Path: csiph.com!x330-a1.tempe.blueboxinc.net!usenet.pasdenom.info!aioe.org!feeder.news-service.com!news2.euro.net!newsgate.cistron.nl!newsgate.news.xs4all.nl!194.109.133.84.MISMATCH!newsfeed.xs4all.nl!newsfeed5.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 0.001 X-Spam-Evidence: '*H*': 1.00; '*S*': 0.00; 'classes.': 0.05; 'terry': 0.07; 'python': 0.08; '3.x': 0.09; 'callable': 0.09; 'received:80.91': 0.09; 'received:80.91.229': 0.09; 'received:80.91.229.12': 0.09; 'received:gmane.org': 0.09; 'received:list': 0.09; 'received:lo.gmane.org': 0.09; 'tkinter': 0.09; 'pm,': 0.10; '>>>': 0.12; 'wrote:': 0.14; 'documented.': 0.16; 'new-style': 0.16; 'nowhere.': 0.16; 'old-style': 0.16; 'reedy': 0.16; 'use:': 0.16; 'jan': 0.20; 'header:In-Reply-To:1': 0.21; 'subject:problem': 0.22; '(and': 0.25; 'classes': 0.26; 'says': 0.27; 'thanks': 0.28; 'are.': 0.29; 'class.': 0.29; 'class': 0.29; 'this.': 0.31; 'cases': 0.32; 'header:X-Complaints- To:1': 0.32; 'does': 0.33; 'to:addr:python-list': 0.33; "i've": 0.33; '...': 0.34; "i'll": 0.34; 'there': 0.35; 'header:User- Agent:1': 0.35; 'difference': 0.37; 'change': 0.37; 'received:org': 0.38; 'but': 0.38; 'purposes': 0.38; 'subject:: ': 0.38; 'should': 0.39; 'unless': 0.39; 'perhaps': 0.39; 'system.': 0.39; 'header:Mime-Version:1': 0.39; 'to:addr:python.org': 0.39; 'really': 0.40; 'best': 0.60; 'believe': 0.66; 'subject:program': 0.67; 'advantages': 0.77; '10:20': 0.84; 'from.': 0.93 X-Injected-Via-Gmane: http://gmane.org/ To: python-list@python.org From: Terry Reedy Subject: Re: TK program problem Date: Sun, 22 May 2011 17:17:37 -0400 References: <9f91909a-ce08-47dd-81d3-e7cf2edad3b6@h12g2000pro.googlegroups.com> <42561028-39ce-4543-8e3c-b021e3a2b067@34g2000pru.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: rain.gmane.org User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.17) Gecko/20110414 Lightning/1.0b2 Thunderbird/3.1.10 In-Reply-To: <42561028-39ce-4543-8e3c-b021e3a2b067@34g2000pru.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: 38 NNTP-Posting-Host: 82.94.164.166 X-Trace: 1306099067 news.xs4all.nl 49181 [::ffff:82.94.164.166]:32864 X-Complaints-To: abuse@xs4all.nl Xref: x330-a1.tempe.blueboxinc.net comp.lang.python:6008 On 5/21/2011 10:20 PM, bvdp wrote: > >> One of the purposes and advantages of Python 3 is having only one class >> system. Best to always use new-style classes in Python 2.2+ unless you >> understand and need old-style classes (and need should be never for most >> people). >> > > Thanks for this. I'll keep it in mind! > > One thing I really don't understand ... is there a difference between > the old/new forms: > > class foo: > class foo(): > > In cases where I've played with them, they _appear_ to work the same? I believe they are. Same is true in 3.x except that the result in a new-style class. > Also, where does one find the magic that says that for a tkinter class > you should use: > > class foo(object): Perhaps nowhere. It may have been an unintended side-effect of the change in callable check, or intentional but not documented. > Not really sure where "object" comes from. It is the base class of all (new-style) classes. >>> object() -- Terry Jan Reedy