Создайте класс Melody, который будет моделировать процесс подбора мелодии

N = 7
PITCHES = ["до", "ре", "ми", "фа", "соль", "ля", "си"]
LONG_PITCHES = ["до-о", "ре-э", "ми-и", "фа-а", "со-оль", "ля-а", "си-и"]
INTERVALS = ["прима", "секунда", "терция", "кварта", "квинта", "секста", "септима"]
 
 
class Note:
    def __init__(self, pitch, is_long=False):
        self.pitch = PITCHES.index(pitch)
        self.is_long = is_long
 
    def __str__(self):
        return LONG_PITCHES[self.pitch] if self.is_long else PITCHES[self.pitch]
 
    def __le__(self, other):
        return self.pitch <= other.pitch
 
    def __eq__(self, other):
        return self.pitch == other.pitch
 
    def __lt__(self, other):
        return self.pitch < other.pitch
 
    def __gt__(self, other):
        return self.pitch > other.pitch
 
    def __ge__(self, other):
        return self.pitch >= other.pitch
 
    def __rshift__(self, other):
        return Note(PITCHES[(self.pitch + other) % N], self.is_long)
 
    def __lshift__(self, other):
        return Note(PITCHES[(self.pitch - other) % N], self.is_long)
 
    def get_interval(self, other):
        return INTERVALS[abs(self.pitch - other.pitch)]
# тут, вроде, всё правильно
 
class Melody: 
    def __init__(self, notes=None):
        self.notes = notes.copy() if notes else []
 
    def __str__(self):
        return ', '.join([str(i) for i in self.notes])
 
    def append(self, item):
        self.notes.append(item)
 
    def replace_last(self, item):
        self.notes[-1] = item
 
    def remove_last(self):
        return self.notes.pop()
 
    def clear(self):
        return self.notes.clear()
 
    def __len__(self):
        return len(self.notes)
 
    def __rshift__(self, other):
        return Melody([n >> other for n in self.notes]) \
            if self.notes and max([n.pitch for n in self.notes]) + other < N else Melody(self.notes)
 
    def __lshift__(self, other):
        return Melody([n << other for n in self.notes]) \
            if self.notes and min([n.pitch for n in self.notes]) - other >= 0 else Melody(self.notes

return ', '.join([str(i) for i in self.notes])

return ', '.join([str(i) for i in self.notes]).title()