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Python 变量交换|入门经典小案例

  • 2026-08-18 23:11:46
Python 变量交换|入门经典小案例

Python 变量交换｜入门经典小案例

两个、三个变量值交换，直接相互赋值，结果数据直接被覆盖。

借助临时临时变量中转，就像杯子倒水，先找个空杯子暂存数据。学会两个变量交换之后，可以挑战三个变量轮换的拓展练习。

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      1. CONNECT:[ UseTime:0.000658s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
      2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000602s ]
      3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000284s ]
      4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000246s ]
      5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000478s ]
      6. SELECT * FROM `set` [ RunTime:0.001725s ]
      7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000542s ]
      8. SELECT * FROM `article` WHERE `id` = 509076 LIMIT 1 [ RunTime:0.006631s ]
      9. UPDATE `article` SET `lasttime` = 1787313552 WHERE `id` = 509076 [ RunTime:0.004400s ]
      10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.001391s ]
      11. SELECT * FROM `article` WHERE `id` < 509076 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000537s ]
      12. SELECT * FROM `article` WHERE `id` > 509076 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000507s ]
      13. SELECT * FROM `article` WHERE `id` < 509076 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.017326s ]
      14. SELECT * FROM `article` WHERE `id` < 509076 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.016128s ]
      15. SELECT * FROM `article` WHERE `id` < 509076 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001644s ]
      0.226069s