A script I cooked up that compiles all of your playlist's songs to a single playlist.
Simply change the CLIENT_ID and CLIENT_SECRET variables to the values corresponding with your Spotify bot client.
You can create a playlist based on other people's playlists by providing the link to their Spotify profile, like so: python spotistash.py <url>.
If you'd like, you may choose to increase MAX. The higher the MAX, the more playlists and songs the script will capture and add to the new playlist. However, it is very unlikely you have over 1000 playlists...
You may randomly get a Insufficient client scope error. This is fault of Spotify's API and not the program.