Python自学之乐-继承的新式类与经典类

#Author:clark
class Animal(object):#python3中新式类写法，继承object（所有类的基类）
    #kind = ""    #类属性
    def __init__(self,name,age,food):#name等是实例属性  init方法叫做构造方法__del__是析构方法
        self.Name = name
        self.Age = age
        self.food = food
    def eat(self):
        print("%s is eat %s" %(self.Name,self.food))
    def barking(self):
        print("%s is barking"%self.Name)

class dog(Animal):   #狗是动物的子类，如果增加新的属性并且要继承父类的属性，按照下面这样去写
    def __init__(self,name,age,food,kind):
        #Animal.__init__(self,name,age,food)   经典类的写法，这种写法比较繁琐，如果该类继承多个类的相同属性，就需要每个类都要写，新式类使用super写法，写一个就行
        super(dog,self).__init__(name,age,food)
        self.kind = kind
    def barking(self):
        print("the barking of %s is wangwangwang!"%self.Name)
class cat(Animal):
    def __init__(self,name,age,food,kind):
        #Animal.__init__(self,name,age,food)
        super(cat,self).__init__(name,age,food)
        self.kind = kind
    def barking(self):
        print("the barking of %s is miaomiaomiao"%self.Name)

dog_teddy = dog("ahuang",3,"bone","teddy")
dog_teddy.eat()
cat_xiaohua = cat("xiaohua",2,"fish","cat")
cat_xiaohua.eat()
dog_teddy.barking()
cat_xiaohua.barking()

运行结果为：

ahuang is eat bone
xiaohua is eat fish
the barking of ahuang is wangwangwang!
the barking of xiaohua is miaomiaomiao