Python手记（三）：类的继承

今天药忘吃喽~ 2022-06-07 12:58 218阅读 0赞

## Python手记（三）：类的继承 ##

#Author :ywq
    class human:
        def __init__(self,name,age):
            self.name=name
            self.age=age
        def think(self):
            print('Human %s is thinking about something ' %self.name)
        def talk(self):
            print('Human %s is talking with others' % self.name)
    
    class animals:
        def eat(self):
            print('animal %s need to eat for survival' % self.name)
    
    
    class man(human,animals):
        def __init__(self,name,age,money):
            self.name=name
            self.age=age
            self.money=money
        def fighting(self):
            print('Man should fighting for a family')
    
    class woman(human,animals):
        def born(self):
            print('woman can reproduction')
        def talk(self,obj):
            super(woman,self).talk()
            print('woman %s is talking with %s' % (self.name,obj.name))
    
    
    a=man("Alex",22,100)
    a.fighting()
    a.think()
    a.talk()
    a.eat()
    
    b=woman('Alice',20)
    b.born()
    b.eat()
    b.talk(a)
    
    
    #######
    >>>Man should fighting for a family
    >>>Human Alex is thinking about something 
    >>>Human Alex is talking with others
    >>>animal Alex need to eat for survival
    >>>woman can reproduction
    >>>animal Alice need to eat for survival
    >>>Human Alice is talking with others
    >>>woman Alice is talking with Alex

## **结论：** ##

1.在父类（human）和子类（man）都定义了构造函数时（其他函数类同），以子类本身优先级最高，所以需要按照子类中构造函数的的标准提供3个变量（name.age,money）;

2.若子类的函数与父类同名，则优先只运行子类，若希望与父类一起运行，则可在子类函数内使用super(SUBCLASS\_NAME,self),FUNC\_NAME()方式调用父类函数，两者一起运行；

3.如果子类没有定义构造函数，可以直接继承调用父类的构造函数，方法等；

4.如果继承的父类有多个时，按从左至右的顺序装配，优先级左边最高；

5.基类必须要有构造函数才能运行，且类的实例的变量数要与构造函数参数一一对应；

6.子类可以是从某个父类中继承一个构造函数，这个继承的父类一定要写在第一位，后面的继承的父类可以无需拥有构造函数