XORing long strings opimization?
__peter__ at web.de
Tue Nov 4 20:50:06 CET 2003
> Oh, didnt notice that as I wrote it. Thanks...
> Anyway, this is how it should be.
> def XOR(s1,s2):
> """ XOR string s1 with s2 """
> output = ""
> # Argument check
> if (type(s1) and type(s2)) != type(""):
> raise TypeError, "Arguments are not strings"
> if len(s1) != len(s2):
> raise ValueError, "Size differs in strings"
> # Xoring
> for i in range(len(s1)):
> output += chr(ord(s1[i]) ^ ord(s2[i]))
> return output
Oops, I missed one:
>>> xor2.XOR(1, "")
Traceback (most recent call last):
File "<stdin>", line 1, in ?
File "xor2.py", line 7, in XOR
if len(s1) != len(s2):
TypeError: len() of unsized object
Did you expect this?
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