[Tutor] List exercise

[Anwar.Lorenzo@gmx.net]

> 
> On Friday, February 7, 2003, at 07:30  AM, Anwar.Lorenzo@gmx.net wrote:
> 
> > just hangs when I execute this function.
> >
> > Here's my solution:
> >
> > def exerSize():
> > 	exer = ['spam!', 1, ['Brie', 'Roquefort', 'Pol le Veq'], [1, 2, 3]]
> > 	i = 0
> > 	while i < len(exer):
> > 		len(exer[i])
> > 	i = i + 1
> 
> Hi Anwar,
> 
> I think the reason your program hangs is because you have an infinite 
> loop.  The "while" loop says "while i is less than the length of exer", 
> and since i is zero, this loop is always true, and never stops.  If you 
> were thinking that your i variable would increment on each iteration of 
> the loop (by using "i = i + 1"), the problem is that that line is 
> outside of the loop.  So that line only executes after the loop is done 
> iterating, but because it's an infinite loop, it never stops.
> 
> Try putting that i = i + 1 line inside the while loop and see what your 
> program does.
> 
> while i < len(exer):
>      len(exer[i])
>      i = i + 1       # all you have to do is indent it to line up with 
> the previous line
> 
> 
> 
> Erik
> 
> 
> 
> 
> 
> -- 
> Erik Price
> 
> email: erikprice@mac.com
> jabber: erikprice@jabber.org
> 

I've tried indenting that line (i = i + 1) but I got this error:
Traceback (most recent call last):
  File "<pyshell#2>", line 1, in ?
    exerSize()
  File "<pyshell#1>", line 5, in exerSize
    len(exer[i])
TypeError: len() of unsized object