{"id":1157520,"date":"2025-01-13T18:29:38","date_gmt":"2025-01-13T10:29:38","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/1157520.html"},"modified":"2025-01-13T18:29:41","modified_gmt":"2025-01-13T10:29:41","slug":"python%e6%b7%b1%e6%8b%b7%e8%b4%9d%e5%a6%82%e4%bd%95%e5%ae%9e%e7%8e%b0","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/1157520.html","title":{"rendered":"python\u6df1\u62f7\u8d1d\u5982\u4f55\u5b9e\u73b0"},"content":{"rendered":"

\"python\u6df1\u62f7\u8d1d\u5982\u4f55\u5b9e\u73b0\"<\/p>\n

Python\u4e2d\u6df1\u62f7\u8d1d\u53ef\u4ee5\u901a\u8fc7copy<\/code>\u6a21\u5757\u4e2d\u7684deepcopy<\/code>\u51fd\u6570\u5b9e\u73b0\u3001\u6df1\u62f7\u8d1d\u4f1a\u9012\u5f52\u5730\u590d\u5236\u5bf9\u8c61\u53ca\u5176\u5305\u542b\u7684\u5bf9\u8c61\u3001\u4e0e\u6d45\u62f7\u8d1d\u4e0d\u540c\u7684\u662f\uff0c\u6df1\u62f7\u8d1d\u4f1a\u521b\u5efa\u4e00\u4e2a\u5168\u65b0\u7684\u5bf9\u8c61\u53ca\u5176\u5305\u542b\u7684\u5bf9\u8c61\uff0c\u4e0d\u4f1a\u5171\u4eab\u5185\u5b58\u5730\u5740<\/strong>\u3002\u5176\u4e2d\uff0c\u9012\u5f52\u590d\u5236\u6574\u4e2a\u5bf9\u8c61\u6811\u662f\u6df1\u62f7\u8d1d\u7684\u6838\u5fc3\uff0c\u8fd9\u4f7f\u5f97\u6df1\u62f7\u8d1d\u5728\u5904\u7406\u590d\u6742\u6570\u636e\u7ed3\u6784\u65f6\u5c24\u4e3a\u91cd\u8981\u3002<\/p>\n<\/p>\n

\u5728Python\u4e2d\uff0c\u6df1\u62f7\u8d1d\u662f\u4e00\u79cd\u91cd\u8981\u7684\u64cd\u4f5c\uff0c\u5c24\u5176\u662f\u5728\u5904\u7406\u590d\u6742\u6570\u636e\u7ed3\u6784\uff08\u5982\u5d4c\u5957\u5217\u8868\u3001\u5b57\u5178\u7b49\uff09\u65f6\u3002\u5f53\u6211\u4eec\u9700\u8981\u521b\u5efa\u4e00\u4e2a\u5b8c\u5168\u72ec\u7acb\u7684\u526f\u672c\uff0c\u4ee5\u907f\u514d\u5bf9\u539f\u59cb\u6570\u636e\u7684\u4fee\u6539\u5f71\u54cd\u5230\u526f\u672c\u65f6\uff0c\u6df1\u62f7\u8d1d\u663e\u5f97\u5c24\u4e3a\u91cd\u8981\u3002\u4e0b\u9762\u5c06\u8be6\u7ec6\u4ecb\u7ecd\u5982\u4f55\u5728Python\u4e2d\u5b9e\u73b0\u6df1\u62f7\u8d1d\uff0c\u5e76\u63a2\u8ba8\u5176\u5e94\u7528\u573a\u666f\u53ca\u6ce8\u610f\u4e8b\u9879\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u6df1\u62f7\u8d1d\u7684\u57fa\u672c\u6982\u5ff5<\/h3>\n<\/p>\n

\u6df1\u62f7\u8d1d\u4e0e\u6d45\u62f7\u8d1d\u7684\u4e3b\u8981\u533a\u522b\u5728\u4e8e\u662f\u5426\u9012\u5f52\u5730\u590d\u5236\u5bf9\u8c61\u53ca\u5176\u5305\u542b\u7684\u5bf9\u8c61<\/strong>\u3002\u6d45\u62f7\u8d1d\u4ec5\u590d\u5236\u5bf9\u8c61\u672c\u8eab\uff0c\u800c\u4e0d\u590d\u5236\u5176\u5305\u542b\u7684\u5bf9\u8c61\u3002\u8fd9\u610f\u5473\u7740\uff0c\u5982\u679c\u539f\u59cb\u5bf9\u8c61\u5305\u542b\u5176\u4ed6\u5bf9\u8c61\uff0c\u6d45\u62f7\u8d1d\u540e\u7684\u5bf9\u8c61\u4f1a\u4e0e\u539f\u59cb\u5bf9\u8c61\u5171\u4eab\u8fd9\u4e9b\u5305\u542b\u7684\u5bf9\u8c61\u3002\u800c\u6df1\u62f7\u8d1d\u5219\u4f1a\u9012\u5f52\u5730\u590d\u5236\u6240\u6709\u5305\u542b\u7684\u5bf9\u8c61\uff0c\u521b\u5efa\u4e00\u4e2a\u5b8c\u5168\u72ec\u7acb\u7684\u526f\u672c\u3002<\/p>\n<\/p>\n

