{"id":205244,"date":"2025-05-29T10:42:22","date_gmt":"2025-05-29T02:42:22","guid":{"rendered":"https:\/\/server.hk\/cnblog\/205244\/"},"modified":"2025-05-29T10:42:22","modified_gmt":"2025-05-29T02:42:22","slug":"%e5%a6%82%e4%bd%95%e5%b0%86%e4%b8%a4%e4%b8%aa-dataframe-%e5%90%88%e5%b9%b6%e5%b9%b6%e5%a1%ab%e5%85%85%e7%bc%ba%e5%a4%b1%e5%80%bc%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/205244\/","title":{"rendered":"\u5982\u4f55\u5c06\u4e24\u4e2a DataFrame \u5408\u5e76\u5e76\u586b\u5145\u7f3a\u5931\u503c\uff1f"},"content":{"rendered":"<p><b><\/b>     <\/p>\n<h1>\u5982\u4f55\u5c06\u4e24\u4e2a DataFrame \u5408\u5e76\u5e76\u586b\u5145\u7f3a\u5931\u503c\uff1f<\/h1>\n<p>\u4eb2\u7231\u7684\u7f16\u7a0b\u5b66\u4e60\u7231\u597d\u8005\uff0c\u5982\u679c\u4f60\u70b9\u5f00\u4e86\u8fd9\u7bc7\u6587\u7ae0\uff0c\u8bf4\u660e\u4f60\u5bf9\u300a\u5982\u4f55\u5c06\u4e24\u4e2a DataFrame \u5408\u5e76\u5e76\u586b\u5145\u7f3a\u5931\u503c\uff1f\u300b\u5f88\u611f\u5174\u8da3\u3002\u672c\u7bc7\u6587\u7ae0\u5c31\u6765\u7ed9\u5927\u5bb6\u8be6\u7ec6\u89e3\u6790\u4e00\u4e0b\uff0c\u4e3b\u8981\u4ecb\u7ecd\u4e00\u4e0b\uff0c\u5e0c\u671b\u6240\u6709\u8ba4\u771f\u8bfb\u5b8c\u7684\u7ae5\u978b\u4eec\uff0c\u90fd\u6709\u5b9e\u8d28\u6027\u7684\u63d0\u9ad8\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241127\/173267229567467b272c20f.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>\u5982\u4f55\u5408\u5e76\u4e24\u4e2a dataframe<\/strong><\/p>\n<p>\u6211\u4eec\u60f3\u5c06\u4e24\u4e2a dataframe\uff0cdataframe1 \u548c dataframe2 \u5408\u5e76\u6210 dataframe3\u3002\u6211\u4eec\u8981\u6c42\uff1a<\/p>\n<ul>\n<li>\u5c06 dataframe2 \u7684\u6570\u636e\u6dfb\u52a0\u5230 dataframe1 \u7684\u672b\u5c3e\u3002<\/li>\n<li>dataframe1 \u4e2d\u5b58\u5728\u4f46 dataframe2 \u4e2d\u4e0d\u5b58\u5728\u7684\u5217 c \u7684\u503c\u5bf9\u4e8e\u884c test3 \u5e94\u4e3a 0\u3002<\/li>\n<li>dataframe2 \u4e2d\u5b58\u5728\u4f46 dataframe1 \u4e2d\u4e0d\u5b58\u5728\u7684\u5217 d \u7684\u503c\u5bf9\u4e8e\u884c test1 \u548c test2 \u5e94\u4e3a 0\u3002<\/li>\n<\/ul>\n<p>\u8981\u6c42\u5728 python \u4e2d\u5b9e\u73b0\u6b64\u5408\u5e76\u3002\u6211\u4eec\u53ef\u4ee5\u5229\u7528 numpy \u548c pandas \u6a21\u5757\u6765\u5b8c\u6210\u6b64\u4efb\u52a1\uff0c\u65b9\u6cd5\u5982\u4e0b\uff1a<\/p>\n<ol>\n<li>\u5bfc\u5165\u5fc5\u8981\u7684\u6a21\u5757\uff1a<\/li>\n<\/ol>\n<pre>import numpy as np\nimport pandas as pd<\/pre>\n<ol>\n<li>\u51c6\u5907\u4e24\u4e2a dataframe\uff1a<\/li>\n<\/ol>\n<pre>dataframe1 = pd.dataframe({\n    \"name\": [\"test1\", \"test2\"],\n    \"a\": [1, 11],\n    \"b\": [2, 10],\n    \"c\": [2, 9],\n    \"label\": [1, 2]\n})\n\ndataframe2 = pd.dataframe({\n    \"name\": [\"test3\"],\n    \"b\": [3],\n    \"a\": [2],\n    \"d\": [1],\n    \"label\": [\"unkonwn\"]\n})<\/pre>\n<ol>\n<li>\u4f7f\u7528 numpy \u4e3a\u4e0d\u5b58\u5728\u7684\u5217\u586b\u5145 0\uff1a<\/li>\n<\/ol>\n<pre>dataframe1[\"d\"] = 0  # \u4e3a dataframe1 \u586b\u5145 d \u5217\ndataframe2[\"c\"] = 0  # \u4e3a dataframe2 \u586b\u5145 c \u5217<\/pre>\n<ol>\n<li>\u4f7f\u7528 pandas \u5408\u5e76 dataframe\uff1a<\/li>\n<\/ol>\n<pre>dataframe3 = pd.concat([dataframe1, dataframe2], ignore_index=True)<\/pre>\n<p>\u5408\u5e76\u7ed3\u679c\u5b58\u50a8\u5728 dataframe3 \u4e2d\u3002<\/p>\n<p>\u7ec8\u4e8e\u4ecb\u7ecd\u5b8c\u5566\uff01\u5c0f\u4f19\u4f34\u4eec\uff0c\u8fd9\u7bc7\u5173\u4e8e\u300a\u5982\u4f55\u5c06\u4e24\u4e2a DataFrame \u5408\u5e76\u5e76\u586b\u5145\u7f3a\u5931\u503c\uff1f\u300b\u7684\u4ecb\u7ecd\u5e94\u8be5\u8ba9\u4f60\u6536\u83b7\u591a\u591a\u4e86\u5427\uff01\u6b22\u8fce\u5927\u5bb6\u6536\u85cf\u6216\u5206\u4eab\u7ed9\u66f4\u591a\u9700\u8981\u5b66\u4e60\u7684\u670b\u53cb\u5427~\u516c\u4f17\u53f7\u4e5f\u4f1a\u53d1\u5e03\u6587\u7ae0\u76f8\u5173\u77e5\u8bc6\uff0c\u5feb\u6765\u5173\u6ce8\u5427\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5982\u4f55\u5c06\u4e24\u4e2a DataFrame &#46;&#46;&#46;<\/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-205244","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/205244","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=205244"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/205244\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=205244"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=205244"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=205244"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}