A quick question

[Bruno Desthuilliers]

D'Arcy J.M. Cain a écrit :
> On Wed, 28 May 2008 10:25:01 -0000
> "James" <cobrocks at msn.com> wrote:
>> Hey everyone,
>>
>> I just started using python and cant figure this out, I'm trying to 
>> make a program where someone types in a word and the program gives it 
>> back backwards.  For example if the person puts in "cat" I want the 
>> program to give it back as "tac" and what it does is prints out 3,2,1.  
>> How can I get these integers to print as letters?  This is what I have,
>>
>> word = raw_input("Type a word:")
>> start = len(word)
>>
>> for letter in range(start, 0, -1):
>>     print letter  
> 
> Ignore my previous message.  Too early.  Here is your script:
> 
> word = raw_input("Type a word:")
> for i in range(len(word), 0, -1):
>     print word[i]

Traceback (most recent call last):
   File "<stdin>", line 1, in <module>
IndexError: string index out of range

sequence indices are zero-based, so you want to start at len(word) -1. 
And the range upper limit (second argument) is not included. So you want 
to pass -1 here.