extraer emails con python

#!/usr/bin/python
# -*- coding: UTF-8 -*-
#
#      PyImg2Text.py
#
#      Copyright 2009 Jorge J. Lopez C. <lowlifebob[arroba]gmail.com>
#
#      This program is free software; you can redistribute it and/or modify
#      it under the terms of the GNU General Public License as published by
#      the Free Software Foundation; either version 2 of the License, or
#      (at your option) any later version.
#
#      This program is distributed in the hope that it will be useful,
#      but WITHOUT ANY WARRANTY; without even the implied warranty of
#      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#      GNU General Public License for more details.
#
#      You should have received a copy of the GNU General Public License
#      along with this program; if not, write to the Free Software
#      Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
#      MA 02110-1301, USA.

import httplib
import re

const_dom = "www.nodo50.org"
const_url = "/cbc/lista.htm"
const_mailsrch = re.compile(r'[w-][w-.]+@[w-][w-.]+[a-zA-Z]{1,4}')

def download(dom, url):
   headers = {
            "User-Agent": "Mozilla/5.0 (X11; U; Linux i686; es-ES; \
             rv:1.9.0.3) Gecko/2008092416 Firefox/3.0.3",
            "Accept": "text/html,application/xhtml+xml,application/ \
            xml;q=0.9,*/*;q=0.8",
            "Accept-Language": "es-es,es;q=0.8,en-us;q=0.5,en;q=0.3",
            "Accept-Charset": "UTF-8,*",
            "Keep-Alive": "300",
            "Proxy-Connection": "keep-alive",
            }

   # conectamos con el servidor
   conn = httplib.HTTPConnection(dom, 80)
   # hacemos la peticion
   conn.request ("GET", url, None, headers)
   resp = conn.getresponse()
   return resp


def main():
   mails = []
   db = open('emails.txt', 'a')
   xml = download(const_dom, const_url).read()
   mails.extend(const_mailsrch.findall(xml))   
   
   for mail in mails:
      db.write(mail + 'n')
      print "Email:", mail
   db.close()

if __name__ == '__main__':
   main()