On 2019-08-09 17:06, Larry Martell wrote:
I have some python 2 code:

def decode(key, string):
        decoded_chars = []
        string = base64.urlsafe_b64decode(string)
        for i in range(len(string)):
            key_c = key[i % len(key)]
            encoded_c = chr(abs(ord(string[i]) - ord(key_c) % 256))
            decoded_chars.append(encoded_c)
        decoded_string = "".join(decoded_chars)
        return decoded_string

and if I call it like this in py2 it works as expected:

s = 'V3NYVY95iImnnJWCmqphWFFzU1qvqsV6x83Mxa7HipZitZeMxbe709jJtbfW6Y6blQ=='
key = '!@#$VERYsecRet)('
decode(key, s)

In py3 it fails with

TypeError: ord() expected string of length 1, but int found

I know that in py3 base64.urlsafe_b64decode is returning bytes not
chars and that is what that is happening, and I thought the solution
would be to decode it, but what codec would I use for this?

I'll use the b and u prefixes for clarity.

In Python 2, b'abc'[0] is b'a' and u'abc'[0] is u'a'.

In Python 3, b'abc'[0] is 65 and u'abc'[0] is u'a'.

Using ord on an int raises an exception.
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