word shifts

[dave]

On 2008-05-04 01:10:40 -0600, Arnaud Delobelle <arnodel at googlemail.com> said:

> dave <squareswallower at invalid.com> writes:
> 
>> Hello,
>> 
>> I made a function that takes a word list (one word per line, text
>> file) and searches for all the words in the list that are 'shifts' of
>> eachother.  'abc' shifted 1 is 'bcd'
>> 
>> Please take a look and tell me if this is a viable solution.
>> 
>> def shift(word, amt):
>> 	ans = ''
>> 	for letter in word:
>> 		ans = ans + chr((ord(letter) - ord('a') + amt) % 26 + ord('a'))
>> 	return ans
> 
> In Python, if you want to build a string from lots of parts you can
> use ''.join(parts).  I think it is considered more efficient.


what would be the best way to write a "ans = ans + chr" into a 
''.join(parts) ??