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Groups > comp.lang.python > #92574
| Newsgroups | comp.lang.python |
|---|---|
| Date | 2015-06-12 17:39 -0700 |
| References | <mles66$sk2$1@speranza.aioe.org> <201506122034.t5CKYYt0025588@fido.openend.se> <mailman.447.1434152635.13271.python-list@python.org> <e5d750bd-d7e3-4d93-9794-e9f16a4b40bd@googlegroups.com> <mailman.450.1434155212.13271.python-list@python.org> |
| Message-ID | <df28e29a-cbc9-48b9-bf30-8b1f311848c2@googlegroups.com> (permalink) |
| Subject | Re: zip as iterator and bad/good practices |
| From | sohcahtoa82@gmail.com |
On Friday, June 12, 2015 at 5:27:21 PM UTC-7, Chris Angelico wrote: > On Sat, Jun 13, 2015 at 10:02 AM, <sohcahtoa82@gmail.com> wrote: > >> >>> ints = [0, 1, 2, 2, 1, 4, 6, 5, 5] > >> >>> ints[:] = [i for i in ints if not i % 2] > >> >>> ints > >> [0, 2, 2, 4, 6] > >> > >> > >> -- > >> Terry Jan Reedy > > > > On the second line of your final solution, is there any reason you're using `ints[:]` rather than just `ints`? > > If you use "ints = [...]", it rebinds the name ints to the new list. > If you use "ints[:] = [...]", it replaces the entire contents of the > list with the new list. The two are fairly similar if there are no > other references to that list, but the replacement matches the > mutation behaviour of remove(). > > def just_some(ints): > ints[:] = [i for i in ints if not i % 2] > > ChrisA Ah that makes sense. Thanks.
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zip as iterator and bad/good practices Fabien <fabien.maussion@gmail.com> - 2015-06-12 17:00 +0200
Re: zip as iterator and bad/good practices Fabien <fabien.maussion@gmail.com> - 2015-06-12 17:05 +0200
Re: zip as iterator and bad/good practices Ian Kelly <ian.g.kelly@gmail.com> - 2015-06-12 09:26 -0600
Re: zip as iterator and bad/good practices Fabien <fabien.maussion@gmail.com> - 2015-06-12 17:34 +0200
Re: zip as iterator and bad/good practices Fabien <fabien.maussion@gmail.com> - 2015-06-12 17:59 +0200
Re: zip as iterator and bad/good practices Mark Lawrence <breamoreboy@yahoo.co.uk> - 2015-06-12 17:22 +0100
Re: zip as iterator and bad/good practices Laura Creighton <lac@openend.se> - 2015-06-12 22:34 +0200
Re: zip as iterator and bad/good practices Terry Reedy <tjreedy@udel.edu> - 2015-06-12 19:27 -0400
Re: zip as iterator and bad/good practices Terry Reedy <tjreedy@udel.edu> - 2015-06-12 19:43 -0400
Re: zip as iterator and bad/good practices sohcahtoa82@gmail.com - 2015-06-12 17:02 -0700
Re: zip as iterator and bad/good practices Chris Angelico <rosuav@gmail.com> - 2015-06-13 10:26 +1000
Re: zip as iterator and bad/good practices sohcahtoa82@gmail.com - 2015-06-12 17:39 -0700
Re: zip as iterator and bad/good practices jimages <jimages123@gmail.com> - 2015-06-13 13:32 +0800
Re: zip as iterator and bad/good practices Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-06-13 07:17 +0000
Re: zip as iterator and bad/good practices Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2015-06-13 13:48 +0100
Re: zip as iterator and bad/good practices Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-06-13 16:16 +0000
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