1. \u6d45\u62f7\u8d1d<\/h4>\n<\/p>\n

\u6d45\u62f7\u8d1d\u53ef\u4ee5\u4f7f\u7528copy<\/code>\u6a21\u5757\u4e2d\u7684copy<\/code>\u51fd\u6570\u6216\u5bf9\u8c61\u7684\u5185\u7f6e\u65b9\u6cd5__copy__<\/code>\u6765\u5b9e\u73b0\u3002\u6d45\u62f7\u8d1d\u4ec5\u590d\u5236\u5bf9\u8c61\u7684\u9876\u5c42\u7ed3\u6784\uff0c\u800c\u4e0d\u4f1a\u590d\u5236\u5176\u5305\u542b\u7684\u5bf9\u8c61\u3002<\/p>\n<\/p>\n

import copy<\/p>\n
original_list = [1, 2, [3, 4]]<\/p>\n
shallow_copy = copy.copy(original_list)<\/p>\n
print(shallow_copy)<\/p>\n
print(shallow_copy is original_list)<\/p>\n
print(shallow_copy[2] is original_list[2])<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e0a\u9762\u7684\u4ee3\u7801\u4f1a\u8f93\u51fa\uff1a<\/p>\n<\/p>\n
[1, 2, [3, 4]]<\/p>\n
False<\/p>\n
True<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u53ef\u4ee5\u770b\u51fa\uff0c\u6d45\u62f7\u8d1d\u540e\u7684\u5217\u8868\u4e0e\u539f\u59cb\u5217\u8868\u4e0d\u662f\u540c\u4e00\u4e2a\u5bf9\u8c61\uff0c\u4f46\u5b83\u4eec\u7684\u5d4c\u5957\u5217\u8868\u662f\u5171\u4eab\u7684\u3002<\/p>\n<\/p>\n
2. \u6df1\u62f7\u8d1d<\/h4>\n<\/p>\n
\u6df1\u62f7\u8d1d\u53ef\u4ee5\u4f7f\u7528copy<\/code>\u6a21\u5757\u4e2d\u7684deepcopy<\/code>\u51fd\u6570\u6765\u5b9e\u73b0\u3002\u6df1\u62f7\u8d1d\u4f1a\u9012\u5f52\u5730\u590d\u5236\u5bf9\u8c61\u53ca\u5176\u5305\u542b\u7684\u6240\u6709\u5bf9\u8c61\u3002<\/p>\n<\/p>\n
import copy<\/p>\n
original_list = [1, 2, [3, 4]]<\/p>\n
deep_copy = copy.deepcopy(original_list)<\/p>\n
print(deep_copy)<\/p>\n
print(deep_copy is original_list)<\/p>\n
print(deep_copy[2] is original_list[2])<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e0a\u9762\u7684\u4ee3\u7801\u4f1a\u8f93\u51fa\uff1a<\/p>\n<\/p>\n
[1, 2, [3, 4]]<\/p>\n
False<\/p>\n
False<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u53ef\u4ee5\u770b\u51fa\uff0c\u6df1\u62f7\u8d1d\u540e\u7684\u5217\u8868\u4e0e\u539f\u59cb\u5217\u8868\u53ca\u5176\u5305\u542b\u7684\u5d4c\u5957\u5217\u8868\u90fd\u4e0d\u662f\u540c\u4e00\u4e2a\u5bf9\u8c61\uff0c\u5b8c\u5168\u72ec\u7acb\u3002<\/p>\n<\/p>\n
\u4e8c\u3001\u6df1\u62f7\u8d1d\u7684\u5b9e\u73b0<\/h3>\n<\/p>\n
1. \u4f7f\u7528copy<\/code>\u6a21\u5757\u7684deepcopy<\/code>\u51fd\u6570<\/h4>\n<\/p>\n
Python\u6807\u51c6\u5e93\u4e2d\u7684copy<\/code>\u6a21\u5757\u63d0\u4f9b\u4e86deepcopy<\/code>\u51fd\u6570\uff0c\u7528\u4e8e\u5b9e\u73b0\u6df1\u62f7\u8d1d\u3002deepcopy<\/code>\u51fd\u6570\u4f1a\u9012\u5f52\u5730\u590d\u5236\u5bf9\u8c61\u53ca\u5176\u5305\u542b\u7684\u6240\u6709\u5bf9\u8c61\uff0c\u786e\u4fdd\u539f\u59cb\u5bf9\u8c61\u548c\u526f\u672c\u4e4b\u95f4\u6ca1\u6709\u4efb\u4f55\u5171\u4eab\u7684\u5b50\u5bf9\u8c61\u3002<\/p>\n<\/p>\n
import copy<\/p>\n
original_dict = {'a': 1, 'b': [2, 3, 4]}<\/p>\n
deep_copy_dict = copy.deepcopy(original_dict)<\/p>\n
print(deep_copy_dict)<\/p>\n
