From the the rlcompleter2 home page:
One of the best features of python is that you can use and learn it interactively. rlcompleter2 enhances this interactive experience. It is a major improvement over the rlcompleter module in the 2.2 standard lib. I recommend that you simply install it and see if you like it. User interface is simple: hit
I agree, and in my message to the 4Suite mailing list I demo how rlcompleter2 can be useful for navigating a complex API in interactive Python.