【每日一练】装饰器
写一个用户登录认证函数，要求：
1.要求用户输入账号密码和txt中的用户名数据库对比；
2.要求用户有三次尝试机会；
3.要求用户登陆后，执行其他功能无需再验证；
4.要求拥有超时重新登录功能；
txt数据：
{'auth_name':'user0', 'auth_passwd':'123'}
{'auth_name':'user1', 'auth_passwd':'123'}
{'auth_name':'user2', 'auth_passwd':'123'}
{'auth_name':'user3', 'auth_passwd':'123'}
1 import time 2 3 current_state = {'user': None, 'login': False} 4 count = 3 5 start = 0 6 end = 0 7 8 9 def login(fun): 10 global count 11 global start 12 while count > 0: 13 user_name = input('enter your user name:\n') 14 passwd = input('enter your user password:\n') 15 with open('test', 'r') as f: 16 for item in f: 17 item = eval(item) 18 if item['name'] == user_name and item['passwd'] == passwd: 19 print('login success.') 20 current_state['user'] = user_name 21 current_state['login'] = True 22 res = fun() 23 start = time.time() 24 return res 25 else: 26 count -= 1 27 print('the user name or password is wrong ,you have %d times.' % count) 28 continue 29 else: 30 print('three times failed, please try later.') 31 32 33 def auth(fun): 34 def user_auth(*args, **kwargs): 35 global end 36 global start 37 global count 38 if end - start < 2: 39 if current_state['user'] and current_state['login']: 40 res = fun(*args, **kwargs) 41 end = time.time() 42 return res 43 else: 44 login(fun) 45 else: 46 start = 0 47 end = 0 48 count = 3 49 current_state['user'] = None 50 current_state['login'] = False 51 print('time out ,login again.') 52 login(fun) 53 return user_auth 54 55 56 @auth 57 def log(): 58 print('welcome logging %s.' % current_state['user']) 59 60 61 @auth 62 def home(): 63 time.sleep(2) 64 print('welcome to home index.') 65 66 67 @auth 68 def shoping_car(): 69 time.sleep(2) 70 print('welcome to shopping car.') 71 72 73 log() 74 home() 75 shoping_car()
