Report download progress.

def report_progress(self):
        """Report download progress."""
        percent = self.calc_percent()
        total = format_bytes(self._total)

        speed = self.calc_speed()
        total_speed_report = '{0} at {1}'.format(total, speed)

        report = '\r{0: <56} {1: >30}'.format(percent, total_speed_report)

        if self._finished:
            print(report)
        else:
            print(report, end="")
        sys.stdout.flush()