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ex42.py

# -*- coding:utf-8 -*-
## Animal is-a object (yes,sort of confusing) look at the extra credit
class Animal(object):
    pass

## 添加在动物的子类狗??
class Dog(Animal):
    def __init__ (self,name):
        self.name = name
        print(self.name)
## 添加在动物的子类猫??
class Cat(Animal):
    def __init__ (self,name):
        self.name = name
        print(self.name)
## 添加人类??
class Person(object):
    def __init__(self,name):
        self.name = name
    ## person has-a pet of some kind
        self.pet = None  #确保类中的self.pet属性设置为None
        print (self.name)
    
##添加劳动者??
class Employee(Person):
    def __init__(self, name, salary):
    ## ?? hmm what is this strange magic?
        Person.__init__(self, name)
    #super(Employee,self).__init__(name) 注意super函数的用法,和上一句代码作用相同
    ##??
        self.salary =salary
        print (self.salary)

class Fish(object):
    pass
    
##在鱼的大类中定义salmon这个小类 ??
class salmon(Fish):
    pass
    
## 在鱼的大类中定于比目鱼这个小类??
class Halibut(Fish):
    pass
    
## 狗类的一个特定对象rover,rover is-a Dog
rover = Dog ("ROVER")

## 猫类的一个特定对象satan??
satan = Cat("satan")

##人类的一个具体的对象mary??
mary = Person("Mary")

##mary的宠物satan???
mary.pet = satan

##劳动者的一个具体对象frank??
frank = Employee("Frank", 12000)

##frank的宠物???
frank.pet = rover

## flipper是鱼类的一个具体对象??
flipper = Fish()

## crourse 是salmon中的一个具体对象??
crouse = salmon()

##harry 是Halibut中的一个具体对象 ??
harry = Halibut()

    
    
    
    
    
    

 

ex42.py