Path: csiph.com!fu-berlin.de!uni-berlin.de!not-for-mail From: Antoon Pardon Newsgroups: comp.lang.python Subject: Re: Case Statements Date: Wed, 16 Mar 2016 14:38:17 +0100 Lines: 57 Message-ID: References: <30502a2e-0bad-4b0f-a1e8-a2b40b0d7ab9@googlegroups.com> <56E928D4.3000701@rece.vub.ac.be> <56E93ADD.9040500@rece.vub.ac.be> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-Trace: news.uni-berlin.de vHCMGaPF77QlquhEGvrs3g+Z2HMQCEf0nLWBFFFKgBrQ== Return-Path: X-Original-To: python-list@python.org Delivered-To: python-list@mail.python.org X-Spam-Status: OK 0.006 X-Spam-Evidence: '*H*': 0.99; '*S*': 0.00; 'received:134': 0.05; 'nasty': 0.07; 'get.': 0.09; 'statements': 0.09; 'bug': 0.10; 'python': 0.10; 'conditional': 0.16; 'constructs': 0.16; 'enough.': 0.16; 'expression.': 0.16; 'make,': 0.16; 'received:ac.be': 0.16; 'received:io': 0.16; 'received:psf.io': 0.16; 'scripts.': 0.16; 'simulate': 0.16; 'simulated': 0.16; 'switch.': 0.16; 'wrote:': 0.16; 'shell': 0.18; 'language': 0.19; '>>>': 0.20; 'developer': 0.20; 'otherwise,': 0.20; 'parsing': 0.22; 'header:In-Reply-To:1': 0.24; "i've": 0.25; 'header:User- Agent:1': 0.26; "doesn't": 0.26; 'developers': 0.26; 'command': 0.26; 'switch': 0.27; 'used,': 0.27; 'least': 0.27; 'for,': 0.29; 'hash': 0.29; 'unlikely': 0.29; 'raise': 0.29; 'e.g.': 0.30; 'putting': 0.30; 'received:be': 0.30; 'waste': 0.30; 'guess': 0.31; 'core': 0.32; 'table': 0.32; 'generally': 0.32; 'statement': 0.32; 'useful': 0.33; 'languages': 0.34; 'list': 0.34; 'gets': 0.35; 'done': 0.35; 'something': 0.35; 'item': 0.35; 'but': 0.36; 'should': 0.36; 'instead': 0.36; 'there': 0.36; 'to:addr:python- list': 0.36; 'subject:: ': 0.37; 'thought': 0.37; 'list.': 0.37; 'progress': 0.38; 'mailing': 0.38; 'enough': 0.39; 'to:addr:python.org': 0.40; 'where': 0.40; 'mark': 0.40; 'care': 0.60; 'hope': 0.61; 'different': 0.63; 'interest': 0.64; 'six': 0.65; 'soon': 0.65; '>>>>>': 0.66; 'bitten': 0.84; 'pardon': 0.84; 'schreef': 0.84; 'worthwhile.': 0.84; 'have.': 0.93 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: At8LANpg6VaGuA9G/2dsb2JhbABehGEBvCSGDQKCCgEBAQEBAWWEaQEBBCNLChELGAICBRYLAgIJAwIBAgFFEwgCiCOvbItNhAgBAQgCHnyFIoREhQiCNIE6BZMEhE2BUIwxiSOFYo5/YoICGoFKi0wBAQE User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Icedove/38.5.0 In-Reply-To: X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: General discussion list for the Python programming language List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Xref: csiph.com comp.lang.python:105024 Op 16-03-16 om 12:07 schreef Mark Lawrence: > On 16/03/2016 10:52, Antoon Pardon wrote: >> Op 16-03-16 om 10:51 schreef Mark Lawrence: >>> On 16/03/2016 09:35, Antoon Pardon wrote: >>>> Op 16-03-16 om 09:47 schreef Mark Lawrence: >>>>> >>>>>> >>>>>> Same with switch. You can use a hash table etc. to simulate >>>>>> switches, >>>>>> but only if the codeblocks are independent. Otherwise, if-elif >>>>>> chains >>>>>> are the way to go. Command line parsing is a case where switch >>>>>> statements are often used, e.g. in shell scripts. >>>>> >>>>> I've seen at least six different ways of simulating switches, so >>>>> those >>>>> people who want them, can have them. if-elif chains are not >>>>> likely to >>>>> kill any Python programmer. >>>>> >>>>> I have no interest what other languages use switch/case statements >>>>> for, as we've on the PYTHON mailing list. >>>> >>>> There once were multiple ways to simulate a conditional expression. >>>> And it was generally thought that using if else statements instead >>>> of a conditional expression was unlikely to kill any Python >>>> programmer. >>>> >>>> But then one of the core developers was bitten by a nasty bug because >>>> he was using one of those constructs that simulated a conditional >>>> expression and soon enough Python had a conditional expression. >>>> >>>> So I guess those who would like a case statement in Python can >>>> only hope a core developer gets bitten by a nasty bug while using >>>> one of those ways of simulating switches. >>>> >>> >>> So that core developers can waste their time putting something into >>> the language that we've done without for 25 years, yes, that strikes >>> me as extremely worthwhile. >> >> Do you think python should stop progressing? Because all progress >> python wil make, will be done by putting something in the language >> we've done without for 25 years. >> >> That we have done without doesn't contradict it can be useful to have. >> > > Raise the item on the python-ideas mailing list for the umpteenth time > then, and see how far you get. I don't care enough. I do care about people using valid arguments. -- Antoon Pardon