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Python if 语句进阶吃透条件分支

  • 2026-08-26 17:50:04
Python if 语句进阶吃透条件分支

Python if 语句进阶吃透条件分支

if 不只是简单二选一，学会多条件、多分支、嵌套、逻辑组合，写判断代码不再踩坑。

掌握 if‑else、elif 多分支、条件嵌套、and/or 多条件组合，看懂执行逻辑，避开常见缩进报错。

搭配简易示例，理解代码执行流程，快速把判断逻辑用到实际脚本里。

#Python #Python 零基础 #if 语句 #Python 条件判断 #编程入门

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      1. CONNECT:[ UseTime:0.000996s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
      2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001637s ]
      3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000680s ]
      4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000671s ]
      5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001431s ]
      6. SELECT * FROM `set` [ RunTime:0.000620s ]
      7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001544s ]
      8. SELECT * FROM `article` WHERE `id` = 512282 LIMIT 1 [ RunTime:0.001007s ]
      9. UPDATE `article` SET `lasttime` = 1787771945 WHERE `id` = 512282 [ RunTime:0.069917s ]
      10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.006212s ]
      11. SELECT * FROM `article` WHERE `id` < 512282 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001680s ]
      12. SELECT * FROM `article` WHERE `id` > 512282 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.004344s ]
      13. SELECT * FROM `article` WHERE `id` < 512282 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.035260s ]
      14. SELECT * FROM `article` WHERE `id` < 512282 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.008933s ]
      15. SELECT * FROM `article` WHERE `id` < 512282 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.007120s ]
      0.319606s