{"id":10239,"date":"2022-11-10T11:09:56","date_gmt":"2022-11-10T03:09:56","guid":{"rendered":"http:\/\/139.9.1.231\/?p=10239"},"modified":"2022-11-10T11:09:57","modified_gmt":"2022-11-10T03:09:57","slug":"python-copy","status":"publish","type":"post","link":"http:\/\/139.9.1.231\/index.php\/2022\/11\/10\/python-copy\/","title":{"rendered":"python \u6df1\u6d45\u62f7\u8d1d"},"content":{"rendered":"\n

\u62f7\u8d1d\u662fPython\u5b66\u4e60\u8fc7\u7a0b\u4e2d\u5f88\u5bb9\u6613\u88ab\u5ffd\u7565\uff0c\u4f46\u662f\u5728\u9879\u76ee\u5f00\u53d1\u8fc7\u7a0b\u4e2d\u8d77\u7740\u91cd\u8981\u4f5c\u7528\u7684\u4e00\u4e2a\u6982\u5ff5\u3002<\/p>\n\n\n\n

\u6709\u5f88\u591a\u5f00\u53d1\u8005\u7531\u4e8e\u5ffd\u89c6\u8fd9\u4e00\u70b9\uff0c\u751a\u81f3\u5bfc\u81f4\u9879\u76ee\u4e2d\u51fa\u73b0\u5f88\u4e25\u91cd\u7684BUG\u3002<\/p>\n\n\n\n

\u6211\u4e4b\u524d\u5c31\u56e0\u4e3a\u8fd9\u6837\u7684\u4e00\u4e2a\u5c0f\u95ee\u9898\uff0c\u4e00\u4e0d\u5c0f\u5fc3\u6389\u5751\u91cc\u4e86\u3002\u53cd\u590d\u5b9a\u4f4d\u624d\u53d1\u73b0\u7adf\u7136\u662f\u7531\u8fd9\u4e2a\u5bb9\u6613\u88ab\u5ffd\u89c6\u7684\u95ee\u9898\u5f15\u8d77\u7684….<\/p>\n\n\n\n

\u5728\u8fd9\u7bc7\u6587\u7ae0\u4e2d\uff0c\u6211\u4eec\u5c06\u770b\u770b\u5982\u4f55\u5728Python\u4e2d\u6df1\u5ea6\u548c\u6d45\u5ea6\u62f7\u8d1d\u5bf9\u8c61\uff0c\u6df1\u5165\u63a2\u8ba8Python \u5982\u4f55\u5904\u7406\u5bf9\u8c61\u5f15\u7528\u548c\u5185\u5b58\u4e2d\u7684\u5bf9\u8c61\u3002<\/p>\n\n\n\n

\u6d45\u62f7\u8d1d<\/strong><\/h2>\n\n\n\n

\u5f53\u6211\u4eec\u5728 Python \u4e2d\u4f7f\u7528\u8d4b\u503c\u8bed\u53e5 (=) \u6765\u521b\u5efa\u590d\u5408\u5bf9\u8c61\u7684\u526f\u672c\u65f6\uff0c\u4f8b\u5982\uff0c\u5217\u8868\u6216\u7c7b\u5b9e\u4f8b\u6216\u57fa\u672c\u4e0a\u4efb\u4f55\u5305\u542b\u5176\u4ed6\u5bf9\u8c61\u7684\u5bf9\u8c61\uff0cPython \u5e76\u6ca1\u6709\u514b\u9686\u5bf9\u8c61\u672c\u8eab\u3002<\/p>\n\n\n\n

\u76f8\u53cd\uff0c\u5b83\u53ea\u662f\u5c06\u5f15\u7528\u7ed1\u5b9a\u5230\u76ee\u6807\u5bf9\u8c61\u4e0a\u3002<\/p>\n\n\n\n

