Path: csiph.com!usenet.pasdenom.info!aioe.org!news.stack.nl!newsfeed.xs4all.nl!newsfeed2.news.xs4all.nl!xs4all!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 0.011
X-Spam-Evidence: '*H*': 0.98; '*S*': 0.00; 'received:80.91': 0.09; 'received:80.91.229': 0.09; 'received:gmane.org': 0.09; 'received:list': 0.09; 'subject:question': 0.10; 'received:80.91.229.3': 0.16; 'received:plane.gmane.org': 0.16; 'sorting': 0.16; 'subject:class': 0.16; 'whatever,': 0.16; 'wrote:': 0.18; 'header:User-Agent:1': 0.23; 'header:X-Complaints- To:1': 0.27; 'header:In-Reply-To:1': 0.27; 'point': 0.28; 'testing': 0.29; 'am,': 0.29; 'points': 0.29; 'sets': 0.30; 'lines': 0.31; 'faster,': 0.31; 'class': 0.32; 'ordered': 0.36; 'subject:regarding': 0.36; 'entry': 0.36; 'lists.': 0.38; 'to:addr :python-list': 0.38; 'expect': 0.39; 'to:addr:python.org': 0.39; 'received:org': 0.40; 'deleting': 0.60; 'received:173': 0.61; 'received:fios.verizon.net': 0.84
X-Injected-Via-Gmane: http://gmane.org/
To: python-list@python.org
From: Terry Jan Reedy <tjreedy@udel.edu>
Subject: Re: Newbie: question regarding references and class relationships
Date: Mon, 10 Jun 2013 15:54:24 -0400
References: <kp4jf4$5fu$1@dont-email.me>
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1; 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:17.0) Gecko/20130509 Thunderbird/17.0.6
In-Reply-To: <kp4jf4$5fu$1@dont-email.me>
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.2984.1370894105.3114.python-list@python.org>
Lines: 12
NNTP-Posting-Host: 2001:888:2000:d::a6
X-Trace: 1370894105 news.xs4all.nl 16012 [2001:888:2000:d::a6]:43497
X-Complaints-To: abuse@xs4all.nl
Xref: csiph.com comp.lang.python:47596

On 6/10/2013 9:18 AM, Rui Maciel wrote:

> class Model:
>          points = []
>          lines = []

Unless you actually need keep the points and lines ordered by entry 
order, or expect to keep sorting them by whatever, sets may be better 
than lists. Testing that a point or line is in the model will be faster, 
as will deleting one by its identify.