AttributeError: module 'urllib' has no attribute 'urlopen' site:stackoverflow.com code example

Example: AttributeError: module 'urllib' has no attribute 'URLopener'

import urllib.request

with urllib.request.urlopen("http://www.python.org") as url:
    s = url.read()
    # I'm guessing this would output the html source code ?
    print(s)