This code not change browser ip. 2ip.ru show my real ip.
import spynner
def main():
b = spynner.Browser(user_agent='Opera/9.80 (Windows NT 6.1; U; ru) Presto/2.8.131 Version/11.10')
b.set_proxy("91.208.__.__:8080")
b.load('http://2ip.ru')
b.browse()
if __name__ == '__main__':
main()