yewtube is based on mps-youtube and mps-youtube is based on mps, a terminal based program to search, stream and download music. For Windows / Linux / Mac OS X. This implementation uses YouTube as a source of content and can play and download video as well as audio. The pafy library handles interfacing with YouTube. What's new in yewtube?

No Youtube API Key required Run audio in VLC with no GUI

These features are still inherited from mps-youtube:

Search and play audio/video from YouTube Search tracks of albums by album title Search and import YouTube playlists Create and save local playlists Download audio/video Convert to mp3 & other formats (requires FFmpeg or avconv) View video comments Works with Python 3.x Requires MPlayer, MPV or VLC Media Player