
class Rectangle:
    def __init__(self, length, width):
        self.length = length
        self.width = width
    def area(self):
        areas = self.length * self.width
        return areas
    @property  	# 就像访问属性一样
    def area(self):
        return self.width * self.length
    @staticmethod  	# 静态方法  和class类断开联系
    def func():  	# self  在调用的时候会报错
        print(‘staticmethod func’)
    @classmethod  	# 类方法 
    def show(cls):  	# cls 代表类本身 
        print(cls)
        print('show fun')
类装饰器
class Test_Class:
    def __init__(self, func):
        self.func = func
    def __call__(self):
        print('类')
        return self.func
@Test_Class
def fun_test():
    print('这是个测试函数')
需要定义 __call__ 方法
