Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!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: X-Original-To: python-list@python.org Delivered-To: python-list@mail.python.org X-Spam-Status: OK 0.012 X-Spam-Evidence: '*H*': 0.98; '*S*': 0.00; 'indicating': 0.07; 'subject:code': 0.07; 'happen.': 0.09; 'hour.': 0.09; 'wrong,': 0.09; 'cc:addr:python-list': 0.11; 'backwards': 0.16; 'clock.': 0.16; 'from:addr:rosuav': 0.16; 'from:name:chris angelico': 0.16; 'jumps': 0.16; 'url:post': 0.16; 'utc': 0.16; 'subject:python': 0.16; 'wrote:': 0.18; "hasn't": 0.19; 'cc:addr:python.org': 0.22; 'certainly': 0.24; "shouldn't": 0.24; 'cc:2**0': 0.24; 'least': 0.26; 'header:In-Reply-To:1': 0.27; '[1]': 0.29; 'dec': 0.30; 'message-id:@mail.gmail.com': 0.30; 'clock': 0.31; "d'aprano": 0.31; 'steven': 0.31; 'fri,': 0.33; 'could': 0.34; 'but': 0.35; 'received:google.com': 0.35; 'should': 0.36; 'server': 0.38; 'pm,': 0.38; 'anything': 0.39; 'most': 0.60; 'gone': 0.61; 'year.': 0.61; 'world.': 0.61; 'back': 0.62; 'more': 0.64; 'hour': 0.70; 'kinda.': 0.84; 'to:none': 0.92; '2013': 0.98 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=Q5V83BUxIXm1ELxlT+pfEG1SiL5WI98QYXz9g/z+xl8=; b=lxnjYkal4g5wo2wo/LtvR8kp/Y17tKDwTzItir0nUBApamALUJG348kD39LemcuPIX +KzYrr/10FBFPBdkbjjbyBoKA6J8quJafWahwR7wJ6mlO14k1EFH2IfvbhH2klCfz0zl dVYGcPilONhhAZUxPuHKz6kKEmhEz+voVCELtnMwPlr6w64b5avwtZdGvOkFbMENLlre Um0UGkJxXW8JD/gjCO8dOQc2vmY2zKNp+XwuNUhZj8aS5TnYnqgMtr4Aq1knSVR6L2gY j5ZO6eBBlohnCRNrCuGMxKl+3hPZ30wnvkSY37N442DlPtIbExnc5Kg0fUtT/surOVgd IyQA== MIME-Version: 1.0 X-Received: by 10.68.173.132 with SMTP id bk4mr1141910pbc.169.1388119508093; Thu, 26 Dec 2013 20:45:08 -0800 (PST) In-Reply-To: <52bd049d$0$29992$c3e8da3$5496439d@news.astraweb.com> References: <52b782db$0$6599$c3e8da3$5496439d@news.astraweb.com> <52b7a0e4$0$29994$c3e8da3$5496439d@news.astraweb.com> <52bd049d$0$29992$c3e8da3$5496439d@news.astraweb.com> Date: Fri, 27 Dec 2013 15:45:07 +1100 Subject: Re: cascading python executions only if return code is 0 From: Chris Angelico Cc: "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 List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Newsgroups: comp.lang.python Message-ID: Lines: 17 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1388119967 news.xs4all.nl 2893 [2001:888:2000:d::a6]:34351 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:62769 On Fri, Dec 27, 2013 at 3:39 PM, Steven D'Aprano wrote: > Time goes backwards by one hour[1] at least once a year across most of the > world. > > http://infiniteundo.com/post/25509354022/more-falsehoods-programmers-believe-about-time-wisdom > > [1] Unless it's less than an hour. Or more than one hour. Kinda. That should be accompanied by a change in UTC offset, indicating that time hasn't gone backwards, just the clock. Anything that queries the clock in UTC shouldn't see it go backward. But if there's a time server that's misconfigured, and it actually jumps time backward, then yes, you could see NTP change the time back by an hour once a year. It's wrong, but it certainly can happen. ChrisA