code: def to_bytes(self):
          '''
          Return packed byte representation of the UDP header.
          '''
          hdr = struct.pack(RIPv2._PACKFMT, self.command.value, 2)
          routes = b''.join([r.to_bytes() for r in self._routes])
          return hdr + routef to_bytes(self):
          '''
          Return packed byte representation of the UDP header.
          '''
          hdr = struct.pack(RIPv2._PACKFMT, self.command.value, 2)
          routes = b''.join([r.to_bytes() for r in self._routes])
          return hdr + routes
docs: Return packed byte representation of the UDP header.