python学习-43 装饰器 -- 函数闭包2

函数闭包为函数加上认证功能

 

1.登陆账号

user_dic ={'username':None,'login':False}

def auth_func(func):
    def wrapper(*args,**kwargs):


        if user_dic['username'] and user_dic['login']:
            res = func(*args,**kwargs)
            return res

        username = input('账号:').strip()
        passwd = input('密码:').strip()
        if username == 'abcd' and passwd == '123456':
            user_dic['username'] = username
            user_dic['login'] = True
            print('登陆成功！')
            res=func(*args,**kwargs)
            return res
        else:
            print('用户名或密码错误')
    return wrapper

@auth_func
def index():
    print('欢迎光临本网站')


@auth_func
def home(name):
    print('欢迎%s回家' % name)



index()
home('小明')

运行结果：

账号:abcd
密码:123456
登陆成功！
欢迎小明回家

Process finished with exit code 0

 

2.检测已有账号登陆

 

user_list=[{'name':'abcd','passwd':'123456'},
           {'name':'abd','passwd':'123'},
           {'name':'acc','passwd':'123456'},
           {'name':'asdfg','passwd':'12346'}
]
user_dac ={'username':None,'login':False}           # 获取刚开始登陆之前的状态

def auth_func(func):
    def wrapper(*args,**kwargs):

        if user_dac['username'] and user_dac['login']:   # 获取刚开始登陆之前的状态，是否已登录
            res = func(*args,**kwargs)
            return res

        username = input('账号:').strip()
        passwd = input('密码:').strip()
        for user_dic in user_list:
            if username == user_dic['name'] and passwd == user_dic['passwd']:
                user_dac['username'] = username
                user_dac['login'] = True
                print('登陆成功！')
                res=func(*args,**kwargs)
                return res
        else:
            print('用户名或密码错误')
    return wrapper

@auth_func
def index():
    print('欢迎光临本网站')


@auth_func
def home(name):
    print('欢迎%s回家' % name)



index()
home('sb')

运行结果：

账号:abd
密码:123
登陆成功！
欢迎光临本网站
欢迎sb回家

Process finished with exit code 0