Path: csiph.com!usenet.pasdenom.info!gegeweb.org!de-l.enfer-du-nord.net!feeder1.enfer-du-nord.net!feeds.phibee-telecom.net!newsfeed.xs4all.nl!newsfeed5.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 0.000 X-Spam-Evidence: '*H*': 1.00; '*S*': 0.00; 'value,': 0.03; 'unittest': 0.07; 'subject:How': 0.09; 'python': 0.09; 'grep': 0.09; 'itself,': 0.09; 'manuel': 0.09; 'received:80.91': 0.09; 'received:80.91.229': 0.09; 'received:gmane.org': 0.09; 'received:list': 0.09; 'subject:hide': 0.09; 'tuple': 0.09; 'def': 0.10; 'stack': 0.15; '__unittest': 0.16; 'editor,': 0.16; 'err': 0.16; 'err,': 0.16; 'frame,': 0.16; 'received:80.91.229.3': 0.16; 'received:dip.t-dialin.net': 0.16; 'received:plane.gmane.org': 0.16; 'received:t-dialin.net': 0.16; 'wrote:': 0.17; 'documented': 0.17; 'skip': 0.17; '>>>': 0.18; 'module': 0.19; 'code.': 0.20; 'variable': 0.20; 'define': 0.20; 'trace': 0.22; "user's": 0.22; 'skip:_ 20': 0.22; 'header:User-Agent:1': 0.26; 'values': 0.26; 'separate': 0.27; 'header:X-Complaints-To:1': 0.28; 'assert': 0.29; 'behaviour': 0.29; 'source': 0.29; "i'm": 0.29; 'code': 0.31; 'skip:s 30': 0.33; 'curious': 0.33; 'traceback': 0.33; 'to:addr:python-list': 0.33; "can't": 0.34; 'open': 0.35; 'subject:?': 0.35; 'received:org': 0.36; 'but': 0.36; 'stock': 0.36; 'method': 0.36; 'test': 0.36; 'two': 0.37; 'subject:: ': 0.38; 'fact': 0.38; 'to:addr:python.org': 0.39; 'apply': 0.39; 'header:Received:5': 0.40; 'kind': 0.61; 'levels': 0.66; 'banks': 0.71; 'otten': 0.84 X-Injected-Via-Gmane: http://gmane.org/ To: python-list@python.org From: Peter Otten <__peter__@web.de> Subject: Re: How can I hide my stack frames in a TestCase subclass? Date: Fri, 05 Oct 2012 10:12:54 +0200 Organization: None References: <52b17563-966c-46bc-bd77-da29e944c909@googlegroups.com> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8Bit X-Gmane-NNTP-Posting-Host: p5084b0e4.dip.t-dialin.net User-Agent: KNode/4.7.3 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: 44 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1349424768 news.xs4all.nl 6856 [2001:888:2000:d::a6]:49465 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:30787 Manuel Pégourié-Gonnard wrote: > Peter Otten scripsit : > >> David Banks wrote: >> >>> Note that the custom assert method causes a stack trace with two frames, >>> one inside the method itself, whereas the stock unittest method only has >>> one frame, the relevant line in the user's code. How can I apply this >>> frame-hiding behaviour to my own method? >> >> Move MyTestCase in a separate module and define a global variable >> >> __unittest = True >> > Hum, is it documented somewhere? I can't find it in the doc. Also, I'm > curious to know what kind of magic it's using. I took advantage of the fact that Python is open source and had a look into the source code ;) $ cd /usr/lib/python2.7/unittest $ grep frame *.py -C2 ... result.py- result.py- def _is_relevant_tb_level(self, tb): result.py: return '__unittest' in tb.tb_frame.f_globals result.py- ... $ grep _is_relevant_tb_level *.py -C5 result.py- result.py- def _exc_info_to_string(self, err, test): result.py- """Converts a sys.exc_info()-style tuple of values into a string.""" result.py- exctype, value, tb = err result.py- # Skip test runner traceback levels result.py: while tb and self._is_relevant_tb_level(tb): result.py- tb = tb.tb_next result.py- ... And so on. I actually used an editor, not grep -- but you get the idea.