Path: csiph.com!x330-a1.tempe.blueboxinc.net!usenet.pasdenom.info!aioe.org!feeder.news-service.com!news2.euro.net!newsfeed.xs4all.nl!newsfeed5.news.xs4all.nl!xs4all!post.news.xs4all.nl!not-for-mail
Return-Path: <z@etiol.net>
X-Original-To: python-list@python.org
Delivered-To: python-list@mail.python.org
X-Spam-Status: OK 0.116
X-Spam-Level: *
X-Spam-Evidence: '*H*': 0.77; '*S*': 0.00; 'received:209.85.160.174': 0.09; 'received:mail-gy0-f174.google.com': 0.09; 'coded': 0.16; 'dunno': 0.16; 'variables;': 0.16; 'wrote:': 0.16; '>>>': 0.18; 'header:In-Reply-To:1': 0.22; 'skip:[ 10': 0.27; 'separate': 0.28; 'import': 0.28; 'message-id:@mail.gmail.com': 0.29; 'collections': 0.30; 'subject:?': 0.31; 'to:addr:python-list': 0.33; "i've": 0.34; '...': 0.34; 'received:209.85.160': 0.35; 'example,': 0.37; 'but': 0.37; 'received:google.com': 0.38; 'received:209.85': 0.38; 'subject:: ': 0.39; 'to:addr:python.org': 0.39; "it's": 0.40; 'your': 0.61; 'address': 0.61; 'august': 0.70; 'subject:one': 0.77; 'fifty': 0.84; 'purpose,': 0.84; 'subject:value': 0.84
MIME-Version: 1.0
Sender: z@etiol.net
X-Originating-IP: [190.52.50.194]
In-Reply-To: <7f30e39b-4e4f-4426-b819-b4670871d199@df3g2000vbb.googlegroups.com>
References: <16ea4848-db0c-489a-968c-ca40700f5806@m5g2000prh.googlegroups.com> <j2eki3$43t$1@dont-email.me> <7f30e39b-4e4f-4426-b819-b4670871d199@df3g2000vbb.googlegroups.com>
Date: Wed, 17 Aug 2011 16:07:55 -0400
X-Google-Sender-Auth: kztjuLNwPfzEir0mA5hTk8GzjRg
Subject: Re: Syntactic sugar for assignment statements: one value to multiple targets?
From: Zero Piraeus <schesis@gmail.com>
To: python-list@python.org
Content-Type: text/plain; charset=UTF-8
X-BeenThere: python-list@python.org
X-Mailman-Version: 2.1.12
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.145.1313611680.27778.python-list@python.org>
Lines: 23
NNTP-Posting-Host: 2001:888:2000:d::a6
X-Trace: 1313611680 news.xs4all.nl 23864 [2001:888:2000:d::a6]:50882
X-Complaints-To: abuse@xs4all.nl
Xref: x330-a1.tempe.blueboxinc.net comp.lang.python:11713

:

Off on a tangent ...

On 16 August 2011 20:14, gc <gc1223@gmail.com> wrote:
>
> Let me address one smell from my particular example, which may be the
> one you're noticing. If I needed fifty parallel collections I would
> not use separate variables; I've coded a ghastly defaultdefaultdict
> just for this purpose, which effectively permits what most people
> would express as defaultdict(defaultdict(list)) [not possible AFAIK
> with the existing defaultdict class].

Dunno if it's better than your ghastly defaultdefaultdict, but this works:

>>> from collections import defaultdict
>>> ddd = defaultdict(lambda: defaultdict(list))
>>> ddd["foo"]["bar"].append("something")
>>> ddd["foo"]["bar"]
['something']
>>>

 -[]z.