def configureCompletion(self) -> None:
        try:
            from jedi.utils import setup_readline
            setup_readline()
        except ImportError:
            # Fallback to the stdlib readline completer if it is installed.
            # Taken from http://docs.python.org/2/library/rlcompleter.html
            runtime.ui.info("jedi is not installed, falling back to readline"
                " for completion")
            try:
                import readline
                import rlcompleter
                readline.parse_and_bind("tab: complete")
            except ImportError:
                runtime.ui.info("readline is not installed either."
                    " No tab completion is enabled.")