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Python社团 逻辑运算符教学

  • 2026-06-28 14:25:43
Python社团 逻辑运算符教学

先铺垫布尔值基础，核心讲解not（取反）、and（全真才真）、or（一真即真）三大运算符，明确优先级not>and>or，强调括号避坑，拓展短路逻辑，专项突破易错点，结合场景化阶梯练习，贴合学生认知循序渐进落地。

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  1. CONNECT:[ UseTime:0.000795s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001026s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000372s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000302s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000653s ]
  6. SELECT * FROM `set` [ RunTime:0.000248s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000778s ]
  8. SELECT * FROM `article` WHERE `id` = 489076 LIMIT 1 [ RunTime:0.000459s ]
  9. UPDATE `article` SET `lasttime` = 1783145302 WHERE `id` = 489076 [ RunTime:0.021101s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000444s ]
  11. SELECT * FROM `article` WHERE `id` < 489076 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000691s ]
  12. SELECT * FROM `article` WHERE `id` > 489076 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000774s ]
  13. SELECT * FROM `article` WHERE `id` < 489076 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.009305s ]
  14. SELECT * FROM `article` WHERE `id` < 489076 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.021583s ]
  15. SELECT * FROM `article` WHERE `id` < 489076 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.016876s ]
0.164196s