Python_装饰器

1.装饰器的本质：函数

2.装饰器的功能：为其他函数添加附加功能（装饰其他函数）

3.装饰器的原则：不能修改被装饰函数的 a.源代码；b.调用方式（装饰器对原函数透明）

 

装饰器实例：

# -*- coding:utf-8 -*-
# Author:Soap

import time
def timer(flag):#装饰器判断层
    def wapper(func):#装饰器函数接受层
        def deco(*args,**kwargs):#装饰器函数体
            start_time = time.time()
            res = func(*args,**kwargs) #test1 执行
            stop_time = time.time()
            if flag == 'start time':
                print('the start time is %s'%(start_time))
            elif flag == 'stop time':
                print('the stop time is %s' % (stop_time))
            return res
        return deco
    return wapper

@timer('start time')
def test1(name):
    time.sleep(1)
    print('in the test1: ',name)
    return 0

@timer('stop time')
def test2(name):
    time.sleep(1)
    print('in the test2: ', name)
    return 0

print(test1('soap'))
print(test2('soap'))