Counting the number of elements in a list - help.

[Christophe Delord]

On Thu, 18 Apr 2002 12:32:13 -0700
Jeff Shannon <jeff at ccvcorp.com> wrote:

It could be shorter and smarter like this :

def InRange(sequence, index):
    return 0 <= index < len(sequence)

> In article <a9hu8e$2fg$1 at lumberjack.rand.org>, bmason at rand.org 
> says...
> > I need to know these things; may someone help me out?
> > 
> > 1) a function which returns the number of elements in a list
> > 2) a function which takes a list and an index and returns a zero when that
> > list index is out of range.
> 
> It seems that your problem has been solved, but... just 'cause...
> 
> Your second function could easily be written like this:
> 
> def InRange(sequence, index):
>     try:
>         sequence[index]
>     except IndexError:
>         return 0
>     else:
>         return 1
> 
> (Note that the 'return 1' isn't strictly required to be in an 
> else: clause here, but I think that using else, in this case, is 
> a clearer expression of intent.)
> 
> -- 
> 
> Jeff Shannon
> Technician/Programmer
> Credit International


-- 
Christophe Delord
http://christophe.delord.free.fr/