[Python-3000] optimizing [x]range

[Guido van Rossum]

On 7/31/07, skip at pobox.com <skip at pobox.com> wrote:
> Also, bringing it back more on-topic, what should the value of this
> expression be?
>
>     4 in range(0, 10, 3)
>
> That is, are we treating range() as a set or an interval?  Maybe I missed
> earlier messages in this thread where this was discussed, but part of the
> discussion focused on this construct
>
>     0 <= 4 < 10
>
> where there was no option to provide a step size.  Also, this particular
> notation screams out interval, not set, to me.

You missed it -- it should definitely be equivalent to

    4 in list(range(0, 10, 3))

i.e.

    4 in [0, 4, 8]

-- 
--Guido van Rossum (home page: http://www.python.org/~guido/)