class book:
    id = 0;
    name = ''
    position = ''
    def __init__(self, id, name, position):
        self.id = id
        self.name = name
        self.position = position
    def speak(self):
        print("%d号图书是《%s》，在%s。"%(self.id, self.name, self.position))
b1 = book(1, 'a', 'a001')
b1.speak()