Proxy user:pass authentication using httplib webrequest

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Python

Python2.7

Python3.3

Here is the sample code snippet -

conn = httplib.HTTPConnection("proxy_IP",proxy_port)
conn.set_tunnel(host,80)
conn.request("POST", parameter1, parameter2, parameter3)
response = conn.getresponse()

I am trying to tunnel the web request sent to my host through a proxy server. The problem is, this proxy server requires authentication with user:pass.

How do I implement it in python 2.7?

What I have tried:

Haven't tried anything. I need help.