On 27.05.2014 11:05, Chris Angelico wrote: > On Tue, May 27, 2014 at 6:58 PM, Serhiy Storchaka <storch...@gmail.com> wrote: >> 26.05.14 10:59, raymond.hettinger написав(ла): >>> >>> + result = [(elem, i) for i, elem in zip(range(n), it)] >> >> >> Perhaps it is worth to add simple comment explaining why this is not >> equivalent to just list(zip(it, range(n))). Otherwise it can be >> unintentionally "optimized" in future. >> > > Where is the difference? I'm very much puzzled now. My first thought > was based on differing-length iterables in zip, but the docs say it > stops at the shortest of its args.
Nice puzzle. (elem, i) is not (i, elem), though. Thats really hard to see when not looking at it closely. > > ChrisA > _______________________________________________ > Python-Dev mailing list > Python-Dev@python.org > https://mail.python.org/mailman/listinfo/python-dev > Unsubscribe: > https://mail.python.org/mailman/options/python-dev/j.wielicki%40sotecware.net > _______________________________________________ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
