[BUG] 'NoneType' object has no attribute 'span'

arr = yt.streams.filter(only_video=True, file_extension='mp4')

line 292, in streams
    return StreamQuery(self.fmt_streams)
  File "...\Python39\lib\site-packages\pytube\__main__.py", line 177, in fmt_streams
    extract.apply_signature(stream_manifest, self.vid_info, self.js)
  File "...\Python39\lib\site-packages\pytube\extract.py", line 409, in apply_signature
    cipher = Cipher(js=js)
  File "...\Python39\lib\site-packages\pytube\cipher.py", line 44, in __init__
    self.throttling_array = get_throttling_function_array(js)
  File "...\Python39\lib\site-packages\pytube\cipher.py", line 323, in get_throttling_function_array
    str_array = throttling_array_split(array_raw)

  File "...\Python39\lib\site-packages\pytube\parser.py", line 158, in throttling_array_split
    match_start, match_end = match.span()
AttributeError: 'NoneType' object has no attribute 'span'

Pytube version: 11.0.1 Python 3.9.7

[Ammadhashmi]

Please re open this issue, I encountered the same error

[alexeichhorn]

seems to happen, because YouTube added functions without parameters in the javascript. e.g.:

function(){for(var d=64,e=[];++d-e.length-32;){switch(d){case 58:d-=14;case 91:case 92:case 93:continue;case 123:d=47;case 94:case 95:case 96:continue;case 46:d=95}e.push(String.fromCharCode(d))}return e}

So in my opinion the best fix would be to allow the regex to accept these too. That is, change the regex function\([^)]+\) to function\([^)]*\). The * allows the function to have no parameters.

So https://github.com/pytube/pytube/blob/f06e0710dcf5089e582487fee94f7bb0afbf7ba9/pytube/parser.py#L152 should be changed to

func_regex = re.compile(r"function\([^)]*\)")

Any opinion about that?