\u60f3\u8c61\u4e00\u4e0b\uff0c\u6211\u4eec\u6709\u4e00\u4e2a\u5217\u8868\uff0c\u91cc\u9762\u6709\u4ee5\u4e0b\u5143\u7d20\u3002<\/p>\n\n\n\n

original_list =[[1,2,3], [4,5,6], [\"X\", \"Y\", \"Z\"]]<\/code><\/pre>\n\n\n\n
\u5982\u679c\u6211\u4eec\u5c1d\u8bd5\u4f7f\u7528\u5982\u4e0b\u7684\u8d4b\u503c\u8bed\u53e5\u6765\u590d\u5236\u6211\u4eec\u7684\u539f\u59cb\u5217\u8868\u3002<\/p>\n\n\n\n
shallow_copy_list = original_list\nprint(shallow_copy_list)<\/code><\/pre>\n\n\n\n
\u5b83\u53ef\u80fd\u770b\u8d77\u6765\u50cf\u6211\u4eec\u514b\u9686\u4e86\u6211\u4eec\u7684\u5bf9\u8c61\uff0c\u6216\u8bb8\u5f88\u591a\u540c\u5b66\u4f1a\u8ba4\u4e3a\u751f\u6210\u4e86\u4e24\u4e2a\u5bf9\u8c61\uff0c<\/p>\n\n\n\n
[[1,2,3], [4,5,6], ['X', 'Y', 'Z']]<\/code><\/pre>\n\n\n\n
\u4f46\u662f\uff0c\u6211\u4eec\u771f\u7684\u6709\u4e24\u4e2a\u5bf9\u8c61\u5417\uff1f<\/p>\n\n\n\n
\u4e0d\uff0c\u5e76\u6ca1\u6709\u3002\u6211\u4eec\u6709\u4e24\u4e2a\u5f15\u7528\u53d8\u91cf\uff0c\u6307\u5411\u5185\u5b58\u4e2d\u7684\u540c\u4e00\u4e2a\u5bf9\u8c61\u3002\u901a\u8fc7\u6253\u5370\u8fd9\u4e24\u4e2a\u5bf9\u8c61\u5728\u5185\u5b58\u4e2d\u7684ID\uff0c\u53ef\u4ee5\u5f88\u5bb9\u6613\u5730\u9a8c\u8bc1\u8fd9\u4e00\u70b9\u3002<\/p>\n\n\n\n
id(original_list) # 4517445712<\/em>\nid(shallow_copy_list) # 4517445712<\/em><\/code><\/pre>\n\n\n\n
\u4e00\u4e2a\u66f4\u5177\u4f53\u7684\u8bc1\u660e\u53ef\u4ee5\u901a\u8fc7\u5c1d\u8bd5\u6539\u53d8 “\u4e24\u4e2a\u5217\u8868”\u4e2d\u7684\u4e00\u4e2a\u503c\u6765\u89c2\u5bdf–\u800c\u5b9e\u9645\u4e0a\uff0c\u6211\u4eec\u6539\u53d8\u7684\u662f\u540c\u4e00\u4e2a\u5217\u8868\uff0c\u4e24\u4e2a\u6307\u9488\u6307\u5411\u5185\u5b58\u4e2d\u7684\u540c\u4e00\u4e2a\u5bf9\u8c61\u3002<\/p>\n\n\n\n
\u8ba9\u6211\u4eec\u6765\u6539\u53d8original_list<\/code>\u6240\u6307\u5411\u7684\u5bf9\u8c61\u7684\u6700\u540e\u4e00\u4e2a\u5143\u7d20\u3002<\/p>\n\n\n\n
# Last element of last element<\/em>\noriginal_list[-1][-1] = \"ZZZ\"\nprint(original_list)<\/code><\/pre>\n\n\n\n
\u8f93\u51fa\u7ed3\u679c\u662f\uff1a<\/p>\n\n\n\n
[[1, 2, 3], [4, 5, 6], ['X', 'Y', 'ZZZ']]<\/code><\/pre>\n\n\n\n
\u4e24\u4e2a\u5f15\u7528\u53d8\u91cf\u90fd\u6307\u5411\u540c\u4e00\u4e2a\u5bf9\u8c61\uff0c\u6253\u5370shallow_copy_list\u5c06\u8fd4\u56de\u76f8\u540c\u7684\u7ed3\u679c\u3002<\/p>\n\n\n\n
print(shallow_copy_list) # [[1, 2, 3], [4, 5, 6], ['X', 'Y', 'ZZZ']]<\/em><\/code><\/pre>\n\n\n\n
