Python/ Get some links from an Url

import urllib2
import re
#connect to a URL
url = raw_input('Enter url > ')
website = urllib2.urlopen(url)

#read html code
html = website.read()

#use re.findall to get all the links
links = re.findall('"((http|ftp)s?://.*?)"', html)
for a in links:
    if ("htm" in a[0]) and ('dtd' not in a[0]) and ('xhtml' not in a[0]):
        print a[0]