def create_net_assoc_precommit(self, context, net_assoc):
        bgpvpns = self.bgpvpn_db.find_bgpvpns_for_network(
            context, net_assoc['network_id'])
        if len(bgpvpns) is not 1:
            raise bgpvpn_ext.BGPVPNNetworkAssocExistsAnotherBgpvpn(
                driver=OPENDAYLIGHT_BGPVPN_DRIVER_NAME,
                network=net_assoc['network_id'],
                bgpvpn=bgpvpns[0]['id'])
dataset/ETHPy150Open openstack/networking-bgpvpn/networking_bgpvpn/neutron/services/service_drivers/opendaylight/odl.py/OpenDaylightBgpvpnDriver.create_net_assoc_precommit/operator `>` -> `is not`