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Groups > comp.lang.python > #51480

Re: collections.Counter surprisingly slow

From Serhiy Storchaka <storchaka@gmail.com>
Subject Re: collections.Counter surprisingly slow
Date 2013-07-29 22:37 +0300
References <roy-8C60F5.15590428072013@news.panix.com> <kt51t3$r61$1@ger.gmane.org> <CAN1F8qU9o3Wm43VX0hPXSeYPWY4U73c+xp3q35Z3g664SiZJhA@mail.gmail.com> <CALwzid=ULp_8JeaTJ-VyPHaH7qHdykaqoeqJ8+rcbBgUgNzprA@mail.gmail.com>
Newsgroups comp.lang.python
Message-ID <mailman.5256.1375126808.3114.python-list@python.org> (permalink)

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29.07.13 20:19, Ian Kelly написав(ла):
> On Mon, Jul 29, 2013 at 5:49 AM, Joshua Landau <joshua@landau.ws> wrote:
>> Also, couldn't Counter just extend from defaultdict?
>
> It could, but I expect the C helper function in 3.4 will be faster
> since it doesn't even need to call __missing__ in the first place.

I'm surprised, but the Counter constructor with commented out import of 
this accelerator is faster (at least for some data).

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collections.Counter surprisingly slow Roy Smith <roy@panix.com> - 2013-07-28 15:59 -0400
  Re: collections.Counter surprisingly slow Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-07-28 20:51 +0000
    Re: collections.Counter surprisingly slow Roy Smith <roy@panix.com> - 2013-07-28 17:57 -0400
    Re: collections.Counter surprisingly slow Stefan Behnel <stefan_ml@behnel.de> - 2013-07-29 13:46 +0200
    Re: collections.Counter surprisingly slow Joshua Landau <joshua@landau.ws> - 2013-07-29 13:07 +0100
  Re: collections.Counter surprisingly slow Serhiy Storchaka <storchaka@gmail.com> - 2013-07-29 09:25 +0300
  Re: collections.Counter surprisingly slow Joshua Landau <joshua@landau.ws> - 2013-07-29 12:49 +0100
  Re: collections.Counter surprisingly slow Ian Kelly <ian.g.kelly@gmail.com> - 2013-07-29 11:19 -0600
  Re: collections.Counter surprisingly slow Serhiy Storchaka <storchaka@gmail.com> - 2013-07-29 22:37 +0300
  Re: collections.Counter surprisingly slow Stefan Behnel <stefan_ml@behnel.de> - 2013-07-30 08:39 +0200
  Re: collections.Counter surprisingly slow Stefan Behnel <stefan_ml@behnel.de> - 2013-07-30 08:51 +0200
  Re: collections.Counter surprisingly slow Serhiy Storchaka <storchaka@gmail.com> - 2013-07-30 16:04 +0300

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