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Python基础之第三节数据类型和变量

  • 2026-08-20 21:21:31
Python基础之第三节数据类型和变量

一、变量

1. 变量作用

用来存数字、文字等数据，相当于一个盒子。

2. 赋值格式

变量名 = 值

3. 变量命名规则（必考）

  1. 只能由字母、数字、下划线组成
  2. 不能以数字开头
  3. 不能是 Python 自带单词（print、if、for 等）
  4. 区分大小写，A 和 a 是两个变量

4. 变量使用要点

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  1. CONNECT:[ UseTime:0.001170s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001693s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000660s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.029760s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001745s ]
  6. SELECT * FROM `set` [ RunTime:0.006092s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001830s ]
  8. SELECT * FROM `article` WHERE `id` = 504018 LIMIT 1 [ RunTime:0.001708s ]
  9. UPDATE `article` SET `lasttime` = 1787307593 WHERE `id` = 504018 [ RunTime:0.079682s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000837s ]
  11. SELECT * FROM `article` WHERE `id` < 504018 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001454s ]
  12. SELECT * FROM `article` WHERE `id` > 504018 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.010682s ]
  13. SELECT * FROM `article` WHERE `id` < 504018 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.011549s ]
  14. SELECT * FROM `article` WHERE `id` < 504018 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.013845s ]
  15. SELECT * FROM `article` WHERE `id` < 504018 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.031722s ]
0.277766s