Proper auto-complete IDE

Is there any way to make place-holders with the classes/methods names and documentation? Pydev at least has a way to get that info. It would probably work with other IDEs too.

For me the best thing about the Java platform is how good the auto-complete works in Eclipse/Netbeans and how well documented everything is. I know this is harder dynamic typed languages, but Aptana works rather well with Javascript and python is theoretically simpler (no prototype object orientation).