[Tutor] IndexError: string index out of range

[Dragonfirebane at aol.com]

>>>>index = -1
>>>>while index < len(fruit):
>>>>        
>>>>
>...    print [index], '\t', fruit[index]
>...    index = index - 1
>...
>[-1]    a
>[-2]    n
>[-3]    a
>[-4]    n
>[-5]    a
>[-6]    b
>[-7]    Traceback (most recent call last):
>  File "<stdin>", line 2, in ?
>IndexError: string index out of range

len(fruit) is positive and index is negative, so index will always be smaller 
than len(fruit) . . . you want 

>>> index = -1
>>> while abs(index) <= len(fruit):
 print [index], '\t', fruit[index]
 index -= 1


[-1]  a
[-2]  n
[-3]  a
[-4]  n
[-5]  a
[-6]  b

that way, you're comparing the absolute value of index with the length of 
fruit and the loop will end w/o reaching an error


Email: dragonfirebane at aol.com
AIM: singingxduck
Programming Python for the fun of it.
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