Proxy chain in python, socks

[kompexecutor]

Hi, I am looking for way of building proxy chain in python and found not much information i.e:

import urllib2
import socks
socks.setdefaultproxy(socks.PROXY_TYPE_SOCKS4, 'proxie', port)
socks.wrapmodule(urllib2)
yy = urllib2.urlopen('http://www.yahoo.com').read()

is showing "URLError: <urlopen error [Errno 10054] >" error

Please anyone write link, or some information how to build proxy chain in python.

Regards,
Ihor