Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!eu.feeder.erje.net!news2.arglkargh.de!news.mixmin.net!rt.uk.eu.org!newsfeed.xs4all.nl!newsfeed3a.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 0.016 X-Spam-Evidence: '*H*': 0.97; '*S*': 0.00; 'python.': 0.02; 'string': 0.09; 'function,': 0.09; 'suggest': 0.14; '"in': 0.16; 'dictionary,': 0.16; 'from:addr:torriem': 0.16; 'from:name:michael torrie': 0.16; 'goal,': 0.16; 'mutable': 0.16; 'parameter.': 0.16; 'subject:variable': 0.16; 'wrote:': 0.18; 'module': 0.19; 'header :User-Agent:1': 0.23; 'string,': 0.24; 'pass': 0.26; 'header:In- Reply-To:1': 0.27; 'function': 0.29; 'appreciated.': 0.29; 'explained': 0.31; 'class': 0.32; 'another': 0.32; 'raw': 0.33; 'could': 0.34; 'but': 0.35; 'list': 0.37; 'message-id:@gmail.com': 0.38; 'to:addr:python-list': 0.38; 'pm,': 0.38; 'sure': 0.39; 'to:addr:python.org': 0.39; 'either': 0.39; 'skip:p 20': 0.39; 'received:org': 0.40; 'around.': 0.60; 'new': 0.61; 'more': 0.64; 'yes': 0.68; 'as:': 0.81; 'actually,': 0.84; 'skip:/ 30': 0.84 X-Virus-Scanned: amavisd-new at torriefamily.org Date: Tue, 06 May 2014 14:57:12 -0600 From: Michael Torrie User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20131118 Thunderbird/17.0.11 MIME-Version: 1.0 To: python-list@python.org Subject: Re: Pass variable by reference References: <235C4BFA-9770-481A-9FCF-21C3F036769C@gmail.com> In-Reply-To: <235C4BFA-9770-481A-9FCF-21C3F036769C@gmail.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.15 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: 19 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1399409846 news.xs4all.nl 2966 [2001:888:2000:d::a6]:56297 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:70986 On 05/05/2014 06:39 PM, Satish Muthali wrote: > I want to nuke /var/lib/postgresql/9.3.4/main/data , however > programatically I want it to be as: /var/lib/postgresql/ pgversion>/main/data > > Any help is appreciated. Not sure really. But if you want to pass a some data around that can be manipulated "in place" as it were, say in a function, then yes it must be either a mutable object like a list or a dictionary, or you can wrap up your data in a class and manipulate it via an instance of that class that you pass around. You can do the same thing in a module too, actually, which is a form of singleton. Another solution is just to have a function return a new cooked string, based on a raw string passed in as a parameter. Perhaps if you explained more clearly your end goal, people could suggest ideas in accomplishing it in a way that works well in Python.