Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!1.eu.feeder.erje.net!feeds.phibee-telecom.net!newsfeed.xs4all.nl!newsfeed4a.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 0.005 X-Spam-Evidence: '*H*': 0.99; '*S*': 0.00; '16,': 0.03; 'string': 0.09; 'subject:characters': 0.09; 'subject:string': 0.09; '"\\n")': 0.16; '(it': 0.16; '>on': 0.16; 'formatted': 0.16; 'forth.': 0.16; 'from:addr:cs': 0.16; 'from:addr:zip.com.au': 0.16; 'from:name:cameron simpson': 0.16; 'message- id:@cskk.homeip.net': 0.16; 'received:211.29': 0.16; 'received:211.29.132': 0.16; 'received:cskk.homeip.net': 0.16; 'received:homeip.net': 0.16; 'received:optusnet.com.au': 0.16; 'received:syd.optusnet.com.au': 0.16; 'simpson': 0.16; 'subject: \n ': 0.16; 'subject:remove': 0.16; 'wrote:': 0.18; 'header:User- Agent:1': 0.23; 'cheers,': 0.24; 'header:In-Reply-To:1': 0.27; 'point': 0.28; 'chris': 0.29; 'am,': 0.29; 'lines': 0.31; 'stuff': 0.32; 'comment': 0.34; 'subject:the': 0.34; "i'd": 0.34; 'subject:from': 0.34; 'really': 0.36; 'received:com.au': 0.36; 'doing': 0.36; 'charset:us-ascii': 0.36; 'list': 0.37; 'performance': 0.37; 'received:211': 0.38; 'to:addr:python-list': 0.38; 'skip:- 10': 0.38; 'to:addr:python.org': 0.39; 'details.': 0.61; 'simply': 0.61; "you're": 0.61; 'content- disposition:inline': 0.62; 'email addr:gmail.com': 0.63; 'more': 0.64; '2015': 0.84; 'end.': 0.84; 'subject:long': 0.84; 'subject:very': 0.91 Date: Sun, 17 May 2015 08:41:14 +1000 From: Cameron Simpson To: python-list@python.org Subject: Re: Fastest way to remove the first x characters from a very long string MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Disposition: inline In-Reply-To: <8354e4ba-0a80-48a1-b2e9-6edb4b67ff36@googlegroups.com> User-Agent: Mutt/1.5.23 (2014-03-12) References: <8354e4ba-0a80-48a1-b2e9-6edb4b67ff36@googlegroups.com> X-Optus-CM-Score: 0 X-Optus-CM-Analysis: v=2.1 cv=L/MkHYj8 c=1 sm=1 tr=0 a=rgDbx50tNA2z7xLXQOoruw==:117 a=rgDbx50tNA2z7xLXQOoruw==:17 a=ZtCCktOnAAAA:8 a=PO7r1zJSAAAA:8 a=J0QyKEt1u0cA:10 a=kj9zAlcOel0A:10 a=vrnE16BAAAAA:8 a=h1PgugrvaO0A:10 a=pGLkceISAAAA:8 a=IMekcmy9rMVGAvvEN0kA:9 a=CjuIK1q_8ugA:10 X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.20+ 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: 27 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1431817664 news.xs4all.nl 2922 [2001:888:2000:d::a6]:40651 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:90760 On 16May2015 10:35, bruceg113355@gmail.com wrote: >On Saturday, May 16, 2015 at 12:59:19 PM UTC-4, Chris Angelico wrote: >> On Sun, May 17, 2015 at 2:22 AM, wrote: >> > # Original Approach >> > # ----------------- >> > ss = ss.split("\n") >> > ss1 = "" >> > for sdata in ss: >> > ss1 = ss1 + (sdata[OFFSET:] + "\n") >> > >> > # Chris's Approach >> > # ---------------- >> > lines = ss.split("\n") >> > new_text = "\n".join(line[8:] for line in lines) [...] > >Your approach more than meets my requirements. >Data is formatted correctly and performance is simply amazing. >OFFSET and \n are small details. The only comment I'd make at this point is to consider if you really need a single string at the end. Keeping it as a list of lines may be more flexible. (It will consume more memory.) If you're doing more stuff with the string as lines then you'd need to re-split it, and so forth. Cheers, Cameron Simpson