python模拟登陆

"""
练习题2 —— 模拟登陆：

用户输入帐号密码进行登陆

用户信息保存在文件内

用户密码输入错误三次后锁定用户，下次再登录，检测到是这个用户也登录不了
"""
import json

num = 0
Flag = True
with open('userinfo.txt', 'r', encoding='utf-8') as f:
    data = f.readline().strip()
    user_dic = json.loads(data.replace("'", '"'))

    while True:
        userName = input("用户名>>>:").strip()
        with open('user_lock.txt', 'r', encoding='utf-8')as f_lock:
            user_lock_dic = json.loads(f_lock.read())
            if userName not in user_lock_dic:
                if userName in user_dic:
                    print(1)
                    pwd = input("输入密码：")
                    if pwd != user_dic[userName]:
                        print("密码输入错误")
                        num += 1
                        if num == 3:
                            print("账号被锁定")
                            with open('user_lock.txt', 'w', encoding='utf-8') as f_lock_append:
                                user_lock_dic.append(userName)
                                f_lock_append.write(json.dumps(user_lock_dic))
                            break
                    else:
                        print("登录成功")
                        break
                else:
                    print("用户名不存在")
                    break
            else:
                print("账号被锁定")
                break