Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.python > #30423

Re: data attributes override method attributes?

Path csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!goblin1!goblin.stu.neva.ru!news2.euro.net!newsgate.cistron.nl!newsgate.news.xs4all.nl!post.news.xs4all.nl!not-for-mail
Return-Path <python-python-list@m.gmane.org>
X-Original-To python-list@python.org
Delivered-To python-list@mail.python.org
X-Spam-Status OK 0.006
X-Spam-Evidence '*H*': 0.99; '*S*': 0.00; 'binary': 0.05; 'received:80.91': 0.09; 'received:80.91.229': 0.09; 'received:gmane.org': 0.09; 'received:list': 0.09; 'subject:method': 0.09; 'terry': 0.09; 'received:80.91.229.3': 0.16; 'received:plane.gmane.org': 0.16; 'reedy': 0.16; 'wrote:': 0.17; 'instance': 0.17; 'jan': 0.18; 'simpler': 0.22; 'header:In- Reply-To:1': 0.25; 'header:User-Agent:1': 0.26; 'header:X -Complaints-To:1': 0.28; 'code': 0.31; 'goes': 0.33; 'subject:data': 0.33; 'to:addr:python-list': 0.33; 'especially': 0.35; 'so,': 0.35; 'pm,': 0.35; 'subject:?': 0.35; 'received:org': 0.36; 'subject:: ': 0.38; 'some': 0.38; 'sure': 0.38; 'to:addr:python.org': 0.39; 'where': 0.40; 'header:Received:5': 0.40; '2:02': 0.84; 'received:fios.verizon.net': 0.84; 'why?': 0.84
X-Injected-Via-Gmane http://gmane.org/
To python-list@python.org
From Terry Reedy <tjreedy@udel.edu>
Subject Re: data attributes override method attributes?
Date Fri, 28 Sep 2012 14:26:05 -0400
References <931902e1-570b-4288-bb9b-de711318c5cd@googlegroups.com> <mailman.1338.1348582105.27098.python-list@python.org> <c3fb0a89-abb9-4107-89cd-3f4ee17b40e1@t2g2000pbt.googlegroups.com> <k3sgio$9v$1@ger.gmane.org> <CAPTjJmo9A2_0hjy2RJW+ALAvd4CTmUfOfh8sy7LspSJxdiWPgw@mail.gmail.com> <k3t2di$9f6$1@ger.gmane.org> <CALwzidk+8BftxXffxidEBZn9xwq6bDMAcTa81HYpq8jGfE=BqA@mail.gmail.com> <k3t4gj$ral$1@ger.gmane.org> <5B80DD153D7D744689F57F4FB69AF474166CCB67@SCACMX008.exchad.jpmchase.net>
Mime-Version 1.0
Content-Type text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding 7bit
X-Gmane-NNTP-Posting-Host pool-173-75-251-66.phlapa.fios.verizon.net
User-Agent Mozilla/5.0 (Windows NT 6.1; WOW64; rv:15.0) Gecko/20120824 Thunderbird/15.0
In-Reply-To <5B80DD153D7D744689F57F4FB69AF474166CCB67@SCACMX008.exchad.jpmchase.net>
X-BeenThere python-list@python.org
X-Mailman-Version 2.1.15
Precedence list
List-Id General discussion list for the Python programming language <python-list.python.org>
List-Unsubscribe <http://mail.python.org/mailman/options/python-list>, <mailto:python-list-request@python.org?subject=unsubscribe>
List-Archive <http://mail.python.org/pipermail/python-list/>
List-Post <mailto:python-list@python.org>
List-Help <mailto:python-list-request@python.org?subject=help>
List-Subscribe <http://mail.python.org/mailman/listinfo/python-list>, <mailto:python-list-request@python.org?subject=subscribe>
Newsgroups comp.lang.python
Message-ID <mailman.1578.1348856800.27098.python-list@python.org> (permalink)
Lines 16
NNTP-Posting-Host 2001:888:2000:d::a6
X-Trace 1348856800 news.xs4all.nl 6949 [2001:888:2000:d::a6]:40639
X-Complaints-To abuse@xs4all.nl
Xref csiph.com comp.lang.python:30423

Show key headers only | View raw

On 9/28/2012 2:02 PM, Prasad, Ramit wrote:

> Just to make sure I am following, if you call
> foo.__len__() it goes to the instance code while
> if you do len(foo) it will go to class.__len__()?

len(foo) calls someclass.__len__(foo) where someclass is foo.__class__or 
some superclass.

> If so, why?

Efficiency and perhaps simpler implementation, especially for binary ops.

-- 
Terry Jan Reedy

Back to comp.lang.python | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

data attributes override method attributes? Jayden <jayden.shui@gmail.com> - 2012-09-25 06:41 -0700
  Re: data attributes override method attributes? alex23 <wuwei23@gmail.com> - 2012-09-25 06:52 -0700
  Re: data attributes override method attributes? Peter Otten <__peter__@web.de> - 2012-09-25 16:08 +0200
    Re: data attributes override method attributes? alex23 <wuwei23@gmail.com> - 2012-09-25 07:11 -0700
      Re: data attributes override method attributes? Peter Otten <__peter__@web.de> - 2012-09-25 16:54 +0200
      Re: data attributes override method attributes? Chris Angelico <rosuav@gmail.com> - 2012-09-26 01:03 +1000
      Re: data attributes override method attributes? Ulrich Eckhardt <ulrich.eckhardt@dominolaser.com> - 2012-09-25 16:54 +0200
      Re: data attributes override method attributes? Terry Reedy <tjreedy@udel.edu> - 2012-09-25 15:58 -0400
      Re: data attributes override method attributes? Ian Kelly <ian.g.kelly@gmail.com> - 2012-09-25 14:07 -0600
      Re: data attributes override method attributes? Terry Reedy <tjreedy@udel.edu> - 2012-09-25 16:18 -0400
      Re: data attributes override method attributes? Terry Reedy <tjreedy@udel.edu> - 2012-09-25 16:34 -0400
      RE: data attributes override method attributes? "Prasad, Ramit" <ramit.prasad@jpmorgan.com> - 2012-09-28 18:02 +0000
        Re: data attributes override method attributes? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-09-29 03:20 +0000
      Re: data attributes override method attributes? Ian Kelly <ian.g.kelly@gmail.com> - 2012-09-28 12:25 -0600
      Re: data attributes override method attributes? Terry Reedy <tjreedy@udel.edu> - 2012-09-28 14:26 -0400
    Re: data attributes override method attributes? Thomas Rachel <nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915@spamschutz.glglgl.de> - 2012-09-25 21:52 +0200
  Re: data attributes override method attributes? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-09-25 14:12 +0000

csiph-web