Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!eu.feeder.erje.net!news2.arglkargh.de!news.albasani.net!newsreader4.netcologne.de!news.netcologne.de!xlned.com!feeder7.xlned.com!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 0.004
X-Spam-Evidence: '*H*': 0.99; '*S*': 0.00; 'operator': 0.03; 'subject:code': 0.07; 'received:80.91': 0.09; 'received:80.91.229': 0.09; 'received:gmane.org': 0.09; 'received:list': 0.09; 'subject:Help': 0.11; 'python': 0.11; 'precedence': 0.16; 'received:80.91.229.3': 0.16; 'received:plane.gmane.org': 0.16; 'rules.': 0.16; 'so)': 0.16; 'wrote:': 0.18; 'header:User-Agent:1': 0.23; '2.x': 0.24; 'integer': 0.24; 'header:X-Complaints-To:1': 0.27; 'header:In- Reply-To:1': 0.27; 'division': 0.31; 'maybe': 0.34; 'subject:with': 0.35; 'should': 0.36; 'two': 0.37; 'nov': 0.38; 'to:addr:python-list': 0.38; 'to:addr:python.org': 0.39; 'received:org': 0.40; "you're": 0.61; 'email addr:gmail.com': 0.63; 'subject:this': 0.83; 'received:108': 0.93; '2013': 0.98
X-Injected-Via-Gmane: http://gmane.org/
To: python-list@python.org
From: Dave Angel <davea@davea.name>
Subject: Re: Help me with this code
Date: Tue, 05 Nov 2013 23:44:21 -0600
References: <612c0028-ae66-4200-b9a5-a613eca94762@googlegroups.com> <612c0028-ae66-4200-b9a5-a613eca94762@googlegroups.com>
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 8bit
X-Gmane-NNTP-Posting-Host: pool-108-12-85-29.hstntx.dsl-w.verizon.net
In-Reply-To: <612c0028-ae66-4200-b9a5-a613eca94762@googlegroups.com>
User-Agent: Groundhog Newsreader for Android
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: <https://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: <https://mail.python.org/mailman/listinfo/python-list>, <mailto:python-list-request@python.org?subject=subscribe>
Newsgroups: comp.lang.python
Message-ID: <mailman.2074.1383716672.18130.python-list@python.org>
Lines: 14
NNTP-Posting-Host: 2001:888:2000:d::a6
X-Trace: 1383716672 news.xs4all.nl 15976 [2001:888:2000:d::a6]:35309
X-Complaints-To: abuse@xs4all.nl
Xref: csiph.com comp.lang.python:58549

On Tue, 5 Nov 2013 17:51:00 -0800 (PST), chovdary@gmail.com wrote:
>         result  +=  ((-1) ** (k+1))/2*k-1

One of two things are happening here. Maybe both.

You're using Python 2.x (and should havesaid so) where integer 
division is truncated.

You're missing around some part of the intended denominator. Check 
operator precedence rules.

-- 
DaveA