“long”对象没有属性“\uu getitem”

'02 01 01 21 03 01 02 00 01 20 b6 01 0 26 cd 00 03 30 63 a4 22 01'

def parse_code(msg):
    buf = (hashlib.sha256(bytearray.fromhex(msg)).hexdigest())
    buf = int(buf, 16)

    datetime_now = datetime.now()
    log_date = datetime_now.isoformat()

    try:
        prepare_adress = buf[16:22]
        hex_adress = int(prepare_adress, 16)
        new_adress =hex_adress + 0x200
        adress = hex(new_adress).upper()
        id = buf[4:]
        prepare_usage = buf[1:2]
        hex_usage = int(prepare_usage, 16)
        new_usage =hex_usage + 0x200
        usage = hex(new_usage).upper()
        time_a = int(time())
    except Exception as e: 
        print(e)

你知道如何处理这个错误吗?还有一些关于如何将消息转换成十六进制的更好方法的建议?