使用pytube下载YouTube视频时出现NoneType无span属性错误

这个错误是因为YouTube更新了视频流的加密逻辑，官方pytube版本的代码未适配新结构，导致get_throttling_plan函数匹配不到目标代码片段，返回None后调用span()引发异常。

修复步骤： #

1. 卸载当前版本的pytube：

pip uninstall pytube -y

2. 安装pytube官方仓库的最新修复版本：

pip install git+https://github.com/pytube/pytube.git

可选优化（针对受限视频）： #

如果下载部分需要验证的视频仍有问题，可在初始化YouTube对象时添加OAuth参数，让程序自动完成浏览器验证：

yt = YouTube(user_input, 
             on_progress_callback=progress_function, 
             on_complete_callback=completed_function,
             use_oauth=True,
             allow_oauth_cache=True)

原问题代码与报错信息： #

代码：

def progress_function(stream, chunk, bytes_remaining):
    print("Downloading")
def completed_function(stream, file_path):
    print("download completed")
    messagebox.showinfo(title="Download has completed", message="The video has successfully downloaded")
    

def download():
    user_input = str(link.get())
    yt = YouTube(user_input, on_progress_callback=progress_function, on_complete_callback=completed_function)
    print(yt.title)
    print(yt.thumbnail_url)
    video = yt.streams.get_highest_resolution()
    video.download()

报错信息：

Exception in Tkinter callback Traceback (most recent call last):
File "C:\Users\---\AppData\Local\Programs\Python\Python311\Lib\tkinter\__init__.py", line 1948,in __call__
     return self.func(*args)
            ^^^^^^^^^^^^^^^^
File "C:\Users\---\PycharmProjects\youtube downloader\main.py", line 30, in download
     video = yt.streams.get_highest_resolution()
             ^^^^^^^^^^
File "C:\Users\---\PycharmProjects\youtube downloader\venv\day\QuizGame\Lib\site-packages\pytube\__main__.py", line 296, in streams
     return StreamQuery(self.fmt_streams)
                        ^^^^^^^^^^^^^^^^
File "C:\Users\---\PycharmProjects\youtube downloader\venv\day\QuizGame\Lib\site-packages\pytube\__main__.py", line 181, in fmt_streams
     extract.apply_signature(stream_manifest, self.vid_info, self.js)
File "C:\Users\---\PycharmProjects\youtube downloader\venv\day\QuizGame\Lib\site-packages\pytube\extract.py", line 409, in apply_signature
     cipher = Cipher(js=js)
              ^^^^^^^^^^^^^
File "C:\Users\---\PycharmProjects\youtube downloader\venv\day\QuizGame\Lib\site-packages\pytube\cipher.py", line 29, in __init__
     self.throttling_plan = get_throttling_plan(js)
                            ^^^^^^^^^^^^^^^^^^^^^^^
File "C:\Users\---\PycharmProjects\youtube downloader\venv\day\QuizGame\Lib\site-packages\pytube\cipher.py", line 404, in get_throttling_plan
     transform_plan_raw = find_object_from_startpoint(raw_code, match.span()[1] - 1)
                                                                ^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'span'

内容的提问来源于stack exchange，提问作者Noran nm