Re: Sorting a list

Path	csiph.com!fu-berlin.de!uni-berlin.de!not-for-mail
From	Peter Otten <__peter__@web.de>
Newsgroups	comp.lang.python
Subject	Re: Sorting a list
Date	Mon, 04 Apr 2016 08:56:26 +0200
Organization	None
Lines	23
Message-ID	<mailman.2.1459753001.32530.python-list@python.org> (permalink)
References	<ndrn97$bco$1@dont-email.me> <mailman.408.1459711883.28225.python-list@python.org> <ndrt29$36l$1@dont-email.me> <ndt36r$oi$1@ger.gmane.org>
Mime-Version	1.0
Content-Type	text/plain; charset="ISO-8859-1"
Content-Transfer-Encoding	7Bit
X-Trace	news.uni-berlin.de g9Q2ZUla0O7o+S5ZFkEcNwcAdg9w2Phv00g1uAENEW/Q==
Return-Path	<python-python-list@m.gmane.org>
X-Original-To	python-list@python.org
Delivered-To	python-list@mail.python.org
X-Spam-Status	OK 0.001
X-Spam-Evidence	'H': 1.00; 'S': 0.00; 'operator': 0.03; 'string.': 0.04; 'received:80.91': 0.09; 'received:80.91.229': 0.09; 'received:gmane.org': 0.09; 'received:list': 0.09; 'intermediate': 0.15; 'dfs': 0.16; 'itemgetter': 0.16; 'lambda': 0.16; 'received:80.91.229.3': 0.16; 'received:dip0.t-ipconnect.de': 0.16; 'received:io': 0.16; 'received:plane.gmane.org': 0.16; 'received:psf.io': 0.16; 'received:t-ipconnect.de': 0.16; 'wrote:': 0.16; 'input': 0.18; 'second': 0.24; 'import': 0.24; 'header:User-Agent:1': 0.26; 'subject:list': 0.26; 'header:X-Complaints-To:1': 0.26; 'print': 0.30; 'lists': 0.34; 'that,': 0.34; 'could': 0.35; "isn't": 0.35; 'skip:{ 10': 0.36; 'to:addr:python-list': 0.36; 'pm,': 0.36; 'subject:: ': 0.37; 'two': 0.37; 'received:org': 0.37; 'thought': 0.37; 'why': 0.39; 'data': 0.39; 'well.': 0.40; 'to:addr:python.org': 0.40; 'received:de': 0.40; '>>>>>': 0.66; 'otten': 0.84
X-Injected-Via-Gmane	http://gmane.org/
X-Gmane-NNTP-Posting-Host	p57bd9cb3.dip0.t-ipconnect.de
User-Agent	KNode/4.13.3
X-BeenThere	python-list@python.org
X-Mailman-Version	2.1.21
Precedence	list
List-Id	General discussion list for the Python programming language <python-list.python.org>
List-Unsubscribe	<https://mail.python.org/mailman/options/python-list>, <mailto:python-list-request@python.org?subject=unsubscribe>
List-Archive	<http://mail.python.org/pipermail/python-list/>
List-Post	<mailto:python-list@python.org>
List-Help	<mailto:python-list-request@python.org?subject=help>
List-Subscribe	<https://mail.python.org/mailman/listinfo/python-list>, <mailto:python-list-request@python.org?subject=subscribe>
X-Mailman-Original-Message-ID	<ndt36r$oi$1@ger.gmane.org>
X-Mailman-Original-References	<ndrn97$bco$1@dont-email.me> <mailman.408.1459711883.28225.python-list@python.org> <ndrt29$36l$1@dont-email.me>
Xref	csiph.com comp.lang.python:106424

Show key headers only | View raw

DFS wrote:

> On 4/3/2016 3:31 PM, Peter Otten wrote:

>>>>> from operator import itemgetter as get
>>>>> print "\n".join("{1} {0}".format(*p) for p in sorted(
>> ... sorted(colCounts, key=get(1)), key=get(0), reverse=True))
> 
> Kind of clunky looking.  Is that why don't you recommend it?

That, and you produce two intermediate lists and an intermediate string. For 
larger input data this may produce significant overhead.

>> You could also cheat and use
>>
>> lambda v: (-v[0], v[1])
>>
>> and a single sorted().
> 
> That works well.  Why is it 'cheating'?

On second thought it isn't ;)

Thread

Sorting a list DFS <nospam@dfs.com> - 2016-04-03 14:30 -0400
  Re: Sorting a list DFS <nospam@dfs.com> - 2016-04-03 14:34 -0400
  Re: Sorting a list Peter Otten <__peter__@web.de> - 2016-04-03 21:31 +0200
    Re: Sorting a list DFS <nospam@dfs.com> - 2016-04-03 16:08 -0400
      Re: Sorting a list Peter Otten <__peter__@web.de> - 2016-04-04 08:56 +0200
      Re: Sorting a list Random832 <random832@fastmail.com> - 2016-04-04 09:40 -0400
      Re: Sorting a list Peter Otten <__peter__@web.de> - 2016-04-04 16:12 +0200

csiph-web