Answer 1

According to this thread https://stackoverflow.com/a/27481870/8382789 , that code might work:

from __future__ import unicode_literals
import youtube_dl
ydl_opts = {
'format': 'bestaudio/best',
'postprocessors': [{ 'key': 'FFmpegExtractAudio', 'preferredcodec': 'mp3', 'preferredquality': '192', }],
}
with youtube_dl.YoutubeDL(ydl_opts) as ydl:
ydl.download(['http://www.youtube.com/watch?v=BaW_jenozKc'])

Best of luck! :)