change a string conditional

[Ewald van Houte]

"obantec support" <spam at nomail.net> wrote in
news:udlaulccmpa3f5 at news.supernews.com: 

> Hi
> 
> I need to a piece of python code that will take a string which may or
> may not begin with www and change it to lists.
> 
> eg. www.domain.com becomes lists.domain.com
> but if domain1.com (no www) the it still becomes lists.domain1.com
> 
> an example of a pattern match will be enough.(I do a bit of perl but
> never done any python)
> 
> mark
> 
> 
> 

import re

def f(url):
    	return 'lists.' + re.sub('^www.\.','',url)

Testing it: 
>>> f('domain1.com')
'lists.domain1.com'
>>> f('www.domain.com')
'lists.domain.com'

Maybe better pattern possible, but too lazy now :p

HTH,
    	Ewald