    description = 'Read transient data writen inside a vtkhdf file.'
    epilogue = ''''''
    parser = argparse.ArgumentParser(description=description, epilog=epilogue,
                                     formatter_class=argparse.RawDescriptionHelpFormatter)
    parser.add_argument('file_name', help='warping_spheres.vtkhdf')
    args = parser.parse_args()
    return args.file_name


def main():
