login with urllib2

[守株待兔]

please to see my code: 
import urllib
import urllib2

url = 'http://hi.baidu.com/'
values = {'username' : '******','password' : '******' }

data = urllib.urlencode(values)
req = urllib2.Request(url,data)
response = urllib2.urlopen(req)
the_page = response.read()

i can't to login ,why?username and password  are  right.
any word  appreciated.
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