Path: csiph.com!x330-a1.tempe.blueboxinc.net!usenet.pasdenom.info!aioe.org!news.stack.nl!newsfeed.xs4all.nl!newsfeed5.news.xs4all.nl!xs4all!newsgate.cistron.nl!newsgate.news.xs4all.nl!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 0.056 X-Spam-Evidence: '*H*': 0.89; '*S*': 0.00; '-tkc': 0.16; 'from:addr:python.list': 0.16; 'from:addr:tim.thechases.com': 0.16; 'from:name:tim chase': 0.16; 'message- id:@tim.thechases.com': 0.16; 'received:50': 0.16; 'received:70.251': 0.16; 'received:dsl.rcsntx.swbell.net': 0.16; 'received:rcsntx.swbell.net': 0.16; 'received:swbell.net': 0.16; 'cc:addr:python-list': 0.16; 'help.': 0.19; 'subject:list': 0.21; 'header:In-Reply-To:1': 0.22; 'defined': 0.24; 'function': 0.27; 'cc:addr:gmail.com': 0.28; 'cc:addr:python.org': 0.29; 'cc:2**2': 0.31; 'url:library': 0.31; 'thanks': 0.32; 'does': 0.32; 'header :User-Agent:1': 0.33; 'url:python': 0.35; 'subject:with': 0.37; 'should': 0.38; 'url:org': 0.39; 'more': 0.61; 'your': 0.61; 'here:': 0.67; 'subject:one': 0.77; 'to:addr:yahoo.com': 0.83; 'subject:over': 0.84; 'subject:value': 0.84; 'cc:no real name:2**2': 0.95 Date: Tue, 07 Feb 2012 15:31:49 -0600 From: Tim Chase User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.24) Gecko/20111120 Icedove/3.1.16 MIME-Version: 1.0 To: Sammy Danso Subject: Re: iterating over list with one mising value References: <1328646189.84221.YahooMailClassic@web161206.mail.bf1.yahoo.com> In-Reply-To: <1328646189.84221.YahooMailClassic@web161206.mail.bf1.yahoo.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - boston.accountservergroup.com X-AntiAbuse: Original Domain - python.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - tim.thechases.com X-Source: X-Source-Args: X-Source-Dir: Cc: python-list@python.org, d@davea.name X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.12 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: 12 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1328650296 news.xs4all.nl 6899 [2001:888:2000:d::a6]:58153 X-Complaints-To: abuse@xs4all.nl Xref: x330-a1.tempe.blueboxinc.net comp.lang.python:19985 > Thanks for your responses and help. thought I should provide > more information for clarity. It sounds like you want the "grouper" function as defined here: http://docs.python.org/library/itertools.html#recipes which does what you describe. -tkc