类变量和实例变量在内存中是如何存储的?

一、先搞懂两个核心存储容器:__dict__

Python 中,类、每个实例对象各自拥有独立的属性字典 __dict__,所有自定义属性都存在这里。

  • 类变量:存放在 类对象的 __dict__
  • 实例变量:存放在 实例对象的 __dict__

1. 类对象的内存存储

当你定义 class A: 时:

  1. Python 在堆内存中创建一个 type 类型的类对象;
  2. 类中直接定义的变量、类方法、静态方法、装饰器属性,全部存入 A.__dict__
  3. 所有实例不会复制这份字典,只是通过属性查找链引用。

示例:

python

运行

复制代码
class A:
    cls_num = 100

    def func(self):
        pass

print(A.__dict__)
# 包含 'cls_num'、'func' 等类属性

内存结构简图

plaintext

复制代码
堆内存
┌──────────── 类对象 A(type实例) ───────────┐
│ A.__dict__: {'cls_num': 100, 'func': 函数地址...} │
└─────────────────────────────────────────────┘

二、实例对象的内存存储

执行 a = A() 实例化:

  1. 在堆上创建实例对象,分配对象头部信息(引用计数、类型指针等);
  2. 默认创建空的实例属性字典 a.__dict__
  3. 实例初始不会拷贝任何类变量到自己的 __dict__
  4. 通过内部指针 __class__ 指向所属类 A,找不到属性时向上去类的 __dict__ 查找。

python

运行

复制代码
a = A()
print(a.__dict__)  # 初始为空 {}
print(a.__class__ is A)  # True

内存结构简图

plaintext

复制代码
┌──── 实例对象 a ────┐        ┌──── 类对象 A ────┐
│ __class__ → 指向A  │        │ A.__dict__      │
│ a.__dict__ = {}   │◄───────│ cls_num=100     │
└───────────────────┘        └─────────────────┘

三、两种变量详细存储规则

1. 类变量存储规则

  1. 仅存储一份 :无论创建多少个实例,类变量只存在类的 __dict__ 中;
  2. 访问规则:
    • A.cls_num:直接查 A.__dict__
    • a.cls_num:先查 a.__dict__ 没找到,再去 A.__dict__ 查找
  3. 通过类名赋值 :只会修改类 __dict__ 里的值,所有实例可见。

2. 实例变量存储规则

  1. __init__ 中用 self.xxx = 值,属性写入当前实例自己的 __dict__
  2. 每一个实例都有独立的 __dict__,互不干扰;
  3. 只能通过当前实例访问,类无法直接访问实例变量。

python

运行

复制代码
class A:
    cls_var = 10

    def __init__(self):
        self.ins_var = 20  # 存入实例.__dict__

a1 = A()
a2 = A()
print(a1.__dict__)  # {'ins_var':20}
print(a2.__dict__)  # {'ins_var':20} 两个独立字典

内存结构

plaintext

复制代码
实例a1:__dict__ {'ins_var':20}
实例a2:__dict__ {'ins_var':20}
类A:__dict__ {'cls_var':10}

四、高频易错场景:实例赋值同名类变量

python

运行

复制代码
class A:
    num = 10

a = A()
a.num = 99

存储变化:

  1. 不会修改类的 num
  2. 在当前实例 a.__dict__ 中新增键 'num' = 99
  3. 后续 a.num 优先读取实例自己的属性,屏蔽了类变量

内存结构:

plaintext

复制代码
A.__dict__: {'num':10}
a.__dict__: {'num':99}

五、可变类变量(list/dict)的存储特点

python

运行

复制代码
class A:
    lst = [1,2]

a = A()
a.lst.append(3)
  • lst 依然只存在类的 __dict__
  • 所有实例引用同一个列表内存地址
  • 只是修改堆上列表内部数据,没有在实例新建属性,所以全部实例共享变化。

六、slots 对实例存储的改变(优化存储)

默认实例靠 __dict__ 存储属性,开销大; 使用 __slots__ 后:

  1. 实例不再创建 __dict__
  2. 属性固定存在实例结构体的数组中,内存大幅压缩;
  3. 不能动态新增实例属性,只能使用 slots 定义的字段。

python

运行

复制代码
class A:
    __slots__ = ["name"]
    cls_var = 10
    def __init__(self):
        self.name = "test"
# 实例没有 __dict__,属性存在固定内存数组里

七、整体存储总结表

表格

维度 类变量 实例变量
存储位置 类对象的 __dict__ 每个实例各自的 __dict__(或__slots__数组)
内存份数 全局仅 1 份 N 个实例就 N 份独立存储
创建时机 类定义阶段 实例化运行时(一般__init__
属性查找顺序 实例→类 直接当前实例
生命周期 类加载到程序结束 实例创建到被 GC 回收

需要我画一张完整的内存寻址流程图(属性查找 MRO 链路)吗?

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