In response to the question here: http://www.reddit.com/r/learnprogramming/comments/2u7xon/the_command_line_doesnt_have_to_be_scary_heres_a/co6h6xl

ugly_youtube_playlist_downloader.py

import pafy

playlist_url = raw_input("Please enter a proper Youtube playlist URL: ") #must be properly formatted like https://www.youtube.com/playlist?list=PL557BC4AF6ABFF637

playlist = pafy.get_playlist(playlist_url)

how_many_vids_in_this_playlist = len(playlist['items']) #long variables are fun
print "Thanks for the URL, I'm now going to download", how_many_vids_in_this_playlist, "videos"

for videos in playlist['items']:
    target = videos['pafy'].getbestaudio()
    print "Currently downloading", videos['playlist_meta']['title'] #might as well see the name of each track as it downloads
    # it would be nice to have a progress indicator, like x of total finished downloading
    #I'll leave that part up to you :)
    target.download()