Python 类的构造,继承,多重继承

#类的默认构造与结构
class people:
    __id = 1   #私有成员,无法在类外访问,在变量前面加两个下划线__表示私有变量 在类外访问非法
    m_age   = 2   #公有成员,可以在类外访问
    m_name =''
    def __init__(self,id,age,name):            #__init__为类的默认构造函数,在类初始化时候,自动执行该参数
            self.__id    =  id                 #self相当于C++中的this指针,相当于指向该类的指针使用"self."代表类成员
            self.m_age  = age
            self.m_name =name
    def Get__id(self):   #获取私有成员
        return self.__id

    def speak(self):
        print("%s说: 我的id为 %d,今年 %d 岁" % (self.m_name,self.__id, self.m_age))


p = people(id =1,age =18,name ='小刚')   #实例化类,
p.speak()


#类的继承
class DoSomething(people):
     m_dosomething =''
     def __init__(self,id,age,name,dosomething):
        people.__init__(self,id,age,name)   #调用父类的构造函数
        self.m_dosomething =dosomething     #子类变量赋值

     def speak(self):  #重写父类的函数
         print("%s说: 我的id为 %d,今年 %d 岁,我会%s" % (self.m_name, self.Get__id(), self.m_age,self.m_dosomething))




temp = DoSomething(id =1,age = 18,name ='小刚',dosomething= '画画')
temp.speak()
super(DoSomething,temp).speak()     #super函数,用与使用子类调用父类被重写的函数



class  aa:
    def __init__(self):
        self.a =1      #变量可以直接在构造中定义,并在类外使用
        self.b =2

ppp= aa()
print(ppp.a, ppp.b)


# people被Dosomething 继承  Dosomething被lovesomething继承,因为people被Dosomething继承了,所以people也会自动继承于lovesomething
class lovesomething(DoSomething):
     m_love =''
     def __init__(self,id,name,age,dosomething,love):
       # people.__init__(self,id,age,name)    #这里踩坑,只需要包含Dosomething的构造即可
        DoSomething.__init__(self,id,age,name,dosomething)
        self.m_love =love
     def speak(self):
         print("%s说: 我的id为 %d,今年 %d 岁,我会%s,我喜欢%s。" % (self.m_name, self.Get__id(), self.m_age, self.m_dosomething,self.m_love))


temp2= lovesomething(id =1,age = 18,name ='小刚',dosomething= '画画',love= '打篮球')
temp2.speak()



#多重继承
class A:
    def __init__(self, high):
        self.m_high =high
    def speak(self):
        print(' 高:%d',self.high)

class B:
    def __init__(self,width):
        self.m_width=width

    def speak(self):
        print(' 宽:%d ',self.width)


class C(A,B):   #继承A和B
    def __init__(self,width,high):
        A.__init__(self,high)
        B.__init__(self,width)

    def speak(self):  #重写A和B类的函数
        print('求乘积 %d x %d = %d' %(self.m_width,self.m_high,self.m_width * self.m_high))


temp3= C(2,3)
temp3.speak() 

 

posted @ 2021-06-02 00:35  神迹丶  阅读(212)  评论(0编辑  收藏  举报
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