Path: csiph.com!usenet.pasdenom.info!aioe.org!news.stack.nl!newsfeed.xs4all.nl!newsfeed4a.news.xs4all.nl!xs4all!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 0.000 X-Spam-Evidence: '*H*': 1.00; '*S*': 0.00; 'that?': 0.05; 'explicit': 0.07; 'string': 0.09; 'arrays': 0.09; 'subject:keys': 0.09; 'cc:addr:python-list': 0.11; 'python': 0.11; '23,': 0.16; 'adam': 0.16; 'dict': 0.16; 'from:addr:rosuav': 0.16; 'from:name:chris angelico': 0.16; 'hashes': 0.16; 'lookups': 0.16; 'simplicity.': 0.16; 'subject: \n ': 0.16; 'subject:sqlite3': 0.16; 'wrote:': 0.18; 'bit': 0.19; 'bonus': 0.22; 'cc:addr:python.org': 0.22; 'byte': 0.24; 'integer': 0.24; 'cc:2**0': 0.24; "i've": 0.25; 'header:In-Reply-To:1': 0.27; 'involving': 0.30; 'message- id:@mail.gmail.com': 0.30; 'equality': 0.31; 'fri,': 0.33; 'guess': 0.33; 'subject: (': 0.35; 'received:google.com': 0.35; 'pm,': 0.38; 'though,': 0.39; 'to:none': 0.92 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:cc :content-type; bh=MlHFEOXIJuH8zUlL1vBF3ilrCIfVvmXRIyi5dA7vV/Q=; b=cuWc50tO5xYbvEwD7wNGPAxEmL7mUeyx5pZHxKUFKAXQiBjAX1DNcIDp6B3o5LU73R 5ePwv3TFAMg49yNK79rsbYSHoTtvSoxbwcZ5z2ugPAq1HFu/B6ssMKQVWvt7jw/QLF2/ NWlhaCGvrr2xqZ2tOu1rsa7F2Z7iZYgXuG2MG8ngZIFfijUp1BzOU5Q4x6rGZCU4SDdW bwReKrBWwBsMG+soDGPa6phLWzedTzIn9meWBVeqKZhKmFK9u8Do0Zr9323rkPCONPPE ik6gU4pYAaFjd3zTVdlp+bBc3DwWATop5AZ4wL7VDk1x8anmsDbDd8X7u0gi6snJlrFi uKxA== MIME-Version: 1.0 X-Received: by 10.52.104.7 with SMTP id ga7mr2928501vdb.29.1400842770202; Fri, 23 May 2014 03:59:30 -0700 (PDT) In-Reply-To: References: <05c15bxrpj.ln2@news.ducksburg.com> Date: Fri, 23 May 2014 20:59:30 +1000 Subject: Re: hashing strings to integers (was: hashing strings to integers for sqlite3 keys) From: Chris Angelico Cc: "python-list@python.org" Content-Type: text/plain; charset=UTF-8 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: 11 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1400842778 news.xs4all.nl 2846 [2001:888:2000:d::a6]:41294 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:71924 On Fri, May 23, 2014 at 8:27 PM, Adam Funk wrote: > I've also used hashes of strings for other things involving > deduplication or fast lookups (because integer equality is faster than > string equality). I guess if it's just for deduplication, though, a > set of byte arrays is as good as a set of int? Want a better way to do that? Use a set or dict and let Python do the hashing. It'll be every bit as fast as explicit hashing, plus you get the bonus of simplicity. ChrisA