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dict的嵌套与数据处理|Python自学成才(番外篇7)

  • 2026-07-02 16:30:05
dict的嵌套与数据处理|Python自学成才(番外篇7)

Python自学成才(番外篇7)|dict的嵌套与数据处理

前一篇我们讲了 dict 的一些内置函数。这一篇,我们接着对 dict 的相关内容进行补充,主要是利用 dict 本身的一些特性所能完成的一些数据结构和数据处理方面的操作。

字典的嵌套与数据多样性

字典的嵌套

由于 dict 本身的特性,要求:

  • key 为不可更改的数据类型,如数字、字符串等,便于生成索引加速数据查询。
  • value 则相对灵活,基本可以是任何数据类型,包括自定义的类创建的对象。

借用此性质,可以完成字典的嵌套,即某个 key 的 value 也是一个字典(这一结构在 JSON 数据的解析上极为重要):

user = {"name""RainBomb","info": {"age"18,"address""China"    }}print(user["info"]["address"])# Output: China

由于 value 也是字典,因此 user["info"] 得到的就是字典,同样能对其使用中括号操作取值。

字典内容的多样性

由于 value 的灵活,我们能用字典存储各种千奇百怪的数据:

import datetimeclass User:def __init__(self, name, age):self.name = nameself.age = ageinfo = {"user": User("RainBomb"18),"time": datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S")}print(info)# Output: {'user': <__main__.User object at 0x109f2bd70>, 'time': datetime.datetime(2026, 5, 14, 10, 25, 42, 3132)}print(info["user"].name)# Output: RainBomb

字典推导式

主要是使用如下的语法生成字典或筛选数据:

{k: v for k, v in dict.items() if something}

将列表快速转换为字典

name_list = ["张三""李四""王五"]# 下标当做key,名字当做valued = {i: name for i, name in enumerate(name_list)}print(d)# Output: {0: '张三', 1: '李四', 2: '王五'}

利用 if 进行数据筛选

score = {"语文"80"数学"95"英语"60}# 筛选大于80分的科目new_score = {k:v for k, v in score.items() if v > 80}print(new_score)# Output: {'数学': 95}

字典的排序与遍历

排序

对字典的排序可以借助 sorted() 函数:

score = {"语文"80"数学"95"英语"60}# 按成绩升序排序res = sorted(score.items(), key=lambda x: x[1])print(dict(res))# Output: {'英语': 60, '语文': 80, '数学': 95}

💡 注意

  • sorted() 需接收一个序列数据(如 list、tuple)才能正确排序,因此需要先用 items() 取出字典的键值对为元组列表的形式。
  • sorted() 的参数 key 接受一个判断逻辑,此处是传入了一个 lambda 函数,其作用是告知 sorted 使用键值对元组下标为 1 的元素排序,即使用 value 进行排序。

遍历

字典可以使用 for 循环遍历其内容,但要注意,如果使用如下形式,则默认遍历字典的 keys 列表:

score = {"语文"80"数学"95"英语"60}for cls in score:print(cls, end=" ")# Output: 语文 数学 英语

如果要明确遍历 keys、values 或者键值对,则建议在 in 后面明确使用字典的内置函数以获取准确数据:

# 遍历所有的 keyfor key in dict.keys()pass# 遍历所有的 valuefor value in dict.values()pass# 遍历所有的键值对for key, value in dict.items()pass

往期回顾:

剪贴板里到底存了什么?为什么我能把加粗一并复制?

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  1. CONNECT:[ UseTime:0.000653s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000800s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.003412s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.014628s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000708s ]
  6. SELECT * FROM `set` [ RunTime:0.000237s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000632s ]
  8. SELECT * FROM `article` WHERE `id` = 502751 LIMIT 1 [ RunTime:0.005274s ]
  9. UPDATE `article` SET `lasttime` = 1783006405 WHERE `id` = 502751 [ RunTime:0.019017s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000339s ]
  11. SELECT * FROM `article` WHERE `id` < 502751 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000449s ]
  12. SELECT * FROM `article` WHERE `id` > 502751 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.017591s ]
  13. SELECT * FROM `article` WHERE `id` < 502751 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.048322s ]
  14. SELECT * FROM `article` WHERE `id` < 502751 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002089s ]
  15. SELECT * FROM `article` WHERE `id` < 502751 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.094305s ]
0.295658s