装饰器修正

1.import time

def index():
    print('welcome to index')
    time.sleep(3)
    return 123  # 被装饰对象带返回值

def home(name): # 带上参数的被装饰对象
    print('welcome %s to home page' %name)
    time.sleep(2)


def timmer(func):
    #func=最原始的index
    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


index=timmer(index)
home=timmer(home)

res=index()
home('egon')











2.装饰器语法糖
在被装饰对象正上方，并且是单独一行写上@装饰器名
放在被装饰对象上面表示接受被装饰对象作为参数，并且返回值为被装饰对象。

import time
def timmer(func):
    #func=最原始的index
    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

@timmer # index=timmer(index)
def index():
    print('welcome to index')
    time.sleep(3)
    return 123

@timmer # home=timmer(home)
def home(name):
    print('welcome %s to home page' %name)
    time.sleep(2)

res=index()
home('egon')








def deco(func):
    def wrapper(*args,**kwargs):
        res=func(*args,**kwargs)
        return res
    return wrapper