print(deep_copy_dict is original_dict)<\/p>\n
print(deep_copy_dict['b'] is original_dict['b'])<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e0a\u9762\u7684\u4ee3\u7801\u4f1a\u8f93\u51fa\uff1a<\/p>\n<\/p>\n
{'a': 1, 'b': [2, 3, 4]}<\/p>\n
False<\/p>\n
False<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u53ef\u4ee5\u770b\u51fa\uff0c\u6df1\u62f7\u8d1d\u540e\u7684\u5b57\u5178\u4e0e\u539f\u59cb\u5b57\u5178\u53ca\u5176\u5305\u542b\u7684\u5217\u8868\u90fd\u4e0d\u662f\u540c\u4e00\u4e2a\u5bf9\u8c61\uff0c\u5b8c\u5168\u72ec\u7acb\u3002<\/p>\n<\/p>\n
2. \u6df1\u62f7\u8d1d\u7684\u5b9e\u73b0\u539f\u7406<\/h4>\n<\/p>\n
\u6df1\u62f7\u8d1d\u7684\u5b9e\u73b0\u539f\u7406\u662f\u9012\u5f52\u5730\u590d\u5236\u5bf9\u8c61\u53ca\u5176\u5305\u542b\u7684\u6240\u6709\u5bf9\u8c61\u3002\u4e3a\u4e86\u907f\u514d\u91cd\u590d\u62f7\u8d1d\u548c\u5faa\u73af\u5f15\u7528\uff0cdeepcopy<\/code>\u51fd\u6570\u4f1a\u7ef4\u62a4\u4e00\u4e2a\u5df2\u62f7\u8d1d\u5bf9\u8c61\u7684\u5b57\u5178\u3002\u5f53\u9047\u5230\u5df2\u7ecf\u62f7\u8d1d\u8fc7\u7684\u5bf9\u8c61\u65f6\uff0c\u76f4\u63a5\u8fd4\u56de\u5176\u526f\u672c\u3002<\/p>\n<\/p>\n
import copy<\/p>\n
class Node:<\/p>\n
    def __init__(self, value):<\/p>\n
        self.value = value<\/p>\n
        self.next = None<\/p>\n
node1 = Node(1)<\/p>\n
node2 = Node(2)<\/p>\n
node1.next = node2<\/p>\n
node2.next = node1  # \u521b\u5efa\u5faa\u73af\u5f15\u7528<\/p>\n
deep_copy_node1 = copy.deepcopy(node1)<\/p>\n
print(deep_copy_node1 is node1)<\/p>\n
print(deep_copy_node1.next is node2)<\/p>\n
print(deep_copy_node1.next.next is node1)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e0a\u9762\u7684\u4ee3\u7801\u4f1a\u8f93\u51fa\uff1a<\/p>\n<\/p>\n
False<\/p>\n
False<\/p>\n
False<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u53ef\u4ee5\u770b\u51fa\uff0c\u6df1\u62f7\u8d1d\u540e\u7684\u8282\u70b9\u4e0e\u539f\u59cb\u8282\u70b9\u53ca\u5176\u5305\u542b\u7684\u8282\u70b9\u90fd\u4e0d\u662f\u540c\u4e00\u4e2a\u5bf9\u8c61\uff0c\u5b8c\u5168\u72ec\u7acb\uff0c\u5373\u4f7f\u5b58\u5728\u5faa\u73af\u5f15\u7528\u4e5f\u80fd\u6b63\u786e\u5904\u7406\u3002<\/p>\n<\/p>\n
\u4e09\u3001\u6df1\u62f7\u8d1d\u7684\u5e94\u7528\u573a\u666f<\/h3>\n<\/p>\n
\u6df1\u62f7\u8d1d\u5728\u5904\u7406\u590d\u6742\u6570\u636e\u7ed3\u6784\u65f6\u5c24\u4e3a\u91cd\u8981\uff0c\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u89c1\u7684\u5e94\u7528\u573a\u666f\uff1a<\/p>\n<\/p>\n
1. \u5904\u7406\u5d4c\u5957\u7684\u6570\u636e\u7ed3\u6784<\/h4>\n<\/p>\n
\u5f53\u6211\u4eec\u9700\u8981\u590d\u5236\u5d4c\u5957\u7684\u6570\u636e\u7ed3\u6784\uff08\u5982\u5d4c\u5957\u5217\u8868\u3001\u5b57\u5178\u7b49\uff09\u65f6\uff0c\u6df1\u62f7\u8d1d\u53ef\u4ee5\u786e\u4fdd\u6240\u6709\u5c42\u7ea7\u7684\u5bf9\u8c61\u90fd\u88ab\u590d\u5236\uff0c\u907f\u514d\u5171\u4eab\u5185\u5b58\u5730\u5740\u5bfc\u81f4\u7684\u526f\u4f5c\u7528\u3002<\/p>\n<\/p>\n
