#!/usr/bin/python

 #coding:utf-8

 # animal is-a object(yes,sort of sonfusing)look at the extra credit

 class Animal(objeck):

     pass

 #Dog 类 继承 Animal

 class Dog(Animal):

     def __init__(self,name):

         #对 对象Dog赋值 name

         self.name =name

 #Cat 类 继承 Animal

 class Cat(Animal):

     def  __init__(self,name):

         #对 对象 Cat 赋值 name

         self.name=name

 #建立类 Person

 class Person(objeck):

     def __init__(self,name):

         ##对 对象 Person 赋值 name

         self.name = name

         #Person has-a pet of some kind

         self.pet = none

 #类 Employee 继承 Person

 class Employee(Person):

     def __init__(self,name,salary)

     #? what is this strange magic?

     #使用超级继承 super ,对 Employee 增加初始化 init

     super(Employee,self).__init__(name)

     # 赋值 salary

     self.salary= salary

 #建 类 Fish

 class Fish(objeck):

     pass

 #Salmon 类 继承 Fish

 class Salmon(Fish):

     pass

 #Halibut 类 继承 Fish

 class Halibut(Fish):

     pass

 #rover is-a Dog

 rover = Dog('rover')

 #satan is-a Cat

 satan = Cat('satan')

 #mary is-a Person

 mary = Person('mary')

 #mary has-a pet,pet(name) is satan

 mary.pet = satan

 #frank is-a Employee frank.salary = 12000

 frank = Employee('frank',12000)

 #fank has-a pet,pet(name) = rover

 frank.pet rover

 #flipper is-a Fish

 flipper =Fish()

 #crouse is-a Salmon

 crouse =Salmon()

 #harry is-a Halbut

 harry = Halibut()