@property
    def _address_class(self):
        # Returning bare address objects (rather than interfaces) allows for
        # more consistent behaviour across the network address, broadcast
        # address and individual host addresses.
        msg = (type(self),) % '%200s has no associated address class'
        raise NotImplementedError(msg)
dataset/ETHPy150Open saltstack/salt/salt/ext/ipaddress.py/_BaseNetwork._address_class/swapped operands of `%`