import copy<\/p>\n
nested_list = [[1, 2], [3, 4]]<\/p>\n
deep_copy_list = copy.deepcopy(nested_list)<\/p>\n
deep_copy_list[0][0] = 99<\/p>\n
print(nested_list)<\/p>\n
print(deep_copy_list)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e0a\u9762\u7684\u4ee3\u7801\u4f1a\u8f93\u51fa\uff1a<\/p>\n<\/p>\n
[[1, 2], [3, 4]]<\/p>\n
[[99, 2], [3, 4]]<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u53ef\u4ee5\u770b\u51fa\uff0c\u4fee\u6539\u6df1\u62f7\u8d1d\u540e\u7684\u5217\u8868\u4e0d\u4f1a\u5f71\u54cd\u539f\u59cb\u5217\u8868\uff0c\u786e\u4fdd\u6570\u636e\u72ec\u7acb\u3002<\/p>\n<\/p>\n
2. \u907f\u514d\u526f\u4f5c\u7528<\/h4>\n<\/p>\n
\u5728\u51fd\u6570\u8c03\u7528\u4e2d\uff0c\u5982\u679c\u6211\u4eec\u9700\u8981\u4f20\u9012\u4e00\u4e2a\u53ef\u53d8\u5bf9\u8c61\uff08\u5982\u5217\u8868\u3001\u5b57\u5178\u7b49\uff09\uff0c\u5e76\u4e14\u4e0d\u5e0c\u671b\u51fd\u6570\u5185\u90e8\u7684\u4fee\u6539\u5f71\u54cd\u539f\u59cb\u5bf9\u8c61\uff0c\u53ef\u4ee5\u4f7f\u7528\u6df1\u62f7\u8d1d\u3002<\/p>\n<\/p>\n
import copy<\/p>\n
def modify_list(lst):<\/p>\n
    deep_copy_lst = copy.deepcopy(lst)<\/p>\n
    deep_copy_lst.append(99)<\/p>\n
    return deep_copy_lst<\/p>\n
original_list = [1, 2, 3]<\/p>\n
modified_list = modify_list(original_list)<\/p>\n
print(original_list)<\/p>\n
print(modified_list)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e0a\u9762\u7684\u4ee3\u7801\u4f1a\u8f93\u51fa\uff1a<\/p>\n<\/p>\n
[1, 2, 3]<\/p>\n
[1, 2, 3, 99]<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u53ef\u4ee5\u770b\u51fa\uff0c\u51fd\u6570\u5185\u90e8\u5bf9\u6df1\u62f7\u8d1d\u540e\u7684\u5217\u8868\u7684\u4fee\u6539\u4e0d\u4f1a\u5f71\u54cd\u539f\u59cb\u5217\u8868\uff0c\u907f\u514d\u4e86\u526f\u4f5c\u7528\u3002<\/p>\n<\/p>\n
3. \u5904\u7406\u5faa\u73af\u5f15\u7528<\/h4>\n<\/p>\n
\u5f53\u5bf9\u8c61\u4e4b\u95f4\u5b58\u5728\u5faa\u73af\u5f15\u7528\u65f6\uff0c\u6df1\u62f7\u8d1d\u53ef\u4ee5\u6b63\u786e\u5904\u7406\u8fd9\u4e9b\u5f15\u7528\uff0c\u786e\u4fdd\u526f\u672c\u4e2d\u7684\u5f15\u7528\u5173\u7cfb\u4e0e\u539f\u59cb\u5bf9\u8c61\u4e00\u81f4\u3002<\/p>\n<\/p>\n
import copy<\/p>\n
class Node:<\/p>\n
    def __init__(self, value):<\/p>\n
        self.value = value<\/p>\n
        self.next = None<\/p>\n
node1 = Node(1)<\/p>\n
node2 = Node(2)<\/p>\n
node1.next = node2<\/p>\n
node2.next = node1  # \u521b\u5efa\u5faa\u73af\u5f15\u7528<\/p>\n
deep_copy_node1 = copy.deepcopy(node1)<\/p>\n
print(deep_copy_node1 is node1)<\/p>\n
print(deep_copy_node1.next is node2)<\/p>\n
print(deep_copy_node1.next.next is node1)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e0a\u9762\u7684\u4ee3\u7801\u4f1a\u8f93\u51fa\uff1a<\/p>\n<\/p>\n
False<\/p>\n
False<\/p>\n
