Path: csiph.com!fu-berlin.de!uni-berlin.de!not-for-mail From: Mark Lawrence Newsgroups: comp.lang.python Subject: Re: Simple exercise Date: Fri, 11 Mar 2016 02:03:05 +0000 Lines: 38 Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit X-Trace: news.uni-berlin.de MFn0zfSi7XYvL34OoyjAJQbeKmjCOjMBvHux1wKG8gpw== Return-Path: X-Original-To: python-list@python.org Delivered-To: python-list@mail.python.org X-Spam-Status: OK 0.004 X-Spam-Evidence: '*H*': 0.99; '*S*': 0.00; 'from:addr:yahoo.co.uk': 0.05; 'character,': 0.07; 'received:80.91': 0.09; 'received:80.91.229': 0.09; 'received:gmane.org': 0.09; 'received:list': 0.09; 'def': 0.13; 'missed': 0.15; 'combined.': 0.16; 'received:80.91.229.3': 0.16; 'received:io': 0.16; 'received:plane.gmane.org': 0.16; 'received:psf.io': 0.16; 'wrote:': 0.16; 'element': 0.18; 'language': 0.19; '>>>': 0.20; 'suggested': 0.20; 'lawrence': 0.22; 'header:In-Reply-To:1': 0.24; 'header:User-Agent:1': 0.26; 'header:X-Complaints-To:1': 0.26; 'earlier': 0.27; 'skip:( 20': 0.28; 'print': 0.30; 'code': 0.30; 'language.': 0.32; 'subject:Simple': 0.33; 'except': 0.34; 'lists': 0.34; 'problem.': 0.35; 'but': 0.36; 'should': 0.36; 'there': 0.36; 'structures': 0.36; 'to:addr:python-list': 0.36; 'subject:: ': 0.37; 'two': 0.37; 'received:org': 0.37; 'list.': 0.37; 'wrong': 0.38; 'data': 0.39; 'to:addr:python.org': 0.40; 'mark': 0.40; 'charset:windows-1252': 0.62; 'course': 0.62; 'our': 0.64; 'reply': 0.68; 'pythonistas,': 0.84 X-Injected-Via-Gmane: http://gmane.org/ X-Gmane-NNTP-Posting-Host: 80.234.129.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0 In-Reply-To: X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: General discussion list for the Python programming language List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Xref: csiph.com comp.lang.python:104575 On 11/03/2016 01:45, BartC wrote: > On 11/03/2016 01:21, Mark Lawrence wrote: >> On 11/03/2016 00:05, BartC wrote: > >>> def last(a): >>> return a[-1] >>> >>> def init(a): # all except last element >>> return a[0:len(a)-1] >> >> What is wrong with a[0:1] ? > > The returns the head of the list. I need everything except the last > element ('init' is from Haskell). I missed out one character, it should of course have been:- a[0:-1] > >>> for i in range(len(names)): >>> print (names[i],totals[i]) >>> >> >> Always a code smell when range() and len() are combined. > > Any other way of traversing two lists in parallel? > Use zip(), but as I suggested in my earlier reply there are better data structures than two lists in parallel for this problem. -- My fellow Pythonistas, ask not what our language can do for you, ask what you can do for our language. Mark Lawrence