Path: csiph.com!usenet.pasdenom.info!news.etla.org!news.stack.nl!newsfeed.xs4all.nl!newsfeed4.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 0.004 X-Spam-Evidence: '*H*': 0.99; '*S*': 0.00; 'nasty': 0.07; 'cc:addr :python-list': 0.11; 'def': 0.12; 'anyway': 0.14; '"""return': 0.16; 'finney': 0.16; 'from:addr:cs': 0.16; 'from:addr:zip.com.au': 0.16; 'from:name:cameron simpson': 0.16; 'function?': 0.16; 'magic': 0.16; 'message-id:@cskk.homeip.net': 0.16; 'portable': 0.16; 'received:211.29': 0.16; 'received:211.29.132': 0.16; 'received:cskk.homeip.net': 0.16; 'received:homeip.net': 0.16; 'received:optusnet.com.au': 0.16; 'received:syd.optusnet.com.au': 0.16; 'simpson': 0.16; 'squirrel': 0.16; 'stdlib.': 0.16; 'wrote:': 0.18; 'skip:f 30': 0.19; 'stack': 0.19; 'not,': 0.20; 'cc:addr:python.org': 0.22; 'header:User- Agent:1': 0.23; 'cc:2**0': 0.24; 'cc:no real name:2**0': 0.24; 'header:In-Reply-To:1': 0.27; 'function': 0.29; 'appear': 0.29; 'getting': 0.31; "d'aprano": 0.31; 'fine,': 0.31; 'steven': 0.31; 'writes:': 0.31; 'level.': 0.33; 'not.': 0.33; "i'd": 0.34; 'but': 0.35; 'there': 0.35; 'limitations': 0.36; 'received:com.au': 0.36; 'useful': 0.36; 'charset:us-ascii': 0.36; 'so,': 0.37; 'skip:o 20': 0.38; 'ben': 0.38; 'received:211': 0.38; 'little': 0.38; 'either': 0.39; 'skip:u 10': 0.60; 'course.': 0.60; 'black': 0.61; 'content-disposition:inline': 0.62; 'yes': 0.68; 'not:': 0.91; 'walking': 0.91; 'whereas': 0.91; 'technique': 0.93 Date: Fri, 11 Oct 2013 15:36:29 +1100 From: Cameron Simpson To: Ben Finney Subject: Re: Skipping decorators in unit tests MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <7w1u3so4lv.fsf@benfinney.id.au> User-Agent: Mutt/1.5.21 (2010-09-15) References: <7w1u3so4lv.fsf@benfinney.id.au> X-Optus-CM-Score: 0 X-Optus-CM-Analysis: v=2.1 cv=YYGEuWhf c=1 sm=1 tr=0 a=YuQlxtEQCowy2cfE5kc7TA==:117 a=YuQlxtEQCowy2cfE5kc7TA==:17 a=ZtCCktOnAAAA:8 a=PO7r1zJSAAAA:8 a=LcaDllckn3IA:10 a=MIEZmskQDU0A:10 a=kj9zAlcOel0A:10 a=vrnE16BAAAAA:8 a=AS59is4VRK8A:10 a=kZ7UWmmPAAAA:8 a=Muj0lNfy1ZwDQPwsnFEA:9 a=CjuIK1q_8ugA:10 a=pyH5b1fOeEsA:10 Cc: python-list@python.org 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: 30 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1381466200 news.xs4all.nl 15871 [2001:888:2000:d::a6]:55380 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:56644 On 11Oct2013 14:42, Ben Finney wrote: > Cameron Simpson writes: > > On 11Oct2013 02:55, Steven D'Aprano wrote: > > > def undecorate(f): > > > """Return the undecorated inner function from function f.""" > > > return f.func_closure[0].cell_contents > > > > Whereas this feels like black magic. Is this portable to any decorated > > function? If so, I'd have hoped it was in the stdlib. If not: black > > magic. > > What would you expect? The purpose of decorating functions is to do > magic to make it appear as though the original function isn't there any > more. Any technique to getting at that original function anyway is *of > course* going to look like black magic at the implementation level. Sigh. Yes of course. It is no uglier than walking a frame stack etc. But is it reliable? Will it work on any decorated function? If so, fine, and I'd be happy to squirrel it away as a useful standard incantation for something. If not, then it's nasty only-mostly-reliable magic and I either want little to do with it, OR I want to know its specific limitations so I know when to use it and when not. -- Cameron Simpson But pessimism IS realism! - D.L.Bahr