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Python每日知识点|Day13 异常捕获 try-exc

  • 2026-08-18 23:12:04
Python每日知识点|Day13 异常捕获 try-exc

Python每日知识点｜Day13 异常捕获 try-exc

今日核心知识点
程序运行时常出现各类报错：输入错误、除数为0、文件找不到、索引越界。异常捕获能够拦截运行错误，不让程序直接闪退，是写出稳健程序必备语法。
🌴基础语法原理
1.  try ：存放可能发生报错的代码；代码正常运行则跳过except
2.  except ：捕获try产生的异常，自定义错误处理逻辑
3.  else （可选）：try代码无异常的时候才执行
4.  finally （可选）：无论是否报错，一定会执行，多用于资源释放
🎈代码实操示例
try:
num = int(input("请输入数字："))
res = 10 / num
print("计算结果：", res)
except ValueError:
print("错误：输入不是有效数字！")
except ZeroDivisionError:
print("错误：除数不能为0！")
except Exception as e:
print("未知错误：", e)
⚠️新手易错点
1. 优先捕获具体异常，不建议直接滥用万能Exception
2. 不要把所有代码全部塞进try，只包裹容易报错的代码
3. finally非常适合关闭文件、断开网络等资源收尾操作
4. 异常捕获解决运行时错误，无法修复代码本身逻辑漏洞
🏖️今日小结
try监控风险代码，except拦截报错；
精准捕获优于全局捕获；
else正常运行触发，finally必定执行；
善用异常捕获，提高程序稳定性。
#Python #Python自学 #编程入门 #计算机基础 #零基础学编程 #每日编程打卡

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      1. CONNECT:[ UseTime:0.001125s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
      2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001993s ]
      3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000613s ]
      4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001764s ]
      5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001532s ]
      6. SELECT * FROM `set` [ RunTime:0.000604s ]
      7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001475s ]
      8. SELECT * FROM `article` WHERE `id` = 510207 LIMIT 1 [ RunTime:0.000980s ]
      9. UPDATE `article` SET `lasttime` = 1787297828 WHERE `id` = 510207 [ RunTime:0.032579s ]
      10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000617s ]
      11. SELECT * FROM `article` WHERE `id` < 510207 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001117s ]
      12. SELECT * FROM `article` WHERE `id` > 510207 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001072s ]
      13. SELECT * FROM `article` WHERE `id` < 510207 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.023712s ]
      14. SELECT * FROM `article` WHERE `id` < 510207 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001664s ]
      15. SELECT * FROM `article` WHERE `id` < 510207 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.019225s ]
      0.270668s