Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!eu.feeder.erje.net!newsfeed.xs4all.nl!newsfeed2.news.xs4all.nl!xs4all!newsgate.cistron.nl!newsgate.news.xs4all.nl!post.news.xs4all.nl!not-for-mail
Return-Path: <ian.g.kelly@gmail.com>
X-Original-To: python-list@python.org
Delivered-To: python-list@mail.python.org
X-Spam-Status: OK 0.030
X-Spam-Evidence: '*H*': 0.94; '*S*': 0.00; 'tree': 0.05; 'essential.': 0.09; 'mixed': 0.09; 'override': 0.09; 'python': 0.11; '__getitem__,': 0.16; '__len__,': 0.16; 'pythonic': 0.16; 'subclass': 0.16; 'wrote:': 0.18; 'mon,': 0.24; 'header:In-Reply- To:1': 0.27; 'rest': 0.29; 'am,': 0.29; 'especially': 0.30; 'message-id:@mail.gmail.com': 0.30; 'probably': 0.32; 'quite': 0.32; 'cases': 0.33; 'but': 0.35; 'received:google.com': 0.35; 'there': 0.35; 'version': 0.36; 'implement': 0.38; 'to:addr :python-list': 0.38; 'to:addr:python.org': 0.39; 'easy': 0.60; 'reviewed': 0.60; 'you.': 0.62; 'mar': 0.68; 'optimized': 0.68; 'default': 0.69; 'faster.': 0.84
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :content-type; bh=WDtiX90f9mH+HL7w/BtbIOSaZmCZAOt2VAs+ZyahPFQ=; b=lKfTQ4lsTqGKHO2xYDi2mLdVTaisuMQde0qEPJfRDLNTIjk6rETX7iguKsQHuYrK72 Iy2Dtv4UkWsCcAhfaF7AilSyjLtJyYJL1y9N7Ojzk/PPhtqdYg5oBystyUTzbpBUStZe /VtzH58KEW6c/r5hxq8nmf3g2uR1jj3zR53fOYN6ng+D1dFxtOkA3S35TfYNmTTqUjKg YS3j7TNC196KIhXrn2TIjOr9HBmLD9FHzEEEto1H0sgX8jiyqjSHl8f+bc6zp0ztaxb3 BHB9M/aTEIO2E7qoTkU+fEL+5WxwIEBwDEon4NSpH/rRRvsentIGv0x3ekrEtPyS5hQc VKew==
X-Received: by 10.68.191.39 with SMTP id gv7mr4267650pbc.90.1394736098909; Thu, 13 Mar 2014 11:41:38 -0700 (PDT)
MIME-Version: 1.0
In-Reply-To: <87zjkyq7nr.fsf@elektro.pacujo.net>
References: <lennh4$kpm$1@cabale.usenet-fr.net> <CAN1F8qU8AJ+Z-Rb4+wGsYWd_bS5aOA3bsjd5NjF46MUvnecSeQ@mail.gmail.com> <mailman.7473.1393598638.18130.python-list@python.org> <XnsA2E95FA1E1EB6duncanbooth@127.0.0.1> <bnvctpF5vanU1@mid.individual.net> <mailman.7920.1394252278.18130.python-list@python.org> <87eh2d3x8h.fsf_-_@elektro.pacujo.net> <CAGGBd_qU3Zp3A4pymnDQfWynWZwFVrdHJpG=U0WZTap4HiymdA@mail.gmail.com> <mailman.7937.1394311101.18130.python-list@python.org> <87eh2ctmht.fsf@elektro.pacujo.net> <mailman.7941.1394328694.18130.python-list@python.org> <87zjkz3eo3.fsf@elektro.pacujo.net> <mailman.7963.1394400019.18130.python-list@python.org> <87a9czrrax.fsf@elektro.pacujo.net> <531d3058$0$29994$c3e8da3$5496439d@news.astraweb.com> <87eh2atw6s.fsf@elektro.pacujo.net> <roy-BE3C76.09590110032014@news.panix.com> <mailman.8007.1394468681.18130.python-list@python.org> <8761nmrnfk.fsf@elektro.pacujo.net> <mailman.8013.1394471845.18130.python-list@python.org> <87zjkyq7nr.fsf@elektro.pacujo.net>
From: Ian Kelly <ian.g.kelly@gmail.com>
Date: Thu, 13 Mar 2014 12:40:58 -0600
Subject: Re: Balanced trees
To: Python <python-list@python.org>
Content-Type: text/plain; charset=ISO-8859-1
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: <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>
Newsgroups: comp.lang.python
Message-ID: <mailman.8133.1394736421.18130.python-list@python.org>
Lines: 12
NNTP-Posting-Host: 2001:888:2000:d::a6
X-Trace: 1394736421 news.xs4all.nl 2901 [2001:888:2000:d::a6]:36284
X-Complaints-To: abuse@xs4all.nl
Xref: csiph.com comp.lang.python:68339

On Mon, Mar 10, 2014 at 11:34 AM, Marko Rauhamaa <marko@pacujo.net> wrote:
> The main thing is there are use cases where order is essential. That's
> why I have had to implement the AVL tree in Python myself. No biggie,
> but a C implementation would probably be much faster. Also, a standard
> version would likely be reviewed and tested better and have all Pythonic
> accessors in place.

That last is actually quite easy to achieve, especially using the
built-in ABCs.  Just subclass from collections.MutableMapping and
implement __len__, __iter__, __getitem__, __setitem__ and __delitem__;
and default implementations of the rest will be mixed in for you.  Or
you can override those with optimized implementations.