Path: csiph.com!usenet.pasdenom.info!gegeweb.org!de-l.enfer-du-nord.net!feeder2.enfer-du-nord.net!feeds.phibee-telecom.net!newsfeed.xs4all.nl!newsfeed3.news.xs4all.nl!xs4all!post.news.xs4all.nl!not-for-mail
Return-Path: <python-python-list@m.gmane.org>
X-Original-To: python-list@python.org
Delivered-To: python-list@mail.python.org
X-Spam-Status: OK 0.020
X-Spam-Evidence: '*H*': 0.96; '*S*': 0.00; 'received:80.91': 0.09; 'received:80.91.229': 0.09; 'received:gmane.org': 0.09; 'received:list': 0.09; 'subject:question': 0.10; 'random': 0.14; 'correlation.': 0.16; 'iteration': 0.16; 'nodes': 0.16; 'received:80.91.229.3': 0.16; 'received:plane.gmane.org': 0.16; 'spurious': 0.16; 'wrote:': 0.18; 'module': 0.19; 'header:User- Agent:1': 0.23; 'header:X-Complaints-To:1': 0.27; 'header:In- Reply-To:1': 0.27; 'function': 0.29; 'fixed': 0.29; 'am,': 0.29; "i'm": 0.30; 'introducing': 0.36; 'sequence': 0.36; 'subject:Simple': 0.36; 'easiest': 0.38; 'to:addr:python-list': 0.38; 'to:addr:python.org': 0.39; 'received:org': 0.40; 'remove': 0.60; 'received:173': 0.61; 'visit': 0.64; 'different': 0.65; 'believe': 0.68; 'risk': 0.72; 'received:fios.verizon.net': 0.84; 'simulation': 0.91
X-Injected-Via-Gmane: http://gmane.org/
To: python-list@python.org
From: Terry Jan Reedy <tjreedy@udel.edu>
Subject: Re: Simple algorithm question - how to reorder a sequence economically
Date: Fri, 24 May 2013 06:10:26 -0400
References: <a31c773f-88d8-4489-8640-12123d884e4d@m2g2000vbb.googlegroups.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
X-Gmane-NNTP-Posting-Host: pool-173-75-251-66.phlapa.fios.verizon.net
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20130509 Thunderbird/17.0.6
In-Reply-To: <a31c773f-88d8-4489-8640-12123d884e4d@m2g2000vbb.googlegroups.com>
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.2054.1369390242.3114.python-list@python.org>
Lines: 13
NNTP-Posting-Host: 2001:888:2000:d::a6
X-Trace: 1369390242 news.xs4all.nl 15914 [2001:888:2000:d::a6]:43850
X-Complaints-To: abuse@xs4all.nl
Xref: csiph.com comp.lang.python:45874

On 5/24/2013 4:14 AM, Peter Brooks wrote:
> What is the easiest way to reorder a sequence pseudo-randomly?
>
> That is, for a sequence 1,2,3,4 to produce an arbitrary ordering (eg
> 2,1,4,3) that is different each time.
>
> I'm writing a simulation and would like to visit all the nodes in a
> different order at each iteration of the simulation to remove the risk
> of a fixed order introducing spurious evidence of correlation.

random module has a shuffle function I believe