[Tutor] IndexError and appending to lists [Was: Re: Need Helpon Assignment]

[Tom Strickland]

Alan,

Now I understand! Thanks again for the explanation!

Alan G wrote:

>> "for" loop as you suggest, the program won't enter the loop unless 
>> "s" is initialized so that it's in "input". How do I do that?
>
>
> for s in input:
>
> means that s takes on each value in input.
> input is your file. Thus s takes on the value of each line in
> the input file. You don't need to initialise s before entering
> the loop as you would with a while loop. Similarly you don't
> need to test for the end of the file, 'for' does all that too.
>
> Take a look at the 'Loops' topic and then the 'Handling Files' topic
> in my tutorial for more info on this.
>
>> Also, near the end of your remarks you say that the code at the 
>> bottom of my program doesn't do anything. It does for me.
>
>
> Lets take a look:
>
>>>> print N
>>>> for i in range(N):
>>>>    T[i]        <-------- This does nothing
>>>>    print T[i]
>>>
>
> The line that simply has the value in it will not do anything.
> It will not print out the value, you need to call print for that
> to happen.
>
>> put in those print statements to verify that the contents of those 
>> variables are what I expected them to be. That's all that mess is for.
>
>
> The debug/test print statements are fine, I was only pointing out
> that one line did nothing, not the entire block.
>
> HTH,
>
> Alan G
> Author of the Learn to Program web tutor
> http://www.freenetpages.co.uk/hp/alan.gauld
>
>