def pprint(self):
frames = sorted(Frame.pprint(s) for s in self.values())<EOL>return '<STR_LIT:\n>'.join(frames)<EOL>
Return 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``