13.5 多态的实现

 

class Student:
    def __init__(self,name,age):
        self.name=name
        self.age=age
    def __str__(self):         #object中有__str__()方法，用于对于 ‘对象的描述’
        return '我的名字是{0},今年{1}岁'.format(self.name,self.age)

stu=Student('张三',20)
print(dir(stu))               #查看指定对象所有属性
print(stu)                    #默会调用__str__()这样的方法
print(type(stu))

E:\PycharmProjects\pythonProject\venv\Scripts\python.exe E:/PycharmProjects/pythonProject/demon1/demo46.py
['__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__', 'age', 'name']
我的名字是张三,今年20岁
<class '__main__.Student'>

进程已结束,退出代码0