图书馆里有很多的书， 请定义一个名为Book的类。该类的属性包括书名（字符串），书号（字符串），单价（浮点数）；该类的构造函数接受书名，书号及单价三个参数并参成对象初始化；该类的__del__()函数则向终端打印如下信息： Book destroyed-书名,书号,单价 注意：单价保留两位小数。 【样例输入】 Python Programming 888-999 43.678 【样例输出】 Book destroyed-Python Programming,888-999,43.68 class Book: sName = input() #Input Book Name sNo = input() #Input Book Number fPrice = float(input()) #Input Book Price b = Book(sName,sNo,fPrice) b = None #__del__ method of object b been triggered

代码如下：

class Book:
    def __init__(self, name, number, price):
        self.name = name
        self.number = number
        self.price = round(price, 2)

    def __del__(self):
        print("Book destroyed-{}, {}, {:.2f}".format(self.name, self.number, self.price))

sName = input("Input Book Name: ")
sNo = input("Input Book Number: ")
fPrice = float(input("Input Book Price: "))
b = Book(sName, sNo, fPrice)
b = None

输入样例：

Input Book Name: Python Programming
Input Book Number: 888-999
Input Book Price: 43.678

输出样例：

Book destroyed-Python Programming, 888-999, 43.68