IPython dev here,

Thanks to you (and the author) for being happy users of IPython; but if you don't have complaints you are not using it enough :-) We do our best to provide good completion; but most of the work is thanks to Jedi (Dave Halter) for the completion and prompt_toolkit (Jonathan Slenders) for the UI , at least in terminal.

There is a lot of improvement that could be done to completion (time and funding missing), and we are always looking for Feedback and Pull Requests.

Side Note while I agree about the statement about Julia and bar(foo) vs foo.bar(); nothing prevent the completer to add text not at the cursor position. Having foo)<tab> suggesting to prepend `bar(` is a possibility.

(also hijacking top comment...)