code: def note(self):
          
          offset = self.midi - 60  # self.midi - A4_midi + Tone.tones.index('A')
          index = offset % 12      # offset % len(Tone.tones)
          octave = 4 + offset // 12
          if 0 <= octave <= 9:
              return (
                  Tone.tones[index] +
                  ('#' if Tone.tones[index] == Tone.tones[index - 1] else '') +
                  str(octave)
              )
          raise ValueError('%f is outside the notation range' % self.frequency)
docs: Return the (nearest) note to the tone's frequency. This will be a
          string in the form accepted by :meth:`from_note`. If the frequency is
          outside the range represented by this format ("A0" is approximately
          27.5Hz, and "G9" is approximately 12.5Khz) a :exc:`ValueError`
          exception will be raised.