Have you tried https://atom.io/packages/ide-python for autocompletion/inline documentation? It uses https://github.com/davidhalter/jedi. Also I'd be surprised if those things aren't done properly in VSCode with Python extension(s).

edit: Atom IDE (that this package links to) has been deprecated last week or so by Facebook, I'm not sure what dependencies packages like the above have on the atom-ide-ui.