How to use the argcomplete.__init__.CompletionFinder function in argcomplete

class ExclusiveCompletionFinder(CompletionFinder):
    @staticmethod
    def _action_allowed(action, parser):
        if not CompletionFinder._action_allowed(action, parser):
            return False

        append_classes = (argparse._AppendAction, argparse._AppendConstAction)
        if action._orig_class in append_classes:
            return True

        if action not in parser._seen_non_default_actions:
            return True

        return False

autocomplete = CompletionFinder()
autocomplete.__doc__ = """ Use this to access argcomplete. See :meth:`argcomplete.CompletionFinder.__call__()`. """

def warn(*args):
    """
    Prints **args** to standard error when running completions. This will interrupt the user's command line interaction;
    use it to indicate an error condition that is preventing your completer from working.
    """
    print("\n", file=debug_stream, *args)

def _action_allowed(action, parser):
        if not CompletionFinder._action_allowed(action, parser):
            return False

        append_classes = (argparse._AppendAction, argparse._AppendConstAction)
        if action._orig_class in append_classes:
            return True

        if action not in parser._seen_non_default_actions:
            return True

        return False

else:
                        print("    ".join(k for k in sorted(_display_completions)))
                else:
                    print(" ".join(x for x in sorted(matches)))

                import readline
                print("cli /> {0}".format(readline.get_line_buffer()), end="")
                readline.redisplay()

            ...
            readline.set_completion_display_matches_hook(display_completions)

        """
        return {" ".join(k): v for k, v in self._display_completions.items()}

class ExclusiveCompletionFinder(CompletionFinder):
    @staticmethod
    def _action_allowed(action, parser):
        if not CompletionFinder._action_allowed(action, parser):
            return False

        append_classes = (argparse._AppendAction, argparse._AppendConstAction)
        if action._orig_class in append_classes:
            return True

        if action not in parser._seen_non_default_actions:
            return True

        return False

autocomplete = CompletionFinder()
autocomplete.__doc__ = """ Use this to access argcomplete. See :meth:`argcomplete.CompletionFinder.__call__()`. """