Path: csiph.com!usenet.pasdenom.info!aioe.org!news.stack.nl!newsfeed.xs4all.nl!newsfeed1a.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 0.026 X-Spam-Evidence: '*H*': 0.95; '*S*': 0.00; 'python,': 0.02; 'skip:[ 20': 0.04; 'python': 0.11; '-tkc': 0.16; 'awesome.': 0.16; 'dislike': 0.16; 'feeding': 0.16; 'from:addr:python.list': 0.16; 'from:addr:tim.thechases.com': 0.16; 'from:name:tim chase': 0.16; 'highlight': 0.16; 'seconds.': 0.16; 'subject:Unicode': 0.16; 'wrote:': 0.18; "python's": 0.19; '>>>': 0.22; 'tests': 0.22; 'unicode': 0.24; 'header:In-Reply-To:1': 0.27; 'thus': 0.29; 'wonder': 0.29; 'operations,': 0.30; 'skip:( 20': 0.30; 'actual': 0.34; 'test': 0.35; 'but': 0.35; 'charset:us-ascii': 0.36; 'should': 0.36; 'skip:[ 10': 0.38; 'to:addr:python-list': 0.38; 'rather': 0.38; 'to:addr:python.org': 0.39; 'full': 0.61; 'mentioned': 0.61; 'email addr:gmail.com': 0.63; 'show': 0.63; 'skip:n 10': 0.64; 'more': 0.64; 'here': 0.66; 'notices': 0.68; 'savings': 0.81; 'received:50.22': 0.84; 'worthless': 0.84; 'cutting': 0.91 Date: Tue, 29 Apr 2014 12:59:23 -0500 From: Tim Chase To: python-list@python.org Subject: Re: Unicode 7 In-Reply-To: References: X-Mailer: Claws Mail 3.8.1 (GTK+ 2.24.10; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - boston.accountservergroup.com X-AntiAbuse: Original Domain - python.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - tim.thechases.com X-Get-Message-Sender-Via: boston.accountservergroup.com: authenticated_id: tim@thechases.com 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: 35 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1398794381 news.xs4all.nl 2976 [2001:888:2000:d::a6]:48022 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:70723 On 2014-04-29 10:37, wxjmfauth@gmail.com wrote: > >>> timeit.repeat("(x*1000 + y)[:-1]", setup="x = 'abc'; y = 'z'") > [1.4027834829454946, 1.38714224331963, 1.3822586635296261] > >>> timeit.repeat("(x*1000 + y)[:-1]", setup="x = 'abc'; y = > >>> '\u0fce'") > [5.462776291480395, 5.4479432055423445, 5.447874284053398] > >>> > >>> > >>> # more interesting > >>> timeit.repeat("(x*1000 + y)[:-1]",\ > ... setup="x = 'abc'.encode('utf-8'); y = > '\u0fce'.encode('utf-8')") [1.3496489533188765, 1.328654286266783, > 1.3300913977710707] > >>> While I dislike feeding the troll, what I see here is: on your machine, all unicode manipulations in the test should take ~5.4 seconds. But Python notices that some of your strings *don't* require a full 32-bits and thus optimizes those operations, cutting about 75% of the processing time (wow...4-bytes-per-char to 1-byte-per-char, I wonder where that 75% savings comes from). So rather than highlight any *problem* with Python, your [mostly worthless microbenchmark non-realworld] tests show that Python's unicode implementation is awesome. Still waiting to see an actual bug-report as mentioned on the other thread. -tkc