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1月12日-python学习日记

  • 2026-01-15 14:42:36
1月12日-python学习日记
今天学习了列表的常见操作
1 列表的插入功能
    insert是指定位置，list.insert（序号，元素）
2 append是尾部插入，list.append（元素）
    但是从尾部追加的元素数量看，append只能加元素
    extend可以扩展追加列表，也就是多个
    list.extend(列表）
3 列表的删除功能
    del list[序号],这个del的语法比较特殊
    pop的话是不一样的逻辑 ，是把这个元素返回出来，可以用变量接收
    my_list.pop(序号)
    还有一个就是remove，直接移除对应的元素,从前到后搜索，找到的第     一个删除掉
    list.remove(元素）
4然后是统计指定元素的数量，只能同级统计
    list.count(元素)
    len(list）可以计算列表中的元素个数
5然后的list.clear清除所有的列表元素
还是挺容易搞混的，得靠练习记住呀。
加油！
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  1. CONNECT:[ UseTime:0.000573s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000598s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.002491s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.003700s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000652s ]
  6. SELECT * FROM `set` [ RunTime:0.001315s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000728s ]
  8. SELECT * FROM `article` WHERE `id` = 462833 LIMIT 1 [ RunTime:0.015123s ]
  9. UPDATE `article` SET `lasttime` = 1770555922 WHERE `id` = 462833 [ RunTime:0.021984s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000494s ]
  11. SELECT * FROM `article` WHERE `id` < 462833 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001636s ]
  12. SELECT * FROM `article` WHERE `id` > 462833 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001217s ]
  13. SELECT * FROM `article` WHERE `id` < 462833 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.103996s ]
  14. SELECT * FROM `article` WHERE `id` < 462833 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.110144s ]
  15. SELECT * FROM `article` WHERE `id` < 462833 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.037564s ]
0.368797s