You need to write a full Python parser to get similar intelligence in vim - and it would be difficult to do smoothly given that vim plugins can't communicate with a long-running process as the code-assist emacs plugins do (which is my biggest complaint about modern vim).

Alternatively, PyCharm has a vi plugin which isn't too bad (depending on which features of vim you expect).

I was looking for a similar solution and you will find your usual suspects:

* https://github.com/klen/python-mode * http://code.google.com/p/vim-python-ide/ * http://sontek.net/turning-vim-into-a-modern-python-ide

In the end ask yourself - which problem are you trying to solve by changing your IDE? If it can't be fixed in your current IDE, try something else.

I ended up going with Pycharm using Vim key bindings as it was easier for me to work on different machines and OSes without having to worry too much about setting up my environment.

just FYI, PyCharm has a plugin for vim emulation mode.