def inversion(self, index=0, initial_octave=None):
        value = self.__note_octave(initial_octave) if initial_octave else self.value
        octv = initial_octave if initial_octave else self.octave
        note_value = value - (2 * index)
        return Note(note_value, octv, self.dur, self.volume)
dataset/ETHPy150Open kroger/pyknon/pyknon/music.py/Note.inversion/swapped operands of `-`