@base_api.refresh_cache
    def add_fixed_ip_to_instance(self, context, instance, network_id):
        """Add a fixed IP to the instance from specified network."""
        neutron = get_client(context)
        search_opts = {'network_id': network_id}
        data = neutron.list_subnets(**search_opts)
        ipam_subnets = data.get('subnets', [])
        if not ipam_subnets:
            raise exception.NetworkNotFoundForInstance(
                instance_id=instance.uuid)

        zone = instance.availability_zone % 'compute:%s'
        search_opts = {'device_id': instance.uuid,
                       'device_owner': zone,
                       'network_id': network_id}
        data = neutron.list_ports(**search_opts)
        ports = data['ports']
        for p in ports:
            for subnet in ipam_subnets:
                fixed_ips = p['fixed_ips']
                fixed_ips.append({'subnet_id': subnet['id']})
                port_req_body = {'port': {'fixed_ips': fixed_ips}}
                try:
                    neutron.update_port(p['id'], port_req_body)
                    return self._get_instance_nw_info(context, instance)
                except Exception as ex:
                    msg = ("Unable to update port %(portid)s on subnet "
                           "%(subnet_id)s with failure: %(exception)s")
                    LOG.debug(msg, {'portid': p['id'],
                                    'subnet_id': subnet['id'],
                                    'exception': ex}, instance=instance)

        raise exception.NetworkNotFoundForInstance(
                instance_id=instance.uuid)
dataset/ETHPy150Open BU-NU-CLOUD-SP16/Trusted-Platform-Module-nova/nova/network/neutronv2/api.py/API.add_fixed_ip_to_instance/swapped operands of `%`