python-装饰器

 #!/usr/bin/env python
 # -*- coding: utf-8 -*-
 # Auther: Summer

 1 # 装饰器本身带参数
 2 
 3 user, passwd = ‘summer‘,‘abc123‘
 4 
 5 def auth(auth_type):
 6     print(‘auth_type‘, auth_type)
 7     def outer_wrapper(func):
 8         def wrapper(*agrs,**kwargs):
 9             print("wrapper func",*agrs,**kwargs)
10             if auth_type == ‘local‘:
11                 username = input(‘please input your username:‘).strip()
12                 password = input(‘please input your password:‘).strip()
13                 if user == username and passwd == password:
14                     print("User has passed authentication")
15                     res = func(*agrs,**kwargs)
16                     print("----after authentication")
17                     return res
18                 else:
19                     print("Invalid username and password!")
20                     exit()
21             elif auth_type == ‘ldap‘:
22                 print("buhui")
23         return wrapper
24     return outer_wrapper
25 
26 @auth(‘local‘)
27 def index():
28     print(‘welcom to index page‘)
29 @auth(auth_type = ‘local‘)    # 相当于home = auth() 执行auth函数里面的outer_wrapper
30 def home():
31     print(‘welcome to home page‘)
32 @auth(auth_type = ‘ldap‘)
33 def bbs():
34     print(‘welcome to bbs page‘)
35 
36 index()
37 home()
38 bbs()

 1 #!/usr/bin/env python
 2 # -*- coding: utf-8 -*-
 3 # Auther: Summer
 4 
 5 # 返回值中包含函数名
 6 import time
 7 
 8 
 9 def bar():
10     time.sleep(3)
11     print(‘in the bar‘)
12 
13 def test2(func):   # 新功能
14     print(func)
15     return func
16 
17 # test2(bar)
18 # print(test2(bar))
19 t = test2(bar)
20 print(t)   # 打印bar的内存地址
21 t()        # 运行bar
22 bar = test2(bar)   #
23 bar()      # bar中加上了test2的功能，没有修改bar的调用方式

 1 # 函数的嵌套
 2 # 在一个函数的函数体内用def去声明一个函数
 3 
 4 def foo():
 5     print(‘in the foo‘)
 6 
 7     def bar():    #具有局部变量的特性，只能在内部调用
 8         print("in the bar")
 9     bar()
10 foo()
11 
12 
13 x = 0
14 def grandpa():
15     x =1
16     def dad():
17         x =2
18         def son():
19             x = 3
20             print(x)   # 函数的作用域，从里往外找
21         son()
22     dad()
23 grandpa()

 1 # 通用装饰器，可传参
 2 ‘‘‘
 3 1.不修改被装饰的函数的源代码
 4 2. 不修改被装饰的函数的调用方式
 5 ‘‘‘
 6 
 7 import time
 8 
 9 def timer(func):
10     def deco(*args,**kwargs):   # 定义一个高阶函数
11         start_time = time.time()
12         func(*args,**kwargs)   # 运行bar
13         stop_time = time.time()
14         print("the func run time is %s" %(stop_time-start_time))
15     return deco
16 
17 @timer
18 def test1():
19     time.sleep(1)
20     print(‘in the test1‘)
21 
22 @timer
23 def test2(name,age):
24     time.sleep(1)
25     print(‘in the test2:‘,name,age)
26 
27 test1()
28 test2(‘summer‘,24)