The middle sentence of the last paragraph of the documentation of 
urllib.request.urlopen is garbled, reading:
    "The urlopen function from the previous version, Python 2.6 and 
earlier, of the module urllib has been discontinued as urlopen can return 
the file-object as the previous."

Perhaps the easiest way to say what is intended is "urllib.request.urlopen 
replaces the function urllib.urlopen from versions of Python before 3.0".