How to use the b2sdk.utils.format_and_scale_number function in b2sdk

def _check_one(self, expected, x):
        self.assertEqual(expected, b2sdk.utils.format_and_scale_number(x, 'B'))

elif not self.compare_done:
                    message = ' compare: %d/%d files   updated: %d files   %s   %s' % (
                        self.compare_count,
                        self.local_file_count,
                        self.transfer_files,
                        format_and_scale_number(self.transfer_bytes, 'B'),
                        format_and_scale_number(rate, 'B/s')
                    )  # yapf: disable
                else:
                    message = ' compare: %d/%d files   updated: %d/%d files   %s   %s' % (
                        self.compare_count,
                        self.local_file_count,
                        self.transfer_files,
                        self.total_transfer_files,
                        format_and_scale_fraction(self.transfer_bytes, self.total_transfer_bytes, 'B'),
                        format_and_scale_number(rate, 'B/s')
                    )  # yapf: disable
                self._print_line(message, False)

def _update_progress(self):
        if not self.closed and not self.no_progress:
            now = time.time()
            interval = now - self._last_update_time
            if self.UPDATE_INTERVAL <= interval:
                self._last_update_time = now
                time_delta = time.time() - self.start_time
                rate = 0 if time_delta == 0 else int(self.transfer_bytes / time_delta)
                if not self.local_done:
                    message = ' count: %d files   compare: %d files   updated: %d files   %s   %s' % (
                        self.local_file_count,
                        self.compare_count,
                        self.transfer_files,
                        format_and_scale_number(self.transfer_bytes, 'B'),
                        format_and_scale_number(rate, 'B/s')
                    )  # yapf: disable
                elif not self.compare_done:
                    message = ' compare: %d/%d files   updated: %d files   %s   %s' % (
                        self.compare_count,
                        self.local_file_count,
                        self.transfer_files,
                        format_and_scale_number(self.transfer_bytes, 'B'),
                        format_and_scale_number(rate, 'B/s')
                    )  # yapf: disable
                else:
                    message = ' compare: %d/%d files   updated: %d/%d files   %s   %s' % (
                        self.compare_count,
                        self.local_file_count,
                        self.transfer_files,
                        self.total_transfer_files,
                        format_and_scale_fraction(self.transfer_bytes, self.total_transfer_bytes, 'B'),

rate = 0 if time_delta == 0 else int(self.transfer_bytes / time_delta)
                if not self.local_done:
                    message = ' count: %d files   compare: %d files   updated: %d files   %s   %s' % (
                        self.local_file_count,
                        self.compare_count,
                        self.transfer_files,
                        format_and_scale_number(self.transfer_bytes, 'B'),
                        format_and_scale_number(rate, 'B/s')
                    )  # yapf: disable
                elif not self.compare_done:
                    message = ' compare: %d/%d files   updated: %d files   %s   %s' % (
                        self.compare_count,
                        self.local_file_count,
                        self.transfer_files,
                        format_and_scale_number(self.transfer_bytes, 'B'),
                        format_and_scale_number(rate, 'B/s')
                    )  # yapf: disable
                else:
                    message = ' compare: %d/%d files   updated: %d/%d files   %s   %s' % (
                        self.compare_count,
                        self.local_file_count,
                        self.transfer_files,
                        self.total_transfer_files,
                        format_and_scale_fraction(self.transfer_bytes, self.total_transfer_bytes, 'B'),
                        format_and_scale_number(rate, 'B/s')
                    )  # yapf: disable
                self._print_line(message, False)

def _update_progress(self):
        if not self.closed and not self.no_progress:
            now = time.time()
            interval = now - self._last_update_time
            if self.UPDATE_INTERVAL <= interval:
                self._last_update_time = now
                time_delta = time.time() - self.start_time
                rate = 0 if time_delta == 0 else int(self.transfer_bytes / time_delta)
                if not self.local_done:
                    message = ' count: %d files   compare: %d files   updated: %d files   %s   %s' % (
                        self.local_file_count,
                        self.compare_count,
                        self.transfer_files,
                        format_and_scale_number(self.transfer_bytes, 'B'),
                        format_and_scale_number(rate, 'B/s')
                    )  # yapf: disable
                elif not self.compare_done:
                    message = ' compare: %d/%d files   updated: %d files   %s   %s' % (
                        self.compare_count,
                        self.local_file_count,
                        self.transfer_files,
                        format_and_scale_number(self.transfer_bytes, 'B'),
                        format_and_scale_number(rate, 'B/s')
                    )  # yapf: disable
                else:
                    message = ' compare: %d/%d files   updated: %d/%d files   %s   %s' % (
                        self.compare_count,
                        self.local_file_count,
                        self.transfer_files,
                        self.total_transfer_files,