用描述符实现classmethod方法和staticmethod方法

1. @classmethod

class ClassMethod:
    def __init__(self, func):
        self.func = func

    def __get__(self, instance, owner):
        """
        类来调用,instance为None,owner为类本身。
        实例来调用,instance为实例,owner为类本身。
        :param instance:
        :param owner:
        :return:
        """

        def feedback(*args, **kwargs):
            return self.func(owner, *args, **kwargs)

        return feedback

class People:
    name = 'edward'

    @ClassMethod
    def say_hi(cls, msg):
        print(f'你好{cls.name},{msg}')

People.say_hi('你好帅')

2. @staticmethod

class StaticMethod:
    def __init__(self, func):
        self.func = func

    def __get__(self, instance, owner):
        def feedback(*args, **kwargs):
            return self.func(*args, **kwargs)

        return feedback

class People:
    name = 'edward'

    @StaticMethod
    def say_hi(x, y, z):  # say_hi = StaticMethod(say_hi)
        print('------>', x, y, z)

People.say_hi(1, 2, 3)