Code execution in imported modules

[Casey McGinty]

On Thu, May 29, 2008 at 2:43 PM, Eric Wertman <ewertman at gmail.com> wrote:

> So I'm working on some file parsing and building up a stack of regular
> expressions that I need to use.  I was thinking of dropping them in an
> external module.  I was wondering.. if I put them in a file called
> regex.py like so :
>
> import re
>
> re1 = "..
> re2 = "..
>
> and then do:
>
> rgx1 = re.compile(re1)
> rgx2 = re.compile(re2)
>
>
> and, in my script, parse.py py I do:
>
> from regex import *
>
> text = "bunch of stuff......."
>
> m = rgx1.search(text)
>
>
> Does the re get compiled when I import it, or every time I call it?
> Since I'm calling it often, I'd like to compile it once.
>
> Thanks!
> --
> http://mail.python.org/mailman/listinfo/python-list
>

Please correct me if I am wrong ...
but I believe this should work, and rgx's will only be compiled on the first
import. You could also place them in a class and get the same effect when
you instantiate the class.

class MyRegEx( object ):
    re1 = "..
    re2 = "..
    rgx1 = re.compile(re1)
    rgx2 = re.compile(re2)
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