装饰器

使用装饰器计算函数运行时间

https://www.zhihu.com/people/logan-93-60

import time 
from functools import wraps
def timer(fun):
    @wraps(fun)
    def timer(*args, **kwargs):
        start = time.time()
        fun(*args, **kwargs)
        end = time.time()
        print("run time", end-start)
    return timer
@timer    
def fun(*args, **kwargs):
    time.sleep(1.1)
fun()

使用 @property

https://www.liaoxuefeng.com/wiki/1016959663602400/1017502538658208