def Create(self, port_pairs):
   return forwarders.Forwarder(port_pairs)
 def Create(self, port_pairs):
     return forwarders.Forwarder(
         forwarders.PortPairs(*[
             forwarders.PortPair(p.local_port, p.remote_port or p.local_port
                                 ) if p else None for p in port_pairs
         ]))