def ucas_download_playlist(url, output_dir = '.', merge = False, info_only = False, **kwargs):
    '''course page'''
    html = get_content(url)

    parts = re.findall( r'(getplaytitle.do\?.+)"', html)
    assert parts, 'No part found!'

    for part_path in parts:
        ucas_download('http://v.ucas.ac.cn/course/' + part_path, output_dir=output_dir, merge=merge, info_only=info_only)
course page