与孩子一起学编程14章

这一章，开始学习对象

什么是对象，如何创建和使用对象。对象包括两个方面：属性和方法。

如果要建立一个球，球就是一个对象，他要有属性和方法。

class HotDog:    def __init__(self):        self.cooked_level = 0        self.cooked_string = "Raw"        self.condiments = []    def __str__(self):        msg = "hot dog"        if len(self.condiments) > 0:            msg = msg + " with"        for i in self.condiments:            msg = msg + i + ", "        msg = msg.strip(", ")        msg = self.cooked_string + " " + msg + "."        return msg    def cook(self, time):        self.cooked_level = self.cooked_level + time        if self.cooked_level > 8:            self.cooked_string = "Charcoal"        elif self.cooked_level > 5:            self.cooked_string = "Well-done"        elif self.cooked_level > 3:            self.cooked_string = "Medium"        else:            self.cooked_string = "Raw"    def addCondiment(self, condiment):        self.condiments.append(condiment)        myDog = HotDog()print myDogprint "Cooking hot dog for 4 minutes..."myDog.cook(4)print myDogprint "Cooking hot dog for 3 more minutes..."myDog.cook(3)print myDogprint "What happens if I cook it for 10 more minutes?"myDog.cook(10)print myDogprint "Now, I'm going to add some stuff on my hot dog"myDog.addCondiment("ketchup")myDog.addCondiment("mustard")print myDog