\u6d45\u5c42\u590d\u5236\u662f\u6307\u590d\u5236\u4e00\u4e2a\u5bf9\u8c61\u7684\u5f15\u7528\u5e76\u5c06\u5176\u5b58\u50a8\u5728\u4e00\u4e2a\u65b0\u7684\u53d8\u91cf\u4e2d\u7684\u8fc7\u7a0b\u3002original_list\u548cshallow_copy_list\u53ea\u662f\u6307\u5411\u5185\u5b58\uff08RAM\uff09\u4e2d\u76f8\u540c\u5730\u5740\u7684\u5f15\u7528\uff0c\u8fd9\u4e9b\u5f15\u7528\u5b58\u50a8\u4e86[[1, 2, 3], [4, 5, 6], ['X', 'Y', 'ZZZ']<\/code>\u7684\u503c\u3002<\/p>\n\n\n\n
\"\"\/<\/figure>\n\n\n\n
\u6211\u4eec\u5728\u590d\u5236\u8fc7\u7a0b\u4e2d\uff0c\u5e76\u6ca1\u6709\u751f\u6210\u4e00\u4e2a\u65b0\u7684\u5bf9\u8c61\uff0c\u8bd5\u60f3\u4e00\u4e0b\uff0c\u5982\u679c\u4e0d\u7406\u89e3\u8fd9\u4e00\u70b9\uff0c\u5f88\u591a\u540c\u5b66\u4f1a\u8bef\u8ba4\u4e3a\u5b83\u751f\u6210\u4e86\u4e00\u4e2a\u5b8c\u5168\u72ec\u7acb\u7684\u65b0\u5bf9\u8c61\uff0c\u6b8a\u4e0d\u77e5\uff0c\u5728\u5bf9\u8fd9\u4e2a\u65b0\u53d8\u91cfshallow_copy_list<\/code>\u8fdb\u884c\u64cd\u4f5c\u65f6\uff0c\u539f\u6765\u7684\u53d8\u91cforiginal_list<\/code>\u4e5f\u4f1a\u8ddf\u968f\u6539\u53d8\u3002<\/p>\n\n\n\n
\u9664\u4e86\u8d4b\u503c\u8bed\u53e5\u4e4b\u5916\uff0c\u8fd8\u53ef\u4ee5\u901a\u8fc7Python\u6807\u51c6\u5e93\u7684\u62f7\u8d1d\u6a21\u5757\u5b9e\u73b0\u6d45\u62f7\u8d1d<\/p>\n\n\n\n
\u8981\u4f7f\u7528\u62f7\u8d1d\u6a21\u5757\uff0c\u6211\u4eec\u5fc5\u987b\u9996\u5148\u5bfc\u5165\u5b83\u3002<\/p>\n\n\n\n
import copy\nsecond_shallow_copy_list = copy.copy(original_list)<\/code><\/pre>\n\n\n\n
\u628a\u5b83\u4eec\u90fd\u6253\u5370\u51fa\u6765\uff0c\u770b\u770b\u5b83\u4eec\u662f\u5426\u5f15\u7528\u4e86\u76f8\u540c\u7684\u503c\u3002<\/p>\n\n\n\n
print(original_list)\nprint(second_shallow_copy_list)<\/code><\/pre>\n\n\n\n
\u4e0d\u51fa\u6240\u6599\uff0c\u786e\u5b9e\u5982\u6b64\uff0c<\/p>\n\n\n\n
[[1, 2, 3], [4, 5, 6], ['X', 'Y', 'ZZZ']]\n[[1, 2, 3], [4, 5, 6], ['X', 'Y', 'ZZZ']]<\/code><\/pre>\n\n\n\n
\u901a\u5e38\uff0c\u4f60\u60f3\u590d\u5236\u4e00\u4e2a\u590d\u5408\u5bf9\u8c61\uff0c\u4f8b\u5982\u5728\u4e00\u4e2a\u65b9\u6cd5\u7684\u5f00\u59cb\uff0c\u7136\u540e\u4fee\u6539\u514b\u9686\u7684\u5bf9\u8c61\uff0c\u4f46\u4fdd\u6301\u539f\u59cb\u5bf9\u8c61\u7684\u539f\u6837\uff0c\u4ee5\u4fbf\u4ee5\u540e\u518d\u4f7f\u7528\u5b83\u3002<\/p>\n\n\n\n
\u4e3a\u4e86\u8fbe\u5230\u8fd9\u4e2a\u76ee\u7684\uff0c\u6211\u4eec\u9700\u8981\u5bf9\u8be5\u5bf9\u8c61\u8fdb\u884c\u6df1\u5ea6\u590d\u5236\u3002\u73b0\u5728\u8ba9\u6211\u4eec\u6765\u5b66\u4e60\u4e00\u4e0b\u4ec0\u4e48\u662f\u6df1\u5ea6\u62f7\u8d1d\u4ee5\u53ca\u5982\u4f55\u6df1\u5ea6\u62f7\u8d1d\u4e00\u4e2a\u590d\u5408\u5bf9\u8c61\u3002<\/p>\n\n\n\n
