def serialize_tail(self):
        head = bytearray(struct.pack(self._PACK_STR,
                         addrconv.ipv4.text_to_bin(self.mask),
                         self.hello_interval, self.options, self.priority,
                         self.dead_interval,
                         addrconv.ipv4.text_to_bin(self.designated_router),
                         addrconv.ipv4.text_to_bin(self.backup_router)))
        try:
            return head + reduce(lambda a, b: a + b,
                                 (addrconv.ipv4.text_to_bin(
                                  n) for n in self.neighbors))
        except __HOLE__:
            return head
dataset/ETHPy150Open osrg/ryu/ryu/lib/packet/ospf.py/OSPFHello.serialize_tail