The completer Completion API has seen an overhaul. The old
Completer.complete() API is waiting deprecation and will soon be replaced
by Completer.completions().
This new API is capable of pulling completions from :any:`jedi`, thus allowing type inference on non-executed code. If :any:`jedi` is installed completion like the following are now becoming possible without code evaluation:
>>> data = ['Number of users', 123_456] ... data[0].<tab>
IPython is now capable of inferring that data[0] is a string, and will suggest completions like .capitalize. The completion power of IPython will increase with new Jedi releases, and a number of bugs and more completions are already available on development version of :any:`jedi` if you are curious.
User of the prompt_toolkit interface should also see the type of the item they are selecting (method, attribute, module, keyword ...).
The use of Jedi also full fill a number of request and fix a number of bugs like case insensitive completion, completion after division operator: See :ghpull:`ipython/ipython#10182`.
Extra patches and updates will be needed to the :any:`ipykernel` package for this feature to be available for this to be available to other clients like Notebook, Lab, Nteract, Hydrogen...