Python @函数装饰器

def get_time(fn):
    def inner():
        begin = time.time()
        fn()
        end = time.time()
        print(f'这个函数的执行时间：{end - begin}')
    return inner


@get_time
def demo():
    for i in range(100000):
        print(i)

#@get_time注解 等价于 get_time(demo)
demo()

参考文章:http://c.biancheng.net/view/2270.html