Re: Python 3.3 vs. MSDOS Basic

Newsgroups	comp.lang.python
Date	2013-02-18 17:47 -0800
References	<e8a634af-4e29-4f45-b327-2dfd1fab5269@googlegroups.com> <mailman.1985.1361234188.2939.python-list@python.org>
Subject	Re: Python 3.3 vs. MSDOS Basic
From	John Immarino <johimm@gmail.com>
Message-ID	<mailman.1992.1361238473.2939.python-list@python.org> (permalink)

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> 
> > max=0
> 
> 
> 
> 	"max" is a bad name -- it masks the built-in max() function
> 
> 
> 
> > m=0
> 
> > while m<=1000000:
> 
> >     m+=1
> 
> 
> 
> 	Since "m" is only modified here and has a value of 1 for the first
> 
> pass through, you can replace those three lines with
> 
> 
> 
> for m in xrange(1, 1000001): #python 2.x, just use range() for 3.x
> 
> 
> 
> >     count=0
> 
> >     n=m
> 
> 
> 
> >     while n!=1:
> 
> >         count+=1
> 
> >         if n%2==0:
> 
> >             n=n//2
> 
> >         else:
> 
> >             n=3*n+1
> 
> 
> 
> 	Avoid the comparison to 0 by reversing the then/else actions... Any
> 
> 0 result is false.
> 
> 
> 
> -=-=-=-=-
> 
> import time
> 
> 
> 
> mx = 0
> 
> 
> 
> start = time.time()
> 
> for m in xrange(1, 1000001):
> 
>     count = 0
> 
>     n = m
> 
>     while n > 1:
> 
>         count += 1
> 
>         if n % 2:   # 0 means false
> 
>             n = 3 * n + 1
> 
>         else:
> 
>             n = n // 2
> 
> 
> 
>     if count > mx:
> 
>         mx, num = count, m
> 
> 
> 
> end = time.time()
> 
> 
> 
> print num, mx
> 
> print end-start
> 
> -=-=-=-=-
> 
> Microsoft Windows XP [Version 5.1.2600]
> 
> (C) Copyright 1985-2001 Microsoft Corp.
> 
> 
> 
> E:\UserData\Wulfraed\My Documents>cd "Python Progs"
> 
> 
> 
> E:\UserData\Wulfraed\My Documents\Python Progs>Script1.py
> 
> 837799 524
> 
> 83.2030000687
> 
> 
> 
> E:\UserData\Wulfraed\My Documents\Python Progs>
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> -- 
> 
> 	Wulfraed                 Dennis Lee Bieber         AF6VN
> 
>         wlfraed@ix.netcom.com    HTTP://wlfraed.home.netcom.com/

Thanks, your suggestions are well taken.

Thread

Python 3.3 vs. MSDOS Basic John Immarino <johimm@gmail.com> - 2013-02-18 11:13 -0800
  Re: Python 3.3 vs. MSDOS Basic Chris Angelico <rosuav@gmail.com> - 2013-02-19 08:55 +1100
  Re: Python 3.3 vs. MSDOS Basic Ian Kelly <ian.g.kelly@gmail.com> - 2013-02-18 14:54 -0700
    Re: Python 3.3 vs. MSDOS Basic Tim Daneliuk <tundra@tundraware.com> - 2013-02-19 08:46 -0600
      Re: Python 3.3 vs. MSDOS Basic Ian Kelly <ian.g.kelly@gmail.com> - 2013-02-19 11:31 -0700
        Re: Python 3.3 vs. MSDOS Basic Tim Daneliuk <tundra@tundraware.com> - 2013-02-20 08:21 -0600
          Re: Python 3.3 vs. MSDOS Basic Ian Kelly <ian.g.kelly@gmail.com> - 2013-02-20 11:38 -0700
            Re: Python 3.3 vs. MSDOS Basic Tim Daneliuk <tundra@tundraware.com> - 2013-02-20 16:49 -0600
              Re: Python 3.3 vs. MSDOS Basic Tim Daneliuk <tundra@tundraware.com> - 2013-02-20 16:59 -0600
      Re: Python 3.3 vs. MSDOS Basic Serhiy Storchaka <storchaka@gmail.com> - 2013-02-19 22:28 +0200
      Re: Python 3.3 vs. MSDOS Basic Chris Angelico <rosuav@gmail.com> - 2013-02-20 08:39 +1100
        Re: Python 3.3 vs. MSDOS Basic Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2013-02-20 18:32 +1300
  Re: Python 3.3 vs. MSDOS Basic Chris Angelico <rosuav@gmail.com> - 2013-02-19 08:56 +1100
  Re: Python 3.3 vs. MSDOS Basic Chris Angelico <rosuav@gmail.com> - 2013-02-19 08:58 +1100
    Re: Python 3.3 vs. MSDOS Basic John Immarino <johimm@gmail.com> - 2013-02-18 17:39 -0800
      Re: Python 3.3 vs. MSDOS Basic Chris Angelico <rosuav@gmail.com> - 2013-02-19 14:01 +1100
        Re: Python 3.3 vs. MSDOS Basic Nick Mellor <thebalancepro@gmail.com> - 2013-02-18 20:17 -0800
        Re: Python 3.3 vs. MSDOS Basic Nick Mellor <thebalancepro@gmail.com> - 2013-02-18 20:17 -0800
    Re: Python 3.3 vs. MSDOS Basic John Immarino <johimm@gmail.com> - 2013-02-18 17:39 -0800
      Re: Python 3.3 vs. MSDOS Basic Neil Cerutti <neilc@norwich.edu> - 2013-02-20 17:06 +0000
  Re: Python 3.3 vs. MSDOS Basic Chris Angelico <rosuav@gmail.com> - 2013-02-19 09:01 +1100
  Re: Python 3.3 vs. MSDOS Basic Ian Kelly <ian.g.kelly@gmail.com> - 2013-02-18 15:15 -0700
  Re: Python 3.3 vs. MSDOS Basic Alexander Blinne <news@blinne.net> - 2013-02-19 01:11 +0100
  Re: Python 3.3 vs. MSDOS Basic Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2013-02-18 19:36 -0500
    Re: Python 3.3 vs. MSDOS Basic John Immarino <johimm@gmail.com> - 2013-02-18 17:47 -0800
    Re: Python 3.3 vs. MSDOS Basic John Immarino <johimm@gmail.com> - 2013-02-18 17:47 -0800
  Re: Python 3.3 vs. MSDOS Basic Terry Reedy <tjreedy@udel.edu> - 2013-02-18 19:50 -0500
    Re: Python 3.3 vs. MSDOS Basic Piet van Oostrum <piet@vanoostrum.org> - 2013-02-19 12:42 +0100
      Re: Python 3.3 vs. MSDOS Basic Alexander Blinne <news@blinne.net> - 2013-02-20 01:23 +0100
        Re: Python 3.3 vs. MSDOS Basic Ian Kelly <ian.g.kelly@gmail.com> - 2013-02-19 18:04 -0700
  Re: Python 3.3 vs. MSDOS Basic Terry Reedy <tjreedy@udel.edu> - 2013-02-19 00:28 -0500
  Re: Python 3.3 vs. MSDOS Basic Anssi Saari <as@sci.fi> - 2013-02-19 12:52 +0200
  Re: Python 3.3 vs. MSDOS Basic Serhiy Storchaka <storchaka@gmail.com> - 2013-02-19 13:13 +0200
  Re: Python 3.3 vs. MSDOS Basic Olive <diolu.remove_this_part@bigfoot.com> - 2013-02-19 15:02 +0100

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