利用python 提取字幕的文字

filename = '12 - 使用 Pandas 绘图 - lang_zh-CN.srt'
with open(filename, encoding='UTF-8') as file_obj:
    for line in file_obj:
        line = line.strip()
        if len(line) and not line.isdigit():
            first_str = line[0:1]
            if not first_str.isdigit():
                print(line)