Path: csiph.com!news.swapon.de!fu-berlin.de!uni-berlin.de!not-for-mail
From: Peter Otten <__peter__@web.de>
Newsgroups: comp.lang.python
Subject: Re: can't add variables to instances of built-in classes
Date: Mon, 18 Jul 2016 09:38:33 +0200
Organization: None
Lines: 14
Message-ID: <mailman.70.1468827536.2307.python-list@python.org>
References: <4f796d95-0e87-4610-a0a8-1eff07c60ace@googlegroups.com> <nmfqrg$ea7$1@ger.gmane.org> <mailman.63.1468755660.2307.python-list@python.org> <b24bede0-be29-4c45-856e-90e6a63c99d0@googlegroups.com> <578b9e62$0$22141$c3e8da3$5496439d@news.astraweb.com> <3e934f83-2076-407d-b85b-686ecdec6ff8@googlegroups.com> <nmi127$r0e$1@ger.gmane.org>
Mime-Version: 1.0
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: 8Bit
X-Trace: news.uni-berlin.de 7klhOMRJmEPekSBzl38z4AfnHsEPKZUn9YtJzXmWpDug==
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 0.003
X-Spam-Evidence: '*H*': 0.99; '*S*': 0.00; '<>,': 0.07; 'received:80.91': 0.09; 'received:80.91.229': 0.09; 'received:gmane.org': 0.09; 'received:list': 0.09; 'url:github': 0.09; '2016': 0.16; '__slots__': 0.16; 'received:80.91.229.3': 0.16; 'received:dip0.t-ipconnect.de': 0.16; 'received:io': 0.16; 'received:plane.gmane.org': 0.16; 'received:psf.io': 0.16; 'received:t-ipconnect.de': 0.16; 'wrote:': 0.16; 'memory': 0.17; 'example.': 0.18; "shouldn't": 0.18; 'library': 0.20; 'lawrence': 0.22; 'header:User-Agent:1': 0.26; 'header:X-Complaints-To:1': 0.26; 'classes': 0.30; 'you?': 0.30; 'useful': 0.33; "d'aprano": 0.33; 'steven': 0.33; 'something': 0.35; 'but': 0.36; 'there': 0.36; 'monday,': 0.36; 'to:addr:python-list': 0.36; 'subject:: ': 0.37; 'received:org': 0.37; 'does': 0.39; "didn't": 0.39; 'subject:-': 0.39; 'to:addr:python.org': 0.40; 'received:de': 0.40; 'your': 0.60; 'useful.': 0.72; 'increase': 0.73; 'subject:add': 0.91
X-Injected-Via-Gmane: http://gmane.org/
X-Gmane-NNTP-Posting-Host: p57bd8330.dip0.t-ipconnect.de
User-Agent: KNode/4.13.3
X-BeenThere: python-list@python.org
X-Mailman-Version: 2.1.22
Precedence: list
List-Id: General discussion list for the Python programming language <python-list.python.org>
List-Unsubscribe: <https://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: <https://mail.python.org/mailman/listinfo/python-list>, <mailto:python-list-request@python.org?subject=subscribe>
X-Mailman-Original-Message-ID: <nmi127$r0e$1@ger.gmane.org>
X-Mailman-Original-References: <4f796d95-0e87-4610-a0a8-1eff07c60ace@googlegroups.com> <nmfqrg$ea7$1@ger.gmane.org> <mailman.63.1468755660.2307.python-list@python.org> <b24bede0-be29-4c45-856e-90e6a63c99d0@googlegroups.com> <578b9e62$0$22141$c3e8da3$5496439d@news.astraweb.com> <3e934f83-2076-407d-b85b-686ecdec6ff8@googlegroups.com>
Xref: csiph.com comp.lang.python:111595

Lawrence D’Oliveiro wrote:

> On Monday, July 18, 2016 at 3:04:13 AM UTC+12, Steven D'Aprano wrote:
> 
>> __slots__ is not obsolete, but 99% of the time you shouldn't bother with
>> it.
> 
> I find __slots__ very useful. I have them right through my Qahirah classes
> <https://github.com/ldo/qahirah>, for example.

When you remove them, does your library stop working? Is there a significant 
increase of memory consumption? Or is there something I didn't think of that 
makes them useful for you?