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Python 新增 frozendict

  • 2026-03-23 20:11:03
Python 新增 frozendict

PYTHON 3.15 · PEP 814

 Python 3.15 终于要有内置的 不可变字典 了。 

 PEP 814 刚刚通过,frozendict 将在 Python 3.15 成为内置类型。不需要 import,不需要第三方库,直接用。但这件事的意义远不止"多了一个类型"——它可能是 Python 向"默认不可变"迈出的试探性一步。 

 01  frozendict 是什么 

 一句话:创建后不能修改的字典。键值对一旦写入,就再也改不了、删不掉、加不进。 

 听起来很简单,对吧?但 Python 等了 30 多年才把它做进内置。 

 目前你想用不可变字典,要么用 tuple 嵌套键值对(可读性差),要么用 types.MappingProxyType(名字就劝退),要么装第三方的 frozendict 库。没有一个方案让人满意。 

 注意两个关键特性:可哈希意味着它可以作为另一个字典的 key 或集合的元素;联合操作符让你像合并普通字典一样合并 frozendict。这两个特性组合起来,打开了函数式编程风格的大门。 

 02  为什么不是 tuple 就够了 

 最常见的问题:用 tuple 存键值对不就行了吗?技术上可以,但语义不对。 

 tuple 传达的信息是"一组有序的值",frozendict 传达的是"一组命名的映射"。当你用 tuple 存配置,你数位置才能知道哪个是 host、哪个是 port;用 frozendict,key 就是最好的注释。 

 这不是强迫症,是工程实践。代码被阅读的次数远多于被编写的次数。当一个数据结构能在声明时就表达清楚意图,省下的不是几秒钟的阅读时间,而是减少理解成本带来的 bug。 

 更实际的价值在缓存和配置场景。函数参数缓存(functools.lru_cache)要求参数可哈希——用 dict 不行,用 tuple 又丢失语义。frozendict 完美解决这个问题:既可哈希,又保留键值对的语义。 

核心价值:frozendict 不是为了替代 tuple,而是在"命名键值对 + 不可变"的场景下,提供语义正确的表达方式。 

 03  更深的信号 

 PEP 814 提案中有一个容易被忽略的细节:dict.freeze() 方法也在讨论中。 

 如果 dict.freeze() 通过,你将可以用 d.freeze() 把任何普通字典变成不可变的——就像 str 和 bytes 的关系一样:一个可变,一个不可变,随时转换。 

 这意味着什么?看看 Python 的历史:str 曾经是可变的(Python 1.x),后来变成了不可变;list 是可变的,tuple 一直不可变。现在 dict 是可变的,frozendict 补上了最后一块拼图。 

 再往深处想:如果未来有一天,dict 字面量默认创建的就是 frozendict,需要显式标记才能得到可变字典呢?听起来疯狂,但 Go 的 map 就是引用类型(天然不可变),Rust 的 HashMap 默认不可变——"默认不可变"正在成为现代语言的设计趋势。 

但先别激动。Python 不太可能走那么远。Guido 多次强调 Python 的设计哲学是"实用优于纯粹",强制不可变不符合这个哲学。更现实的预期是:frozendict 作为可选工具存在,鼓励你在需要不可变性的场景主动使用。 

 不过信号本身值得关注:Python 核心团队开始认真对待不可变性了。30 年来第一次,不可变字典从"第三方的妥协方案"变成了"语言的一部分"。 

LAST WORD

 frozendict 入内置,不只是多了一个类型——它是 Python 在 30 年后对"不可变性"的一次正式回应。 

 Python 3.15 还在开发中,最终 API 可能调整。但方向已经明确了。如果你现在的代码里有用 tuple 伪装字典、用 MappingProxyType 包裹配置、或者装了第三方 frozendict 库的场景,可以开始准备迁移了。 

 一个简单的自查:你的代码里有多少 dict 创建后就没再修改过?如果比例超过 30%,frozendict 3.15 正式发布后值得认真考虑。 

 多一个内置类型不重要。重要的是,Python 终于承认:不是所有数据都应该是可变的。 

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  1. CONNECT:[ UseTime:0.001246s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001708s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000704s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000643s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001469s ]
  6. SELECT * FROM `set` [ RunTime:0.000511s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001435s ]
  8. SELECT * FROM `article` WHERE `id` = 482001 LIMIT 1 [ RunTime:0.002942s ]
  9. UPDATE `article` SET `lasttime` = 1774576198 WHERE `id` = 482001 [ RunTime:0.006985s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000630s ]
  11. SELECT * FROM `article` WHERE `id` < 482001 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001148s ]
  12. SELECT * FROM `article` WHERE `id` > 482001 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001240s ]
  13. SELECT * FROM `article` WHERE `id` < 482001 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004534s ]
  14. SELECT * FROM `article` WHERE `id` < 482001 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004325s ]
  15. SELECT * FROM `article` WHERE `id` < 482001 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.006616s ]
0.200650s