Path: csiph.com!usenet.pasdenom.info!weretis.net!feeder4.news.weretis.net!feeds.phibee-telecom.net!newsfeed.xs4all.nl!newsfeed2.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 0.026 X-Spam-Evidence: '*H*': 0.95; '*S*': 0.00; 'value,': 0.04; 'explicitly': 0.05; 'assign': 0.07; 'guys!': 0.09; 'subject:Why': 0.09; 'python': 0.11; 'def': 0.12; 'jan': 0.12; 'assume': 0.14; 'posted': 0.15; 'doing,': 0.16; 'obviously,': 0.16; 'which,': 0.16; 'subject: ?': 0.16; 'wrote:': 0.18; 'thu,': 0.19; '31,': 0.24; 'example.': 0.24; 'header:In-Reply-To:1': 0.27; 'chris': 0.29; 'am,': 0.29; 'message-id:@mail.gmail.com': 0.30; 'constant': 0.31; 'marc': 0.31; 'fri,': 0.33; "can't": 0.35; 'but': 0.35; 'received:google.com': 0.35; 'version': 0.36; 'changing': 0.37; 'example,': 0.37; 'thank': 0.38; 'needed': 0.38; 'to:addr:python- list': 0.38; 'pm,': 0.38; 'bad': 0.39; 'to:addr:python.org': 0.39; 'called': 0.40; 'tell': 0.60; 'tips': 0.61; 'full': 0.61; "you're": 0.61; 'you.': 0.62; 'complete': 0.62; 'name': 0.63; 'such': 0.63; '30,': 0.65; 'situation': 0.65; 'subject:this': 0.83; 'believe,': 0.84; 'local,': 0.84; 'cutting': 0.91 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :content-type; bh=RlNZjnoSczHK+ifCCE8Cn5xvYdv+cZsHGQwgJ605UVs=; b=FvVMXPjjtWL+xSilNif6/3eUBgRA5yfKvuMZ+36GDTzmF6o9csFKWIiZzSCHK/JEYE CF5bID68QKm3VXbQg8iGdvE1Rg/FmwFkr/BrqvozT17NA09UYyZG50E2gPSGBmF11rBq y9ZrY7lFIFy+PdlCdbIPudTXLIQo9eFDGWrwr9J9epVCIh0gUxR/6Y3flYtGwU4JBrjU hOjbiCxUPDPzf04KMA7A9w6YXBHVODcDN6XZPU3P+S8SVm5XxPb0dyGoeWNofGO/ZqZr cET1zvoY0WBAKYj0PDUSAc0tf2/g+2bLYegPrU7GHTUvrMF+/aynRU+h1qyIaJlf/VDh wCjw== X-Received: by 10.112.136.36 with SMTP id px4mr1074919lbb.46.1391166338034; Fri, 31 Jan 2014 03:05:38 -0800 (PST) MIME-Version: 1.0 In-Reply-To: References: From: Marc Aymerich Date: Fri, 31 Jan 2014 12:05:17 +0100 Subject: Re: Why this throws an UnboundLocalError ? To: "comp.lang.python" Content-Type: text/plain; charset=ISO-8859-1 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: 32 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1391166346 news.xs4all.nl 2870 [2001:888:2000:d::a6]:56094 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:65114 On Thu, Jan 30, 2014 at 11:53 PM, Chris Angelico wrote: > On Fri, Jan 31, 2014 at 9:46 AM, Marc Aymerich wrote: >> GLOBAL = 0 >> >> def update(): >> GLOBAL += 1 > > If you assign to a name, Python makes it local, unless you explicitly > tell it that you want it to be global: > > def update(): > global GLOBAL > GLOBAL += 1 > > But be aware that the ALL_CAPS name conventionally means a constant. > Since you're changing its value, it's not constant (wow! :) ), so > using a name of GLOBAL is a bad idea. (Also, obviously, you want to > name it appropriately to what you're doing, but I assume you called it > this as part of cutting down your example. For which, by the way, > thank you. You posted a complete example, and the full traceback, and > the Python version and platform. That's everything that we need to > help you - it's such a luxury!!) > Thank you very much guys! and for the additional tips Chris. :) I can't believe, all these years using Python and never encountered a situation where I needed to use global ! -- Marc