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Python 中深拷贝和浅拷贝有什么区别?

  • 2026-07-02 16:52:01
Python 中深拷贝和浅拷贝有什么区别?

这类 Bug 看日志很烦。

接口明明只改了一个订单的扩展字段,结果缓存里的原始订单也跟着变了。更恶心的是,打印 id() 看第一层对象还真不一样。

像这样:

import copyraw_order = {"order_no""A20260510001","items": [        {"sku""P1001""count"2},        {"sku""P2008""count"1},    ],"tags": ["new_user"]}draft_order = copy.copy(raw_order)draft_order["order_no"] = "A20260510001_TMP"draft_order["items"][0]["count"] = 99draft_order["tags"].append("manual_check")print(raw_order)

输出大概是这样:

{'order_no''A20260510001','items': [{'sku''P1001''count'99}, {'sku''P2008''count'1}],'tags': ['new_user''manual_check']}

第一眼我就不太信这个 copy.copy()

order_no 没变,说明最外层字典确实被复制了一份。

但 items 和 tags 变了,说明里面那几个列表、字典根本没复制,只是引用还指向原来的对象。

这就是浅拷贝。

浅拷贝只复制最外面一层容器。里面装的对象,不管是列表、字典,还是自定义对象,基本都还是原来的引用。

可以直接把地址打出来看:

import copyraw_order = {"items": [{"sku""P1001""count"2}],"tags": ["new_user"]}draft_order = copy.copy(raw_order)print(id(raw_order), id(draft_order))print(id(raw_order["items"]), id(draft_order["items"]))print(id(raw_order["items"][0]), id(draft_order["items"][0]))

第一行不一样,后面两行大概率一样。

这地方很多人容易误判,因为他们只看了最外层对象。

如果数据只有一层,浅拷贝没问题:

origin = {"name""order_job""retry"3}copied = origin.copy()copied["retry"] = 5print(origin)   # {'name': 'order_job', 'retry': 3}print(copied)   # {'name': 'order_job', 'retry': 5}

这种场景用 dict.copy() 就够了,别上来就 deepcopy。我一般看到有人在很大的配置对象上无脑 deepcopy,会多看两眼。不是不能用,是它可能把你不想拷贝的东西也递归扫一遍,性能和行为都容易变得不受控。

深拷贝就是另一套玩法。

它不只复制第一层,还会继续往里面走,把嵌套对象也复制出来:

import copyraw_order = {"order_no""A20260510001","items": [        {"sku""P1001""count"2},        {"sku""P2008""count"1},    ],"tags": ["new_user"]}draft_order = copy.deepcopy(raw_order)draft_order["items"][0]["count"] = 99draft_order["tags"].append("manual_check")print(raw_order)print(draft_order)

这次 raw_order 不会被带着改。

这才是很多业务里想要的“复制一份出来随便改”。

比如导入订单时,先拿原始数据做一份临时草稿,清洗字段、补默认值、打标记,最后再决定要不要入库。这个时候用浅拷贝就很危险,因为你以为自己在改草稿,实际把原始数据污染了。

我现场一般会这么写,不会把清洗逻辑直接怼在原对象上:

import copydefbuild_order_preview(order_payload: dict) -> dict:    preview = copy.deepcopy(order_payload)for line in preview.get("items", []):        line["count"] = int(line.get("count"or0)        line["amount"] = round(line["count"] * float(line.get("price"or0), 2)    preview.setdefault("check_flags", [])ifnot preview.get("receiver_mobile"):        preview["check_flags"].append("missing_mobile")return preview

这里用 deepcopy 是有理由的。

因为 items 是列表,列表里又是字典。后面还要改 count、补 amount。这要是浅拷贝,原始请求参数也会被改掉。后面你再打日志排查,会发现入参日志和用户传过来的数据对不上,能把人绕进去。

不过深拷贝也不是银弹。

有些对象不适合随便深拷贝,比如文件句柄、数据库连接、线程锁、一些客户端对象。业务对象里如果混了这些东西,deepcopy 可能直接报错,也可能复制出一个看着能用但状态很怪的对象。

看个自定义类的例子:

import copyfrom dataclasses import dataclass, field@dataclassclassImportTask:    task_id: str    rows: list[dict]    errors: list[str] = field(default_factory=list)task = ImportTask(    task_id="import_20260510",    rows=[{"line"1"mobile""13800000000"}])task_copy = copy.copy(task)task_deep = copy.deepcopy(task)task_copy.rows[0]["mobile"] = "invalid"task_copy.errors.append("mobile_format_error")print(task.rows)print(task.errors)

这个 task_copy 看着是新对象,实际上 rows 和 errors 还连着原来的。

用在导入任务里就很坑。你本来想复制一个任务出来做预校验,结果错误信息挂回了原任务,后面状态流转就乱了。

如果对象里有些字段你明确不想深拷贝,可以自己控制:

from dataclasses import dataclass, fieldimport copy@dataclassclassPriceCalcContext:    batch_no: str    rules: list[dict]    cache_client: object = None    logs: list[str] = field(default_factory=list)defclone_for_retry(self):return PriceCalcContext(            batch_no=self.batch_no,            rules=copy.deepcopy(self.rules),            cache_client=self.cache_client,            logs=[]        )

这里我只深拷贝 rules,因为重试时规则可能会临时改。

cache_client 不拷贝,继续复用。

logs 直接给新的空列表,避免上一次重试的日志混进来。

这个比无脑 deepcopy(self) 更稳。

平时判断用哪个,我一般就看一句话:后面会不会改嵌套对象。

只改第一层,用浅拷贝。

要改里面的列表、字典、对象,用深拷贝。

对象里混了连接、锁、客户端、上下文句柄,就别偷懒,自己写一个明确的复制方法。

Python 这块最容易坑人的地方,不是 copy.copy 和 copy.deepcopy 名字记不住,而是你以为复制了,其实只复制了壳。

壳换了,里面还是同一套东西。线上很多脏数据,就是这么悄悄写进去的。

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  1. CONNECT:[ UseTime:0.000554s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000965s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000345s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000272s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000638s ]
  6. SELECT * FROM `set` [ RunTime:0.000257s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000743s ]
  8. SELECT * FROM `article` WHERE `id` = 495931 LIMIT 1 [ RunTime:0.005831s ]
  9. UPDATE `article` SET `lasttime` = 1783032278 WHERE `id` = 495931 [ RunTime:0.008636s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000316s ]
  11. SELECT * FROM `article` WHERE `id` < 495931 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000627s ]
  12. SELECT * FROM `article` WHERE `id` > 495931 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000631s ]
  13. SELECT * FROM `article` WHERE `id` < 495931 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.011113s ]
  14. SELECT * FROM `article` WHERE `id` < 495931 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.033686s ]
  15. SELECT * FROM `article` WHERE `id` < 495931 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.020135s ]
0.153713s