python面向对象:多态

osc_8cqhsn24 2020-11-17 08:41:52
def


python面向对象:多态

多态的应用场景

1. 对象所属的类之间没有继承关系

调用同一个函数fly(), 传入不同的参数(对象),可以达成不同的功能

class Duck(object): # 鸭子类
def fly(self):
print("鸭子沿着地面飞起来了")
class Swan(object): # 天鹅类
def fly(self):
print("天鹅在空中翱翔")
class Plane(object): # 飞机类
def fly(self):
print("飞机隆隆地起飞了")
def fly(obj): # 实现飞的功能函数
 obj.fly()
duck = Duck()
fly(duck)
swan = Swan()
fly(swan)
plane = Plane()
fly(plane)
===运行结果:===================================================================================
鸭子沿着地面飞起来了
天鹅在空中翱翔
飞机隆隆地起飞了

2. 对象所属的类之间有继承关系(应用更广)

class gradapa(object):
def __init__(self,money):
self.money = money
def p(self):
print("this is gradapa")
class father(gradapa):
def __init__(self,money,job):
super().__init__(money)
self.job = job
def p(self):
print("this is father,我重写了父类的方法")
class mother(gradapa): 
def __init__(self, money, job):
super().__init__(money)
self.job = job
def p(self):
print("this is mother,我重写了父类的方法")
return 100
#定义一个函数,函数调用类中的p()方法
def fc(obj):
obj.p()
gradapa1 = gradapa(3000)
father1 = father(2000,"工人")
mother1 = mother(1000,"老师")
fc(gradapa1) #这里的多态性体现是向同一个函数,传递不同参数后,可以实现不同功能.
fc(father1)
print(fc(mother1))
===运行结果:===================================================================================
this is gradapa
this is father,我重写了父类的方法
this is mother,我重写了父类的方法
100

 

总结如下:

多态性依赖于:继承
综合来说:多态性:定义统一的接口,一种调用方式,不同的执行效果(多态性)
# obj这个参数没有类型限制,可以传入不同类型的值 ;参数obj就是多态性的体现
def func(obj):
obj.run() # 调用的逻辑都一样,执行的结果却不一样
class A (object):
def run(self):
pass
class A1 (A):
def run(self):
print ('开始执行A1的run方法')
class A2 (A):
def run(self):
print ('开始执行A2的run方法')
class A3 (A):
def run(self):
print ('开始执行A3的run方法')

obj1
= A1 () obj2 = A2 () obj3 = A3 () func(obj1) 输出:开始执行A1的run方法 func(obj2) 输出:开始执行A2的run方法 func(obj3) 输出:开始执行A3的run方法




 

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本文为[osc_8cqhsn24]所创,转载请带上原文链接,感谢
https://my.oschina.net/u/4329266/blog/4720624

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