How do I use urllib2 in python for Basic HTTTP Authentication?

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Python

Base64

authentication

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Hey guys, I am trying to solve one of the problems in the authentication section of pentesterlabs but I just can't seem to get it right. In essence, I am trying to use the urllib2 library in python for basic HTTP authentication, however despite providing the correct username and password I keep getting a 401: Unauthorized error. I even print out the header to make sure that it is correct, and I also base64 encoded it separately and it also seems to be correct. Can anybody please show me where I am going wrong?

#The code I have written Authentication, HTTP, Basic, Authentication, so far
import urllib2
import base64
theurl = 'http://10.42.0.11/authentication/example2'
request = urllib2.Request(theurl)
try:
  handle = urllib2.urlopen(request)
except IOError, e:
  if hasattr(e, 'code'):
    if e.code != 401:
      print 'Something is seriously wrong, you got a different error.'
      print e.code
    else:
      print e.headers
      print e.headers['www-authenticate']
#The credentials for login in are hacker:pentesterlab
#Below you can see the base64 encoded version of the credentials
request.add_header("Authorization", "Basic %s"%"aGFja2VyOnBlbnRlc3RlcmxhYgo=") 
print request.headers
handle = urllib2.urlopen(request)