[BUG] Failure to parse transform_plan due to key of "do" which is a keyword

Before creating an issue Yes I have updated to the latest version

Describe the bug Errors at var, _ = self.transform_plan[0].split(".") due to transform_plan looking like this:

['Mx["do"](a,17)', 'Mx.FH(a,61)', 'Mx.xK(a,3)', 'Mx["do"](a,12)', 'Mx.xK(a,1)', 'Mx.FH(a,37)', 'Mx["do"](a,47)', 'Mx.FH(a,6)']

Attempted the most naive fix I could think of:

self.transform_plan: List[str] = [x.replace("[\"", ".").replace("\"]", "") for x in get_transform_plan(js)]

results in

File "/home/lachie/anaconda3/envs/spotdl/lib/python3.9/site-packages/pytube/cipher.py", line 55, in get_signature
    signature = self.transform_map[name](signature, argument)
KeyError: 'do'

Which is no surprise at all and I didn’t expect it to work.

To Reproduce Please provide the following information:

• The video or playlist url that is causing the error.
  • Every url I have tried so far gives this error because the transform plan is always the same.
• The code where the problem is occurring.
  • see above, but it’s in cypher.py in Cypher.__init__

Expected behavior This is an unhandled edge case, so I expect it to fail every time

Output

(spotdl) xxx@yyy:~$ spotdl https://open.spotify.com/track/5JWPUEov2wlX7c0jhYZpeB?si=wm_lePrPQdWoPoknBas1RA
Fetching Song...
Searching for: Tame Impala - Lost In Yesterday
  0%|                                                                               |ETA: ?, ~min/songTraceback (most recent call last):
  File "/home/xxx/anaconda3/envs/spotdl/bin/spotdl", line 8, in <module>
    sys.exit(console_entry_point())
  File "/home/xxx/anaconda3/envs/spotdl/lib/python3.9/site-packages/spotdl/__main__.py", line 99, in console_entry_point
    downloader.download_single_song(song)
  File "/home/xxx/anaconda3/envs/spotdl/lib/python3.9/site-packages/spotdl/download/downloader.py", line 69, in download_single_song
    self._download_asynchronously([songObj])
  File "/home/xxx/anaconda3/envs/spotdl/lib/python3.9/site-packages/spotdl/download/downloader.py", line 351, in _download_asynchronously
    self.loop.run_until_complete(asyncio.gather(*tasks))
  File "/home/xxx/anaconda3/envs/spotdl/lib/python3.9/asyncio/base_events.py", line 642, in run_until_complete
    return future.result()
  File "/home/xxx/anaconda3/envs/spotdl/lib/python3.9/site-packages/spotdl/download/downloader.py", line 346, in _pool_download
    return await self.download_song(song_obj)
  File "/home/xxx/anaconda3/envs/spotdl/lib/python3.9/site-packages/spotdl/download/downloader.py", line 167, in download_song
    youtubeHandler = YouTube(
  File "/home/xxx/anaconda3/envs/spotdl/lib/python3.9/site-packages/pytube/__main__.py", line 105, in __init__
    self.descramble()
  File "/home/xxx/anaconda3/envs/spotdl/lib/python3.9/site-packages/pytube/__main__.py", line 177, in descramble
    apply_signature(self.player_config_args, fmt, self.js)
  File "/home/xxx/anaconda3/envs/spotdl/lib/python3.9/site-packages/pytube/extract.py", line 370, in apply_signature
    cipher = Cipher(js=js)
  File "/home/xxx/anaconda3/envs/spotdl/lib/python3.9/site-packages/pytube/cipher.py", line 36, in __init__
    var, _ = self.transform_plan[0].split(".")
ValueError: not enough values to unpack (expected 2, got 1)
Exception ignored in: <function tqdm.__del__ at 0x7f6c87f0ed30>
Traceback (most recent call last):
  File "/home/xxx/anaconda3/envs/spotdl/lib/python3.9/site-packages/tqdm/std.py", line 1138, in __del__
  File "/home/xxx/anaconda3/envs/spotdl/lib/python3.9/site-packages/tqdm/std.py", line 1285, in close
  File "/home/xxx/anaconda3/envs/spotdl/lib/python3.9/site-packages/tqdm/std.py", line 1478, in display
  File "/home/xxx/anaconda3/envs/spotdl/lib/python3.9/site-packages/tqdm/std.py", line 1141, in __str__
  File "/home/xxx/anaconda3/envs/spotdl/lib/python3.9/site-packages/spotdl/download/progressHandlers.py", line 22, in format_dict
  File "/home/xxx/anaconda3/envs/spotdl/lib/python3.9/site-packages/tqdm/std.py", line 1436, in format_dict
TypeError: cannot unpack non-iterable NoneType object

System information Please provide the following information:

• Python version (run python --version)
  • 3.9.1
• Pytube version (run print(pytube.__version__) in python)
  • 10.5.0
• Command used to install pytube
  • python -m pip install git+https://github.com/nficano/pytube

[lost-RD]

Thanks!

[lost-RD]

Thanks again, works perfectly