Using ctags and Vim is a lethal combination, especially when doing bigger projects.
Using them gives you the following features:
- Impressive class/function/method search
- Ability to go to the definition of a function with one click (even in dynamic languages like Python)
- Better overview by a module browser (where you can see classes and members)
Getting started with Taglist
Tag list opens a left window where you can browse the current file. It gives a nice overview. Here is an example (click for a bigger picture):