We've found an error in an urllib2 example with Proxy Basic
authentication. This is the example with the error:
{{{
This example replaces the default ProxyHandler with one that uses
programmatically-supplied proxy URLs, and adds proxy authorization
support with ProxyBasicAuthHandler.

proxy_handler = urllib2.ProxyHandler({'http':
'http://www.example.com:3128/'})
proxy_auth_handler = urllib2.HTTPBasicAuthHandler()
proxy_auth_handler.add_password('realm', 'host', 'username', 'password')

opener = build_opener(proxy_handler, proxy_auth_handler)
# This time, rather than install the OpenerDirector, we use it directly:
opener.open('http://www.example.com/login.html')
}}}

Attached you will find a patch with the fix.

Fixed it in r77018 and merges.