Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!eu.feeder.erje.net!news-1.dfn.de!news.dfn.de!fu-berlin.de!uni-berlin.de!news.dfncis.de!not-for-mail
From: Helmut Jarausch <jarausch@igpm.rwth-aachen.de>
Newsgroups: comp.lang.python
Subject: Re: How to make this faster
Date: 5 Jul 2013 15:47:45 GMT
Lines: 27
Message-ID: <b3o851Fu5lhU1@mid.dfncis.de>
References: <b3ne2rFojnkU1@mid.dfncis.de> <b3nmtfFojnkU3@mid.dfncis.de> < b3o512Ftc39U3@mid.dfncis.de> <mailman.4300.1373037531.3114.python-list@ python.org>
Mime-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
X-Trace: news.dfncis.de LCzlh5fo50fjUcmg4YcURAx5ZMARgY5CN6dfQc8qNXdxBenOI85xe4szPv
Cancel-Lock: sha1:1OqOIhORUX/dPsyIbI8PZqZBahM=
User-Agent: Pan/0.139 (Sexual Chocolate; GIT bf56508 git://git.gnome.org/pan2)
Xref: csiph.com comp.lang.python:49997

On Fri, 05 Jul 2013 16:18:41 +0100, Fábio Santos wrote:

> On 5 Jul 2013 15:59, "Helmut Jarausch" <jarausch@igpm.rwth-aachen.de> wrote:
>>
>> On Fri, 05 Jul 2013 13:44:57 +0100, Fábio Santos wrote:
>> May I suggest you avoid range and use enumerate(the_array) instead? It
>> might be faster.
>>
>> How does this work?
>>
>> Given
>>
>> Grid= [[0 for j in range(9)] for i in range(9)]
>>
>> for (r,c,val) in ????(Grid) :
>>
>> Helmut
> 
> for r, row_lst in enumerate(Grid):
>     for c, val in enumerate(row_lst):

This is only slightly faster. I assume the creation of the temporary lists "row_list"
is a bit expensive.
Taking 5.4 seconds it's much slower than the current champion ( 0.79 seconds )

Thanks,
Helmut.