Path: csiph.com!usenet.pasdenom.info!news.redatomik.org!newsfeed.xs4all.nl!newsfeed3.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 0.004 X-Spam-Evidence: '*H*': 0.99; '*S*': 0.00; 'defaults': 0.05; 'from:addr:yahoo.co.uk': 0.05; 'indices': 0.07; 'subject:How': 0.09; 'len(x)': 0.09; 'received:80.91': 0.09; 'received:80.91.229': 0.09; 'received:gmane.org': 0.09; 'received:list': 0.09; 'slices': 0.09; 'python': 0.11; 'index': 0.13; 'received:80.91.229.3': 0.16; 'received:plane.gmane.org': 0.16; 'selects': 0.16; 'sequence.': 0.16; 'subject:access': 0.16; 'zero,': 0.16; 'wrote:': 0.16; 'string': 0.17; 'language': 0.19; '>>>': 0.20; 'trying': 0.22; 'lawrence': 0.22; 'am,': 0.23; '2015': 0.23; 'seems': 0.24; 'header:In-Reply-To:1': 0.24; 'second': 0.24; 'header:User-Agent:1': 0.26; 'header:X-Complaints- To:1': 0.26; 'sequence': 0.27; 'subject:list': 0.28; 'omitted': 0.29; 'language.': 0.32; 'url:python': 0.33; 'useful': 0.35; 'to:addr:python-list': 0.35; 'something': 0.35; 'but': 0.36; 'being': 0.36; 'url:org': 0.36; 'thanks': 0.36; 'basic': 0.36; 'subject:: ': 0.37; 'tue,': 0.38; 'received:org': 0.38; 'say': 0.38; 'means': 0.39; 'enough': 0.39; 'url:docs': 0.39; 'to:addr:python.org': 0.39; 'sure': 0.40; 'mark': 0.40; 'subject:the': 0.40; 'url:3': 0.60; 'learn': 0.60; 'even': 0.61; 'entire': 0.61; 'matter': 0.63; 'our': 0.64; 'charset:windows-1252': 0.65; 'here': 0.66; 'teach': 0.70; 'pythonistas,': 0.84; 'utc+5:30,': 0.84; 'visually': 0.84; 'url:tutorial': 0.91; 'received:2': 0.93 X-Injected-Via-Gmane: http://gmane.org/ To: python-list@python.org From: Mark Lawrence Subject: Re: How to access the low digits of a list Date: Wed, 03 Jun 2015 22:41:33 +0100 References: <18a4709f-47c8-41f7-87d5-08bbb00166b6@googlegroups.com> <11005554-e89f-407c-8720-fae1bb3fced8@googlegroups.com> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit X-Gmane-NNTP-Posting-Host: host-2-98-194-38.as13285.net User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0 In-Reply-To: <11005554-e89f-407c-8720-fae1bb3fced8@googlegroups.com> 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: 30 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1433367715 news.xs4all.nl 2969 [2001:888:2000:d::a6]:58859 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:92001 On 03/06/2015 22:08, Rustom Mody wrote: > On Tuesday, June 2, 2015 at 7:50:58 PM UTC+5:30, Ian wrote: >> On Tue, Jun 2, 2015 at 6:35 AM, Rustom Mody wrote: >>> For that matter even this works >>> But I am not sure whats happening or that I like it >>> >>>>>> [x[-2:] for x in lines] >>> ['12', '42', '49', '56', '25', '36', '49', '64', '81', '00'] >> >> x[-2:] selects all items in the sequence with index i such that len(x) >> - 2 <= i < len(x). For a sequence of length 2 or less, that's the >> entire sequence. > > Thanks -- learn something > So it means that indices can give indexerror; slices cannot? > Seems fair enough put that way, but is visually counterintuitive > Are you seriously trying to say that you teach Python but don't understand a basic that is here https://docs.python.org/3/tutorial/introduction.html, "Slice indices have useful defaults; an omitted first index defaults to zero, an omitted second index defaults to the size of the string being sliced."? -- My fellow Pythonistas, ask not what our language can do for you, ask what you can do for our language. Mark Lawrence