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python基础---元组Tuple

  • 2026-02-10 00:01:30
python基础---元组Tuple
另一种有序列表叫元组：tuple ，它和List非常类似，但是tuple一旦被初始化后就不能修改，不能修改的tuple有什么意义？因为它不能被修改，所以代码更安全。不会被意外修改
元组的定义方式t =(1,2),  要定义只有一个元素的tuple时 t =(1,) 后面需要有一个逗号，是为了和数学运算的括号做区分
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  1. CONNECT:[ UseTime:0.000765s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
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  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000346s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000245s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000479s ]
  6. SELECT * FROM `set` [ RunTime:0.000204s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000557s ]
  8. SELECT * FROM `article` WHERE `id` = 474672 LIMIT 1 [ RunTime:0.000324s ]
  9. UPDATE `article` SET `lasttime` = 1770664319 WHERE `id` = 474672 [ RunTime:0.077035s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.006071s ]
  11. SELECT * FROM `article` WHERE `id` < 474672 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.023062s ]
  12. SELECT * FROM `article` WHERE `id` > 474672 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.002271s ]
  13. SELECT * FROM `article` WHERE `id` < 474672 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.010759s ]
  14. SELECT * FROM `article` WHERE `id` < 474672 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001867s ]
  15. SELECT * FROM `article` WHERE `id` < 474672 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.011130s ]
0.281774s