1 #!user/bin/env python
 2 # -*- coding:utf-8 -*-
 3 
 4 import time
 5 
 6 
 7 def timer(func):    # timer(test1), 将test1的内存地址传给func; 其实最终通过return返回deco的内存地址
 8     def deco():
 9         start_time = time.time()
10         func()
11         stop_time = time.time()
12         print(‘the func run time is %s‘ %(stop_time-start_time))
13     return deco   # 直接返回deco函数的内存地址，如此下面test1 = deco(test1),如此test1()就可以正常调用
14 
15 
16 @timer       # 就是一步运行工作，等于test1 = timer(test1) 注意此处不能加括号，因为装饰的函数，而test1()是一个返回值
17 def test1():
18     time.sleep(3)
19     print(‘in the test1‘)
20 
21 
22 test1()              # 此时test1 执行的是deco的内存地址，因为timer函数中的return deco
23 print(test1)         # 被装饰过的test1的内存地址返回： <function timer.<locals>.deco at 0x00000244D3824048>

#!user/bin/env python
# -*- coding:utf-8 -*-

import time


def timer(func):    # 将test2的内存地址传给func
    def deco(*args,**kwargs):   # 用非固定参数*args, **kwargs;如此满足有参数，和没有参数的被装饰函数
        start_time = time.time()
        func(*args,**kwargs) 
        stop_time = time.time()
        print(‘the func run time is %s‘ %(stop_time-start_time))
    return deco   # 直接返回deco函数的内存地址

@timer         # test2 = timer(test2）= deco; test2() = deco(); 所以当test2有函数变量，deco也需要加函数变量。
def test2(name):  # test2本身带参数
    time.sleep(3)
    print(‘in the test2‘)

test2(‘alex‘)

 1 #!user/bin/env python
 2 # -*- coding:utf-8 -*-
 3 
 4 user,passwd = ‘alex‘,‘abc123‘
 5 
 6 def auth(func):
 7     def wrapper(*args,**kwargs):
 8         username = input(‘Username‘).strip()
 9         password = input(‘Password‘).strip()
10 
11         if user == username and passwd == password:
12             print("\033[32;1mUser has passed authorization\033[0m")
13             res = func(*args,**kwargs)    # 赋值
14             return res                              # 返回res
15         else:
16             exit(‘\033[31;1mInvalid username or password\033[0m‘)
17     return wrapper    # 返回wrapper的内存地址
18 
19 @auth(auth_type="local")
20 def home():
21     print(‘welcome to home page‘)
22     return "from home"
23 
24 print(home())   #打印返回from home 

 1 #!user/bin/env python
 2 # -*- coding:utf-8 -*-
 3 
 4 # 例三：带参数的装饰器(终结版装饰器）
 5 # 情景要求: 配用多种认证方式。 home()认证方式用本地local认证，bbs()用远程的ldap
 6 
 7 user,passwd = ‘alex‘,‘abc123‘
 8 
 9 
10 def auth(auth_type):   # home()的can
11     def outer_wrapper(func):
12         def wrapper(*args,**kwargs):
13             username = input(‘Username‘).strip()
14             password = input(‘Password‘).strip()
15 
16             if user == username and passwd == password:
17                 print("\033[32;1mUser has passed authorization\033[0m")
18                 res = func(*args,**kwargs)    # 赋值
19                 return res                   # 返回res
20             else:
21                 exit(‘\033[31;1mInvalid username or password\033[0m‘)
22         return wrapper    # 返回wrapper的内存地址
23     return outer_wrapper
24 
25 def index():
26     print(‘welcome to index page‘)
27 
28 
29 @auth(auth_type="local")
30 def home():
31     print(‘welcome to home page‘)
32     return "from home"
33 
34 home()
35 
36 @auth(auth_type="ldap")
37 def bbs():
38     print(‘welcome to bbs page‘)
39 
40 bbs()