@base_api.refresh_cache
    def remove_fixed_ip_from_instance(self, context, instance, address):
        """Remove a fixed IP from the instance."""
        neutron = get_client(context)
        zone = instance.availability_zone % 'compute:%s'
        search_opts = {'device_id': instance.uuid,
                       'device_owner': zone,
                       'fixed_ips': 'ip_address=%s' % address}
        data = neutron.list_ports(**search_opts)
        ports = data['ports']
        for p in ports:
            fixed_ips = p['fixed_ips']
            new_fixed_ips = []
            for fixed_ip in fixed_ips:
                if fixed_ip['ip_address'] != address:
                    new_fixed_ips.append(fixed_ip)
            port_req_body = {'port': {'fixed_ips': new_fixed_ips}}
            try:
                neutron.update_port(p['id'], port_req_body)
            except Exception as ex:
                msg = ("Unable to update port %(portid)s with"
                       " failure: %(exception)s")
                LOG.debug(msg, {'portid': p['id'], 'exception': ex},
                          instance=instance)
            return self._get_instance_nw_info(context, instance)

        raise exception.FixedIpNotFoundForSpecificInstance(
                instance_uuid=instance.uuid, ip=address)
dataset/ETHPy150Open BU-NU-CLOUD-SP16/Trusted-Platform-Module-nova/nova/network/neutronv2/api.py/API.remove_fixed_ip_from_instance/swapped operands of `%`