whats the error in this code in python 3.0 as this is running 2.0 pyhon

[ekansh]

my question here

import urllib
import re
urls=[]
i=0
regex='<title>(.+?)</title>'
pattern=re.compile(regex)
while i<len(urls):
   htmlfile=urllib.urlopen(urls[i])
   a=htmlfile.read()
   titles=re.findall(pattern,a)
   print titles
   i=i+1