def retrieve_list(self, parsed_args):
        external = '--router:external=True'
        if external not in self.values_specs:
            self.values_specs.append('--router:external=True')
        return super(ListExternalNetwork, self).retrieve_list(parsed_args)
dataset/ETHPy150Open openstack/python-neutronclient/neutronclient/neutron/v2_0/network.py/ListExternalNetwork.retrieve_list/original