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Python知识点 | Day22 元组tuple

  • 2026-08-29 08:18:40
Python知识点 | Day22 元组tuple

Python知识点 | Day22 元组tuple

✨今日核心知识点
元组tuple属于不可变序列，使用小括号()定义。和列表很相似，最大区别：元组创建完成后不能修改、新增、删除内部元素，常用来存放不希望被改动的数据。
🌴基础语法原理
1. 定义格式： t = (1,2,3) ；只有单个元素必须写逗号  t=(5,) 
2. 核心特性：不可变，无法增删改元素；支持索引、切片查询
3. 适用场景：函数多返回值、字典key、固定配置数据
4. 元组内如果嵌套列表，列表内部元素允许修改
🎈代码实操示例
# 创建元组
t1 = (10,20,30)
# 单元素元组，逗号不能省略
t2 = (99,)
# 索引取值
print(t1[0])
# 元组解包
a,b,c = t1
⚠️新手易错点
1.  (5)  只是数字，单元素元组必须加上逗号 (5,)
2. 元组本身不可变，但若包含列表，列表内容能够修改
3. 没有append()、remove()等修改类方法，仅支持查询操作
4. 元组可以使用  tuple(列表)  将列表转为元组
🏖️今日小结
元组 = 只读版本的列表。数据确定、不允许修改时优先选用元组；记住单元素逗号规范。如果后续需要改动数据，就使用列表list。
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      137. /yingpanguazai/ssd/ssd1/www/f.mffb.com.cn/vendor/topthink/think-template/src/template/driver/File.php ( 2.41 KB )
      138. /yingpanguazai/ssd/ssd1/www/f.mffb.com.cn/vendor/topthink/think-template/src/template/contract/DriverInterface.php ( 0.86 KB )
      139. /yingpanguazai/ssd/ssd1/www/f.mffb.com.cn/runtime/temp/067d451b9a0c665040f3f1bdd3293d68.php ( 11.98 KB )
      140. /yingpanguazai/ssd/ssd1/www/f.mffb.com.cn/vendor/topthink/think-trace/src/Html.php ( 4.42 KB )
      1. CONNECT:[ UseTime:0.001012s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
      2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001560s ]
      3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000746s ]
      4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000709s ]
      5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001449s ]
      6. SELECT * FROM `set` [ RunTime:0.000532s ]
      7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001460s ]
      8. SELECT * FROM `article` WHERE `id` = 512337 LIMIT 1 [ RunTime:0.002025s ]
      9. UPDATE `article` SET `lasttime` = 1788020357 WHERE `id` = 512337 [ RunTime:0.011872s ]
      10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000604s ]
      11. SELECT * FROM `article` WHERE `id` < 512337 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001238s ]
      12. SELECT * FROM `article` WHERE `id` > 512337 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001214s ]
      13. SELECT * FROM `article` WHERE `id` < 512337 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002667s ]
      14. SELECT * FROM `article` WHERE `id` < 512337 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003224s ]
      15. SELECT * FROM `article` WHERE `id` < 512337 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002076s ]
      0.205061s