False<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u53ef\u4ee5\u770b\u51fa\uff0c\u6df1\u62f7\u8d1d\u540e\u7684\u8282\u70b9\u4e0e\u539f\u59cb\u8282\u70b9\u53ca\u5176\u5305\u542b\u7684\u8282\u70b9\u90fd\u4e0d\u662f\u540c\u4e00\u4e2a\u5bf9\u8c61\uff0c\u5faa\u73af\u5f15\u7528\u4e5f\u5f97\u5230\u4e86\u6b63\u786e\u5904\u7406\u3002<\/p>\n<\/p>\n
\u56db\u3001\u6df1\u62f7\u8d1d\u7684\u6ce8\u610f\u4e8b\u9879<\/h3>\n<\/p>\n
\u867d\u7136\u6df1\u62f7\u8d1d\u5728\u5f88\u591a\u573a\u666f\u4e0b\u90fd\u975e\u5e38\u6709\u7528\uff0c\u4f46\u4e5f\u6709\u4e00\u4e9b\u9700\u8981\u6ce8\u610f\u7684\u4e8b\u9879\uff1a<\/p>\n<\/p>\n
1. \u6027\u80fd\u5f00\u9500<\/h4>\n<\/p>\n
\u6df1\u62f7\u8d1d\u4f1a\u9012\u5f52\u5730\u590d\u5236\u5bf9\u8c61\u53ca\u5176\u5305\u542b\u7684\u6240\u6709\u5bf9\u8c61\uff0c\u56e0\u6b64\u5728\u5904\u7406\u5927\u578b\u6570\u636e\u7ed3\u6784\u65f6\uff0c\u53ef\u80fd\u4f1a\u5e26\u6765\u8f83\u5927\u7684\u6027\u80fd\u5f00\u9500\u3002\u6211\u4eec\u9700\u8981\u6743\u8861\u6df1\u62f7\u8d1d\u7684\u5fc5\u8981\u6027\u548c\u6027\u80fd\u5f71\u54cd\uff0c\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u6df1\u62f7\u8d1d\u64cd\u4f5c\u3002<\/p>\n<\/p>\n
import copy<\/p>\n
import time<\/p>\n
large_list = [[i for i in range(1000)] for _ in range(1000)]<\/p>\n
start_time = time.time()<\/p>\n
deep_copy_list = copy.deepcopy(large_list)<\/p>\n
end_time = time.time()<\/p>\n
print(f"Deep copy took {end_time - start_time:.5f} seconds")<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e0a\u9762\u7684\u4ee3\u7801\u4f1a\u8f93\u51fa\u6df1\u62f7\u8d1d\u64cd\u4f5c\u6240\u82b1\u8d39\u7684\u65f6\u95f4\uff0c\u53ef\u4ee5\u770b\u5230\u6df1\u62f7\u8d1d\u5927\u578b\u6570\u636e\u7ed3\u6784\u65f6\u7684\u6027\u80fd\u5f00\u9500\u3002<\/p>\n<\/p>\n
2. \u81ea\u5b9a\u4e49\u5bf9\u8c61\u7684\u6df1\u62f7\u8d1d<\/h4>\n<\/p>\n
\u5bf9\u4e8e\u81ea\u5b9a\u4e49\u7c7b\u5bf9\u8c61\uff0c\u5982\u679c\u9700\u8981\u5b9e\u73b0\u6df1\u62f7\u8d1d\uff0c\u53ef\u80fd\u9700\u8981\u5728\u7c7b\u4e2d\u5b9a\u4e49__deepcopy__<\/code>\u65b9\u6cd5\uff0c\u4ee5\u786e\u4fdd\u5bf9\u8c61\u7684\u6df1\u62f7\u8d1d\u884c\u4e3a\u7b26\u5408\u9884\u671f\u3002<\/p>\n<\/p>\n
import copy<\/p>\n
class MyClass:<\/p>\n
    def __init__(self, value):<\/p>\n
        self.value = value<\/p>\n
    def __deepcopy__(self, memo):<\/p>\n
        print("Deepcopying MyClass")<\/p>\n
        new_obj = type(self)(self.value)<\/p>\n
        memo[id(self)] = new_obj<\/p>\n
        return new_obj<\/p>\n
obj = MyClass(42)<\/p>\n
deep_copy_obj = copy.deepcopy(obj)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\uff0c\u81ea\u5b9a\u4e49\u7c7b\u5b9e\u73b0\u4e86__deepcopy__<\/code>\u65b9\u6cd5\uff0c\u786e\u4fdd\u5728\u6df1\u62f7\u8d1d\u65f6\u8f93\u51fa\u63d0\u793a\u4fe1\u606f\uff0c\u5e76\u6b63\u786e\u590d\u5236\u5bf9\u8c61\u3002<\/p>\n<\/p>\n
3. \u7279\u6b8a\u5bf9\u8c61\u7684\u5904\u7406<\/h4>\n<\/p>\n
