Learn Python the hard way, ex45 对象、类、以及从属关系

 #!/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()

没有写别的