--pelt: print number of detected changepoints

    if args.pelt:

        changepoints = detect_changepoints(dlog, num_samples=args.pelt)

        for i, slot in enumerate(changepoints):

            for unit in slot:

                num_changepoints = len(slot[unit])

                print(

                    f"Found {num_changepoints} changepoints for {dlog.slots[i][unit].smu} {unit}"

                )

    if args.json_export:

        extra_data = dict()