79 lines
2.4 KiB
Markdown
79 lines
2.4 KiB
Markdown
# 基于文件的用户管理
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## 需求
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### 数据库文件设计
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- 创建db文件，并且保存用户名、密码、剩余登录次数、解封的时间，示例如下
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```
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user01|123456|3|1733039528
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user02|123123|3|1733039528
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user03|121212|2|1733039528
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```
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### 登录功能
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- 用户输入正确的用户名和密码，就可以登录
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- 用户输入错误的用户名，提示用户名不存在
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- 用户名正确，但是密码错误，就提示密码错误，输入错误3次，就封号30秒
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- 用户名正确，只要是封号期间，不管密码是否正确，都提示已封号，还有xx秒解封
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- 用户名正确，如果已经解封，就正常登录
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## 参考代码
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```python
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import time
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# 数据库文件路径
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db_file = 'db'
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# 读取数据库文件，返回用户信息字典
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users = {}
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with open(db_file, 'a+') as file:
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file.seek(0)
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for line in file:
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username, password, attempts, ban_time = line.strip().split('|')
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users[username] = {
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'password': password,
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'attempts': int(attempts),
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'ban_time': int(ban_time)
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}
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# 主程序
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while True:
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username = input("请输入用户名：")
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if username not in users:
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print("用户名不存在。")
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continue
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if users[username]['attempts'] <= 0 and users[username]['ban_time'] > int(time.time()):
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remaining_time = users[username]['ban_time'] - int(time.time())
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print(f"已封号，还有{remaining_time}秒解封。")
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continue
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password = input("请输入密码：")
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if password == users[username]['password']:
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users[username]['attempts'] = 3 # 重置尝试次数
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print("登录成功。")
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else:
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users[username]['attempts'] -= 1
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if users[username]['attempts'] == 0:
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users[username]['ban_time'] = int(time.time()) + 30 # 封号30秒
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print("密码错误，账号已被封禁30秒。")
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else:
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print("密码错误，剩余尝试次数：", users[username]['attempts'])
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# 将更新后的用户信息写回数据库文件
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with open(db_file, 'w') as file:
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for user, info in users.items():
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file.write(f"{user}|{info['password']}|{info['attempts']}|{info['ban_time']}\n")
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```
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><span style="color: red; background: yellow; padding: 2px 5px; font-size: 22px;">作业4.1提交的内容</span>
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>
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>- 理解程序的运行逻辑
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>- 程序运行成功的截图，单独发送给组长
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