Python Day 21 面向对象 (面向对象的三大特性（二）继承，多态，封装，几个装饰器函数)

Python Day 21 面向对象 (面向对象的三大特性（二）继承，多态，封装，几个装饰器函数)

https://mubu.com/doc/1AqL_M0IbW

继承之钻石继承

多态

封装

几个装饰器函数

@classmethod  可以通过类使用被装饰的方法
@staticmethod 可以使用类.方法调用,而且不需要将self作为参数传进去

class MyFlies:

    __file_name="log"

    # @classmethod
    def open_file(cls,filename):
        print(cls.__file_name)
        with open(filename,"rb") as f:
            return f.read()

    @staticmethod
    def look_file(filename):
        print("根本不知道__file_name的存在")
        with open(filename,"rb") as f:
            return f.read()

    def self_open_file(self,filename):
        print(self.__file_name)
        with open(filename, "rb") as f:
            return f.read()


new_file = MyFlies()
print(new_file.open_file('log'))
print(MyFlies.open_file('log'))
# print(new_file.look_file("mylog.log"))
# print(new_file.open_file("mylog.log"))
# print(new_file.self_open_file("mylog.log"))
# print(MyFlies.open_file("mylog.log"))
# print(MyFlies.look_file("mylog.log"))