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Python学习笔记Day002

  • 2026-03-06 02:52:26
Python学习笔记Day002

Day002主要学习内容:

1.建立一个列表；
2.查看并打印列表中有多少个元素；
3.获取列表中第1个、最后1个元素并打印，尤其是通过[-1]获取最后一个元素的方法；
4.超出元素个数了报错信息（会报“IndexError”错误）。
5.预习列表中元素的添加、删除。

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  1. 请求信息 : 2026-03-06 10:30:11 HTTP/2.0 GET : https://67808.cn/a/472434.html
  2. 运行时间 : 0.135691s [ 吞吐率：7.37req/s ] 内存消耗：4,808.76kb 文件加载：140
  3. 缓存信息 : 0 reads,0 writes
  4. 会话信息 : SESSION_ID=e9fcc1a7aca6957b1b4b3962aedf6b21
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  1. CONNECT:[ UseTime:0.000522s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000664s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.001944s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.005386s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000633s ]
  6. SELECT * FROM `set` [ RunTime:0.000893s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000715s ]
  8. SELECT * FROM `article` WHERE `id` = 472434 LIMIT 1 [ RunTime:0.002478s ]
  9. UPDATE `article` SET `lasttime` = 1772764212 WHERE `id` = 472434 [ RunTime:0.004709s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000287s ]
  11. SELECT * FROM `article` WHERE `id` < 472434 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001095s ]
  12. SELECT * FROM `article` WHERE `id` > 472434 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.008130s ]
  13. SELECT * FROM `article` WHERE `id` < 472434 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.007899s ]
  14. SELECT * FROM `article` WHERE `id` < 472434 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.016546s ]
  15. SELECT * FROM `article` WHERE `id` < 472434 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.006326s ]
0.137369s