装饰器的语法糖

# _*_ coding: utf-8 _*_

# 装饰器的语法糖

# @装饰器的名字：要在被装饰对象正上方单独一行写上

import time
# 引用time内置函数

def timmer(func):

    def wrapper(*args, **kwargs):
        start = time.time()
        res = func(*args, **kwargs)
        stop = time.time()
        print('Run time is %s' %(stop - start))
        return res
    return wrapper

#（new）index = timmer(（旧）index的内存地址 = func)
# index的内存地址 = func
@timmer
def index():
    print('Welcome to index page')
    time.sleep(1)

@timmer#home = timmer(home)
def home(name):
    print('welcome %s to home page' %name)
    time.sleep(1)
    return 888

index()
res = home('oOC')
print(res)

####无参装饰器模版####
def outter(func):
    def wrapper(*args,**kwargs):
        #在调用函数前加功能
        res=func(*args,**kwargs) #调用被装饰的\也就是最原始的那个函数
        #在调用函数后加功能
        return res
    return wrapper


# ////////////////////////////////////////////////////

@outter #index=outter(index) #index=wrapper
def index():
    print('welcome to index page')
    time.sleep(3)

index()