Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.python > #61713

Re: Optimizing list processing

Path csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!eu.feeder.erje.net!newsfeed.fsmpi.rwth-aachen.de!newsfeed.kamp.net!newsfeed.kamp.net!feeder1.cambriumusenet.nl!feed.tweaknews.nl!194.109.133.83.MISMATCH!newsfeed.xs4all.nl!newsfeed4.news.xs4all.nl!xs4all!newsgate.cistron.nl!newsgate.news.xs4all.nl!post.news.xs4all.nl!not-for-mail
Return-Path <rosuav@gmail.com>
X-Original-To python-list@python.org
Delivered-To python-list@mail.python.org
X-Spam-Status OK 0.011
X-Spam-Evidence '*H*': 0.98; '*S*': 0.00; 'mrab': 0.05; 'assignment': 0.07; 'try:': 0.09; 'from:addr:rosuav': 0.16; 'from:name:chris angelico': 0.16; 'table)': 0.16; 'tweak': 0.16; 'wrote:': 0.18; 'trying': 0.19; 'split': 0.19; 'version.': 0.19; 'to:name:python- list@python.org': 0.22; 'header:In-Reply-To:1': 0.27; 'am,': 0.29; 'dec': 0.30; 'subject:list': 0.30; 'message-id:@mail.gmail.com': 0.30; '13,': 0.31; 'fri,': 0.33; 'could': 0.34; 'received:google.com': 0.35; 'thanks': 0.36; 'to:addr:python- list': 0.38; 'that,': 0.38; 'does': 0.39; 'to:addr:python.org': 0.39; "you're": 0.61; '2013': 0.98
DKIM-Signature v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=pWa2iia+6sSTmLAhRwgUpB2+zU7XyyPGlfWDyeHBGQk=; b=kaYYVyF9yvp6W3vP1ptTtqB2UYZDuZfm+SRWA2SbRrEaPPAOaX3mGBdiVAZbrXB3ZG foGFYhzhl+kNXlOPHCOdr5WMUbr9ICWLrmBSXWbEyK/IMUHKZXJ+I7tmc5wTZQS9NirU S26pirskAyuxMCKFjAvwyKe4TP1hHrwnceqpQtEYGhV02rWO49zcWaAbhmduA/hU6UUP BLYD5WdaJ6pRTcqdB36dZf4tCoJHRhRNxbk0pZ5uQ/1fvcGDRMrkEsb+6pKnAWNE06VG cmiYuUGVinQvgK3VEz8omUF9hn+3BoPSfRb5/tMEvyNeNxSm46CovRTNMwRWyr7qEPfy N58Q==
MIME-Version 1.0
X-Received by 10.68.196.193 with SMTP id io1mr12654485pbc.46.1386857193352; Thu, 12 Dec 2013 06:06:33 -0800 (PST)
In-Reply-To <52A9BADB.7030701@mrabarnett.plus.com>
References <52a8fb2d$0$29992$c3e8da3$5496439d@news.astraweb.com> <mailman.3953.1386815228.18130.python-list@python.org> <52a9a75a$0$29992$c3e8da3$5496439d@news.astraweb.com> <CAPTjJmqQu57xErByF6f6PtsCmq66c2M=xUQBbXZpS3A=exHcsA@mail.gmail.com> <52A9BADB.7030701@mrabarnett.plus.com>
Date Fri, 13 Dec 2013 01:06:33 +1100
Subject Re: Optimizing list processing
From Chris Angelico <rosuav@gmail.com>
To "python-list@python.org" <python-list@python.org>
Content-Type text/plain; charset=UTF-8
X-BeenThere python-list@python.org
X-Mailman-Version 2.1.15
Precedence list
List-Id General discussion list for the Python programming language <python-list.python.org>
List-Unsubscribe <https://mail.python.org/mailman/options/python-list>, <mailto:python-list-request@python.org?subject=unsubscribe>
List-Archive <http://mail.python.org/pipermail/python-list/>
List-Post <mailto:python-list@python.org>
List-Help <mailto:python-list-request@python.org?subject=help>
List-Subscribe <https://mail.python.org/mailman/listinfo/python-list>, <mailto:python-list-request@python.org?subject=subscribe>
Newsgroups comp.lang.python
Message-ID <mailman.3991.1386857197.18130.python-list@python.org> (permalink)
Lines 12
NNTP-Posting-Host 2001:888:2000:d::a6
X-Trace 1386857197 news.xs4all.nl 2923 [2001:888:2000:d::a6]:43997
X-Complaints-To abuse@xs4all.nl
Xref csiph.com comp.lang.python:61713

Show key headers only | View raw

On Fri, Dec 13, 2013 at 12:32 AM, MRAB <python@mrabarnett.plus.com> wrote:
>> table[:] = [i for x,i in table]  # Does slice assignment get optimized?
>>
> [snip]
>
> If you're trying that, you could also try:
>
> table[:] = (i for x,i in table)

Right, a tweak which could be applied also to the split version. Thanks MRAB.

ChrisA

Back to comp.lang.python | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

Optimizing list processing Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-12-11 23:54 +0000
  Re: Optimizing list processing MRAB <python@mrabarnett.plus.com> - 2013-12-12 00:59 +0000
    Re: Optimizing list processing Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-12-12 01:43 +0000
      Re: Optimizing list processing MRAB <python@mrabarnett.plus.com> - 2013-12-12 02:09 +0000
  Re: Optimizing list processing duncan smith <buzzard@invalid.invalid> - 2013-12-12 01:02 +0000
  Re: Optimizing list processing Ben Finney <ben+python@benfinney.id.au> - 2013-12-12 12:18 +1100
  Re: Optimizing list processing Terry Reedy <tjreedy@udel.edu> - 2013-12-11 21:26 -0500
    Re: Optimizing list processing Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-12-12 12:08 +0000
      Re: Optimizing list processing Chris Angelico <rosuav@gmail.com> - 2013-12-12 23:25 +1100
      Re: Optimizing list processing MRAB <python@mrabarnett.plus.com> - 2013-12-12 13:32 +0000
      Re: Optimizing list processing Chris Angelico <rosuav@gmail.com> - 2013-12-13 01:06 +1100
      Re: Optimizing list processing Terry Reedy <tjreedy@udel.edu> - 2013-12-12 13:40 -0500
        Re: Optimizing list processing Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-12-13 00:14 +0000
          Re: Optimizing list processing Chris Angelico <rosuav@gmail.com> - 2013-12-13 12:01 +1100
  Re: Optimizing list processing Stefan Behnel <stefan_ml@behnel.de> - 2013-12-12 12:09 +0100
  Re: Optimizing list processing Peter Otten <__peter__@web.de> - 2013-12-12 16:08 +0100
    Re: Optimizing list processing Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-12-13 03:01 +0000
      Re: Optimizing list processing rusi <rustompmody@gmail.com> - 2013-12-12 21:35 -0800
  Re: Optimizing list processing Terry Reedy <tjreedy@udel.edu> - 2013-12-12 13:07 -0500

csiph-web