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From: rh <richard_hubbe11@lavabit.com>
Subject: Re: Curious to see alternate approach on a search/replace via regex
Date: Thu, 7 Feb 2013 21:35:33 -0800
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Xref: csiph.com comp.lang.python:38406

On Fri, 08 Feb 2013 14:02:14 +1100
Steven D'Aprano <steve+comp.lang.python@pearwood.info> wrote:

> Ian Kelly wrote:
> 
> > On Thu, Feb 7, 2013 at 4:59 PM, Steven D'Aprano
> > <steve+comp.lang.python@pearwood.info> wrote:
> >> Oh, one last thing... pulling out "re.compile" outside of the
> >> function does absolutely nothing. You don't even compile anything.
> >> It basically looks up that a compile function exists in the re
> >> module, and that's all.
> > 
> > Using Python 2.7:
> [...]
> > Whatever caching is being done by re.compile, that's still a 24%
> > savings by moving the compile calls into the setup.
> 
> That may or may not be the case, but rh didn't compile anything. He
> moved "re.compile" literally, with no arguments, out of the timing
> code. That clearly does nothing except confirm that re.compile exists.

My initial post has the function and in there are two re.compile calls.
I moved those out of the function and see repeatable time efficiency
improvements.

FWIW the fastest so far was posted by Peter Otten and didn't
use regex.

As a new learner of python (or any language) I like to know what
habits will serve me well into the future. So the only reason I look
at the time it takes is as a sanity check to make sure I'm not
learning bad habits.  In this case someone else pointed out time
comparisons and off the thread went into timings!

I did take note of your previous post using timeit and filed
that away into the gray matter for some other day.

> 
> 
> 
> -- 
> Steven
> 


--