[Python-ideas] Variations on a loop

[Arnaud Delobelle]

On 30 Aug 2008, at 19:32, Bruce Leban wrote:

>
>
> On Sat, Aug 30, 2008 at 10:56 AM, Arnaud Delobelle <arnodel at googlemail.com 
> > wrote:
>
> Finally, my function works gracefully with nested loops:
>
> for i, i_last in flaglast(items):
>    for j, j_last in flaglast(jtems):
>        ...
>
> without the need for a 'named loop', about which I feel very  
> circumspect.
>
> Unfortunately, your function has to get the N+1st item before the  
> body processes the Nth element so if getting the elements has side  
> effects and the body might break, then this changes the behavior of  
> the loop. With an explicit call to an <is this the last> function,  
> we know exactly when it will peek ahead in the list.
>
> --- Bruce

How do you propose to find out if the item is the last without getting  
the next one?

-- 
Arnaud