py请定义一个TextBook类,从Book类继承,教材相比普通书籍需要配套课件和练习题, 所以请增加属性:courseware和exercise, 并重载info方法,增加courseware和exercise信息输出。请实例化一个python_textbook对象, 并调用info()方法，输出信息.

好的，以下是定义TextBook类的代码：

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

    def info(self):
        print(f"书名：{self.title}\n作者：{self.author}\n价格：{self.price}元")

class TextBook(Book):
    def __init__(self, title, author, price, courseware, exercise):
        super().__init__(title, author, price)
        self.courseware = courseware
        self.exercise = exercise

    def info(self):
        super().info()
        print(f"课件：{self.courseware}\n练习题：{self.exercise}")

python_textbook = TextBook("Python编程基础", "John Smith", 89.9, "Python编程基础课件", "Python编程基础练习题")
python_textbook.info()

输出结果为：

书名：Python编程基础
作者：John Smith
价格：89.9元
课件：Python编程基础课件
练习题：Python编程基础练习题