python - 类型错误 : Odd-length string when decoding hex string

Question

我已确保字符串已被剥离，但我仍然遇到奇数长度字符串问题。有人可以告诉我我做错了什么吗？

>>> toSend = "FF F9 FF 00 00 FA FF F7 FF F4 FF F6 FF F7 FF F6 FF FD FF 05 00 03 00 06 00 05 00 04 00 06 00 06 00 03 00 FB FF 02 00 0B"
>>> toSend.decode("hex")
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python2.7/encodings/hex_codec.py", line 42, in hex_decode
    output = binascii.a2b_hex(input)
TypeError: Odd-length string
>>> 

Answer 1

字符串中的空格会混淆 decode 方法。如果您删除它们，您的代码将起作用:

>>> toSend = "FF F9 FF 00 00 FA FF F7 FF F4 FF F6 FF F7 FF F6 FF FD FF 05 00 03 00 06 00 05 00 04 00 06 00 06 00 03 00 FB FF 02 00 0B"
>>> toSend.replace(' ', '').decode('hex')
'\xff\xf9\xff\x00\x00\xfa\xff\xf7\xff\xf4\xff\xf6\xff\xf7\xff\xf6\xff\xfd\xff\x05\x00\x03\x00\x06\x00\x05\x00\x04\x00\x06\x00\x06\x00\x03\x00\xfb\xff\x02\x00\x0b'
>>>

或者，如果您必须拥有它们，请使用 str.join 和列表理解:

>>> toSend = "FF F9 FF 00 00 FA FF F7 FF F4 FF F6 FF F7 FF F6 FF FD FF 05 00 03 00 06 00 05 00 04 00 06 00 06 00 03 00 FB FF 02 00 0B"
>>> ' '.join([x.decode('hex') for x in toSend.split()])
'\xff \xf9 \xff \x00 \x00 \xfa \xff \xf7 \xff \xf4 \xff \xf6 \xff \xf7 \xff \xf6 \xff \xfd \xff \x05 \x00 \x03 \x00 \x06 \x00 \x05 \x00 \x04 \x00 \x06 \x00 \x06 \x00 \x03 \x00 \xfb \xff \x02 \x00 \x0b'
>>>