xslice idea | a generator slice

[Ian Kelly]

On Thu, Jul 11, 2013 at 10:34 AM, Oscar Benjamin
<oscar.j.benjamin at gmail.com> wrote:
> On 11 July 2013 17:21, Russel Walker <russ.pobox at gmail.com> wrote:
>> To confess, this is the second time I've made the mistake of trying to implement generator like functionality of a builtin when there already is on in itertools. Need to start studying that module abit more I think. I'm looking at the docs now and I see there are actually a couple of isomethings().
>
> Your xslice (or mine) would still be better than islice when the step
> size is large; islice has to iterate over all the skipped elements
> which could be wasteful if the input is indexable. Also islice doesn't
> support negative values for start, stop or step which xslice does.

Ah, that's an interesting point.  Of course the corollary to that is
that xslice requires a sequence, not just an iterable.