如何在python 3.0中通过授权在http上下载文件，解决bug？

如何在python 3.0中通过授权在http上下载文件，解决bug？

直接来自Py3k文档：http
://docs.python.org/dev/py3k/library/urllib.request.html#examples

import urllib.request# Create an OpenerDirector with support for Basic HTTP Authentication...auth_handler = urllib.request.HTTPBasicAuthHandler()auth_handler.add_password(realm='PDQ Application',    uri='https://mahler:8092/site-updates.py',    user='klem',    passwd='kadidd!ehopper')opener = urllib.request.build_opener(auth_handler)# ...and install it globally so it can be used with urlopen.urllib.request.install_opener(opener)urllib.request.urlopen('http://www.example.com/login.html')