Incrementing letters

[Wolfram Kraus]

Duncan Booth wrote:
> Michael wrote:
> 
> 
>>Hi,
>>I've got a string s, and i want to shift all the letters up by one, eg
>>a->b, b->c ........ z->a
>>In c++ i can do this quite simply with
>>
>>if(C == 'z') C='a';
>>else C++;
>>
>>but i can't work out how to do this this in python??
> 
> 
>>>>import string
>>>>upone = string.maketrans(
> 
>     'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ',
>     'bcdefghijklmnopqrstuvwxyzaBCDEFGHIJKLMNOPQRSTUVWXYZA')
> 
>>>>string.translate("I've got a string s....", upone)
> 
> "J'wf hpu b tusjoh t...."
> 
> 
> Note the difference though: the Python code does what you said you wanted, 
> whereas your sample code corrupts punctuation.

Wow, that's quite nice. You really learn something new every day :-)
A minor improvement: Use string.ascii_letters as the first parameter for 
string.maketrans

Wolfram