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一名 PHP 工程师的 Python 系统学习笔记(05):异常处理与错误设计

  • 2026-02-07 20:28:33
一名 PHP 工程师的 Python 系统学习笔记(05):异常处理与错误设计

一名 PHP 工程师的 Python 系统学习笔记(05):异常处理与错误设计

真正拉开 Python 代码质量差距的,往往不是业务复杂度,而是你怎么处理错误。

很多人初学 Python,对异常的理解停留在:

try:    ...except Exception:pass

代码不报错了,但问题也被一起吞掉了

这一篇只讲一件事:在工程里,Python 的异常到底该怎么用。


一、异常不是“失败”,而是一种控制流

在 Python 中,异常是被设计成常态机制的。

defdiv(a, b):return a / b
div(100)  # ZeroDivisionError

👉 Python 的选择很明确:

与其返回错误码,不如直接打断执行。

这和 PHP 早期“返回 false”的风格,有本质区别。


二、不要用 Exception 当“万能兜底”

try:    risky()except Exception:    handle()

这在工程里是高危写法

更合理的方式是:

try:    risky()except ValueError:    handle_value()except IOError:    handle_io()

👉 你捕获的异常,应该是你“预期会发生的”。


三、异常应该“离问题近,离入口远”

一个常见反模式:

defread_conf():try:return open("conf.txt").read()except Exception:returnNone

这样做的问题是:

  • 错误来源被抹平
  • 调用方无法判断失败原因

更好的方式:

defread_conf():return open("conf.txt").read()

更高层统一处理异常

👉 原则一句话:

异常要在“知道如何处理”的地方捕获。


四、自定义异常,比你想象中重要

classConfigError(Exception):pass
ifnot conf:raise ConfigError("config not found")

工程意义只有一个:

👉 用异常类型,表达业务语义。

这比返回字符串、错误码都清晰得多。


五、finally 的唯一职责

try:    f = open("a.txt")    work(f)finally:    f.close()

finally 只做一件事:

资源回收。

不要在 finally 里写业务逻辑。


六、异常 vs 返回值:工程选择

  • 可恢复、预期内的结果 → 返回值
  • 不可继续、状态异常 → 抛异常

👉 不要混用,否则调用方会非常痛苦。


七、这一篇你只需要记住 5 件事

  1. 异常是正常控制流的一部分
  2. 精确捕获异常,而不是 Exception
  3. 在“知道怎么处理”的地方捕获
  4. 用自定义异常表达业务错误
  5. finally 只负责清理资源

八、完整示例

import jsondefload_config(path: str) -> dict:"""    读取并解析配置文件    """with open(path, "r", encoding="utf-8"as f:try:return json.load(f)except json.JSONDecodeError as e:raise ConfigError("配置文件格式错误"from eclassConfigError(Exception):"""配置相关错误"""passclassDBConnectionError(Exception):"""数据库连接错误"""passdefconnect_db(conf: dict):"""    模拟数据库连接    """    print(f"正在连接数据库:{conf}")if"host"notin conf:raise DBConnectionError("缺少数据库 host 配置")if conf.get("host") == "bad_host":raise DBConnectionError("数据库连接失败")    print("数据库连接成功")return"db_connection"defmain():try:        conf = load_config("config/day5_config.json")        db = connect_db(conf)        print(f"系统启动完成: {db}")except ConfigError as e:        print(f"[配置错误] {e}")except DBConnectionError as e:        print(f"[数据库错误] {e}")except Exception as e:# 真正的兜底:记录 + 报警        print(f"[未知错误] {e}")main()

写在最后

很多 Python 项目,后期变得难维护,

问题往往不是功能复杂,而是:

错误被悄悄吃掉了。

下一篇我会继续写一个和异常高度相关、但经常被忽略的话题:

上下文管理器 with:如何优雅地管理资源

如果你也是从 PHP / Go 转 Python,希望这个系列能真正帮你建立工程级直觉。

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  1. CONNECT:[ UseTime:0.000332s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000689s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.004066s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.004685s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000533s ]
  6. SELECT * FROM `set` [ RunTime:0.000201s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000584s ]
  8. SELECT * FROM `article` WHERE `id` = 467853 LIMIT 1 [ RunTime:0.014919s ]
  9. UPDATE `article` SET `lasttime` = 1770472986 WHERE `id` = 467853 [ RunTime:0.044028s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000260s ]
  11. SELECT * FROM `article` WHERE `id` < 467853 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.006448s ]
  12. SELECT * FROM `article` WHERE `id` > 467853 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.009440s ]
  13. SELECT * FROM `article` WHERE `id` < 467853 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.037005s ]
  14. SELECT * FROM `article` WHERE `id` < 467853 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.027967s ]
  15. SELECT * FROM `article` WHERE `id` < 467853 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.202944s ]
0.422113s