Question

class Book():
    def __init__(self, listOfBooks):
        self.availableBooks = listOfBooks       

    def displayAvailableBook(self):
        print()
        self.displayAvailableBook()


class TextBooks(Book):

    def __init__(self,listOfBooks):
        super().__init__(listOfBooks)

    def displayAvailableBook(self):
        print()
        print("Available Text Books: ")
        print("--------------------")
        for book in self.availableBooks:
            print(book)
        print()


class ReferenceBooks(Book):

    def __init__(self,listOfBooks):
        super().__init__(listOfBooks)

    def displayAvailableBook(self):
        print()
        print("Available Reference Books: ")
        print("-------------------------")
        for book in self.availableBooks:
            print(book)
        print()

def main():
    book = Book()
    t_books = TextBooks(['Rescued by Python','Introduction to AI', 'Machine Learning using Python'])
    r_books = ReferenceBooks(['Dictionary','Bible','Encyclopidia'])

    while True:
        print("Enter 1 to display the available text books")
        print("Enter 2 to display the available reference books")
        print("Enter 3 to request for a book")
        print("Enter 4 to return a book")
        print("Enter 5 to exit")
        userChoice = int(input())

        if userChoice is 1:
            book.displayAvailableBook()
        elif userChoice is 2:
            r_books.displayAvailableBook()
        elif userChoice is 3:
            requestedBook = customer.requestBook()
            t_books.lendBook(requestedBook)
        elif userChoice is 4:
            returnedBook = customer.returnBook()
            t_books.addBook(returnedBook)
        elif userChoice is 5:
            quit()

main()

Answer 1

您不会将参数传递给您的班级Book（）：

def main():
   book = Book()

这是一个问题，因为 init 必须由代码中名为listOfBooks的一个参数提供。因此，要解决您的问题，请为Book构造函数提供名称：

def main():
    bookList = ['a','b','c']
    book = Book(bookList)

Answer 2

该代码中存在一些问题： 1.）如果不提供书籍列表，则无法初始化类对象书。 2.）您永远不会初始化对象客户 3.）未定义类函数requestBook（），lendBook（）和addBook（）。

这是一个修改版本，我认为你做了你想要的但是我无法解决问题2.）和3.）因为我不知道你打算在那里做什么

class Book():
    def __init__(self, listOfBooks):
        self.availableBooks = listOfBooks

    def displayAvailableBook(self):
        print()
        self.displayAvailableBook()


class TextBooks(Book):

    def __init__(self,listOfBooks):
        super().__init__(listOfBooks)

    def displayAvailableBook(self):
        print()
        print("Available Text Books: ")
        print("--------------------")
        for book in self.availableBooks:
            print(book)
        print()


class ReferenceBooks(Book):
    def __init__(self,listOfBooks):
        super().__init__(listOfBooks)

    def displayAvailableBook(self):
        print()
        print("Available Reference Books: ")
        print("-------------------------")
        for book in self.availableBooks:
            print(book)
        print()

def main():
    #book = Book() This does not work since no list provided
    t_books = TextBooks(['Rescued by Python','Introduction to AI', 'Machine Learning using Python'])
    r_books = ReferenceBooks(['Dictionary','Bible','Encyclopidia'])

    while True:
        print("Enter 1 to display the available text books")
        print("Enter 2 to display the available reference books")
        print("Enter 3 to request for a book")
        print("Enter 4 to return a book")
        print("Enter 5 to exit")
        userChoice = int(input())

        if userChoice is 1:
            t_books.displayAvailableBook()
            r_books.displayAvailableBook()
        elif userChoice is 2:
            r_books.displayAvailableBook()
        elif userChoice is 3:
            requestedBook = customer.requestBook()
            t_books.lendBook(requestedBook)
        elif userChoice is 4:
            returnedBook = customer.returnBook()
            t_books.addBook(returnedBook)
        elif userChoice is 5:
            quit()

main()

Answer 3

你得到的错误很可能是来自第38行的TypeError。从我所看到的，这是因为你遗漏了创建图书对象的参数（book = Book() ）。

在您的课程定义中，您已经完成了这项工作，因此您需要传递一系列书籍，这些书籍尚未包含在对象的创建中。

这段代码给我错误我不知道我哪里错了？

3 个答案: