Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.python > #66245

Re: A curious bit of code...

Path csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!eu.feeder.erje.net!xlned.com!feeder7.xlned.com!newsfeed.xs4all.nl!newsfeed2.news.xs4all.nl!xs4all!post.news.xs4all.nl!not-for-mail
Return-Path <python-python-list@m.gmane.org>
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; 'from:addr:yahoo.co.uk': 0.04; 'string': 0.09; 'boring': 0.09; 'lawrence': 0.09; 'received:80.91': 0.09; 'received:80.91.229': 0.09; 'received:gmane.org': 0.09; 'received:list': 0.09; 'language.': 0.14; "wouldn't": 0.14; '"key': 0.16; '10000000': 0.16; 'argument.': 0.16; 'discussion.': 0.16; 'indexerror:': 0.16; 'received:80.91.229.3': 0.16; 'received:plane.gmane.org': 0.16; 'subject:bit': 0.16; 'unimportant': 0.16; 'index': 0.16; 'language': 0.16; 'wrote:': 0.18; 'obviously': 0.18; 'fit': 0.20; 'header:User-Agent:1': 0.23; '---': 0.24; 'skip:" 20': 0.27; 'header:X-Complaints-To:1': 0.27; 'header:In-Reply-To:1': 0.27; '"",': 0.31; 'awards': 0.31; 'file': 0.32; 'probably': 0.32; '(most': 0.33; "i'd": 0.34; 'version': 0.36; 'being': 0.38; 'to:addr:python-list': 0.38; 'recent': 0.39; 'to:addr:python.org': 0.39; 'received:org': 0.40; 'how': 0.40; 'most': 0.60; 'free': 0.61; 'viruses': 0.61; 'range': 0.61; 'protection': 0.63; 'our': 0.64; 'antivirus': 0.68; 'obvious,': 0.91; 'ware': 0.91
X-Injected-Via-Gmane http://gmane.org/
To python-list@python.org
From Mark Lawrence <breamoreboy@yahoo.co.uk>
Subject Re: A curious bit of code...
Date Thu, 13 Feb 2014 21:14:09 +0000
References <4cc09129-43ee-4205-a24c-03f92b594abc@googlegroups.com> <CAKJDb-OoN2K4--AseaFkuXv3-4vr+a3TPQc7omSrsHVYKcbBrw@mail.gmail.com> <ldjbqm$u8n$1@ger.gmane.org>
Mime-Version 1.0
Content-Type text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding 7bit
X-Gmane-NNTP-Posting-Host host-78-146-8-178.as13285.net
User-Agent Mozilla/5.0 (Windows NT 6.1; rv:24.0) Gecko/20100101 Thunderbird/24.3.0
In-Reply-To <ldjbqm$u8n$1@ger.gmane.org>
X-Antivirus avast! (VPS 140213-0, 13/02/2014), Outbound message
X-Antivirus-Status Clean
X-BeenThere python-list@python.org
X-Mailman-Version 2.1.15
Precedence list
List-Id General discussion list for the Python programming language <python-list.python.org>
List-Unsubscribe <https://mail.python.org/mailman/options/python-list>, <mailto:python-list-request@python.org?subject=unsubscribe>
List-Archive <http://mail.python.org/pipermail/python-list/>
List-Post <mailto:python-list@python.org>
List-Help <mailto:python-list-request@python.org?subject=help>
List-Subscribe <https://mail.python.org/mailman/listinfo/python-list>, <mailto:python-list-request@python.org?subject=subscribe>
Newsgroups comp.lang.python
Message-ID <mailman.6886.1392326068.18130.python-list@python.org> (permalink)
Lines 50
NNTP-Posting-Host 2001:888:2000:d::a6
X-Trace 1392326068 news.xs4all.nl 2916 [2001:888:2000:d::a6]:49465
X-Complaints-To abuse@xs4all.nl
Xref csiph.com comp.lang.python:66245

Show key headers only | View raw

On 13/02/2014 21:01, Neil Cerutti wrote:
> On 2014-02-13, Zachary Ware <zachary.ware+pylist@gmail.com> wrote:
>> In a fit of curiosity, I did some timings:
>>
>> 'and'ed indexing:
>>
>> C:\tmp>py -m timeit -s "key = '<test>'" "key[0] == '<' and key[-1] == '>'"
>> 1000000 loops, best of 3: 0.35 usec per loop
>>
>> C:\tmp>py -m timeit -s "key = '<test'" "key[0] == '<' and key[-1] == '>'"
>> 1000000 loops, best of 3: 0.398 usec per loop
>>
>> C:\tmp>py -m timeit -s "key = 'test>'" "key[0] == '<' and key[-1] == '>'"
>> 1000000 loops, best of 3: 0.188 usec per loop
>>
>> C:\tmp>py -m timeit -s "key = 'test'" "key[0] == '<' and key[-1] == '>'"
>> 10000000 loops, best of 3: 0.211 usec per loop
>>
>> C:\tmp>py -m timeit -s "key = ''" "key[0] == '<' and key[-1] == '>'"
>> Traceback (most recent call last):
>>    File "P:\Python34\lib\timeit.py", line 292, in main
>>      x = t.timeit(number)
>>    File "P:\Python34\lib\timeit.py", line 178, in timeit
>>      timing = self.inner(it, self.timer)
>>    File "<timeit-src>", line 6, in inner
>>      key[0] == '<' and key[-1] == '>'
>> IndexError: string index out of range
>
> The corrected version
>
> key and key[0] == '<' and key[-1] == '>'
>
> probably still wins the Pretty Unimportant Olympics.
>

Exactly how I'd write it.  To me it wins awards for being most boring 
and most obvious, obviously YMMV or we wouldn't be having this 
discussion.  Or argument.  Or contradiction :)

-- 
My fellow Pythonistas, ask not what our language can do for you, ask 
what you can do for our language.