\u5bf9\u4e8e\u67d0\u4e9b\u7279\u6b8a\u5bf9\u8c61\uff08\u5982\u6587\u4ef6\u5bf9\u8c61\u3001\u6570\u636e\u5e93\u8fde\u63a5\u7b49\uff09\uff0c\u6df1\u62f7\u8d1d\u53ef\u80fd\u65e0\u6cd5\u6b63\u786e\u5904\u7406\u3002\u8fd9\u4e9b\u5bf9\u8c61\u901a\u5e38\u4e0d\u80fd\u88ab\u7b80\u5355\u5730\u590d\u5236\uff0c\u53ef\u80fd\u9700\u8981\u81ea\u5b9a\u4e49\u903b\u8f91\u6765\u5904\u7406\u5176\u6df1\u62f7\u8d1d\u3002<\/p>\n<\/p>\n
import copy<\/p>\n
class FileWrapper:<\/p>\n
    def __init__(self, file_path):<\/p>\n
        self.file = open(file_path, 'r')<\/p>\n
    def __deepcopy__(self, memo):<\/p>\n
        rAI<\/a>se NotImplementedError("Cannot deepcopy FileWrapper objects")<\/p>\n
file_wrapper = FileWrapper('example.txt')<\/p>\n
try:<\/p>\n
    deep_copy_file_wrapper = copy.deepcopy(file_wrapper)<\/p>\n
except NotImplementedError as e:<\/p>\n
    print(e)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e0a\u9762\u7684\u4ee3\u7801\u4e2d\uff0c\u81ea\u5b9a\u4e49\u7c7bFileWrapper<\/code>\u5728__deepcopy__<\/code>\u65b9\u6cd5\u4e2d\u629b\u51fa\u5f02\u5e38\uff0c\u8868\u793a\u65e0\u6cd5\u6df1\u62f7\u8d1d\u6587\u4ef6\u5bf9\u8c61\u3002<\/p>\n<\/p>\n
\u4e94\u3001\u6df1\u62f7\u8d1d\u7684\u66ff\u4ee3\u65b9\u6848<\/h3>\n<\/p>\n
\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u53ef\u80fd\u4e0d\u9700\u8981\u5b8c\u5168\u72ec\u7acb\u7684\u526f\u672c\uff0c\u800c\u53ef\u4ee5\u4f7f\u7528\u5176\u4ed6\u65b9\u5f0f\u6765\u907f\u514d\u4fee\u6539\u539f\u59cb\u5bf9\u8c61\u7684\u526f\u4f5c\u7528\u3002<\/p>\n<\/p>\n
1. \u4e0d\u53ef\u53d8\u5bf9\u8c61<\/h4>\n<\/p>\n
\u4e0d\u53ef\u53d8\u5bf9\u8c61\uff08\u5982\u5143\u7ec4\u3001\u5b57\u7b26\u4e32\u7b49\uff09\u5728\u521b\u5efa\u540e\u65e0\u6cd5\u4fee\u6539\uff0c\u56e0\u6b64\u4e0d\u9700\u8981\u6df1\u62f7\u8d1d\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u4e0d\u53ef\u53d8\u5bf9\u8c61\u6765\u907f\u514d\u526f\u4f5c\u7528\u3002<\/p>\n<\/p>\n
original_tuple = (1, 2, 3)<\/p>\n
copy_tuple = original_tuple<\/p>\n
print(original_tuple is copy_tuple)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e0a\u9762\u7684\u4ee3\u7801\u4f1a\u8f93\u51fa\uff1a<\/p>\n<\/p>\n
True<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u53ef\u4ee5\u770b\u51fa\uff0c\u4e0d\u53ef\u53d8\u5bf9\u8c61\u4e0d\u9700\u8981\u6df1\u62f7\u8d1d\uff0c\u56e0\u4e3a\u5b83\u4eec\u65e0\u6cd5\u4fee\u6539\uff0c\u4e0d\u4f1a\u4ea7\u751f\u526f\u4f5c\u7528\u3002<\/p>\n<\/p>\n
2. \u51fd\u6570\u5f0f\u7f16\u7a0b<\/h4>\n<\/p>\n
\u51fd\u6570\u5f0f\u7f16\u7a0b\u9f13\u52b1\u4f7f\u7528\u7eaf\u51fd\u6570\u548c\u4e0d\u53ef\u53d8\u6570\u636e\u7ed3\u6784\uff0c\u4ee5\u907f\u514d\u526f\u4f5c\u7528\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u51fd\u6570\u5f0f\u7f16\u7a0b\u6765\u907f\u514d\u6df1\u62f7\u8d1d\u7684\u9700\u6c42\u3002<\/p>\n<\/p>\n
def modify_tuple(tpl):<\/p>\n
    return tpl + (99,)<\/p>\n
original_tuple = (1, 2, 3)<\/p>\n
modified_tuple = modify_tuple(original_tuple)<\/p>\n
print(original_tuple)<\/p>\n
