Path: csiph.com!x330-a1.tempe.blueboxinc.net!usenet.pasdenom.info!gegeweb.org!de-l.enfer-du-nord.net!feeder1.enfer-du-nord.net!newsfeed.eweka.nl!eweka.nl!feeder3.eweka.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 0.001 X-Spam-Evidence: '*H*': 1.00; '*S*': 0.00; 'python,': 0.01; 'variable,': 0.07; 'given,': 0.09; 'object;': 0.09; 'query,': 0.09; 'statement.': 0.09; 'storing': 0.09; 'tuple': 0.09; 'way;': 0.09; 'am,': 0.12; 'received:209.85.210.174': 0.13; 'received :mail-iy0-f174.google.com': 0.13; 'from:addr:rosuav': 0.16; 'from:name:chris angelico': 0.16; "function's": 0.16; 'helps!': 0.16; 'numbering': 0.16; 'pid,': 0.16; 'subject:Newbie': 0.16; 'variable.': 0.16; 'zero:': 0.16; 'mon,': 0.16; 'wrote:': 0.18; 'please?': 0.18; 'subject:list': 0.21; 'subject:Question': 0.21; 'dec': 0.22; 'header:In-Reply-To:1': 0.22; 'starts': 0.24; 'do,': 0.25; 'mode': 0.25; 'function': 0.27; 'variable': 0.28; 'message- id:@mail.gmail.com': 0.28; 'temporary': 0.29; 'config': 0.30; 'chris': 0.30; 'usually': 0.31; 'actually': 0.33; 'rather': 0.33; 'there': 0.33; 'to:addr:python-list': 0.34; 'certain': 0.34; 'record': 0.35; 'something': 0.35; 'question': 0.36; 'element': 0.37; 'but': 0.37; 'list,': 0.37; 'received:google.com': 0.37; 'received:209.85': 0.38; 'put': 0.38; 'subject:from': 0.38; 'easier': 0.38; 'i.e.': 0.39; "i'd": 0.39; "it's": 0.40; 'received:209': 0.40; 'to:addr:python.org': 0.40; 'hope': 0.61; 'more': 0.61; '2011': 0.61; 'achieve': 0.61; 'your': 0.61; '19,': 0.68; 'imagine': 0.71; "everything's": 0.91; 'ninth': 0.91; 'absolutely': 0.98 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :content-type; bh=6Ki5w8KENfKgv55sNvybVC7TWihAzSSbuEuiKGXEWhY=; b=Pp2y7HDpnXaRiddU1rAWipSN3udJ5rRAY/PjktaV/BuNUwU1VLfKD07+jho3fFw7DL SWPtzDj5rJlB6Gpsh2XBG/TwCG6nOn/lwBksqWTmitD8UABxcq0bYsA90XxkztEy77qe ETDHC9UVQVOFl9e38amU7bRdGJqgBgJ4g2cK4= MIME-Version: 1.0 In-Reply-To: References: Date: Mon, 19 Dec 2011 07:51:08 +1100 Subject: Re: Newbie Question: Obtain element from list of tuples From: Chris Angelico To: python-list@python.org Content-Type: text/plain; charset=ISO-8859-1 X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.12 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: 35 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1324241477 news.xs4all.nl 6917 [2001:888:2000:d::a6]:46803 X-Complaints-To: abuse@xs4all.nl Xref: x330-a1.tempe.blueboxinc.net comp.lang.python:17480 On Mon, Dec 19, 2011 at 6:41 AM, HoneyMonster wrote: > My question is doubtless a very easy one to answer: Say I want the ninth > element in the twentieth tuple put into variable PID, I can do this, > bearing in mind that numbering starts at zero: > > tup = recs[19] > PID = tup[8] > > But there must be an easier way; i.e. to do it in one go without the > extra variable. How do I achieve that please? The specific answer has already been given, but I'd like to fill in the generality. In Python, everything's an object; if you can do something with a variable, you can do it with an expression too. I don't know what your function call is to obtain your record list, but imagine it's: recs = conn.query("SELECT * FROM some_table") Then you can actually do all of this in a single statement. It's not usually what you'll want to do, but this is legal: pid = conn.query("SELECT * FROM some_table")[19][8] If you're absolutely certain that you'll always get precisely one value from a query, this becomes rather more useful: mode = conn.query("SELECT mode FROM config WHERE id=5")[0][0] In any case: You can work with a function's return value directly, without first storing it in a temporary variable. Hope that helps! Chris Angelico