[Tutor] IndexError: string index out of range

[Lloyd Kvam]

Somewhat nit-picking but it is really
	while -len(fruit) <= index < len(fruit):	# valid index values


On Tue, 2004-11-02 at 09:03, Dragonfirebane at aol.com wrote:
> >>>>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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-- 
Lloyd Kvam
Venix Corp