<python>编写装饰器,为多个函数加上认证功能(用户账号和密码来源于文件)

　　这里做个最简单的账号密码验证,主要为了实现装饰器同时对多个函数起作用

 1 FLAG = False    #加一个变量防止多次登录验证
 2 def wrapper(f):
 3     def inner(*args,**kwargs):
 4         '''登录程序'''
 5         global FLAG #将FLAG变量设置成全局变量
 6         if FLAG:
 7             ret = f(*args, **kwargs)
 8             return ret
 9         else:
10             username = input('username:')
11             password = input('password:')
12             if username == '123' and password == '345':
13                 FLAG = True
14                 ret = f(*args,**kwargs)
15                 return ret
16             else:
17                 print('登录失败')
18     return inner
19 
20 @wrapper
21 def func_1():
22     print('func1 is running!')
23 
24 @wrapper
25 def func_2():
26     print('func2 is running!')
27 
28 func_1()
29 func_2()

　　运行结果:

1 username:123
2 password:345
3 func1 is running!
4 func2 is running!