def pack(self):
        opcode_encoded = int_to_bytes(self.opcode)
        block_num_encoded = int_to_bytes(self.block_num)
        return opcode_encoded + block_num_encoded
Take internal values and return a string satisfying the tftp
dataset/ETHPy150Open dropbox/emmer/emmer/packets.py/AcknowledgementPacket.pack