1.1

# -*- coding: utf-8 -*-
# 基础需求
"""
让用户输入用户名密码
认证成功后显示欢迎信息
输错三次退出程序
"""
_username = "alice"
_password = "123"
count = 0

while count < 3:
    username = input("Username:")
    password = input("Password:")
    if username == _username and password == _password:
        print("登录成功！")
        break
    else:
        print("登录失败！")
    count += 1

# -*- coding: utf-8 -*-
# 升级需求
"""
可以支持多个用户登录
用户3次认证失败后，退出程序，再次启动程序尝试登录时，是锁定状态
需把锁定状态存到文件中
"""
import os
_listname = ['alice', 'alex', 'lily']
_password = "123"
count = 0
while count < 3:
    if os.path.exists('lock_file.txt'):
        f = open('lock_file.txt', 'r', encoding='utf-8')
        if '3次' in f.read():
            print('用户已锁定')
            f.close()
            break
    username = input("Username:")
    password = input("Password:")
    if password == _password:
        if not username in _listname:
            print("登录失败！")
        else:
            print("登录成功！")
            break
    else:
        print("登录失败！")
    count += 1
else:
    print('失败', '次数', '3次', sep='->', end='
', file=open('lock_file.txt', 'w', encoding='utf-8'))