Jedi is an auto completion tool for Python. It works. With and without
syntax errors. Sometimes it sucks, but that's normal in dynamic languages.
But it sucks less than other tools. It understands almost all of the basic
Python syntax elements including many built-ins.

Jedi uses a very simple interface to connect with IDE's. As an reference,
there is a VIM implementation, which uses Jedi's auto completion. However,
I encourage you to use Jedi in your IDEs. Start writing plugins! If there are
problems with licensing, just contact me.