\u6df1\u62f7\u8d1d<\/strong><\/h2>\n\n\n\n
\u6df1\u5ea6\u590d\u5236\u4e00\u4e2a\u5bf9\u8c61\u610f\u5473\u7740\u771f\u6b63\u5730\u5c06\u8be5\u5bf9\u8c61\u548c\u5b83\u7684\u503c\u514b\u9686\u5230\u5185\u5b58\u4e2d\u7684\u4e00\u4e2a\u65b0\u7684\u526f\u672c\uff08\u5b9e\u4f8b\uff09\u4e2d\uff0c\u5e76\u5177\u6709\u8fd9\u4e9b\u76f8\u540c\u7684\u503c\u3002<\/p><\/blockquote>\n\n\n\n
\u901a\u8fc7\u6df1\u5ea6\u62f7\u8d1d\uff0c\u6211\u4eec\u5b9e\u9645\u4e0a\u53ef\u4ee5\u521b\u5efa\u4e00\u4e2a\u72ec\u7acb\u4e8e\u539f\u59cb\u6570\u636e\u7684\u65b0\u5bf9\u8c61\uff0c\u4f46\u5305\u542b\u76f8\u540c\u7684\u503c\uff0c\u800c\u4e0d\u662f\u4e3a\u76f8\u540c\u7684\u503c\u521b\u5efa\u65b0\u7684\u5f15\u7528\u3002<\/p>\n\n\n\n
\u5728\u4e00\u4e2a\u5178\u578b\u7684\u6df1\u5ea6\u62f7\u8d1d\u8fc7\u7a0b\u4e2d\uff0c\u9996\u5148\uff0c\u4e00\u4e2a\u65b0\u7684\u5bf9\u8c61\u5f15\u7528\u88ab\u521b\u5efa\uff0c\u7136\u540e\u6240\u6709\u7684\u5b50\u5bf9\u8c61\u88ab\u9012\u5f52\u5730\u52a0\u5165\u5230\u7236\u5bf9\u8c61\u4e2d\u3002<\/p><\/blockquote>\n\n\n\n
\u8fd9\u6837\u4e00\u6765\uff0c\u4e0e\u6d45\u5c42\u62f7\u8d1d\u4e0d\u540c\uff0c\u5bf9\u539f\u59cb\u5bf9\u8c61\u7684\u4efb\u4f55\u4fee\u6539\u90fd\u4e0d\u4f1a\u53cd\u6620\u5728\u62f7\u8d1d\u5bf9\u8c61\u4e2d\uff08\u53cd\u4e4b\u4ea6\u7136\uff09\u3002<\/p>\n\n\n\n
\u4e0b\u9762\u662f\u4e00\u4e2a\u5178\u578b\u7684\u6df1\u5ea6\u62f7\u8d1d\u7684\u7b80\u5355\u56fe\u793a\u3002<\/p>\n\n\n\n
\"\"\/<\/figure>\n\n\n\n
\u8981\u5728 Python \u4e2d\u6df1\u5ea6\u62f7\u8d1d\u4e00\u4e2a\u5bf9\u8c61\uff0c\u6211\u4eec\u4f7f\u7528 copy<\/code> \u6a21\u5757\u7684 deepcopy()<\/code>\u65b9\u6cd5\u3002<\/p>\n\n\n\n
\u8ba9\u6211\u4eec\u5bfc\u5165 copy<\/code> \u6a21\u5757\u5e76\u521b\u5efa\u4e00\u4e2a\u5217\u8868\u7684\u6df1\u5ea6\u62f7\u8d1d\u3002<\/p>\n\n\n\n
import copy\n \noriginal_list = [[1,2,3], [4,5,6], [\"X\", \"Y\", \"Z\"]]\ndeepcopy_list = copy.deepcopy(original_list)<\/code><\/pre>\n\n\n\n
\u73b0\u5728\u8ba9\u6211\u4eec\u6253\u5370\u6211\u4eec\u7684\u5217\u8868\uff0c\u4ee5\u786e\u4fdd\u8f93\u51fa\u662f\u76f8\u540c\u7684\uff0c\u4ee5\u53ca\u4ed6\u4eec\u7684ID\u662f\u552f\u4e00\u7684\u3002<\/p>\n\n\n\n
print(id(original_list), original_list)\nprint(id(deepcopy_list), deepcopy_list)<\/code><\/pre>\n\n\n\n
\u8f93\u51fa\u7ed3\u679c\u8bc1\u5b9e\uff0c\u6211\u4eec\u5df2\u7ecf\u4e3a\u81ea\u5df1\u521b\u5efa\u4e86\u4e00\u4e2a\u771f\u6b63\u7684\u526f\u672c\u3002<\/p>\n\n\n\n
