Path: csiph.com!usenet.pasdenom.info!gegeweb.org!de-l.enfer-du-nord.net!feeder1.enfer-du-nord.net!cs.uu.nl!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 0.109 X-Spam-Level: * X-Spam-Evidence: '*H*': 0.78; '*S*': 0.00; 'welcome.': 0.07; 'subject:How': 0.09; '(without': 0.09; 'subject:number': 0.09; '(must': 0.16; 'call)': 0.16; 'from:addr:torriem': 0.16; 'from:name:michael torrie': 0.16; 'wrote:': 0.17; '(or': 0.18; 'random': 0.24; 'header:In-Reply-To:1': 0.25; 'header:User- Agent:1': 0.26; 'post': 0.28; 'unlikely': 0.29; 'url:2012': 0.30; 'comments': 0.33; 'to:addr:python-list': 0.33; 'requirements': 0.33; 'along': 0.35; 'ahead': 0.35; 'consistent': 0.35; 'pm,': 0.35; 'subject:?': 0.35; 'received:org': 0.36; 'message- id:@gmail.com': 0.36; 'should': 0.36; 'thank': 0.36; 'subject:: ': 0.38; 'to:addr:python.org': 0.39; 'received:192': 0.39; 'received:192.168': 0.40; 'header:Received:5': 0.40; 'your': 0.60; 'easy': 0.60; 'most': 0.61; 'here:': 0.62; 'more': 0.63; 'url:blogspot': 0.64; 'url:11': 0.71; 'subject:account': 0.74; 'guessed': 0.84; 'dozen': 0.91; 'interested?': 0.91; 'technique': 0.93 X-Virus-Scanned: amavisd-new at torriefamily.org Date: Sat, 03 Nov 2012 08:50:58 -0600 From: Michael Torrie User-Agent: Mozilla/5.0 (X11; Linux i686; rv:10.0.7) Gecko/20120824 Thunderbird/10.0.7 MIME-Version: 1.0 To: python-list@python.org Subject: Re: How to generate account number? References: In-Reply-To: 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: 17 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1351954293 news.xs4all.nl 6872 [2001:888:2000:d::a6]:52855 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:32698 On 11/02/2012 03:13 PM, Andriy Kornatskyy wrote: > > Requirements for `account number` generator: > > 1. Issue pseudo random consistent number (must be unique for dozen millions of records) > 2. Easy check validity (without a need to make a database call) > > Interested? Read more here: > > http://mindref.blogspot.com/2012/11/generate-account-number.html > > Comments or suggestions are welcome. Thank you for sharing. Your post came along at just the right time. I was just pondering on how to create a number that is unique each time (or most of the time), and unlikely to be guessed ahead of time. Your technique should work very well for me.