<每日一题>题目2: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

 FLAG = False    #加一个变量防止多次登录验证
 def wrapper(f):
     def inner(*args,**kwargs):
         '''登录程序'''
         global FLAG #将FLAG变量设置成全局变量
         if FLAG:
             ret = f(*args, **kwargs)
             return ret
         else:
             username = input('username:')
             password = input('password:')
             if username == '' and password == '':
                 FLAG = True
                 ret = f(*args,**kwargs)
                 return ret
             else:
                 print('登录失败')
     return inner

 @wrapper
 def func_1():
     print('func1 is running!')

 @wrapper
 def func_2():
     print('func2 is running!')

 func_1()
 func_2()

　　运行结果:

 username:123
 password:345
 func1 is running!
 func2 is running!