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