4517599280, [[1, 2, 3], [4, 5, 6], ['X', 'Y', 'Z']]\n4517599424, [[1, 2, 3], [4, 5, 6], ['X', 'Y', 'Z']]<\/code><\/pre>\n\n\n\n
\u73b0\u5728\u8ba9\u6211\u4eec\u8bd5\u7740\u4fee\u6539\u6211\u4eec\u7684\u539f\u59cb\u5217\u8868\uff0c\u628a\u6700\u540e\u4e00\u4e2a\u5217\u8868\u7684\u6700\u540e\u4e00\u4e2a\u5143\u7d20\u6539\u4e3a “O”\uff0c\u7136\u540e\u6253\u5370\u51fa\u6765\u770b\u770b\u7ed3\u679c\u3002<\/p>\n\n\n\n
original_list[-1][-1] = \"O\"\nprint(original_list)<\/code><\/pre>\n\n\n\n
\u6211\u4eec\u5f97\u5230\u4e86\u9884\u671f\u7684\u7ed3\u679c\u3002<\/p>\n\n\n\n
[[1, 2, 3], [4, 5, 6], ['X', 'Y', 'O']]<\/code><\/pre>\n\n\n\n
\u73b0\u5728\uff0c\u5982\u679c\u6211\u4eec\u7ee7\u7eed\u524d\u8fdb\u5e76\u5c1d\u8bd5\u6253\u5370\u6211\u4eec\u7684\u526f\u672c\u5217\u8868\uff0c\u4e4b\u524d\u7684\u4fee\u6539\u5e76\u6ca1\u6709\u5f71\u54cd\u65b0\u7684\u53d8\u91cf\u3002<\/p>\n\n\n\n
print(deepcopy_list) # [[1, 2, 3], [4, 5, 6], ['X', 'Y', 'Z']]<\/em><\/code><\/pre>\n\n\n\n
\u8bb0\u4f4f\uff0ccopy()<\/code>\u548cdeepcopy()<\/code>\u65b9\u6cd5\u9002\u7528\u4e8e\u5176\u4ed6\u590d\u5408\u5bf9\u8c61\u3002\u8fd9\u610f\u5473\u7740\uff0c\u4f60\u4e5f\u53ef\u4ee5\u7528\u5b83\u4eec\u6765\u521b\u5efa\u7c7b\u5b9e\u4f8b\u7684\u526f\u672c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u62f7\u8d1d\u662fPython\u5b66\u4e60\u8fc7\u7a0b\u4e2d\u5f88\u5bb9\u6613\u88ab\u5ffd\u7565\uff0c\u4f46\u662f\u5728\u9879\u76ee\u5f00\u53d1\u8fc7\u7a0b\u4e2d\u8d77\u7740\u91cd\u8981\u4f5c\u7528\u7684\u4e00\u4e2a\u6982\u5ff5\u3002 \u6709\u5f88\u591a\u5f00\u53d1\u8005\u7531\u4e8e\u5ffd\u89c6\u8fd9 … \u7ee7\u7eed\u9605\u8bfbpython \u6df1\u6d45\u62f7\u8d1d<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[8,11],"tags":[],"_links":{"self":[{"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/posts\/10239"}],"collection":[{"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/comments?post=10239"}],"version-history":[{"count":2,"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/posts\/10239\/revisions"}],"predecessor-version":[{"id":10241,"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/posts\/10239\/revisions\/10241"}],"wp:attachment":[{"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/media?parent=10239"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/categories?post=10239"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/139.9.1.231\/index.php\/wp-json\/wp\/v2\/tags?post=10239"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}