## Animal is-a object (yes, sort of confusing) look at the extra credit class Animal(object):pass ## ?? class Dog(Animal):def __init__(self, name): ## ??self.name = name ## ?? class Cat(Animal):def __init__(self, name): ## ??self.name = name ## ?? class Person(object):def __init__(self, name): ## ??self.name = name ## Person has-a pet of some kindself.pet = None ## ?? class Employee(Person):def __init__(self, name, salary): ## ?? hmm what is this strange magic?super(Employee, self).__init__(name) ## ??self.salary = salary ## ?? class Fish(object):pass ## ?? class Salmon(Fish):pass ## ?? class Halibut(Fish):pass ## rover is-a Dog rover = Dog("Rover") ## ?? satan = Cat("Satan") ## ?? mary = Person("Mary") ## ?? mary.pet = satan ## ?? frank = Employee("Frank", 120000) ## ?? frank.pet = rover ## ?? flipper = Fish() ## ?? crouse = Salmon() ## ?? harry = Halibut()

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轉載于:https://www.cnblogs.com/hluo/p/4054211.html

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