def is_trunk_service_port(port_name):
 return (is_trunk_bridge(port_name) or (port_name[:2] in (tman.TrunkParentPort.DEV_PREFIX, tman.SubPort.DEV_PREFIX)))

def is_trunk_service_port ( port_name ) : return ( is_trunk_bridge ( port_name ) or ( port_name [ : 2 ] in ( tman . TrunkParentPort . DEV_PREFIX , tman . SubPort . DEV_PREFIX ) ) )
true if the port is any of the ports used to realize a trunk .