John
In python, strings are immutable - you have to create a new string no
matter what you do.
Also, I suspect you meant to say:
>>> alphabet = string.ascii_lowercase
>>> code = alphabet[2:] + alphabet[:2]
I had a similar need recently for a guitar chord generator program I've
been working on. Here is a "shift" function from my utilities module:
def shift(list,num):
'''Shifts sequence "list" by "num" places.
if num is positive, list scrolls forwards,
otherwise, backwards.'''
if abs(num) > len(list):
num=num%len(list) # Use mod to remove full list entry rotations
newlist=list[-num:]+list[:-num]
return newlist
I actually create a new list here, although since lists are mutable, I
could probably just change items in-place. There is very likely
something already in the builtins or the standard library for this, but
I just haven't searched hard enough.
Interesting trap I kept falling into: calling a guitar string a
"string" and then having collisions with the python type of the same
name. Over and over again :)
Regards
Caleb
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