Speeding up a script -- looking for ideas

Erik Max Francis max at alcyone.com
Sun Oct 20 10:38:59 CEST 2002


Richard Bow wrote:

> I'm hoping to get some hints for significantly speeding up the below
> script. I've found 43 integers between 1 and 1,000,000 that satisfy
> the
> condition, and would like to push on toward 10,000,000 in hopes of
> finding
> an integer for which there are 3 pairs. Of course, another reason for
> asking is to learn more Python from you guys.

One obvious optimization is that you're using range with huge values,
which is going to be expensive -- range returns a list, so calling it
with large values will create an enormous list, which is wasteful if all
you plan on doing is enumerating it.  Try using xrange, or iterating
manually instead.

-- 
 Erik Max Francis / max at alcyone.com / http://www.alcyone.com/max/
 __ San Jose, CA, USA / 37 20 N 121 53 W / &tSftDotIotE
/  \ The doors of Heaven and Hell are adjacent and identical.
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