Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!eu.feeder.erje.net!newsfeed.xs4all.nl!newsfeed4.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 0.028 X-Spam-Evidence: '*H*': 0.95; '*S*': 0.00; 'subject:Python': 0.06; 'received:80.91': 0.09; 'received:80.91.229': 0.09; 'received:gmane.org': 0.09; 'received:list': 0.09; 'python': 0.11; 'random': 0.14; '8bit%:32': 0.16; 'finney': 0.16; 'implies': 0.16; 'pythonic': 0.16; 'received:80.91.229.3': 0.16; 'received:plane.gmane.org': 0.16; 'recognise': 0.16; 'header:User- Agent:1': 0.23; 'gets': 0.27; 'header:X-Complaints-To:1': 0.27; "doesn't": 0.30; "i'm": 0.30; 'writes:': 0.31; "i'd": 0.34; 'problem': 0.35; 'except': 0.35; 'beyond': 0.35; 'point.': 0.35; 'there': 0.35; 'so,': 0.37; 'list': 0.37; 'starting': 0.37; 'problems': 0.38; 'ben': 0.38; 'to:addr:python-list': 0.38; 'to:addr:python.org': 0.39; 'received:org': 0.40; 'is.': 0.60; 'hear': 0.63; 'love': 0.65; 'skip:\xe2 10': 0.65; 'obvious': 0.74; 'received:125': 0.84; 'vatican': 0.84; 'problems?': 0.91; '\xe2\x80\x9cthe': 0.91 X-Injected-Via-Gmane: http://gmane.org/ To: python-list@python.org From: Ben Finney Subject: Re: Idiomatic backtracking in Python Date: Mon, 26 Jan 2015 11:32:08 +1100 References: Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Gmane-NNTP-Posting-Host: jigong.madmonks.org X-Public-Key-ID: 0xAC128405 X-Public-Key-Fingerprint: 517C F14B B2F3 98B0 CB35 4855 B8B2 4C06 AC12 8405 X-Public-Key-URL: http://www.benfinney.id.au/contact/bfinney-pubkey.asc X-Post-From: Ben Finney User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/24.4 (gnu/linux) Cancel-Lock: sha1:EP7Gm4YTEjMfZUPvvvysxfeAqVQ= 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: 18 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1422232323 news.xs4all.nl 2855 [2001:888:2000:d::a6]:46287 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:84582 Johannes Bauer writes: > So, I would like to ask if you have a Pythonic approach to > backtracking problems? If so, I'd love to hear your solutions! I'm not aware of what the problem is. “Back-tracking” doesn't have a general meaning I recognise beyond random access into a data structure. So a Python list is the obvious starting point. Do you have a specific meaning of “back-tracking” that implies particular problems that are difficult to solve? -- \ “The Vatican is not a state.… a state must have people. There | `\ are no Vaticanians.… No-one gets born in the Vatican except by | _o__) an unfortunate accident.” —Geoffrey Robertson, 2010-09-18 | Ben Finney