python零基础学习2-函数1-装饰器

calc=lambda x:x*3
print(calc(3))      #返回9

import time

def timmer(func):
    def wrapper(*args,**kwargs):
        start_time=time.time()
        func()
        stop_time=time.time()
        print("run time:",stop_time-start_time)
    return wrapper

@timmer
def test():
    time.sleep(3)
    print("i am in test")

test()