code: def pprint(self):
          
  
          frames = sorted(Frame.pprint(s) for s in self.values())
          return "\n".join(frames)
docs: Returns:
              text: tags in a human-readable format.
  
          "Human-readable" is used loosely here. The format is intended
          to mirror that used for Vorbis or APEv2 output, e.g.
  
              ``TIT2=My Title``
  
          However, ID3 frames can have multiple keys:
  
              ``POPM=user@example.org=3 128/255``