{"id":205194,"date":"2025-05-29T10:21:24","date_gmt":"2025-05-29T02:21:24","guid":{"rendered":"https:\/\/server.hk\/cnblog\/205194\/"},"modified":"2025-05-29T10:21:24","modified_gmt":"2025-05-29T02:21:24","slug":"pandas%e4%b8%ad%e5%a6%82%e4%bd%95%e9%ab%98%e6%95%88%e5%a4%84%e7%90%86%e6%97%b6%e9%97%b4%e6%88%b3%e7%a9%ba%e5%80%bc%e5%b9%b6%e8%bd%ac%e6%8d%a2%e4%b8%ba%e5%ad%97%e7%ac%a6%e4%b8%b2%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/205194\/","title":{"rendered":"Pandas\u4e2d\u5982\u4f55\u9ad8\u6548\u5904\u7406\u65f6\u95f4\u6233\u7a7a\u503c\u5e76\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32\uff1f"},"content":{"rendered":"

<\/b> <\/p>\n

Pandas\u4e2d\u5982\u4f55\u9ad8\u6548\u5904\u7406\u65f6\u95f4\u6233\u7a7a\u503c\u5e76\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32\uff1f<\/h1>\n

\u4f60\u5728\u5b66\u4e60\u76f8\u5173\u7684\u77e5\u8bc6\u5417\uff1f\u672c\u6587\u300aPandas\u4e2d\u5982\u4f55\u9ad8\u6548\u5904\u7406\u65f6\u95f4\u6233\u7a7a\u503c\u5e76\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32\uff1f\u300b<\/span>\uff0c\u4e3b\u8981\u4ecb\u7ecd\u7684\u5185\u5bb9\u5c31\u6d89\u53ca\u5230<\/span>\uff0c\u5982\u679c\u4f60\u60f3\u63d0\u5347\u81ea\u5df1\u7684\u5f00\u53d1\u80fd\u529b\uff0c\u5c31\u4e0d\u8981\u9519\u8fc7\u8fd9\u7bc7\u6587\u7ae0\uff0c\u5927\u5bb6\u8981\u77e5\u9053\u7f16\u7a0b\u7406\u8bba\u57fa\u7840\u548c\u5b9e\u6218\u64cd\u4f5c\u90fd\u662f\u4e0d\u53ef\u6216\u7f3a\u7684\u54e6\uff01<\/p>\n

<\/p>\n

pandas\u5904\u7406\u65f6\u95f4\u6233\u7a7a\u503c\u8f6c\u5316\u4e3a\u5b57\u7b26\u4e32\u9ad8\u6548\u89e3\u51b3\u65b9\u6848<\/strong><\/p>\n

\u5728\u6570\u636e\u5904\u7406\u4e2d\uff0c\u5c06\u65f6\u95f4\u6233\u8f6c\u5316\u4e3a\u5b57\u7b26\u4e32\u683c\u5f0f\u5bf9\u4e8e\u6570\u636e\u5206\u6790\u548c\u53ef\u89c6\u5316\u81f3\u5173\u91cd\u8981\u3002\u4f46\u5f53\u65f6\u95f4\u6233\u5b58\u5728\u7a7a\u503c\uff08nattype\uff09\u65f6\uff0c\u76f4\u63a5\u4f7f\u7528timestamp.strftime(‘%y-%m-%d’)\u4f1a\u62a5\u9519\u3002\u672c\u6587\u5c06\u63a2\u8ba8\u5982\u4f55\u9ad8\u6548\u5904\u7406\u6b64\u95ee\u9898\u3002<\/p>\n

\u89e3\u51b3\u65b9\u6848<\/strong><\/p>\n

\u91c7\u7528lambda\u51fd\u6570\u5bf9\u65f6\u95f4\u6233\u8fdb\u884c\u6620\u5c04\u5904\u7406\uff0c\u5f53\u9047\u5230nat\u65f6\u8fd4\u56denone\uff1a<\/p>\n

import pandas as pd\nimport numpy as np\n\n# \u793a\u4f8b\u6570\u636e\ndata = {\n    '\u51fa\u5382\u65e5\u671f': [pd.Timestamp('2021-01-01'), pd.NaT, pd.Timestamp('2021-01-03')]\n}\n\ndf = pd.DataFrame(data)\n\ndf['\u51fa\u5382\u65e5\u671f'] = df['\u51fa\u5382\u65e5\u671f'].map(lambda x: x.strftime('%Y-%m-%d') if pd.notna(x) else None)\n\nprint(df)<\/pre>\n
\u6b64\u65b9\u6848\u5229\u7528\u4e86lambda\u51fd\u6570\u5bf9\u6bcf\u4e2a\u65f6\u95f4\u6233\u8fdb\u884c\u5224\u65ad\u5904\u7406\uff0c\u5982\u679c\u65f6\u95f4\u6233\u4e0d\u4e3anat\uff0c\u5219\u5c06\u5176\u8f6c\u5316\u4e3a\u5b57\u7b26\u4e32\u683c\u5f0f\uff1b\u5426\u5219\uff0c\u8fd4\u56denone\u3002\u907f\u514d\u4e86\u76f4\u63a5\u4f7f\u7528timestamp.strftime(‘%y-%m-%d’)\u5e26\u6765\u7684\u62a5\u9519\u95ee\u9898\uff0c\u540c\u65f6\u5bf9\u7a7a\u503c\u8fdb\u884c\u4e86\u9002\u5f53\u5904\u7406\u3002<\/p>\n
\u8be5\u65b9\u6848\u53ef\u4ee5\u9ad8\u6548\u5730\u5bf9pandas\u4e2d\u7684\u65f6\u95f4\u6233\u8fdb\u884c\u5b57\u7b26\u4e32\u683c\u5f0f\u8f6c\u6362\uff0c\u5e76\u8f7b\u677e\u5904\u7406nat\u7a7a\u503c\uff0c\u9002\u7528\u4e8e\u5404\u79cd\u6570\u636e\u5904\u7406\u573a\u666f\u3002<\/p>\n
\u4eca\u5929\u5173\u4e8e\u300aPandas\u4e2d\u5982\u4f55\u9ad8\u6548\u5904\u7406\u65f6\u95f4\u6233\u7a7a\u503c\u5e76\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32\uff1f\u300b\u7684\u5185\u5bb9\u5c31\u4ecb\u7ecd\u5230\u8fd9\u91cc\u4e86\uff0c\u662f\u4e0d\u662f\u5b66\u8d77\u6765\u4e00\u76ee\u4e86\u7136\uff01\u60f3\u8981\u4e86\u89e3\u66f4\u591a\u5173\u4e8e\u7684\u5185\u5bb9\u8bf7\u5173\u6ce8\u516c\u4f17\u53f7\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
Pandas\u4e2d\u5982\u4f55\u9ad8\u6548\u5904\u7406\u65f6\u95f4\u6233...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4925],"tags":[],"class_list":["post-205194","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/205194","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=205194"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/205194\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=205194"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=205194"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=205194"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}