code: def from_midi(cls, midi_note):
          
          midi = int(midi_note)
          if 0 <= midi_note < 128:
              A4_midi = 69
              A4_freq = 440
              return cls.from_frequency(A4_freq * 2 ** ((midi - A4_midi) / 12))
          raise ValueError('invalid MIDI note: %r' % midi)
docs: Construct a :class:`Tone` from a MIDI note, which must be an integer
          in the range 0 to 127. For reference, A4 (`concert A`_ typically used
          for tuning) is MIDI note #69.
  
          .. _concert A: https://en.wikipedia.org/wiki/Concert_pitch