Path: csiph.com!usenet.pasdenom.info!weretis.net!feeder4.news.weretis.net!ecngs!feeder2.ecngs.de!newsfeed.freenet.ag!news2.euro.net!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 0.002 X-Spam-Evidence: '*H*': 1.00; '*S*': 0.00; 'example:': 0.03; 'subject:help': 0.07; 'fork': 0.09; 'received:80.91': 0.09; 'received:80.91.229': 0.09; 'received:gmane.org': 0.09; 'received:list': 0.09; 'def': 0.10; '"for"': 0.16; 'dog': 0.16; 'etc...': 0.16; 'fruit': 0.16; 'itertools': 0.16; 'received:80.91.229.3': 0.16; 'received:dip.t-dialin.net': 0.16; 'received:plane.gmane.org': 0.16; 'received:t-dialin.net': 0.16; 'wrote:': 0.17; '>>>': 0.18; 'import': 0.21; 'this:': 0.23; 'header:User-Agent:1': 0.26; 'header:X-Complaints-To:1': 0.28; 'this?': 0.28; 'cat': 0.29; 'cycles': 0.29; 'use?': 0.29; 'skip:_ 10': 0.29; 'class': 0.29; 'lists': 0.31; 'gets': 0.32; 'could': 0.32; 'print': 0.32; 'to:addr:python-list': 0.33; 'self': 0.34; 'lists.': 0.35; 'something': 0.35; 'there': 0.35; 'received:org': 0.36; 'but': 0.36; 'item': 0.37; 'subject:: ': 0.38; 'some': 0.38; 'to:addr:python.org': 0.39; 'header:Received:5': 0.40; 'information': 0.63; 'email addr:gmail.com': 0.63; 'hello!': 0.65; 'subject:Data': 0.65; 'pear': 0.84; 'subject:urgent': 0.91 X-Injected-Via-Gmane: http://gmane.org/ To: python-list@python.org From: Peter Otten <__peter__@web.de> Subject: Re: Data Tree urgent help!!!!!! Date: Tue, 19 Feb 2013 13:34:40 +0100 Organization: None References: <4abbe91f-a57e-47de-9cf3-5b9574201c83@googlegroups.com> Mime-Version: 1.0 Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7Bit X-Gmane-NNTP-Posting-Host: p508495be.dip.t-dialin.net User-Agent: KNode/4.7.3 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: 50 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1361277272 news.xs4all.nl 6910 [2001:888:2000:d::a6]:55772 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:39212 anadionisio257@gmail.com wrote: > Hello! > I have this lists with information and I need to make a "tree" by > associating the information inside the lists. For example: > > l1 = [apple, pear] > l2 = [dog, cat] > l3 = [fork, spoon] > > And I need to make something like this: > > l4 = [apple, dog, fork] > l5 = [apple, dog, spoon] > l6= [apple, cat, fork] > l7 = [apple, cat, spoon] > l8 = [pear, dog, fork] > etc... > > How can I do this? I could use "for" cycles and "if...else" but with > larger lists it gets complicated > > Is there some simple solution that I can use? Try itertools.product(): >>> class Name(str): ... def __repr__(self): ... return self ... >>> apple, pear, dog, cat, fork, spoon = map(Name, "apple pear dog cat fork spoon".split()) >>> fruit = [apple, pear] >>> pets = [dog, cat] >>> cutlery = [fork, spoon] >>> from itertools import product >>> for item in product(fruit, pets, cutlery): ... print item ... (apple, dog, fork) (apple, dog, spoon) (apple, cat, fork) (apple, cat, spoon) (pear, dog, fork) (pear, dog, spoon) (pear, cat, fork) (pear, cat, spoon)