面向对象——继承

102.继承

#测试继承语法结构

class Person:
    def __init__(self,name,age):
        self.name = name
        self.__age = age  #私有属性

    def say_age(self):
        pass
        #print('年龄是{0}'.format(self.age))

class Student(Person):
    def __init__(self,name,age,score):
        Person.__init__(self,name,age)
        self.score = score

print(Student.mro())  #Student.mro()显示子类的继承结构
s = Student("马宝林",18,80)
s.say_age()
#print(s.age)  #父类里面是私有的，私有方法属性，子类继承了但是不能用
print(s._Person__age)
print(dir(s))
print(s.name)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23

D:\python\python37\python.exe F:/python/mypro01/mypro07.py
[<class '__main__.Student'>, <class '__main__.Person'>, <class 'object'>]
18
['_Person__age', '__class__', '__delattr__', '__dict__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__gt__', '__hash__', '__init__', '__init_subclass__', '__le__', '__lt__', '__module__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', '__weakref__', 'name', 'say_age', 'score']
马宝林
1
2
3
4
5

103.方法的重写

#测试继承方法的重写

class Person:
    def __init__(self,name,age):
        self.name = name
        self.__age = age  #私有属性

    def say_age(self):
        print('我的年龄是{0}'.format(self.__age))

    def say_introduction(self):
        print("我的名字是：{}".format(self.name))

class Student(Person):
    def __init__(self,name,age,score):
        Person.__init__(self,name,age)
        self.score = score

    def say_introduction(self):
        
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19