Re: xslice idea | a generator slice

References	<4a81b6a6-023e-4d47-9bd0-bbc0516caf6b@googlegroups.com>
From	Ian Kelly <ian.g.kelly@gmail.com>
Date	2013-07-11 10:16 -0600
Subject	Re: xslice idea \| a generator slice
Newsgroups	comp.lang.python
Message-ID	<mailman.4596.1373559441.3114.python-list@python.org> (permalink)

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On Thu, Jul 11, 2013 at 8:52 AM, Russel Walker <russ.pobox@gmail.com> wrote:
> Just some dribble, nothing major.
>
> I like using slices but I also noticed that a slice expression returns a new sequence.
>
> I sometimes find myself using them in a for loop like this:
>
>
> seq = range(10)
> for even in seq[::2]:
>     print even
>
>
> (That's just for an example) But wouldn't it be a bit of a waste if the slice expression returns a whole new list just when all you want to do in this case is iterate over it once?
>
> I suppose you could get around that will a little more code like:
>
>
> seq = range(10)
> for x in xrange(0, len(seq), 2):
>     print seq[x]
>
>
> But it would be nice there was a way to iterate over a 'slice' of sorts, that would act as a generator.

That would be the itertools.islice function.

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Thread

xslice idea | a generator slice Russel Walker <russ.pobox@gmail.com> - 2013-07-11 07:52 -0700
  Re: xslice idea | a generator slice Russel Walker <russ.pobox@gmail.com> - 2013-07-11 07:54 -0700
    Re: xslice idea | a generator slice Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2013-07-11 16:14 +0100
      Re: xslice idea | a generator slice Russel Walker <russ.pobox@gmail.com> - 2013-07-11 09:21 -0700
        Re: xslice idea | a generator slice Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2013-07-11 17:34 +0100
        Re: xslice idea | a generator slice Ian Kelly <ian.g.kelly@gmail.com> - 2013-07-11 12:00 -0600
        Re: xslice idea | a generator slice Fábio Santos <fabiosantosart@gmail.com> - 2013-07-11 20:58 +0100
        Re: xslice idea | a generator slice Ian Kelly <ian.g.kelly@gmail.com> - 2013-07-11 15:02 -0600
  Re: xslice idea | a generator slice Ian Kelly <ian.g.kelly@gmail.com> - 2013-07-11 10:16 -0600

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