Python 如何在派生类中使用新信息覆盖基类方法？

我被问到以下问题：

给定基类书籍，定义一个名为Encyclopedia的派生类。在派生的百科全书类中，定义一个print_info（）方法，该方法通过不仅打印标题、作者、出版商和出版日期，而且打印版本和卷数来覆盖图书类的print_info（）方法

例如：

如果输入

Enter Book Information
Enter title: The Hobbit
Enter author: J. R. R. Tolkien
Enter publisher: George Allen & Unwin
Enter publication date: 21 September 1937
Enter title: The Illustrated Encyclopedia of the Universe

Enter Encyclopedia Information
Enter author: James W. Guthrie
Enter publisher: Watson-Guptill
Enter publication date: 2001
Enter edition: 2nd
Enter number of volumes: 1

输出

Book Information: 
   Book Title: The Hobbit
   Author: J. R. R. Tolkien
   Publisher: George Allen & Unwin
   Publication Date: 21 September 1937
Encyclopedia Information: 
   Book Title: The Illustrated Encyclopedia of the Universe
   Author: James W. Guthrie
   Publisher: Watson-Guptill
   Publication Date: 2001
   Edition: 2nd
   Number of Volumes: 1

我试过搞乱它，但我只是一直打印两次书的信息？ 这是我的密码

class Book:
    def __init__(self, title, author, publisher, publication_date):
        self.title = title
        self.author = author
        self.publisher = publisher
        self.publication_date = publication_date

    def print_info(self):
        print('Book Information:')
        print('   Book Title:', self.title)
        print('   Author:', self.author)
        print('   Publisher:', self.publisher)
        print('   Publication Date:', self.publication_date)


class Encyclopedia(Book):
    # TODO: Define constructor with attributes:
    #       title, author, publisher, publication_date, edition, num_volumes
    def __init__(self, title, author, publisher, publication_date, edition, num_volumes):
        Book.__init__(self, title, author, publisher, publication_date)
        self.edition = edition
        self.num_volumes = num_volumes

    # TODO: Define a print_info() method that overrides the print_info()
    #       in the Book class
    def print_info(self):
        print('Encyclopedia Information:')
        print('   Book Title:', self.title)
        print('   Author:', self.author)
        print('   Publisher:', self.publisher)
        print('   Publication Date:', self.publication_date)
        print('   Edition:', self.edition)
        print('   Number of Volumes:', self.num_volumes)

if __name__ == "__main__":
    print('Enter Book Information')
    title = input('Enter title: ')
    author = input('Enter author: ')
    publisher = input('Enter publisher: ')
    publication_date = input('Enter publication date: ')
    print('\nEnter Encyclopedia Information')
    e_title = input('Enter title: ')
    e_author = input('Enter author: ')
    e_publisher = input('Enter publisher: ')
    e_publication_date = input('Enter publication date: ')
    edition = input('Enter edition: ')
    num_volumes = int(input('Enter number of volumes: '))

    #TODO: Creat a book instance and call the print_info method    
    book = Book(title, author, publisher, publication_date)
    book.print_info()
    #TODO: Creat a encyclopedia instance and call the print_info method
    enc = Encyclopedia(title, author, publisher, publication_date, edition, num_volumes)
    enc.print_info()

---

创建

enc

对象时，传递的参数与

book

对象相同。它应该是

enc=Encyclopedia（e_title，e_author，e_publications，e_publication，e_date，edition，num_volumes）

。

只需将参数更改为：

---

因为您为这两个类发送相同的参数，所以它会将它们打印两次

它看起来像这样的原因是您没有使用属性定义所有属性。看起来您仍然缺少作者、出版商和发布日期。同时删除第20行。我想那应该是第20行，但这是你有书的地方。init（自我、标题、作者、出版商、出版日期）。删除整行代码，然后只定义author、publisher和publication\u date的属性值，就像对edition和num\u volume所做的那样，然后就可以了。其他一切看起来都很好

enc = Encyclopedia(e_title, e_author, e_publisher, e_publication_date, edition, num_volumes)
enc.print_info()