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看看Python的内存管理(三):对象在内存中的存储

  • 2026-02-14 00:40:26
看看Python的内存管理(三):对象在内存中的存储

在前面的内容中我们已经知道,id() 返回对象的内存地址,那一个Python对象,在内存中到底占用多少字节?这些字节又存储了什么内容?​

先做一个简单的测试,看看整数对象的内存大小:

import sys# 测试小整数的内存大小print(f"{sys.getsizeof(1)=}")  # 输出 28!也就是说,一个整数1,在内存中占用28字节

再测试一下小整数的内存地址间隔:

for i in range(5):    print(f"id({i+1}) - id({i}) = {id(i+1) - id(i)}")  # 输出结果都是32

这里就有两个疑问:为什么一个整数占用28字节,而内存地址的间隔却是32字节?答案很简单:id() 返回的是对象的“起始内存地址”,而Python在分配内存时,会进行内存对齐(通常是8字节对齐),确保内存块的长度是8的整数倍,提升内存访问效率。

结合CPython的官方文档,我们可以拆解出一个整数对象(小整数)的28字节内存结构(剩余4字节用于内存对齐,凑够32字节):

8字节:引用计数(对于不朽对象,这里存储的是 0xc0000000 这样的标志);​8字节:类型指针(指向该对象的类型,比如整数对象的类型是 int);​8字节:大小字段(Python的整数可以是任意长度,这个字段用来记录整数的位数);​4字节:实际的数字(如果是大整数,会额外分配内存存储更多数字);​4字节:内存对齐(凑够32字节,满足8字节对齐要求)。

在CPython的C语言底层,所有Python对象都继承自一个基础结构体——PyObject,它是Python对象的“基类”,定义了所有对象都必须具备的两个核心字段:

typedef struct _object {    Py_ssize_t ob_refcnt;    // 引用计数(或不朽对象标志)    PyTypeObject *ob_type;   // 类型指针,指向对象的类型} PyObject;

而整数对象(在C底层叫做“长整数”),则是在 PyObject 的基础上,扩展了自己的字段:

// 整数对象的数值部分typedef struct _PyLongValue {    uintptr_t lv_tag; /* 数字的位数、符号和标志 */    digit ob_digit[1]; /* 整数的实际数值,是一个32位整数数组 */} _PyLongValue;// 整数对象的完整结构struct _longobject { /* C层面,Python的int叫做long integer */    PyObject_HEAD /* 继承PyObject的两个字段 */    _PyLongValue long_value; /* 整数的数值部分 */};

其中,PyObject_HEAD 就是对 PyObject 结构体的引用,是Python内存管理器用来检索、回收对象的核心依据。​

了解这些底层结构,不需要我们会写C代码,只要能明白:Python的每一个对象,都有一个基础的“头部”(存储引用计数和类型),再加上自己的“数据部分”(存储实际值),这就够了。

看到这里,大家可能会觉得:引用计数已经能完美管理内存了——引用为0就回收,简单又高效。​但实际上,引用计数有一个致命的“短板”:无法处理循环引用。​比如两个对象,互相引用对方,即使没有其他任何引用指向它们,它们的引用计数也永远不会降到0,内存就会被一直占用,导致内存泄漏。

说到循环引用,那是我们下次要看的内容。

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  1. CONNECT:[ UseTime:0.000476s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000752s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000297s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000255s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000501s ]
  6. SELECT * FROM `set` [ RunTime:0.000197s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000580s ]
  8. SELECT * FROM `article` WHERE `id` = 475167 LIMIT 1 [ RunTime:0.000340s ]
  9. UPDATE `article` SET `lasttime` = 1771373772 WHERE `id` = 475167 [ RunTime:0.005310s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000235s ]
  11. SELECT * FROM `article` WHERE `id` < 475167 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000418s ]
  12. SELECT * FROM `article` WHERE `id` > 475167 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000867s ]
  13. SELECT * FROM `article` WHERE `id` < 475167 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000889s ]
  14. SELECT * FROM `article` WHERE `id` < 475167 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001819s ]
  15. SELECT * FROM `article` WHERE `id` < 475167 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003124s ]
0.097895s