python 装饰器

 1 import time
 2 
 3 # 定义装饰器（含两个def,就是所说的函数嵌套）
 4 def packing(func):
 5     print(‘in the packing‘)
 6 
 7     def deco(*args, **kwargs):
 8         start_time = time.time()
 9         func(*args, **kwargs)
10         stop_time = time.time()
11         print(‘the func run ‘, stop_time-start_time)
12     return deco  # 返回函数内存地址（能返回函数内存地址的函数就是高阶函数）
13 
14 
15 @packing     # 等价于 test1 = packing(test1)(取得了deco的内存地址)
16 def test1(name):
17     time.sleep(1)
18     print(‘int the test1‘, name)
19 
20 
21 @packing
22 def test2(age, sex):
23     time.sleep(0.3)
24     print(‘in the test2‘, age, sex)
25 
26 
27 test1(‘alex‘)  # 相当于执行deco() 函数调用，装饰器才起作用
28 test2(17, ‘F‘)  # 相当于执行deco() 函数调用，装饰器才起作用

 1 usrname = ‘alex‘
 2 passwd = ‘123456‘
 3 def auth(auth_type):
 4     def outpacking(func):
 5         def packing(*args, **kwargs):
 6             if auth_type == ‘local‘:
 7                 name = input(‘input your usrname:\n‘)
 8                 pd = input(‘input your passowrd:\n‘)
 9                 if usrname == name and passwd == pd:
10                     print(‘welcom %s‘ %usrname)
11 
12                 else:
13                     print(‘\033[31;1minvalid usrname or password\033[0m‘)
14                     exit()
15             elif auth_type == ‘remote‘:
16                 print(‘remote access your account‘)
17             func(*args, **kwargs)
18         return packing
19     return outpacking
20 
21 def index():
22     print(‘welcom to the index page‘)
23 
24 
25 @auth(auth_type=‘local‘)
26 def home():
27     print(‘welcom to home page‘)
28 
29 @auth(auth_type=‘remote‘)
30 def bbs():
31     print(‘welcom to the bbs page‘)
32 
33 
34 index()
35 home()
36 bbs()