#定义一个烤地瓜的类，烤地瓜时间可叠加，作料可叠加 class kaodigua:     #初始化烤地瓜的一些属性     def __init__(self):         self.cookedString = "生的"         self.cookedLevel = 0         self.zuoliao =[] #储存地瓜的作料添加类别     #实例化返回参数     def __str__(self):         return "现在地瓜状态是%s，加的作料有%s"%(self.cookedString,self.zuoliao)     #定义烤地瓜的方法     def cook(self,cookedTime):         self.cookedLevel += cookedTime         if self.cookedLevel >=0 and self.cookedLevel < 3:             self.cookedString = "生的"         elif self.cookedLevel >= 3 and self.cookedLevel < 5:             self.cookedString = "本生不熟的"         elif self.cookedLevel >= 5 and self.cookedLevel < 8:             self.cookedString = "熟的"         elif self.cookedLevel >=8:             self.cookedString = "烤糊了"     #定义添加作料的方法     def jia_zuo_liao(self,zuoliao):         self.zuoliao.append(zuoliao) #创建一个烤地瓜对象 digua = kaodigua() digua.cook(1) digua.jia_zuo_liao("盐") print(digua) digua.cook(3) digua.jia_zuo_liao("芥末") print(digua) digua.cook(5) digua.jia_zuo_liao("白砂糖") print(digua)