Pafy (Python API for YouTube content)

Python API for YouTube - Download videos and retrieve metadata from
YouTube.

- Retreive metadata such as viewcount, duration, rating, author,
  thumbnail, keywords.
- Download video or audio at requested resolution / bitrate / format /
  filesize.
- Command line tool (ytdl) for downloading directly from the command
  line.
- Retrieve the URL to stream the video in a player such as vlc or
  mplayer.
- Works with age-restricted videos and non-embeddable videos.
- Small, standalone, single importable module file (pafy.py).
- Select highest quality stream for download or streaming.
- Download audio only (no video) in ogg or m4a format.
- Download video only (no audio) in m4v format.
- Retreive playlists and playlist metadata.
- Works with Python 2.6+ and 3.3+.