Path: csiph.com!usenet.pasdenom.info!gegeweb.org!de-l.enfer-du-nord.net!feeder1.enfer-du-nord.net!newsfeed.eweka.nl!eweka.nl!feeder3.eweka.nl!newsfeed.xs4all.nl!newsfeed6.news.xs4all.nl!xs4all!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; 'exception': 0.03; 'args)': 0.07; 'false.': 0.07; 'null,': 0.07; 'api': 0.09; 'expected.': 0.09; 'here?': 0.09; 'subject:()': 0.09; 'subject:module': 0.09; 'subject:setting': 0.09; 'throw': 0.09; 'throws': 0.09; 'tuple.': 0.09; 'subject:error': 0.11; 'extension': 0.13; 'static': 0.13; '(null,': 0.16; 'from:addr:timgolden.me.uk': 0.16; 'from:name:tim golden': 0.16; 'message-id:@timgolden.me.uk': 0.16; "module's": 0.16; 'null.': 0.16; 'pyobject*': 0.16; 'received:74.55.86': 0.16; 'received:74.55.86.74': 0.16; 'received:smtp.webfaction.com': 0.16; 'received:webfaction.com': 0.16; 'subject: \n ': 0.16; 'subject:exception': 0.16; 'subject:through': 0.16; 'tjg': 0.16; 'url:py3k': 0.16; 'wrote:': 0.17; 'implementing': 0.17; 'module,': 0.17; 'input': 0.18; 'skip:p 30': 0.20; 'doc': 0.22; 'null)': 0.22; 'null;': 0.22; 'idea': 0.24; 'tried': 0.25; 'header:In- Reply-To:1': 0.25; 'header:User-Agent:1': 0.26; 'looks': 0.26; 'appreciated.': 0.26; "doesn't": 0.28; 'skip:( 20': 0.28; 'piece': 0.29; 'function': 0.30; 'error': 0.30; 'url:python': 0.32; 'like:': 0.33; 'null': 0.33; 'received:192.168.100': 0.33; 'to:addr:python-list': 0.33; 'false': 0.35; 'returning': 0.35; 'but': 0.36; 'url:org': 0.36; 'should': 0.36; 'correctly': 0.37; 'why': 0.37; 'subject:: ': 0.38; 'url:docs': 0.38; 'to:addr:python.org': 0.39; 'received:192': 0.39; 'received:192.168': 0.40; 'help': 0.40; 'think': 0.40; 'first': 0.61; 'from:addr:mail': 0.71; 'saw': 0.75; '.....': 0.75; 'happening?': 0.84; 'indicator': 0.91 Date: Thu, 02 Aug 2012 10:06:29 +0100 From: Tim Golden User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:14.0) Gecko/20120713 Thunderbird/14.0 MIME-Version: 1.0 To: Python-list@python.org Subject: Re: C extension module doesn't throw exception after setting error indicator through PyErr_SetString() References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.12 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: 34 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1343898392 news.xs4all.nl 6857 [2001:888:2000:d::a6]:42002 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:26385 On 02/08/2012 09:57, rahul wrote: > I am implementing a C extension module, during this I saw that when I > set the global error indicator and error message through > PyErr_SetString() API and return false. > > But it doesn't throw any error when I tried to check the error > through sys.exc_info() then it returns (NULL, NULL, NULL) tuple. > > When I return NULL through the C extension module's function then it > works correctly and throws the exception as expected. > > The skeleton looks like: > > static PyObject* check(PyObject* sef, PyObject* args) { PyObject* > input = NULL; if (!PyArg_ParseTuple(args, "O", &input)){ return > NULL; } ..... ..... PyErr_SetString(PyExc_Exception, "Throwing Error > through check function"); Py_RETURN_FALSE; } > > Any idea on why this is happening? Any help will be appreciated. Because you're returning False. You should be returning NULL. Which is why it works when you do :) Have a look at the first line of this page: http://docs.python.org/py3k/extending/extending.html#intermezzo-errors-and-exceptions Which piece of documentation led you to think that returning False was the thing to do here? Perhaps there's a doc that needs fixing? TJG