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.