Re: Python getters and setters

Path	csiph.com!usenet.pasdenom.info!weretis.net!feeder4.news.weretis.net!rt.uk.eu.org!newsfeed.xs4all.nl!newsfeed3.news.xs4all.nl!xs4all!post.news.xs4all.nl!not-for-mail
Return-Path	<python.list@tim.thechases.com>
X-Original-To	python-list@python.org
Delivered-To	python-list@mail.python.org
X-Spam-Status	OK 0.063
X-Spam-Evidence	'H': 0.88; 'S': 0.00; 'subject:Python': 0.06; 'self.data': 0.09; 'def': 0.12; '-tkc': 0.16; 'from:addr:python.list': 0.16; 'from:addr:tim.thechases.com': 0.16; 'from:name:tim chase': 0.16; 'wrote:': 0.18; 'primary': 0.26; 'header:In-Reply-To:1': 0.27; "d'aprano": 0.31; 'steven': 0.31; 'allows': 0.31; 'class': 0.32; 'skip:_ 10': 0.34; 'skip:d 20': 0.34; 'add': 0.35; 'consistent': 0.36; 'data,': 0.36; 'charset:us-ascii': 0.36; 'to:addr:python-list': 0.38; 'that,': 0.38; 'to:addr:python.org': 0.39; 'even': 0.60; 'goal': 0.75; 'clearer': 0.84; 'received:50.22': 0.84; 'good,': 0.91
Date	Sat, 17 Aug 2013 12:31:01 -0500
From	Tim Chase <python.list@tim.thechases.com>
To	python-list@python.org
Subject	Re: Python getters and setters
In-Reply-To	<520fb04f$0$30000$c3e8da3$5496439d@news.astraweb.com>
References	<227bd47c-0e86-4d65-985f-e59aa4f25294@googlegroups.com> <520fb04f$0$30000$c3e8da3$5496439d@news.astraweb.com>
X-Mailer	Claws Mail 3.8.1 (GTK+ 2.24.10; x86_64-pc-linux-gnu)
Mime-Version	1.0
Content-Type	text/plain; charset=US-ASCII
Content-Transfer-Encoding	7bit
X-AntiAbuse	This header was added to track abuse, please include it with any abuse report
X-AntiAbuse	Primary Hostname - boston.accountservergroup.com
X-AntiAbuse	Original Domain - python.org
X-AntiAbuse	Originator/Caller UID/GID - [47 12] / [47 12]
X-AntiAbuse	Sender Address Domain - tim.thechases.com
X-Get-Message-Sender-Via	boston.accountservergroup.com: none
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.18.1376760589.23369.python-list@python.org> (permalink)
Lines	26
NNTP-Posting-Host	2001:888:2000:d::a6
X-Trace	1376760589 news.xs4all.nl 15997 [2001:888:2000:d::a6]:35629
X-Complaints-To	abuse@xs4all.nl
Xref	csiph.com comp.lang.python:52638

Show key headers only | View raw

On 2013-08-17 17:18, Steven D'Aprano wrote:
> # Yes, this is good, consistent design
> len(myrecord.field)
> len(obj.data)
> len(data.value)
> len(collection[key])

I would also add that, if the primary goal of your class is to
encapsulate the data, you can do

  class MyClass:
    def __init__(self, ...):
      self.data = []
    def __len__(self):
      return len(self.data)

which allows for the even clearer

  my_obj = MyClass(...)
  manipulate(my_obj)
  if len(my_obj) > 42:
    do_important_stuff()

-tkc

Thread

Python getters and setters Fernando Saldanha <fsaldan1@gmail.com> - 2013-08-17 09:53 -0700
  Re: Python getters and setters MRAB <python@mrabarnett.plus.com> - 2013-08-17 18:10 +0100
  Re: Python getters and setters Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-08-17 17:18 +0000
    Re: Python getters and setters Tim Chase <python.list@tim.thechases.com> - 2013-08-17 12:31 -0500
    Re: Python getters and setters Irmen de Jong <irmen.NOSPAM@xs4all.nl> - 2013-08-18 00:52 +0200
      Re: Python getters and setters Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-08-17 23:40 +0000
        Re: Python getters and setters Chris Angelico <rosuav@gmail.com> - 2013-08-18 02:07 +0100
  Re: Python getters and setters Fernando Saldanha <fsaldan1@gmail.com> - 2013-08-17 22:26 -0700

csiph-web