Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!eu.feeder.erje.net!news.albasani.net!rt.uk.eu.org!newsfeed.xs4all.nl!newsfeed3.news.xs4all.nl!xs4all!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 0.002 X-Spam-Evidence: '*H*': 1.00; '*S*': 0.00; 'compact': 0.09; 'from:addr:ethan': 0.09; 'from:addr:stoneleaf.us': 0.09; 'from:name:ethan furman': 0.09; 'message-id:@stoneleaf.us': 0.09; 'subject:design': 0.09; '~ethan~': 0.09; 'python': 0.11; 'burak': 0.16; 'received:69.93': 0.16; 'subject:Language': 0.16; 'wrote:': 0.18; 'meant': 0.20; 'header:User-Agent:1': 0.23; 'this:': 0.26; 'header:In-Reply-To:1': 0.27; 'am,': 0.29; 'assert': 0.31; "d'aprano": 0.31; 'steven': 0.31; 'charset:us-ascii': 0.36; 'to:addr:python-list': 0.38; 'to:addr:python.org': 0.39; 'received:173': 0.61; 'mistakes,': 0.84 Date: Wed, 11 Sep 2013 07:52:12 -0700 From: Ethan Furman User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:16.0) Gecko/20121010 Thunderbird/16.0.1 MIME-Version: 1.0 To: python-list@python.org Subject: Re: Language design References: <522eb795$0$29999$c3e8da3$5496439d@news.astraweb.com> <5230480E.2030406@arskom.com.tr> In-Reply-To: <5230480E.2030406@arskom.com.tr> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - gator3304.hostgator.com X-AntiAbuse: Original Domain - python.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - stoneleaf.us X-BWhitelist: no X-Source: X-Source-Args: X-Source-Dir: X-Source-Sender: ([173.12.184.233]) [173.12.184.233]:55535 X-Source-Auth: ethan+stoneleaf.us X-Email-Count: 6 X-Source-Cap: dG9idWs7dG9idWs7Z2F0b3IzMzA0Lmhvc3RnYXRvci5jb20= 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: , Newsgroups: comp.lang.python Message-ID: Lines: 16 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1378913950 news.xs4all.nl 15958 [2001:888:2000:d::a6]:60861 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:53973 On 09/11/2013 03:38 AM, Burak Arslan wrote: > On 09/10/13 09:09, Steven D'Aprano wrote: >> What design mistakes, traps or gotchas do you think Python has? > > My favourite gotcha is this: > > elt, = elts > > It's a nice and compact way to do both: > > assert len(elts) == 0 Perhaps you meant 'assert len(elts) == 1' ? -- ~Ethan~