How can i change the bytes values in python?

Question

I'm learning Python 3 and i'm trying to make a Caesar Cypher Algorithm. I'm taking a string with commandline input and then I want to change the hexa bytes values (I mean add or substract an integer on it) and finally return the modified string.

stringToDecode = "L|k€y+*^*zo‚*€kvsno|*k€om*vo*zk}}*cyvksr"
for i in range(256):
  print('%i: %s' % (i, repr(''.join([chr((ord(c)+i)%256) for c in stringToDecode]))))

Here is what i managed to do atm but it doesn't works really well. Thx a lot for reading! :)

Good lord that is terrible formatting. Please don't make Python look like Perl!! — Adam Smith
– Adam Smith, Commented Jan 21, 2014 at 0:28
Well, sry, Python is kinda new for me, I've always used C/C++/C# before. So feel free to give me some advices if my formatting suck so much ^^. — Coriolis
– Coriolis, Commented Jan 21, 2014 at 0:31
I'm a bit confused on your question. You want to increment the ord() value of each character by the same amount in order to implement a Caesar Cypher, right? — Adam Smith
– Adam Smith, Commented Jan 21, 2014 at 0:43
With my code the result of line 246 is: 246: 'Bra¢o! Tu peu\x10 ¢alider a¢ec le pass Yolaihu\n' . But if I replace the first line by : stringToDecode ='\x4c\x7c\x6b\x80\x79\x2b\x2a\x5e\x7f\x2a\x7a\x6f\x7f\x82\x2a\x80\x6b\x76\x73\x6e\x6f\x7c\x2a\x6b\x80\x6f\x6d\x2a\x76\x6f\x2a\x7a\x6b\x7d\x7d\x2a\x63\x79\x76\x6b\x73\x72\x7f\x14\x0a' (Whitch is exactly the same but in hexa) Then the result is : 246: 'Bravo! Tu peux valider avec le pass Yolaihu\n\x00' Whitch is exactly what i want. — Coriolis
– Coriolis, Commented Jan 21, 2014 at 1:15

jramirez · Accepted Answer · 2014-01-21 00:58:13Z

3

This is a bit easier to read. Remember, you usually spend at least twice as long reading your code than writing it, so why not make it easier to read :).

stringToDecode = "L|k€y+*^*zo‚*€kvsno|*k€om*vo*zk}}*cyvksr"
for i in range(256):
    list_comp = [chr((ord(c)+i)%256) for c in stringToDecode]
    joined_list = ''.join(list_comp)
    new_val = repr(joined_list) # you shouldn't need this
    print('%i: %s' % (i, new_val))

edited Jan 21, 2014 at 0:58

answered Jan 21, 2014 at 0:49

jramirez

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