def serialize_tail(self):
        head = bytearray(struct.pack(self._PACK_STR, len(self.lsas)))
        try:
            return head + reduce(lambda a, b: a + b,
                                 (lsa.serialize() for lsa in self.lsas))
        except __HOLE__:
            return head
dataset/ETHPy150Open osrg/ryu/ryu/lib/packet/ospf.py/OSPFLSUpd.serialize_tail