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Groups > comp.lang.python > #108211
| From | Chris Angelico <rosuav@gmail.com> |
|---|---|
| Newsgroups | comp.lang.python |
| Subject | Re: Pylint prefers list comprehension over filter... |
| Date | 2016-05-06 12:55 +1000 |
| Message-ID | <mailman.425.1462503307.32212.python-list@python.org> (permalink) |
| References | <572BF2BF.6000000@icloud.com> <1462498631.232041.599637409.25D91C08@webmail.messagingengine.com> <mailman.422.1462498634.32212.python-list@python.org> <ngh0hu$4og$1@dont-email.me> <CAPTjJmqJmkTp85wWZm_GF1gRKSRv5UE7Ck4jZM2NBSwAnFKk-Q@mail.gmail.com> |
On Fri, May 6, 2016 at 12:46 PM, Dan Sommers <dan@tombstonezero.net> wrote: > filter used to build a list, but now it doesn't (where "used to" means > Python 2.7 and "now" means Python 3.5; I'm too lazy to track down the > exact point(s) at which it changed): > > Python 2.7.11+ (default, Apr 17 2016, 14:00:29) > [GCC 5.3.1 20160409] on linux2 > Type "help", "copyright", "credits" or "license" for more information. > >>> filter(lambda x:x+1, [1, 2, 3, 4]) > [1, 2, 3, 4] > > Python 3.5.1+ (default, Apr 17 2016, 16:14:06) > [GCC 5.3.1 20160409] on linux > Type "help", "copyright", "credits" or "license" for more information. > >>> filter(lambda x:x+1, [1, 2, 3, 4]) > <filter object at 0x7f26a9ef3320> Most of these kinds of changes happened in 3.0, where backward-incompatible changes were accepted. A whole bunch of things stopped returning lists and started returning lazy iterables - range, filter/map, dict.keys(), etc - because most of the time, they're iterated over once and then dropped. ChrisA
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Re: Pylint prefers list comprehension over filter... Stephen Hansen <me@ixokai.io> - 2016-05-05 18:37 -0700
Re: Pylint prefers list comprehension over filter... Dan Sommers <dan@tombstonezero.net> - 2016-05-06 02:46 +0000
Re: Pylint prefers list comprehension over filter... Chris Angelico <rosuav@gmail.com> - 2016-05-06 12:55 +1000
Re: Pylint prefers list comprehension over filter... Stephen Hansen <me+python@ixokai.io> - 2016-05-05 19:57 -0700
Re: Pylint prefers list comprehension over filter... Steven D'Aprano <steve@pearwood.info> - 2016-05-06 22:42 +1000
Re: Pylint prefers list comprehension over filter... Dan Sommers <dan@tombstonezero.net> - 2016-05-06 03:07 +0000
Re: Pylint prefers list comprehension over filter... Chris Angelico <rosuav@gmail.com> - 2016-05-06 13:18 +1000
Re: Pylint prefers list comprehension over filter... Christopher Reimer <christopher_reimer@icloud.com> - 2016-05-07 12:37 -0700
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