Path: csiph.com!x330-a1.tempe.blueboxinc.net!usenet.pasdenom.info!aioe.org!feeder.news-service.com!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 0.001 X-Spam-Evidence: '*H*': 1.00; '*S*': 0.00; '3.2': 0.05; 'sure.': 0.05; 'python': 0.08; 'received:80.91': 0.09; 'received:80.91.229': 0.09; 'received:80.91.229.12': 0.09; 'received:gmane.org': 0.09; 'received:list': 0.09; 'received:lo.gmane.org': 0.09; 'statement.': 0.09; 'double-quote': 0.16; 'expected,': 0.16; 'from:addr:behnel.de': 0.16; 'from:addr:stefan_ml': 0.16; 'from:name:stefan behnel': 0.16; 'linux).': 0.16; 'mistake.': 0.16; '"python': 0.16; 'processor': 0.16; 'this:': 0.16; 'switched': 0.19; 'loop': 0.22; 'maybe': 0.22; 'header:In-Reply- To:1': 0.22; '(on': 0.23; 'literal': 0.23; 'way?': 0.23; 'subject:Question': 0.25; 'handles': 0.25; 'noticed': 0.26; 'windows': 0.26; 'mode': 0.28; 'received:84': 0.28; 'server': 0.29; 'around.': 0.29; 'stefan': 0.29; 'second': 0.29; 'ran': 0.30; 'it.': 0.33; 'skip:" 20': 0.33; 'to:addr:python-list': 0.34; 'header:X-Complaints-To:1': 0.34; 'header:User-Agent:1': 0.34; 'someone': 0.34; 'post': 0.34; "can't": 0.34; 'test': 0.34; 'statement,': 0.35; 'running': 0.35; 'explain': 0.36; 'but': 0.37; 'using': 0.37; 'received:org': 0.38; 'subject:: ': 0.38; 'two': 0.38; 'run': 0.39; 'common': 0.39; 'header:Mime-Version:1': 0.39; 'to:addr:python.org': 0.39; 'your': 0.60; 'power': 0.62; 'time?': 0.73; '100000': 0.84; 'surround': 0.84; 'swap': 0.84; '2003.': 0.91 X-Injected-Via-Gmane: http://gmane.org/ To: python-list@python.org From: Stefan Behnel Subject: Re: Question about timeit Date: Fri, 22 Jul 2011 08:37:11 +0200 References: Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Gmane-NNTP-Posting-Host: dslb-084-056-019-190.pools.arcor-ip.net User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.18) Gecko/20110617 Lightning/1.0b2 Thunderbird/3.1.11 In-Reply-To: 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: 38 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1311316646 news.xs4all.nl 23936 [2001:888:2000:d::a6]:35753 X-Complaints-To: abuse@xs4all.nl Xref: x330-a1.tempe.blueboxinc.net comp.lang.python:10077 Frank Millman, 22.07.2011 08:06: > I mentioned in a recent post that I noticed an inconsistency in timeit, and > then reported that I must have made a mistake. > > I have now identified my problem, but I don't understand it. > > C:\Python32\Lib>timeit.py "int(float('165.0'))" > 100000 loops, best of 3: 3.52 usec per loop > > C:\Python32\Lib>timeit.py "int(float('165.0'))" > 100000 loops, best of 3: 3.51 usec per loop > > C:\Python32\Lib>timeit.py 'int(float("165.0"))' > 10000000 loops, best of 3: 0.0888 usec per loop > > C:\Python32\Lib>timeit.py 'int(float("165.0"))' > 10000000 loops, best of 3: 0.0887 usec per loop > > I ran them both twice just to be sure. > > The first two use double-quote marks to surround the statement, and > single-quote marks to surround the literal inside the statement. > > The second two swap the quote marks around. > > Can someone explain the difference? > > I am using python 3.2 on Windows Server 2003. As expected, I can't reproduce this (on Linux). Maybe your processor switched from power save mode to performance mode right after running the test a second time? Or maybe you need a better console application that handles quotes in a more obvious way? Note that it's common to run timeit like this: "python -m timeit". Stefan