Download YouTube playlist videos as MP3 files

download.py

import pytube, sys, os

if __name__ == "__main__":
    playlistURL = sys.argv[1]
    playlist = pytube.Playlist(playlistURL)

    for video in playlist.videos:
        video.streams.get_audio_only().\
            download(output_path="./out", filename=video._title)
        
        filename = "./out/" + video._title + ".mp4"
        os.rename(filename, filename[:-4] + ".mp3")