模拟登录

模拟登录需求：

1. 用户输入帐号密码进行登陆

2. 账户输入错误直接退出，账户正确，密码错误3次锁定

i = 1
a = 1
infor = {'zhanyie': 'abc123',
         'jack': '123bca',
         'tom': '132456'
         }
while i <= 3:
    name = input('please input your account: ')
    if name not in infor.keys():
        i += 1
        continue
    elif name in infor.keys():
        while a <= 3:
            password = input('please input your password:')
            if password == infor[name]:
                print('welcome')
                exit
            elif password != infor[name]:
                a += 1
                continue
        if a > 3:
            print(" You're locked")
            break
            
if i > 3:
    print('请注册一个账户')