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To: python-list@python.org
From: Dennis Lee Bieber <wlfraed@ix.netcom.com>
Subject: Re: Python 3.3 vs. MSDOS Basic
Date: Mon, 18 Feb 2013 19:36:21 -0500
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Xref: csiph.com comp.lang.python:39147

On Mon, 18 Feb 2013 11:13:04 -0800 (PST), John Immarino
<johimm@gmail.com> declaimed the following in gmane.comp.python.general:

> I coded a Python solution for Problem #14 on the Project Euler website. I was very surprised to find that it took 107 sec. to run even though it's a pretty simple program.  I also coded an equivalent solution for the problem in the old MSDOS basic. (That's the 16 bit app of 1980s vintage.)  It ran in 56 sec. Is there a flaw in my coding, or is Python really this slow in this particular application. MSDOS Basic usually runs at a snails pace compared to Python.
> 
	<snip> 
> 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/