Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!eu.feeder.erje.net!newsfeed.xs4all.nl!newsfeed1.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 0.037 X-Spam-Evidence: '*H*': 0.93; '*S*': 0.00; '21,': 0.07; 'attribute': 0.07; 'purpose.': 0.07; 'api': 0.11; 'example).': 0.16; 'pathological': 0.16; 'subclass': 0.16; 'wrote:': 0.18; 'obviously': 0.18; 'variable': 0.18; 'bit': 0.19; 'examples': 0.20; 'example': 0.22; 'aug': 0.22; 'mon,': 0.24; 'regardless': 0.24; '>': 0.26; 'changes,': 0.26; 'header:In-Reply-To:1': 0.27; 'idea': 0.28; 'am,': 0.29; 'message-id:@mail.gmail.com': 0.30; 'url:mailman': 0.30; '(maybe': 0.31; "d'aprano": 0.31; 'piece': 0.31; 'steven': 0.31; 'class': 0.32; 'probably': 0.32; 'url:python': 0.33; 'something': 0.35; 'received:google.com': 0.35; 'interface,': 0.36; 'url:listinfo': 0.36; 'useful': 0.36; 'subject:?': 0.36; 'url:org': 0.36; 'should': 0.36; 'example,': 0.37; 'skip:& 10': 0.38; 'to:addr:python-list': 0.38; 'to:addr:python.org': 0.39; 'called': 0.40; 'url:mail': 0.40; 'information': 0.63; 'name': 0.63; 'notified': 0.63; 'such': 0.63; 'wish': 0.70; 'toy': 0.84; '2013,': 0.91; 'subject:skip:E 10': 0.95; '2013': 0.98 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=NQQurnokLsL30XRr6Bw40m45PGtYAoj+sg5Nl2Nth6c=; b=MbhttFVK6KhLfeSP+NQhINnVyrm/NwabDu1YrkDjekG5BGsssMkPXdgg1HesRiV1oM w/qSe3PFr52U6VtTlnwEgaY74aNq4UoHTSo8AjAZ+qlQe+D7e3eihaSn3WhHGwGT9Jnu zjONCnxx2CL7FJALakLdIqUHIdp31BzLAP8SRTx6YxASkq+QnG5yDqK08fgACyssmuQI PwdSAPIHsBQWENv0CTd3yNBZKNNNVJbZ1AXzJwPb8iLvVkxkz5wIIkaCqpmm6bBJZUAG 0r0v6/wm8K8ff1xUjkM5NJXfzayJdT1llnF6hgnZ33zyVVgfl4qdlEqoRu6mYSx5dtV8 k1mg== MIME-Version: 1.0 X-Received: by 10.66.158.72 with SMTP id ws8mr11809439pab.39.1377122577895; Wed, 21 Aug 2013 15:02:57 -0700 (PDT) In-Reply-To: <1377103926.2140.12517705.035CBD5C@webmail.messagingengine.com> References: <8255dfbd-a2a1-4ab7-b900-ee19faa459f2@googlegroups.com> <520fa223$0$30000$c3e8da3$5496439d@news.astraweb.com> <5211c3cc$0$29885$c3e8da3$5496439d@news.astraweb.com> <1377103926.2140.12517705.035CBD5C@webmail.messagingengine.com> Date: Wed, 21 Aug 2013 16:02:57 -0600 Subject: Re: Encapsulation unpythonic? From: Ian Kelly To: Python Content-Type: multipart/alternative; boundary=047d7bacc79611573604e47c5653 X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.15 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: 79 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1377122581 news.xs4all.nl 15925 [2001:888:2000:d::a6]:45688 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:52799 --047d7bacc79611573604e47c5653 Content-Type: text/plain; charset=ISO-8859-1 On Aug 21, 2013 10:53 AM, wrote: > > On Mon, Aug 19, 2013, at 3:05, Steven D'Aprano wrote: > > In this toy example, both parties are at fault: the author of Parrot for > > unnecessary data-hiding of something which is so obviously a useful piece > > of information and should be part of the public interface, > > It may wish to be notified when its name changes, and so have a name > property. The example as given has no such property, and regardless of whether it is a property or an attribute the public API should just be called "name". > The subclass may want to use a variable called _name for some > other purpose. (maybe "name" isn't the best example). Probably not a good idea for multiple reasons if the base class already has something called "name". On Aug 21, 2013 10:53 AM, wrote: > On Mon, Aug 19, 2013, at 3:05, Steven D'Aprano wrote: > > In this toy example, both parties are at fault: the author of Parrot for > > unnecessary data-hiding of something which is so obviously a useful piece > > of information and should be part of the public interface, > > It may wish to be notified when its name changes, and so have a name > property. The subclass may want to use a variable called _name for some > other purpose. (maybe "name" isn't the best example). > > Examples often look pathological when you simplify out the bit that > makes them make sense. > > -- > Random832 > -- > http://mail.python.org/mailman/listinfo/python-list > --047d7bacc79611573604e47c5653 Content-Type: text/html; charset=ISO-8859-1

On Aug 21, 2013 10:53 AM, <random832@fastmail.us> wrote:
>
> On Mon, Aug 19, 2013, at 3:05, Steven D'Aprano wrote:
> > In this toy example, both parties are at fault: the author of Parrot for
> > unnecessary data-hiding of something which is so obviously a useful piece
> > of information and should be part of the public interface,
>
> It may wish to be notified when its name changes, and so have a name
> property.

The example as given has no such property, and regardless of whether it is a property or an attribute the public API should just be called "name".

> The subclass may want to use a variable called _name for some
> other purpose. (maybe "name" isn't the best example).

Probably not a good idea for multiple reasons if the base class already has something called "name".

On Aug 21, 2013 10:53 AM, <random832@fastmail.us> wrote:
On Mon, Aug 19, 2013, at 3:05, Steven D'Aprano wrote:
> In this toy example, both parties are at fault: the author of Parrot for
> unnecessary data-hiding of something which is so obviously a useful piece
> of information and should be part of the public interface,

It may wish to be notified when its name changes, and so have a name
property. The subclass may want to use a variable called _name for some
other purpose. (maybe "name" isn't the best example).

Examples often look pathological when you simplify out the bit that
makes them make sense.

--
Random832
--
http://mail.python.org/mailman/listinfo/python-list
--047d7bacc79611573604e47c5653--