Python学习笔记-----类和对象知识点2)---类的继承

类的继承

 1.单继承

子类调用父类的一个方法，可以用super（） 或super(PersonB,self).__init__(name, age)

也可以使用PersonA.__init__(self, name, age)来确保父类被正确的初始化

 

class PersonA:
 
    def __init__(self,name, age):
        self.name = name
        self.age = age
        print('init action in father class PersonA')
 
    def print_a(self):
          print("Name : ", self.name,  ", Age: ", self.age) 
        

class PersonB(PersonA):
 
    def __init__(self, name, age,genger):
        super().__init__(name, age)  
        #super(PersonB,self).__init__(name, age)  
        #PersonA.__init__(self, name, age)  
        #self.name = name
        #self.age = age
        self.genger=genger
        print('init action in father class PersonB')
     
    def print_x(self):
        print("Name : ", self.name,  ", Age: ", self.age,  ", genger: ", self.genger)      


a=PersonA('AAA',23)
a.print_a()
b=PersonB('BBB',24,'male')
b.print_x()

 

 

 

2.多继承

 

class A(object):
    def __init__(self):
        print("Enter A")

class B(A):
    def __init__(self):
        print('Enter B(A)')
        super(B,self).__init__()
        print('Leave B(A)')

class C(A):
    def __init__(self):
        print('Enter C(A)')
        super(C, self).__init__()
        print('Leave C(A)')

class D(B,C):
    def __init__(self):
        print('Enter D(B,C)')
        super(D,self).__init__()
        print("Leave D(B,C)")


d=D()