Here I got a very neat plugin for vim which is awesome indeed.
It's from youtube years before.
So let's check this out. :)
http://www.youtube.com/watch?v=67OZNp9Z0CQ&noredirect=1
you can download the reference tools here: https://github.com/klen/python-mode#how-to-install
Someone mentioned about other alternatives such as vim-jedi, haven't tried through.
The vim plugin mentioned above is very nice along with other plugins. :)