Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.python > #38382

Re: Curious to see alternate approach on a search/replace via regex

Show all headers | View raw

On Fri, 08 Feb 2013 09:45:41 +1100
Steven D'Aprano <steve+comp.lang.python@pearwood.info> wrote:

> rh wrote:
> 
> > I am using 2.7.3 and I put the re.compile outside the function and
> > it performed faster than urlparse. I don't print out the data.
> 
> I find that hard to believe. re.compile caches its results, so except
> for the very first time it is called, it is very fast -- basically a
> function call and a dict lookup. I find it implausible that a
> micro-optimization such as you describe could be responsible for
> speeding the code up by over 33%.

Not sure where you came up with that number. Maybe another post?
I never gave any numbers, just comparisons.

> 
> But since you don't demonstrate any actual working code, you could be
> correct, or you could be timing it wrong. Without seeing your timing
> code, my guess is that you are doing it wrong. Timing code is tricky,
> which is why I always show my work. If I get it wrong, someone will
> hopefully tell me. Otherwise, I might as well be making up the
> numbers.

re.compile
starttime = time.time()
for i in range(numloops):
    u2f()

msg = '\nElapsed {0:.3f}'.format(time.time() - starttime)
print(msg)

> 
> 
> 
> -- 
> Steven
> 


-- 

Back to comp.lang.python | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

Re: Curious to see alternate approach on a search/replace via regex Demian Brecht <demianbrecht@gmail.com> - 2013-02-06 13:55 -0800
  Re: Curious to see alternate approach on a search/replace via regex Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-02-07 03:04 +0000
    Re: Curious to see alternate approach on a search/replace via regex rh <richard_hubbe11@lavabit.com> - 2013-02-06 19:31 -0800
      Re: Curious to see alternate approach on a search/replace via regex Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-02-08 09:45 +1100
        Re: Curious to see alternate approach on a search/replace via regex rh <richard_hubbe11@lavabit.com> - 2013-02-07 15:13 -0800
          Re: Curious to see alternate approach on a search/replace via regex Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-02-08 10:59 +1100
            Re: Curious to see alternate approach on a search/replace via regex Ian Kelly <ian.g.kelly@gmail.com> - 2013-02-07 17:55 -0700
              Re: Curious to see alternate approach on a search/replace via regex Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-02-08 14:02 +1100
                Re: Curious to see alternate approach on a search/replace via regex rh <richard_hubbe11@lavabit.com> - 2013-02-07 21:35 -0800
            Re: Curious to see alternate approach on a search/replace via regex Ian Kelly <ian.g.kelly@gmail.com> - 2013-02-07 18:08 -0700
            Re: Curious to see alternate approach on a search/replace via regex rh <richard_hubbe11@lavabit.com> - 2013-02-07 21:57 -0800
            Re: Curious to see alternate approach on a search/replace via regex Ian Kelly <ian.g.kelly@gmail.com> - 2013-02-08 01:21 -0700
              Re: Curious to see alternate approach on a search/replace via regex Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2013-02-08 22:43 +1100
                Re: Curious to see alternate approach on a search/replace via regex Ian Kelly <ian.g.kelly@gmail.com> - 2013-02-08 09:26 -0700
            Re: Curious to see alternate approach on a search/replace via regex Serhiy Storchaka <storchaka@gmail.com> - 2013-02-15 22:58 +0200
            Re: Curious to see alternate approach on a search/replace via regex rh <richard_hubbe11@lavabit.com> - 2013-02-26 11:20 -0800
        Re: Curious to see alternate approach on a search/replace via regex Dave Angel <davea@davea.name> - 2013-02-08 01:27 -0500
    Re: Curious to see alternate approach on a search/replace via regex jmfauth <wxjmfauth@gmail.com> - 2013-02-07 03:08 -0800
      Re: Curious to see alternate approach on a search/replace via regex Chris Angelico <rosuav@gmail.com> - 2013-02-07 23:44 +1100

csiph-web