【Python】Learn Python the hard way, ex42 对、类及从属关系

Hank_Gao

于 2015-10-17 21:58:15 发布

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本文通过具体的动物类比，展示了面向对象编程的基本概念，包括继承（is-a）和组合（has-a）。通过定义一系列类如Animal、Dog、Cat等，演示了如何在Python中实现这些概念。

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

# is-a
class Dog(Animal):
    def __init__(self, name):
        ## has-a
        self.name = name

# is-a
class Cat(Animal):
    
    def __init__(sefl, name):
        # has-a
        self.name = name
        
# is-a
class Person(object):
    
    def __init__(self, name):
        # has-a
        self.name = name
        
        ## Person has-a a pet of some kind
        self.pet = None
        
# is-a
class Emplyee(Person):
    
    def __init__(sefl, name, salary):
        ## ? hmm what is this strange magic?
        super(Emplyee, slef).__init__(name)
        ## has-a
        self.salary = salary
        
# is-a
class Fish(object):
    pass

# is-a
class Salmon(Fish):
    pass
    
# is-a
class Halibut(Fish):
    pass
    
# rover is-a Dog
rover = Dog("Rover")

# has-a
satan = Cat("Satan")

# has-a
mary = Person("Mary")

# has-a
mary.pet = satan

# has-a
frank = Employee("Frank", 120000)

# has-a
frank.pet = rover

# is-a
flipper = Fish()

# is-a
crouse = Salmon()

# is-a
harry = Halibut()