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


Groups > comp.lang.python > #63103

Re: Creating a list with holes

Path csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!eu.feeder.erje.net!news2.arglkargh.de!news.albasani.net!rt.uk.eu.org!newsfeed.xs4all.nl!newsfeed3.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 0.005
X-Spam-Evidence '*H*': 0.99; '*S*': 0.00; 'dan': 0.09; 'similar,': 0.09; 'yeah,': 0.09; 'cc:addr:python-list': 0.11; 'jan': 0.12; '...because': 0.16; 'from:addr:rosuav': 0.16; 'from:name:chris angelico': 0.16; 'key)': 0.16; 'sorting': 0.16; 'sat,': 0.16; 'wrote:': 0.18; 'pointed': 0.19; 'cc:addr:python.org': 0.22; 'cc:2**0': 0.24; 'script': 0.25; 'header:In-Reply-To:1': 0.27; 'subject:list': 0.30; 'message-id:@mail.gmail.com': 0.30; 'fine,': 0.31; 'probably': 0.32; 'subject:with': 0.35; 'received:google.com': 0.35; 'should': 0.36; 'pm,': 0.38; 'good:': 0.84; 'to:none': 0.92
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:cc :content-type; bh=mbWlD3Ym9dqX6e22/3jOyHxINfmf0kWcy7ftE0lS6wk=; b=C+AXFsArKsKu+Vn3VTJC9YfzR8hqiK4pq3Ckx2W/4mlVXgV184ZIFQNo/aYwwiv1Xm UhXT1oFL3ulHvMWhNmN+RsE1cZyS0INodavMvN8kbWSrHf3xT7mspMD1miPnW76a4USU s3eo4cH2V3y1aAIZgcVh9NTKQVb3n2xEzLrQAqqQTPm34oI+pXAUXXmARSDGtwxAhPrJ Ebm4BEE1vb9IskwWmOHsSXOJ27FgUIMwNfks437rzHeiJhB2SCqWVI1Udd1UDiPBdrx3 KeGW+zXgDsiLoWmFUYqBySJ07u5ecxg2SiBgp5idNlxppDRTvz+l1cN7VfbJJ/5UOOY1 bjGw==
MIME-Version 1.0
X-Received by 10.68.108.194 with SMTP id hm2mr100604685pbb.22.1388806736152; Fri, 03 Jan 2014 19:38:56 -0800 (PST)
In-Reply-To <CAGGBd_pu97KPKmSMq0=oG_yU-rGPdfCASJr-Pj9Nk7gA2A47Zw@mail.gmail.com>
References <CACwCsY5P47-dB1NLQTUTQ=0aF6B+-M3y4hCxcUGmcVmHM8=-xQ@mail.gmail.com> <CAPTjJmp+NtGYWE3S3SGjo-xoYC74Exdpci_+x4AUNgqM5=CJNQ@mail.gmail.com> <CAGGBd_ooeJLsW_eoEBbrbiv9zxm_75bvWnO1U8JEj8xOnNwMfQ@mail.gmail.com> <CAPTjJmrbXLQP9gYwpzjQta6Mn78gDBQ39vFfsi7R7+42pMxeCw@mail.gmail.com> <CAGGBd_pu97KPKmSMq0=oG_yU-rGPdfCASJr-Pj9Nk7gA2A47Zw@mail.gmail.com>
Date Sat, 4 Jan 2014 14:38:56 +1100
Subject Re: Creating a list with holes
From Chris Angelico <rosuav@gmail.com>
Cc "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.4881.1388806739.18130.python-list@python.org> (permalink)
Lines 14
NNTP-Posting-Host 2001:888:2000:d::a6
X-Trace 1388806739 news.xs4all.nl 2873 [2001:888:2000:d::a6]:49928
X-Complaints-To abuse@xs4all.nl
Xref csiph.com comp.lang.python:63103

Show key headers only | View raw


On Sat, Jan 4, 2014 at 2:32 PM, Dan Stromberg <drsalists@gmail.com> wrote:
> That is fine, sorting once at then end of a script is a good use of
> sorted(some_dict.keys()).  However, it probably should be pointed out
> that this, while similar, is not so good:
>
> for thing in range(n):
>    for key in sorted(some_dict.keys()):
>       do_something(thing, key)
>
> ...because it's sorting n times.

Oh! Yeah. Yeah, that would be inefficient.

ChrisA

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


Thread

Re: Creating a list with holes Chris Angelico <rosuav@gmail.com> - 2014-01-04 14:38 +1100

csiph-web