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高级的dict与dict运算|Python自学成才(番外篇8)

  • 2026-07-10 03:47:08
高级的dict与dict运算|Python自学成才(番外篇8)

Python自学成才(番外篇8)|高级的dict与dict运算

本篇,我们讲一些有关 dict 的冷门操作,例如使用字典进行运算,或者一些特殊的、自带约束的字典。

字典的解构

字典可以用双星号 ** 进行解构,我们在番外篇4已经讲过了,大家自行取食:

(link)

逻辑运算

字典的合并

这里讲的合并是 Python 3.9+ 版本后,新添加的内容。不同于前面讲到的用函数或者循环的方式,而是借助逻辑运算符 |(或)完成:

d1 = {"a"1"b"2}d2 = {"b"3"c"4}print(d1 | d2)# Output: {'a': 1, 'b': 3, 'c': 4}

同样的,当键重复时,后面的字典中的内容会覆盖前面已有的内容。

提取相同的键

给定两个字典,如何提取出他们 keys 中相同的部分:

  • 最简单的方式,使用虚幻逐个判断,但是比较繁琐,同时循环会增加计算负担。

此时,就可以使用逻辑运算符 &(与)完成:

d1 = {"a"1"b"2}d2 = {"b"3"c"4}res = d1.keys() & d2.keys()print(res, type(res))# Output: {'b'} <class 'set'>

💡 注意:计算结果以 set(集合)的形式返回,如需进行其他操作,需要先进行类型转换。

自带约束的字典

有序字典 OrderedDict

OrderedDict 的作用是确保字典的内容按照插入顺序存储,而不是混乱排列:

from collections import OrderedDictod = OrderedDict()od["name"] = "RainBomb"od["age"] = 18print(dict(od))# Output: {'name': 'RainBomb', 'age': 18}

其在使用上可以利用的特性是其对插入顺序的严格要求,即当两个字典的内容一样,但排列顺序不同时,就会判断两个字典不相等:

from collections import OrderedDictd1, d2 = {}, {}d1["name"] = "RainBomb"d1["age"] = 18d2["age"] = 18d2["name"] = "RainBomb"print(d1)print(d2)# Output: {'name': 'RainBomb', 'age': 18}# Output: {'age': 18, 'name': 'RainBomb'}od1 = OrderedDict(d1)od2 = OrderedDict(d2)print(od1)print(od2)# Output: OrderedDict({'name': 'RainBomb', 'age': 18})# Output: OrderedDict({'age': 18, 'name': 'RainBomb'})print(d1 == d2)# Output: Trueprint(od1 == od2)# Output: False

只读字典 MappingProxyType

对于一些特殊场景,我们创建了字典后,不想在后面的计算中将里面的内容进行修改,于是我们就要对字典添加只读保护,让字典只能被读取里面的数据,不能被修改:

from types import MappingProxyTyped = {"name""RainBomb""age"18}read_d = MappingProxyType(d)print(read_d)# Output: {'name': 'RainBomb', 'age': 18}read_d["age"] = 20# Output: TypeError: 'mappingproxy' object does not support item assignment

往期回顾:

UTF-8、GBK、Unicode 的爱恨情仇

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  1. CONNECT:[ UseTime:0.000486s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000816s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000271s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000291s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000530s ]
  6. SELECT * FROM `set` [ RunTime:0.000225s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000532s ]
  8. SELECT * FROM `article` WHERE `id` = 503894 LIMIT 1 [ RunTime:0.000383s ]
  9. UPDATE `article` SET `lasttime` = 1783697265 WHERE `id` = 503894 [ RunTime:0.017147s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000235s ]
  11. SELECT * FROM `article` WHERE `id` < 503894 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000635s ]
  12. SELECT * FROM `article` WHERE `id` > 503894 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.006275s ]
  13. SELECT * FROM `article` WHERE `id` < 503894 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001725s ]
  14. SELECT * FROM `article` WHERE `id` < 503894 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.006531s ]
  15. SELECT * FROM `article` WHERE `id` < 503894 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.007726s ]
0.120692s