Path: csiph.com!usenet.pasdenom.info!aioe.org!news.stack.nl!newsfeed.xs4all.nl!newsfeed2.news.xs4all.nl!xs4all!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 0.005 X-Spam-Evidence: '*H*': 0.99; '*S*': 0.00; 'operator': 0.03; '*not*': 0.07; 'from:addr:ethan': 0.09; 'from:addr:stoneleaf.us': 0.09; 'from:name:ethan furman': 0.09; 'indeed,': 0.09; 'message- id:@stoneleaf.us': 0.09; 'subject:module': 0.09; 'unittest': 0.09; '~ethan~': 0.09; "','": 0.16; '(given': 0.16; 'argument)': 0.16; 'delimit': 0.16; 'lambda': 0.16; 'merely': 0.16; 'reedy': 0.16; 'wrote:': 0.18; 'bit': 0.19; 'module': 0.19; 'stack': 0.19; '(the': 0.22; '>>>': 0.22; 'header:User-Agent:1': 0.23; 'adds': 0.24; "aren't": 0.24; 'header:In-Reply-To:1': 0.27; 'point': 0.28; "i'm": 0.30; '>>>>': 0.31; 'convenience': 0.31; 'layer': 0.31; 'call.': 0.33; 'but': 0.35; 'opposed': 0.36; 'thanks': 0.36; 'to:addr:python-list': 0.38; 'pm,': 0.38; 'does': 0.39; 'sure': 0.39; 'to:addr:python.org': 0.39; 'read': 0.60; 'received:173': 0.61; 'simply': 0.61; 'back': 0.62; 'more': 0.64; 'situation': 0.65; 'therefore': 0.72; 'comment.': 0.84; 'confusing': 0.84; 'ethan': 0.84; 'furman': 0.84; 'mind:': 0.84; 'springs': 0.84 Date: Wed, 08 Oct 2014 16:35:11 -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: operator module functions References: <54349662$0$12987$c3e8da3$5496439d@news.astraweb.com> <543518a5$0$12989$c3e8da3$5496439d@news.astraweb.com> <543592AE.80807@stoneleaf.us> <1412797764.3704154.176743089.32D63D13@webmail.messagingengine.com> <54359623.8060307@stoneleaf.us> <1412803417.3733140.176776081.0B98584A@webmail.messagingengine.com> <5435B14C.9020907@stoneleaf.us> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit 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: 26 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1412811314 news.xs4all.nl 2909 [2001:888:2000:d::a6]:56915 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:78862 On 10/08/2014 03:46 PM, Terry Reedy wrote: > On 10/8/2014 5:49 PM, Ethan Furman wrote: >> [redirecting back to the list] > >>>>> I'm not sure what situation you would have to type them (as opposed to >>>>> simply a + b) that the operator module would help with. >>>> >>>> unittest springs to mind: >>>> >>>> self.assertRaises(TypeError, op.add, obj1, obj2) >>> >>> Er, my point is, that is not a situation where you would be able to use >>> obj1.__add__ - you'd have to use the operator module *anyway*, and >>> therefore aren't using it just to get the convenience of a non-dunder >>> name. >> >> self.assertRaises(TypeError, lambda x, y: x+y, obj1, obj2) > > That works, but is a bit harder to type (given the import), more confusing to read (the extra ',' that does *not* > delimit an argument) and adds an extra layer to the call stack with each call. The extra layer *could* make a > difference in recursion. Indeed, thanks for the corrections. I was merely replying to the "have to use the operator module anyway" comment. -- ~Ethan~