Mark Lawrence

---
This email is free from viruses and malware because avast! Antivirus protection is active.
http://www.avast.com

Back to comp.lang.python | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

A curious bit of code... forman.simon@gmail.com - 2014-02-13 10:37 -0800
  Re: A curious bit of code... Roy Smith <roy@panix.com> - 2014-02-13 13:45 -0500
  Re: A curious bit of code... Ethan Furman <ethan@stoneleaf.us> - 2014-02-13 10:45 -0800
  Re: A curious bit of code... Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-02-13 19:09 +0000
  Re: A curious bit of code... Alain Ketterlin <alain@dpt-info.u-strasbg.fr> - 2014-02-13 20:05 +0100
  Re: A curious bit of code... Neil Cerutti <neilc@norwich.edu> - 2014-02-13 19:17 +0000
  Re: A curious bit of code... Ethan Furman <ethan@stoneleaf.us> - 2014-02-13 11:20 -0800
    Re: A curious bit of code... Roy Smith <roy@panix.com> - 2014-02-13 14:28 -0500
  Re: A curious bit of code... Ethan Furman <ethan@stoneleaf.us> - 2014-02-13 11:25 -0800
  Re: A curious bit of code... Neil Cerutti <neilc@norwich.edu> - 2014-02-13 19:25 +0000
  Re: A curious bit of code... Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-02-13 19:32 +0000
  Re: A curious bit of code... Peter Otten <__peter__@web.de> - 2014-02-13 20:43 +0100
    Re: A curious bit of code... Marko Rauhamaa <marko@pacujo.net> - 2014-02-13 21:56 +0200
  Re: A curious bit of code... Ethan Furman <ethan@stoneleaf.us> - 2014-02-13 11:23 -0800
  Re: A curious bit of code... Neil Cerutti <neilc@norwich.edu> - 2014-02-13 19:51 +0000
  Re: A curious bit of code... Ethan Furman <ethan@stoneleaf.us> - 2014-02-13 11:59 -0800
  Re: A curious bit of code... Zachary Ware <zachary.ware+pylist@gmail.com> - 2014-02-13 13:59 -0600
  Re: A curious bit of code... Chris Angelico <rosuav@gmail.com> - 2014-02-14 07:29 +1100
  Re: A curious bit of code... Tim Chase <python.list@tim.thechases.com> - 2014-02-13 14:39 -0600
  Re: A curious bit of code... Emile van Sebille <emile@fenx.com> - 2014-02-13 12:55 -0800
    Re: A curious bit of code... Roy Smith <roy@panix.com> - 2014-02-13 16:24 -0500
      Re: A curious bit of code... Ethan Furman <ethan@stoneleaf.us> - 2014-02-13 16:23 -0800
  Re: A curious bit of code... Chris Angelico <rosuav@gmail.com> - 2014-02-14 08:01 +1100
  Re: A curious bit of code... Neil Cerutti <neilc@norwich.edu> - 2014-02-13 21:01 +0000
  Re: A curious bit of code... Peter Otten <__peter__@web.de> - 2014-02-13 22:06 +0100
  Re: A curious bit of code... Chris Angelico <rosuav@gmail.com> - 2014-02-14 08:10 +1100
  Re: A curious bit of code... Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-02-13 21:14 +0000
  Re: A curious bit of code... Zachary Ware <zachary.ware+pylist@gmail.com> - 2014-02-13 15:20 -0600
  Re: A curious bit of code... Zachary Ware <zachary.ware+pylist@gmail.com> - 2014-02-13 15:19 -0600
  Re: A curious bit of code... Emile van Sebille <emile@fenx.com> - 2014-02-13 13:23 -0800
  Re: A curious bit of code... Chris Angelico <rosuav@gmail.com> - 2014-02-14 08:31 +1100
    Re: A curious bit of code... Roy Smith <roy@panix.com> - 2014-02-13 16:38 -0500
  Re: A curious bit of code... Zachary Ware <zachary.ware+pylist@gmail.com> - 2014-02-13 15:47 -0600
  Re: A curious bit of code... Serhiy Storchaka <storchaka@gmail.com> - 2014-02-13 23:49 +0200
    Re: A curious bit of code... Roy Smith <roy@panix.com> - 2014-02-13 16:51 -0500
  Re: A curious bit of code... Ethan Furman <ethan@stoneleaf.us> - 2014-02-13 13:33 -0800
  Re: A curious bit of code... Chris Angelico <rosuav@gmail.com> - 2014-02-14 09:13 +1100
  Re: A curious bit of code... Ethan Furman <ethan@stoneleaf.us> - 2014-02-13 14:26 -0800
  Re: A curious bit of code... Terry Reedy <tjreedy@udel.edu> - 2014-02-13 19:29 -0500
  Re: A curious bit of code... forman.simon@gmail.com - 2014-02-13 18:45 -0800
    Re: A curious bit of code... Ned Batchelder <ned@nedbatchelder.com> - 2014-02-13 22:26 -0500
      Re: A curious bit of code... forman.simon@gmail.com - 2014-02-14 12:04 -0800
        Re: A curious bit of code... Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-02-14 21:01 +0000
  Re: A curious bit of code... Dave Angel <davea@davea.name> - 2014-02-14 07:19 -0500
    Re: A curious bit of code... Roy Smith <roy@panix.com> - 2014-02-14 09:06 -0500

csiph-web