CODE EXAMPLE FOR PYTHON

python download youtube video

from pytube import YouTube
YouTube('https://youtu.be/9bZkp7q19f0').streams.first().download()
yt = YouTube('http://youtube.com/watch?v=9bZkp7q19f0')
(
  yt.streams
  .filter(progressive=True, file_extension='mp4')
  .order_by('resolution')
  .desc()
  .first()
  .download()
)