Path: csiph.com!x330-a1.tempe.blueboxinc.net!usenet.pasdenom.info!weretis.net!feeder4.news.weretis.net!newsreader4.netcologne.de!news.netcologne.de!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 0.002 X-Spam-Evidence: '*H*': 1.00; '*S*': 0.00; 'value,': 0.04; 'cpython': 0.05; 'compiler': 0.07; 'deliberately': 0.09; 'global,': 0.09; 'def': 0.13; "'as'": 0.16; 'general.': 0.16; 'scope.': 0.16; 'subject:Overriding': 0.16; 'subject:global': 0.16; 'to:addr:pearwood.info': 0.16; 'to:addr:steve+comp.lang.python': 0.16; "to:name:steven d'aprano": 0.16; 'cc:addr:python-list': 0.16; 'mon,': 0.16; 'language': 0.17; 'wrote:': 0.18; 'seems': 0.20; 'cc:no real name:2**0': 0.20; 'trying': 0.21; 'dec': 0.22; "doesn't": 0.22; 'header:In-Reply-To:1': 0.22; '+0100,': 0.23; 'globally': 0.23; 'cc:2**0': 0.24; 'changes,': 0.24; 'function': 0.27; 'code,': 0.27; 'asking': 0.28; 'true,': 0.29; 'cc:addr:python.org': 0.29; 'pm,': 0.29; 'skip:g 40': 0.30; 'propose': 0.32; 'objects': 0.32; 'idea': 0.32; 'header:User- Agent:1': 0.33; 'too': 0.34; 'presence': 0.36; 'but': 0.37; 'received:192': 0.37; 'think': 0.37; 'using': 0.38; 'steven': 0.38; "it's": 0.40; 'received:192.168': 0.40; '2011': 0.61; 'making': 0.67; 'care': 0.71; 'header:Reply-To:1': 0.71; 'reply- to:no real name:2**0': 0.72; 'trick.': 0.84; 'unique.': 0.84; 'technique': 0.93 Date: Mon, 12 Dec 2011 16:43:54 -0500 From: Dave Angel User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.23) Gecko/20110922 Thunderbird/3.1.15 MIME-Version: 1.0 To: Steven D'Aprano Subject: Re: Overriding a global References: <4ee671f6$0$29979$c3e8da3$5496439d@news.astraweb.com> In-Reply-To: <4ee671f6$0$29979$c3e8da3$5496439d@news.astraweb.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Provags-ID: V02:K0:39j6Cj6usZ3/71UCfmDmsXsmAa3JSmpxcwzNaMUcgHZ YQwsbdfXuo8D1ZNIO++yZN31F0f3G46Rc3AiXqIVUPiM/cl/L9 fIpD7bONyHK2BUuMTm6ghpV9gcUexqOpg/uGYsy0Hdzp0m4NUA 3PY/MWuSeeeLC72Y7ZOG0nWqr2n7dc7PQ8bLsRKxrzFLYguOf+ et1XbXei5OWpIhD+DCnz5TMduzT28oM4R5Ngp06tyqgij/5ZXM pTxKIpH/1JiGcjnrSRqyb+ODwb6t1tKQIQKzKtoUxMSDeZXfWk Ot3hjq1H4tpUAfQC4qpNGEAoOQMY2QmhtKYHNC87jN59VpFPaM XkGw+tRY12MErYQjxQps= Cc: python-list@python.org X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.12 Precedence: list Reply-To: d@davea.name 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: 27 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1323726243 news.xs4all.nl 6875 [2001:888:2000:d::a6]:33193 X-Complaints-To: abuse@xs4all.nl Xref: x330-a1.tempe.blueboxinc.net comp.lang.python:17083 On 12/12/2011 04:28 PM, Steven D'Aprano wrote: > On Mon, 12 Dec 2011 12:13:33 +0100, Jean-Michel Pichavant wrote: > >> Using the same name for 2 different objects is a bad idea in general. > We have namespaces precisely so you don't need to care about making names > globally unique. > > True, but in this code, the function is trying to both use the global value, but also a local that deliberately has the same name, but a different meaning and "value". The CPython compiler doesn't make this easy, and I think the globals() technique is unnecessarily obscure, as is the default-argument trick. If a function knows of the presence of a global, it's not asking too much for it to not re-use the same name in local scope. Since it seems to be in vogue to propose language changes, how about a new place for 'as' ? def myfunc(): global logger as g_logger logger = g_logger.debug('stuff').getChild('function') -- DaveA