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别再浪费内存了:Python __slots__ 机制深入解析

  • 2026-01-10 19:20:23
别再浪费内存了:Python __slots__ 机制深入解析

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Python 对象的灵活性大家都知道,可以随时给对象添加属性:

class User:      pass  u = User()  u.name = "Alice"  u.age = 30

但这种灵活性的代价也很大,每个普通 Python 对象都有个 __dict__ 字典来存储属性,对象一多内存开销就上来了,这时候 __slots__ 就派上用场。

slots 到底在干什么

__slots__ 让你提前声明类会用到哪些属性:

class User:      __slots__ = ["name", "age"]      def __init__(self, name, age):          self.name = name          self.age = age

这样做之后对象就不会再创建 __dict__ 了。属性存储变成静态的,查找和赋值都快了,尤其是创建大量实例时内存占用能降不少。

底层存储机制的差异

普通对象把每个属性当作 __dict__ 里的键值对访问属性就要做哈希查找。而用了 __slots__ 之后每个属性在内存里有个固定位置,访问变成了直接的数组索引操作省掉了字典查找的开销。

说白了就是把 Python 对象存储搞得像 C 的结构体一样紧凑。

内存能省多少

看个对比:

class Normal:      def __init__(self):          self.a = 1          self.b = 2  class Slotted:      __slots__ = ["a", "b"]      def __init__(self):          self.a = 1          self.b = 2

如果要创建几百万个实例,用 __slots__ 的版本能少用 50-70% 的内存。

属性访问快主要是因为:省掉了字典查找、不用算哈希值、也没有额外的内存间接访问,属性访问时间一般能减少 20-40%。

使用限制

__slots__ 也不是完美的,有些限制得注意。

最明显的是不能随便加属性了:

u=User()  u.address="NYC"# ❌ AttributeError

继承的时候也麻烦,子类得定义自己的 __slots__,而且混用带slots和不带slots的类要小心。多重继承更复杂只有slots名不冲突才行。

另外默认不支持弱引用,要用的话得在 __slots__ 里显式加上 __weakref__

什么场景适合用

几个典型场景:处理大数据集时有几百万个对象;科学计算里的轻量数据结构、游戏引擎里的实体和粒子系统等等,总之就是那些对内存和速度敏感的地方。

一些实用技巧

配合类型提示用能让代码更清晰。可以和 @property 装饰器结合,该灵活的地方还是保持灵活。空类直接用 __slots__ = () 把开销降到最低。

总结

__slots__ 就是让你用灵活性换内存效率和更快的属性访问。对于高性能场景来说这是个必须掌握的优化手段。

就算项目暂时不缺内存,理解 __slots__ 本身也很有价值。它能让你明白 Python 对象是怎么存属性的、属性查找为什么有成本、Python 在灵活性和效率之间怎么权衡。

这些知识对系统设计、性能调优、排查问题都有帮助。

作者:Elshad Karimov

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  1. CONNECT:[ UseTime:0.001077s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001345s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000600s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000649s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001338s ]
  6. SELECT * FROM `set` [ RunTime:0.000566s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001412s ]
  8. SELECT * FROM `article` WHERE `id` = 459864 LIMIT 1 [ RunTime:0.000763s ]
  9. UPDATE `article` SET `lasttime` = 1770587023 WHERE `id` = 459864 [ RunTime:0.010859s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000261s ]
  11. SELECT * FROM `article` WHERE `id` < 459864 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000524s ]
  12. SELECT * FROM `article` WHERE `id` > 459864 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.010215s ]
  13. SELECT * FROM `article` WHERE `id` < 459864 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000925s ]
  14. SELECT * FROM `article` WHERE `id` < 459864 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000969s ]
  15. SELECT * FROM `article` WHERE `id` < 459864 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000958s ]
0.175877s