Path: csiph.com!x330-a1.tempe.blueboxinc.net!usenet.pasdenom.info!aioe.org!feeder.news-service.com!feeds.phibee-telecom.net!newsfeed.xs4all.nl!newsfeed6.news.xs4all.nl!xs4all!post.news.xs4all.nl!not-for-mail
Return-Path: <rosuav@gmail.com>
X-Original-To: python-list@python.org
Delivered-To: python-list@mail.python.org
X-Spam-Status: OK 0.005
X-Spam-Evidence: '*H*': 0.99; '*S*': 0.00; 'value,': 0.04; '(although': 0.05; 'initialize': 0.07; 'many)': 0.09; 'am,': 0.12; 'agreed,': 0.16; 'from:addr:rosuav': 0.16; 'from:name:chris angelico': 0.16; 'instance:': 0.16; 'operator.': 0.16; 'rhs': 0.16; 'syntax': 0.16; 'wrote:': 0.16; 'wed,': 0.17; 'defined': 0.19; 'header:In-Reply-To:1': 0.22; '(or': 0.23; 'received:209.85.213.46': 0.23; 'received:mail- yw0-f46.google.com': 0.23; 'aug': 0.24; 'statement': 0.25; 'function': 0.27; 'right.': 0.28; 'message-id:@mail.gmail.com': 0.29; 'lines': 0.30; 'times.': 0.30; 'separately': 0.30; 'subject:?': 0.31; 'chris': 0.32; 'expression': 0.32; 'minor': 0.32; 'proposed': 0.32; 'to:addr:python-list': 0.33; 'file.': 0.34; '17,': 0.34; 'assignment': 0.34; 'object': 0.35; 'but': 0.37; 'something': 0.37; 'some': 0.38; 'received:google.com': 0.38; 'received:209.85': 0.38; 'subject:: ': 0.39; "there's": 0.39; 'to:addr:python.org': 0.39; 'might': 0.40; 'more': 0.60; 'easily': 0.61; 'evaluate': 0.71; 'subject:one': 0.77; 'subject:value': 0.84
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type:content-transfer-encoding; bh=de2etW7uAaVOgHTB6FEY0demPbNDAEtc59PHdLnIFKg=; b=M8xFQZTUZByguyYZcfi1q8JI59OmSRZAmChPpUjHo4VZd09YMZxUQUWp4JYkI6ybS5 uzq6lt7u0v1lWTFqsWUA2yreTDrih5FffkZcaieRNbktVG8fqL+NSgryKu2s85qVt4l6 6wJQ+EtRZfMEm/6moNMl7Av11WUJ6Randl9hI=
MIME-Version: 1.0
In-Reply-To: <c6cd02ea-3020-4970-82c6-8d289738bf37@o11g2000yql.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> <mailman.117.1313565232.27778.python-list@python.org> <c6cd02ea-3020-4970-82c6-8d289738bf37@o11g2000yql.googlegroups.com>
Date: Wed, 17 Aug 2011 10:45:24 +0100
Subject: Re: Syntactic sugar for assignment statements: one value to multiple targets?
From: Chris Angelico <rosuav@gmail.com>
To: python-list@python.org
Content-Type: text/plain; charset=ISO-8859-1
Content-Transfer-Encoding: quoted-printable
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.123.1313574326.27778.python-list@python.org>
Lines: 25
NNTP-Posting-Host: 2001:888:2000:d::a6
X-Trace: 1313574326 news.xs4all.nl 23940 [2001:888:2000:d::a6]:49471
X-Complaints-To: abuse@xs4all.nl
Xref: x330-a1.tempe.blueboxinc.net comp.lang.python:11673

On Wed, Aug 17, 2011 at 10:26 AM, gc <gc1223@gmail.com> wrote:
> On Aug 17, 3:13=A0am, Chris Angelico <ros...@gmail.com> wrote:
>
>> Minor clarification: You don't want to initialize them to the same
>> value, which you can do already:
>>
>> a=3Db=3Dc=3Dd=3De=3Ddict()
>
> Right. Call the proposed syntax the "instantiate separately for each
> target" operator. =A0(It can be precisely defined as a * on the RHS of a
> one-into-many assignment statement--i.e. an assignment statement with
> 1 object on the RHS and more than 1 on the LHS).
>

Agreed, but there's no requirement for it to be instantiating
something (although that will be common). "dict()" is an expression
that you want to evaluate five (or however many) times. It might just
as easily be some other function call; for instance:

head1,head2,head3=3Dfile.readline()

to read three lines from a file. Or it mightn't even be a function call per=
 se.

ChrisA