Python-用户登录三次错误锁定

黑名单：blacklist.txt

用户名单：username_password.py

# Author:Stephen Yuan

# 用户名和密码
username_password = {
    'stephen': '123',
    'alex': '456',
    'sara': '789'
}

主程序：main.py

# Author: Stephen Yuan
import username_password
# import blacklist

username_password = username_password.username_password
print(username_password)

count = 0
while True:
    with open('blacklist.txt', 'r', encoding='utf-8') as blacklist:
        blacklist = blacklist.read().split()
        print(blacklist, type(blacklist))
    username = input("请输入用户名：")
    if username in blacklist:
        print("您的用户名已被锁定，请联系管理员！")
    elif username in username_password.keys():
        for i in range(3):
            userpass = input("请输入密码：")
            if userpass == username_password[username]:
                print("登录成功")
                exit()
            else:
                print("密码错误，请重新输入！")
                count += 1
            if count == 3:
                with open('blacklist.txt', 'a', encoding='utf-8') as blacklist2:
                    blacklist2.write(username + ' ')
                    print(blacklist)
                    print("当前的用户已经被锁定，请联系管理员！")
    else:
        print("用户名不存在，请重新输入！")