Path: csiph.com!usenet.pasdenom.info!weretis.net!feeder1.news.weretis.net!feeder.erje.net!eu.feeder.erje.net!newsfeed.freenet.ag!news2.euro.net!newsgate.cistron.nl!newsgate.news.xs4all.nl!post.news.xs4all.nl!not-for-mail Return-Path: X-Original-To: python-list@python.org Delivered-To: python-list@mail.python.org X-Spam-Status: OK 0.000 X-Spam-Evidence: '*H*': 1.00; '*S*': 0.00; 'subject:: [': 0.03; 'subject:Python': 0.05; 'subject:two': 0.07; 'garbage': 0.09; 'through.': 0.09; 'to)': 0.09; 'to:addr:comp.lang.python': 0.09; 'cc:addr:python-list': 0.10; 'resulting': 0.13; '"in"': 0.16; 'afterwards.': 0.16; 'example?': 0.16; 'iterated': 0.16; 'subject:2.7.3': 0.16; 'subject:between': 0.16; 'subject:these': 0.16; 'variable.': 0.16; 'wrote:': 0.17; 'url:view': 0.18; 'subject:] ': 0.19; 'question.': 0.20; 'thanks.': 0.21; 'cc:2**0': 0.23; 'cc:no real name:2**0': 0.24; 'second': 0.24; 'cc:addr:python.org': 0.25; 'header:In-Reply-To:1': 0.25; 'header :User-Agent:1': 0.26; 'run': 0.28; 'gary': 0.29; 'once,': 0.29; 'once.': 0.29; 'case,': 0.29; 'accessible': 0.33; 'code:': 0.33; 'received:google.com': 0.34; 'list': 0.35; 'pm,': 0.35; 'received:209.85': 0.35; 'but': 0.36; 'url:org': 0.36; 'does': 0.37; 'received:209': 0.37; 'called': 0.39; 'your': 0.60; 'first': 0.61; 'here': 0.65; '2013': 0.84; 'tricky': 0.91 X-Received: by 10.49.75.66 with SMTP id a2mr1126313qew.21.1363571993233; Sun, 17 Mar 2013 18:59:53 -0700 (PDT) Newsgroups: comp.lang.python Date: Sun, 17 Mar 2013 18:59:53 -0700 (PDT) In-Reply-To: Complaints-To: groups-abuse@google.com Injection-Info: glegroupsg2000goo.googlegroups.com; posting-host=70.188.179.16; posting-account=AvekzAoAAABj-TclKcOWQmXwA49MFPGX References: <485a3093-8c07-4d1a-b49e-af32f84f8198@googlegroups.com> User-Agent: G2/1.0 X-Google-Web-Client: true X-Google-IP: 70.188.179.16 MIME-Version: 1.0 Subject: Re: [Python 2.7.3] What's the difference between these two uses of "for"? From: "Yves S. Garret" To: comp.lang.python@googlegroups.com Content-Type: text/plain; charset=ISO-8859-1 Cc: python-list@python.org X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: General discussion list for the Python programming language List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Message-ID: Lines: 30 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1363571995 news.xs4all.nl 6949 [2001:888:2000:d::a6]:36583 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:41383 On Sunday, March 17, 2013 9:18:12 PM UTC-4, Gary Herron wrote: > On 03/17/2013 05:58 PM, Yves S. Garret wrote: > > > N00b question. But here is the code: > > > > > > http://bin.cakephp.org/view/709201806 > > > > > > In the first example, the first for-loop is run and then the list is assigned to the tricky variable. But, what > > > happens in the second example? Does the loop after "in" get run only once or multiple number of times? > > > > Just once. The sorted fn is called just once, and the resulting list is > > iterated through. In your first case, the list is bound to (assigned > > to) a name so it is accessible afterwards. In the second case, it is > > available for garbage collection immediately after the loop finishes. > > > > Gary Herron Gotcha, thanks.