Download whole playlist of videos from youtube with Python

youtube.py

#############################
#
# Needed it to download this guy: https://www.youtube.com/playlist?list=PLPemlF-zX2ydW5QoNsHpQiLCQKIKdjvoo
# 
# Figured why not stick it up on github too.
#
#############################

import pafy
import os

playlist_url = raw_input("What's the URL of the playlist? ")
playlist = pafy.get_playlist(playlist_url)
videos = playlist['items']
directory = "./" + playlist['title']

if not os.path.exists(directory):
    os.makedirs(directory)

for video in videos:
  p = video['pafy']
  print p.title
  best = p.getbest(preftype="mp4")
  filepath = directory + "/" + best.title + "." + best.extension
  best.download(filepath=filepath)

print "Done."