Python：binascii.a2b_hex 给出“奇数字符串”
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Python: binascii.a2b_hex gives "Odd-length string"
提问by Magicked
I have a hex value that I'm grabbing from a text file, then I'm passing it to a2b_hex to convert it to the proper binary representation. Here is what I have:
我有一个从文本文件中获取的十六进制值，然后我将它传递给 a2b_hex 以将其转换为正确的二进制表示。这是我所拥有的：
k = open('./' + basefile + '.key', 'r')
k1 = k.read()
k.close()
my_key = binascii.a2b_hex(k1)
When I print k1, it is as expected: 81e3d6df
当我打印 k1 时，正如预期的那样：81e3d6df
Here is the error message:
这是错误消息：
Traceback (most recent call last):
File "xor.py", line 26, in <module>
my_key = binascii.a2b_hex(k1)
TypeError: Odd-length string
Any suggestions? Thanks!
有什么建议？谢谢！
采纳答案by Matti Virkkunen
Are you sure the file doesn't have something extra in it? Whitespace, for instance?
您确定该文件中没有其他内容吗？例如，空白？
Try k1.strip()
尝试 k1.strip()
回答by bobince
I suspect there is a trailing newline at the end of the file. Strip the string before passing it to binascii.
我怀疑文件末尾有一个尾随换行符。在将字符串传递给binascii.
Note there's now also a simpler spelling: k1.strip().decode('hex').
请注意，现在还有一个更简单的拼写：k1.strip().decode('hex').
回答by Jim Brissom
I'm more interested what happens if you execute the following code:
我对执行以下代码会发生什么更感兴趣：
with open("./" + basefile + ".key") as key_file:
key = key_file.read()
print len(key), key
Care to tell? There is probably some extra character you just don't see when printing. In these cases, make sure to print the length of the string.
介意告诉吗？可能有一些您在打印时看不到的额外字符。在这些情况下，请确保打印字符串的长度。
回答by Seth
read()doesn't strip newlines. If there's a '\n'at the end of your file, it'll be in k1.
read()不去除换行符。如果'\n'文件末尾有 ，它将在k1.
Try binascii.a2b_hex(k1.strip())or possibly binascii.a2b_hex(k1[:8]).
尝试binascii.a2b_hex(k1.strip())或可能binascii.a2b_hex(k1[:8])。
