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Re: relative speed of incremention syntaxes (or "i=i+1" VS "i+=1")

From Emile van Sebille <emile@fenx.com>
Subject Re: relative speed of incremention syntaxes (or "i=i+1" VS "i+=1")
Date 2011-08-22 09:35 -0700
References (1 earlier) <1313947658.3424.3.camel@thegeorge> <mailman.285.1313955635.27778.python-list@python.org> <mailman.287.1313956392.27778.python-list@python.org> <4e51ad16$0$29975$c3e8da3$5496439d@news.astraweb.com> <CALMxxxkLE9G6_3yLh3rwRBAbqr1Zi3_-dLkD0yTQ8JJXZxCkmA@mail.gmail.com>
Newsgroups comp.lang.python
Message-ID <mailman.321.1314030982.27778.python-list@python.org> (permalink)

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On 8/22/2011 2:55 AM Richard D. Moores said...
> I couldn't resist giving it a try. Using Python 3.2.1 on a 64-bit
> Windows 7 machine with a 2.60 gigahertz AMD Athlon II X4 620
> processor, I did 18 tests, alternating between n=n+1 and n+=1 (so 9
> each).
>
> The fastest for n+=1 was
> C:\Windows\System32>  python -m timeit  -r 3 -s "n=0" "n += 1"
> 10000000 loops, best of 3: 0.0879 usec per loop
>
> The slowest for n+=1 was
> C:\Windows\System32>  python -m timeit  -r 3 -s "n=0" "n += 1"
> 10000000 loops, best of 3: 0.0902 usec per loop
>
> The fastest for n = n + 1 was
> C:\Windows\System32>  python -m timeit  -r 3 -s "n=0" "n=n+1"
> 10000000 loops, best of 3: 0.0831 usec per loop
>
> The slowest for n = n + 1 was
> C:\Windows\System32>  python -m timeit  -r 3 -s "n=0" "n=n+1"
> 10000000 loops, best of 3: 0.0842 usec per loop
>
> Coincidence?
>

Naaa.. I just ran it twice -- once per ... _this_ is coincidence.  :)

Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

C:\Documents and Settings\Emile>python -m timeit  -r 3 -s "n=0" "n=n+1"
10000000 loops, best of 3: 0.108 usec per loop

C:\Documents and Settings\Emile>python -m timeit  -r 3 -s "n=0" "n += 1"
10000000 loops, best of 3: 0.108 usec per loop

C:\Documents and Settings\Emile>

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Re: relative speed of incremention syntaxes (or "i=i+1" VS "i+=1") Andreas Löscher <andreas.loescher@s2005.tu-chemnitz.de> - 2011-08-21 19:27 +0200
  Re: relative speed of incremention syntaxes (or "i=i+1" VS "i+=1") Laurent <laurent.payot@gmail.com> - 2011-08-21 10:48 -0700
    Re: relative speed of incremention syntaxes (or "i=i+1" VS "i+=1") Laurent <laurent.payot@gmail.com> - 2011-08-21 11:03 -0700
  Re: relative speed of incremention syntaxes (or "i=i+1" VS "i+=1") Christian Heimes <lists@cheimes.de> - 2011-08-21 20:24 +0200
    Re: relative speed of incremention syntaxes (or "i=i+1" VS "i+=1") Roy Smith <roy@panix.com> - 2011-08-21 14:52 -0400
      Re: relative speed of incremention syntaxes (or "i=i+1" VS "i+=1") Andreas Löscher <andreas.loescher@s2005.tu-chemnitz.de> - 2011-08-22 01:17 +0200
        Re: relative speed of incremention syntaxes (or "i=i+1" VS "i+=1") Chris Angelico <rosuav@gmail.com> - 2011-08-22 00:37 +0100
        Re: relative speed of incremention syntaxes (or "i=i+1" VS "i+=1") Terry Reedy <tjreedy@udel.edu> - 2011-08-21 19:38 -0400
          Re: relative speed of incremention syntaxes (or "i=i+1" VS "i+=1") Andreas Löscher <andreas.loescher@s2005.tu-chemnitz.de> - 2011-08-22 02:00 +0200
        Re: relative speed of incremention syntaxes (or "i=i+1" VS "i+=1") Seebs <usenet-nospam@seebs.net> - 2011-08-22 05:33 +0000
  Re: relative speed of incremention syntaxes (or "i=i+1" VS "i+=1") Terry Reedy <tjreedy@udel.edu> - 2011-08-21 15:39 -0400
    Re: relative speed of incremention syntaxes (or "i=i+1" VS "i+=1") Laurent <laurent.payot@gmail.com> - 2011-08-21 12:53 -0700
      Re: relative speed of incremention syntaxes (or "i=i+1" VS "i+=1") Laurent <laurent.payot@gmail.com> - 2011-08-21 12:55 -0700
      Re: relative speed of incremention syntaxes (or "i=i+1" VS "i+=1") Laurent <laurent.payot@gmail.com> - 2011-08-21 12:55 -0700
      Re: relative speed of incremention syntaxes (or "i=i+1" VS "i+=1") Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-08-22 11:12 +1000
        Re: relative speed of incremention syntaxes (or "i=i+1" VS "i+=1") "Richard D. Moores" <rdmoores@gmail.com> - 2011-08-22 02:55 -0700
        Re: relative speed of incremention syntaxes (or "i=i+1" VS "i+=1") Emile van Sebille <emile@fenx.com> - 2011-08-22 09:35 -0700
        Re: relative speed of incremention syntaxes (or "i=i+1" VS "i+=1") Emile van Sebille <emile@fenx.com> - 2011-08-22 10:22 -0700
    Re: relative speed of incremention syntaxes (or "i=i+1" VS "i+=1") Laurent <laurent.payot@gmail.com> - 2011-08-21 13:04 -0700
    Re: relative speed of incremention syntaxes (or "i=i+1" VS "i+=1") Laurent <laurent.payot@gmail.com> - 2011-08-21 12:53 -0700
      Re: relative speed of incremention syntaxes (or "i=i+1" VS "i+=1") Andreas Löscher <andreas.loescher@s2005.tu-chemnitz.de> - 2011-08-22 01:25 +0200
        Re: relative speed of incremention syntaxes (or "i=i+1" VS "i+=1") Chris Angelico <rosuav@gmail.com> - 2011-08-22 00:41 +0100
          Re: relative speed of incremention syntaxes (or "i=i+1" VS "i+=1") Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-08-22 11:16 +1000
        Re: relative speed of incremention syntaxes (or "i=i+1" VS "i+=1") Christian Heimes <lists@cheimes.de> - 2011-08-22 04:04 +0200
        Re: relative speed of incremention syntaxes (or "i=i+1" VS "i+=1") Terry Reedy <tjreedy@udel.edu> - 2011-08-21 22:11 -0400
      Re: relative speed of incremention syntaxes (or "i=i+1" VS "i+=1") Stephen Hansen <me+list/python@ixokai.io> - 2011-08-21 19:08 -0700
        Re: relative speed of incremention syntaxes (or "i=i+1" VS "i+=1") Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2011-08-22 14:14 +1000
          Re: relative speed of incremention syntaxes (or "i=i+1" VS "i+=1") Stephen Hansen <me+list/python@ixokai.io> - 2011-08-21 21:37 -0700
          Re: relative speed of incremention syntaxes (or "i=i+1" VS "i+=1") Stephen Hansen <me+list/python@ixokai.io> - 2011-08-21 21:49 -0700
  Re: relative speed of incremention syntaxes (or "i=i+1" VS "i+=1") casevh <casevh@gmail.com> - 2011-08-21 21:14 -0700

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