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Python 字典笔记:键值对基础操作梳理

  • 2026-08-18 23:11:29
Python 字典笔记:键值对基础操作梳理

Python 字典笔记：键值对基础操作梳理

字典以键值对形式存储数据，适合具有对应关系的数据。本文整理字典创建、取值、新增修改、常用方法，搭配示例，可供零基础学习者参考练习。

列表依靠序号查找数据，想要自定义标记检索内容，可以使用字典。很多新手容易忽略字典键的使用规则，运行代码产生异常。

持续更新零基础 Python 学习路线
#Python 零基础学习 #Python 学习笔记 #编程入门#Python 字典 #自学 Python #中年人学 Python# 新手学编程 #Python 基础#Python 怎么安装#Python 新手怎么练#Python 变量是什么#Python 列表怎么用#Python 字典通俗讲解#Python 函数入门#Python 循环 for while#Python 保姆级教程

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  1. CONNECT:[ UseTime:0.000833s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001298s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000709s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000565s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001340s ]
  6. SELECT * FROM `set` [ RunTime:0.000650s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001497s ]
  8. SELECT * FROM `article` WHERE `id` = 507717 LIMIT 1 [ RunTime:0.005653s ]
  9. UPDATE `article` SET `lasttime` = 1787313632 WHERE `id` = 507717 [ RunTime:0.001880s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000586s ]
  11. SELECT * FROM `article` WHERE `id` < 507717 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.008262s ]
  12. SELECT * FROM `article` WHERE `id` > 507717 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.017022s ]
  13. SELECT * FROM `article` WHERE `id` < 507717 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.068839s ]
  14. SELECT * FROM `article` WHERE `id` < 507717 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.011120s ]
  15. SELECT * FROM `article` WHERE `id` < 507717 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.014201s ]
0.301234s