__init__() 需要 3 个位置 arguments 但运行时给出 4 个

Question

你好

我有这个代码 python 代码，试图制作一个父 class 出版物和 2 个子类（书籍和杂志）。

然后它尝试创建一个 object 并根据列表中的用户选择将其添加到列表中

class Publication:
    title=""
    price=0.0

    def __init__(self,title,price):
        self.title=title
        self.price=price

    def display(self):
        print("title: "+self.title)
        print("\nprice: "+str(self.price))



class Book(Publication):
    author=""

    def __init__(self,title,price,author):
        super().__init__(self,title,price)
        self.author=author

    def display(self):
        print("title: "+self.title)
        print(", price: "+ str(self.price))
        print(", author: "+self.author)


class Magazine(Publication):
    issue = ""

    def __init__(self, title, price, issue):
        super().__init__(self, title, price)
        self.issue = issue

    def display(self):
        print("title: " + self.title)
        print(", price: " + str(self.price))
        print(", issue: " + self.issue)



# Press the green button in the gutter to run the script.
if __name__ == '__main__':

    choice=1;
    bookList=[]
    MagazineList=[]

    while(choice!=0):
        print("Publication System")
        print("Select a service:")
        print("1) Add Book")
        print("2) Add Magazine")
        print("3) Display Book Lists")
        print("4) Display Magazine Lists")
        print("5) Exit")
        choice = int(input("Enter choice: "))

        if choice == 1:
            bookTitle=str(input("Enter the book title: "))
            bookAuthor = str(input("Enter the book author: "))
            bookPrice = float(input("Enter the book price: "))

            book=Book(bookTitle,bookPrice,bookAuthor)
            bookList.append(book)

        elif choice == 2:
            MagazineTitle=str(input("Enter the magazine title: "))
            MagazineIssue = str(input("Enter the magazine issue: "))
            MagazinePrice = float(input("Enter the magazine price: "))

            magazine=Magazine(MagazineTitle,MagazinePrice,MagazineIssue)
            MagazineList.append(magazine)

        elif choice == 3:
            for i in range(len(bookList)):
                print(bookList[i]+"\n")

        elif choice == 4:
            for i in range(len(MagazineList)):
                print(MagazineList[i]+"\n")

        elif choice == 5:
            print("Exiting!")
        else:
            print("Invalid choice!!")

当我运行它时，它向我显示了这个错误：

Publication System
Select a service:
1) Add Book
2) Add Magazine
3) Display Book Lists
4) Display Magazine Lists
5) Exit
Enter choice: 1
Enter the book title: python fundamentals
Enter the book author: eric
Enter the book price: 40
Traceback (most recent call last):
  File "/Users/zahraaal-nemer/Desktop/University/Level 10/Advanced Programming Language/Lab/Q1OtherGroups/main.py", line 64, in <module>
    book=Book(bookTitle,bookPrice,bookAuthor)
  File "/Users/zahraaal-nemer/Desktop/University/Level 10/Advanced Programming Language/Lab/Q1OtherGroups/main.py", line 19, in __init__
    super().__init__(self,title,price)
TypeError: __init__() takes 3 positional arguments but 4 were given

我该如何解决？ 我见过类似的问题，但没有找到答案

Answer 1

super().__init__是一个绑定方法，已经包含self 。 你不需要明确地传递self 。 例如，

class Book(Publication):    
    def __init__(self, title, price, author):
        super().__init__(title, price)
        self.author = author

    # etc

Answer 2

在调用 class 方法时，您不需要显式传递self 。

它应该是

super().__init__(title, price)

代替

super().__init__(self, title, price)