秒懂装饰器(带传参和返回值)

#-*- coding:utf-8 -*-
import time


'''传入的参数为func,即函数名(函数的地址),不是func(),若是func()即把函数的运行结果传入了timer'''
def timer(func): #将函数名传递给另一个函数作为参数,称之为高阶函数
    def deco(*args,**kargs):#在函数内定义一个函数,称之为函数的嵌套
        start_time=time.time()
        res=func(*args,**kargs)
        stop_time=time.time()
        print("the cost time is %s" %(stop_time-start_time))
        return res
    return deco

@timer #相当于test1=timer(test1),即把deco的地址给了test1
def test1():
    time.sleep(1)
    print("in the test1")
@timer
def test2(name,age):
    time.sleep(2)
    print("in the test2",name,age)
    return "test2 is running"

test1()
print(test2("kid",20))
in the test1
the cost time is 1.0076828002929688
in the test2 kid 20
the cost time is 2.0213704109191895
test2 is running

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