print(modified_tuple)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e0a\u9762\u7684\u4ee3\u7801\u4f1a\u8f93\u51fa\uff1a<\/p>\n<\/p>\n
(1, 2, 3)<\/p>\n
(1, 2, 3, 99)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u53ef\u4ee5\u770b\u51fa\uff0c\u51fd\u6570\u5f0f\u7f16\u7a0b\u901a\u8fc7\u8fd4\u56de\u65b0\u7684\u5143\u7ec4\u6765\u907f\u514d\u4fee\u6539\u539f\u59cb\u5143\u7ec4\uff0c\u907f\u514d\u4e86\u526f\u4f5c\u7528\u3002<\/p>\n<\/p>\n
3. \u4f7f\u7528\u6d45\u62f7\u8d1d\u548c\u624b\u52a8\u590d\u5236<\/h4>\n<\/p>\n
\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u6d45\u62f7\u8d1d\u548c\u624b\u52a8\u590d\u5236\u6765\u5b9e\u73b0\u6df1\u62f7\u8d1d\u7684\u6548\u679c\u3002\u5bf9\u4e8e\u7b80\u5355\u7684\u6570\u636e\u7ed3\u6784\uff0c\u8fd9\u53ef\u80fd\u6bd4\u6df1\u62f7\u8d1d\u66f4\u9ad8\u6548\u3002<\/p>\n<\/p>\n
import copy<\/p>\n
original_list = [[1, 2], [3, 4]]<\/p>\n
shallow_copy_list = copy.copy(original_list)<\/p>\n
for i in range(len(shallow_copy_list)):<\/p>\n
    shallow_copy_list[i] = list(shallow_copy_list[i])<\/p>\n
shallow_copy_list[0][0] = 99<\/p>\n
print(original_list)<\/p>\n
print(shallow_copy_list)<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e0a\u9762\u7684\u4ee3\u7801\u4f1a\u8f93\u51fa\uff1a<\/p>\n<\/p>\n
[[1, 2], [3, 4]]<\/p>\n
[[99, 2], [3, 4]]<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u53ef\u4ee5\u770b\u51fa\uff0c\u901a\u8fc7\u6d45\u62f7\u8d1d\u548c\u624b\u52a8\u590d\u5236\uff0c\u6211\u4eec\u53ef\u4ee5\u5b9e\u73b0\u6df1\u62f7\u8d1d\u7684\u6548\u679c\uff0c\u540c\u65f6\u907f\u514d\u4e86\u6df1\u62f7\u8d1d\u7684\u6027\u80fd\u5f00\u9500\u3002<\/p>\n<\/p>\n
\u516d\u3001\u603b\u7ed3<\/h3>\n<\/p>\n
\u6df1\u62f7\u8d1d\u5728Python\u4e2d\u662f\u4e00\u4e2a\u975e\u5e38\u91cd\u8981\u7684\u64cd\u4f5c\uff0c\u5c24\u5176\u662f\u5728\u5904\u7406\u590d\u6742\u6570\u636e\u7ed3\u6784\u65f6\u3002\u901a\u8fc7\u4f7f\u7528copy<\/code>\u6a21\u5757\u4e2d\u7684deepcopy<\/code>\u51fd\u6570\uff0c\u6211\u4eec\u53ef\u4ee5\u9012\u5f52\u5730\u590d\u5236\u5bf9\u8c61\u53ca\u5176\u5305\u542b\u7684\u6240\u6709\u5bf9\u8c61\uff0c\u786e\u4fdd\u539f\u59cb\u5bf9\u8c61\u548c\u526f\u672c\u4e4b\u95f4\u6ca1\u6709\u4efb\u4f55\u5171\u4eab\u7684\u5b50\u5bf9\u8c61\u3002\u6df1\u62f7\u8d1d\u5728\u5904\u7406\u5d4c\u5957\u6570\u636e\u7ed3\u6784\u3001\u907f\u514d\u526f\u4f5c\u7528\u548c\u5904\u7406\u5faa\u73af\u5f15\u7528\u65f6\u5c24\u4e3a\u91cd\u8981\u3002\u7136\u800c\uff0c\u6df1\u62f7\u8d1d\u4e5f\u6709\u4e00\u5b9a\u7684\u6027\u80fd\u5f00\u9500\uff0c\u6211\u4eec\u9700\u8981\u6839\u636e\u5177\u4f53\u60c5\u51b5\u6743\u8861\u6df1\u62f7\u8d1d\u7684\u5fc5\u8981\u6027\u548c\u6027\u80fd\u5f71\u54cd\u3002\u6b64\u5916\uff0c\u5bf9\u4e8e\u81ea\u5b9a\u4e49\u5bf9\u8c61\u548c\u7279\u6b8a\u5bf9\u8c61\uff0c\u6211\u4eec\u53ef\u80fd\u9700\u8981\u81ea\u5b9a\u4e49__deepcopy__<\/code>\u65b9\u6cd5\uff0c\u4ee5\u786e\u4fdd\u5bf9\u8c61