当我运行我的代码时，我得到： AttributeError: 'CD' object has no attribute '_CD__id'

Question

这是我的代码：

class Product:
    
    def __init__(self,id, title, price):
        self.__id = id
        self. __title = title
        self. __price = price
    def get_id_title_price(self):
        return "ID: "+str(self.__id)+" Title:"+self.__title+ "Price: "+str(self.__price)

#write your code here
class Book(Product):
    def __init__(self,id, title, price, isbn, publisher):
        super().__init__(id, title, price)
        self.isbn = isbn
        self.publisher = publisher
    def printDetail(self):
        return f"{super().get_id_title_price()}\nISBN: {self.isbn} Publisher: {self.publisher}"

class CD(Product):
    def __init__(self, id, title, price, band, duration, genre):
        super().__init__(id, title, price)
        self.band = band
        self.genre = genre
        self.duration = duration
    def printDetail(self):
        return "ID: "+str(self.__id)+" Title:"+self.__title+ " Shotto Price: "+str(self.__price) + "Band: "+ self.band + "Duration: "+str(self.duration)+ "Genre: "+ self.genre

book = Book(1,"The Alchemist",500,"97806","HarperCollins")
print(book.printDetail())
print("-----------------------")
cd = CD(2,"Shotto",300,"Warfaze",50,"Hard Rock")
print(cd.printDetail()) 

当我运行它时出现此错误：

AttributeError: 'CD' 对象没有属性 '_CD__id'

但是我找不到哪里出错了