Path: csiph.com!x330-a1.tempe.blueboxinc.net!usenet.pasdenom.info!news.albasani.net!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 0.000 X-Spam-Evidence: '*H*': 1.00; '*S*': 0.00; 'subject:module': 0.04; 'subject:using': 0.04; 'python:': 0.05; 'typed': 0.07; 'defined.': 0.09; "module's": 0.09; 'namespace': 0.09; 'received:80.91': 0.09; 'received:80.91.229': 0.09; 'received:gmane.org': 0.09; 'received:list': 0.09; 'underlying': 0.09; 'def': 0.13; '"import': 0.16; 'enigma': 0.16; 'kern': 0.16; 'numpy': 0.16; 'subject:function': 0.16; 'subject:versus': 0.16; 'wrote:': 0.16; '>>>': 0.18; 'header:In-Reply-To:1': 0.22; 'statement': 0.23; 'works.': 0.23; 'code': 0.25; 'compiled': 0.25; 'saying': 0.25; 'module': 0.26; 'pm,': 0.26; 'function': 0.27; 'import': 0.27; 'variable': 0.27; 'work.': 0.28; 'example': 0.28; 'interpret': 0.28; 'confused': 0.30; 'defined,': 0.30; 'imported': 0.30; 'error': 0.30; 'subject:?': 0.30; 'quite': 0.31; 'does': 0.32; 'header:User-Agent:1': 0.33; 'to:addr:python-list': 0.33; 'hi,': 0.34; 'header:X-Complaints-To:1': 0.34; 'sequence': 0.36; 'but': 0.37; 'received:org': 0.37; 'getting': 0.37; 'should': 0.38; 'goes': 0.39; 'called': 0.39; 'subject:: ': 0.39; 'to:addr:python.org': 0.40; 'world': 0.62; 'received:86': 0.63; 'our': 0.64; 'believe': 0.65; 'therefore,': 0.68; 'skip:y 20': 0.80; 'eco': 0.91; 'from.': 0.93 X-Injected-Via-Gmane: http://gmane.org/ To: python-list@python.org From: Robert Kern Subject: Re: importing module versus using function? Date: Tue, 31 Jan 2012 15:53:03 +0000 References: <75df179b-e758-4ee7-a37a-744df9459b5c@f14g2000yqe.googlegroups.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Gmane-NNTP-Posting-Host: host86-181-126-85.range86-181.btcentralplus.com User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7; rv:9.0) Gecko/20111222 Thunderbird/9.0.1 In-Reply-To: <75df179b-e758-4ee7-a37a-744df9459b5c@f14g2000yqe.googlegroups.com> 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: 51 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1328025198 news.xs4all.nl 6954 [2001:888:2000:d::a6]:54186 X-Complaints-To: abuse@xs4all.nl Xref: x330-a1.tempe.blueboxinc.net comp.lang.python:19643 On 1/31/12 3:08 PM, gujax wrote: > Hi, > I am confused on this quite bad!! > If I have this typed in interactive python: > >>> import numpy > >>> def dummy(): > y=numpy.arange(1,2,0.1) > return y > > and then >>> s = dummy() >>> s >>> array[1. , 1.1, 1.2........] > > it works. > > But if I have a module called example.py, whose code is > > def dummy(): > y=numpy.arange(1,2,0.1) > return y > > and now if I do the following: > >>> import numpy >> >from example import * >>> s=dummy() > > The above sequence does not work. It gives an error saying global > variable numpy not defined. > > I understand that when I import a module it gets imported after > getting compiled and therefore, the module should > have a statement "import numpy" at its start. > > But what if I just want to use the function 'dummy'? You need to import numpy in dummy.py. When a function needs to look up a name, it goes to the module's namespace in which the function is defined, not one of the many namespaces where the function is called from. -- Robert Kern "I have come to believe that the whole world is an enigma, a harmless enigma that is made terrible by our own mad attempt to interpret it as though it had an underlying truth." -- Umberto Eco