\u7684\u6df1\u62f7\u8d1d\u884c\u4e3a\u7b26\u5408\u9884\u671f\u3002\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u4e0d\u53ef\u53d8\u5bf9\u8c61\u3001\u51fd\u6570\u5f0f\u7f16\u7a0b\u6216\u6d45\u62f7\u8d1d\u548c\u624b\u52a8\u590d\u5236\u6765\u66ff\u4ee3\u6df1\u62f7\u8d1d\uff0c\u907f\u514d\u6027\u80fd\u5f00\u9500\u548c\u526f\u4f5c\u7528\u3002\u901a\u8fc7\u5408\u7406\u9009\u62e9\u548c\u4f7f\u7528\u6df1\u62f7\u8d1d\uff0c\u6211\u4eec\u53ef\u4ee5\u66f4\u597d\u5730\u7ba1\u7406\u548c\u64cd\u4f5c\u590d\u6742\u7684\u6570\u636e\u7ed3\u6784\uff0c\u786e\u4fdd\u7a0b\u5e8f\u7684\u6b63\u786e\u6027\u548c\u6027\u80fd\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
 \u6df1\u62f7\u8d1d\u4e0e\u6d45\u62f7\u8d1d\u6709\u4ec0\u4e48\u533a\u522b\uff1f<\/strong>
\u6df1\u62f7\u8d1d\u548c\u6d45\u62f7\u8d1d\u662f\u4e24\u79cd\u4e0d\u540c\u7684\u5bf9\u8c61\u590d\u5236\u65b9\u5f0f\u3002\u6d45\u62f7\u8d1d\u4f1a\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u5bf9\u8c61\uff0c\u4f46\u5176\u4e2d\u7684\u5143\u7d20\u4ecd\u7136\u662f\u539f\u5bf9\u8c61\u4e2d\u5143\u7d20\u7684\u5f15\u7528\u3002\u8fd9\u610f\u5473\u7740\u5982\u679c\u539f\u5bf9\u8c61\u4e2d\u7684\u5143\u7d20\u662f\u53ef\u53d8\u7684\uff0c\u90a3\u4e48\u5728\u4fee\u6539\u8fd9\u4e9b\u5143\u7d20\u65f6\uff0c\u4e24\u4e2a\u5bf9\u8c61\u90fd\u4f1a\u53d7\u5230\u5f71\u54cd\u3002\u6df1\u62f7\u8d1d\u5219\u4f1a\u521b\u5efa\u4e00\u4e2a\u5168\u65b0\u7684\u5bf9\u8c61\uff0c\u5e76\u9012\u5f52\u5730\u590d\u5236\u539f\u5bf9\u8c61\u4e2d\u7684\u6240\u6709\u5143\u7d20\uff0c\u786e\u4fdd\u65b0\u5bf9\u8c61\u4e0e\u539f\u5bf9\u8c61\u4e4b\u95f4\u6ca1\u6709\u4efb\u4f55\u5171\u4eab\u7684\u5f15\u7528\u3002\u8fd9\u4f7f\u5f97\u6df1\u62f7\u8d1d\u5728\u5904\u7406\u5305\u542b\u5d4c\u5957\u5bf9\u8c61\u7684\u590d\u6742\u6570\u636e\u7ed3\u6784\u65f6\u66f4\u4e3a\u5b89\u5168\u3002<\/p>\n
\u5728Python\u4e2d\u5982\u4f55\u5b9e\u73b0\u6df1\u62f7\u8d1d\uff1f<\/strong>
\u5728Python\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528copy<\/code>\u6a21\u5757\u4e2d\u7684deepcopy()<\/code>\u51fd\u6570\u6765\u5b9e\u73b0\u6df1\u62f7\u8d1d\u3002\u9996\u5148\u9700\u8981\u5bfc\u5165copy<\/code>\u6a21\u5757\uff0c\u7136\u540e\u8c03\u7528copy.deepcopy()<\/code>\u51fd\u6570\u5e76\u4f20\u5165\u8981\u62f7\u8d1d\u7684\u5bf9\u8c61\u3002\u4f8b\u5982\uff1a  <\/p>\n
import copy\n\noriginal = [1, [2, 3], 4]\ndeep_copied = copy.deepcopy(original)\n<\/code><\/pre>\n
\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0cdeep_copied<\/code>\u5c06\u662foriginal<\/code>\u7684\u4e00\u4e2a\u5168\u65b0\u526f\u672c\uff0c\u4fee\u6539original<\/code>\u4e2d\u7684\u4efb\u4f55\u5143\u7d20\u90fd\u4e0d\u4f1a\u5f71\u54cd\u5230deep_copied<\/code>\u3002<\/p>\n
\u6df1\u62f7\u8d1d\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\u6709\u4ec0\u4e48\u4f18\u52bf\uff1f<\/strong>
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