinstance(ls, _EmptyListener):
                continue
            getattr(self, ls.name).\
                for_modify(self)._update(ls, only_propagate=only_propagate)
Populate from the listeners in another :class:`_Dispatch`
dataset/ETHPy150Open RoseOu/flasky/venv/lib/python2.7/site-packages/sqlalchemy/event/base.py/_Dispatch._update