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备战金三银四之Python编程基础3

  • 2026-02-05 01:02:30
备战金三银四之Python编程基础3

备战金三银四之Python编程基础3

Python 字典（ dict ）是一种可变、无序（3.7+ 有序）、键值对存储的数据结构，核心是通过哈希表实现，查询速度极快。
一、核心特性
1. 键值对结构： {key: value} ，键唯一、值可重复。

2. 键的限制：必须是不可变类型（str/int/float/tuple/None），列表/字典不能作键。

3. 无序 → 有序：Python 3.7+ 保留插入顺序，3.6 及以下无序。

4. 可变：可增删改键值对。

5. 高效查询：O(1) 时间复杂度查找、插入、删除。

6. 可迭代：默认遍历键，也可遍历值/键值对。
二、常用操作示例
1. 创建与访问
如图

2. 增/改/删
如图

3. 遍历
如图

4. 字典推导式
如图

5. 合并字典
如图

6. 键的合法性示例
如图

三、常见内置方法
- keys() ：返回所有键

- values() ：返回所有值

- items() ：返回所有 (key, value)

- pop(key[, default]) ：删除并返回值

- update(dict2) ：合并字典

- clear() ：清空

- copy() ：浅拷贝

#软件测试面试 #软件测试 #软件测试自学 #自学软件测试 #编程 #软件测试技能 #Python编程 #字典 #金三银四 #程序员 #编程新手入门指南 #程序员成长之路 #技术提升秘籍 #Python字典基础教程 #备战金三银四Python #Python编程学习笔记 #Python哈希表原理 #字典数据结构详解 #如何高效使用字典 #Python实战技巧分享

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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 )
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  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:0.000572s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000828s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.100762s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.100779s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000755s ]
  6. SELECT * FROM `set` [ RunTime:0.100784s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000977s ]
  8. SELECT * FROM `article` WHERE `id` = 472734 LIMIT 1 [ RunTime:0.100747s ]
  9. UPDATE `article` SET `lasttime` = 1770460337 WHERE `id` = 472734 [ RunTime:1.777625s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.048589s ]
  11. SELECT * FROM `article` WHERE `id` < 472734 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.027678s ]
  12. SELECT * FROM `article` WHERE `id` > 472734 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.049570s ]
  13. SELECT * FROM `article` WHERE `id` < 472734 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.096074s ]
  14. SELECT * FROM `article` WHERE `id` < 472734 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.096800s ]
  15. SELECT * FROM `article` WHERE `id` < 472734 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.062770s ]
2.640925s