def unplug_vifs(self, instance, network_info):
        msg = _("VIF unplugging is not supported by the Hyper-V driver.")
        raise NotImplementedError(msg)
Since keys() returns an iterator, this method is helpful in bypassing
dataset/ETHPy150Open openstack/compute-hyperv/hyperv/nova/driver.py/HyperVDriver.unplug_vifs--crossover with--dataset/ETHPy150Open pypa/pip/pip/_vendor/pyparsing.py/ParseResults.haskeys