编码utf-8时，Python urlencode正在丢失数据

Question

I have a simple urlencode to push data from my python to my php file.

    # -*- coding: utf-8 -*-
    import urllib,urllib2
    array={'test':'Ch\xe2teau'}
    test=urllib2.urlopen(urllib2.Request('http://localhost/link/php.php',urllib.urlencode(array,True))).read()
    print test

The array is utf-8 encoded. I am trying to pass to to my php file for use but it turns into a ?

Here is my result:

How can I prevent this data loss?