{"id":204624,"date":"2025-05-29T10:00:38","date_gmt":"2025-05-29T02:00:38","guid":{"rendered":"https:\/\/server.hk\/cnblog\/204624\/"},"modified":"2025-05-29T10:00:38","modified_gmt":"2025-05-29T02:00:38","slug":"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8-groupby-%e5%87%bd%e6%95%b0%e5%af%b9-pandas-%e6%95%b0%e6%8d%ae%e6%a1%86%e8%bf%9b%e8%a1%8c%e5%88%86%e7%bb%84%e5%b9%b6%e8%ae%a1%e7%ae%97%e5%9d%87%e5%80%bc%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/204624\/","title":{"rendered":"\u5982\u4f55\u4f7f\u7528 Groupby() \u51fd\u6570\u5bf9 Pandas \u6570\u636e\u6846\u8fdb\u884c\u5206\u7ec4\u5e76\u8ba1\u7b97\u5747\u503c\uff1f"},"content":{"rendered":"<p><b><\/b>     <\/p>\n<h1>\u5982\u4f55\u4f7f\u7528 Groupby() \u51fd\u6570\u5bf9 Pandas \u6570\u636e\u6846\u8fdb\u884c\u5206\u7ec4\u5e76\u8ba1\u7b97\u5747\u503c\uff1f<\/h1>\n<p>\u4f60\u5728\u5b66\u4e60\u76f8\u5173\u7684\u77e5\u8bc6\u5417\uff1f\u672c\u6587<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\">\u300a\u5982\u4f55\u4f7f\u7528 Groupby() \u51fd\u6570\u5bf9 Pandas \u6570\u636e\u6846\u8fdb\u884c\u5206\u7ec4\u5e76\u8ba1\u7b97\u5747\u503c\uff1f\u300b<\/span>\uff0c\u4e3b\u8981\u4ecb\u7ecd\u7684\u5185\u5bb9\u5c31\u6d89\u53ca\u5230<span style=\"color: #FF6600;, Helvetica, Arial, sans-serif;font-size: 14px;background-color: #FFFFFF\"><\/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><img decoding=\"async\" src=\"https:\/\/www.17golang.com\/uploads\/20241111\/1731331299673204e3e620e.jpg\" class=\"aligncenter\"><\/p>\n<p><strong>\u89e3\u51b3 groupby() \u95ee\u9898\uff0c\u8f7b\u677e\u5904\u7406\u6570\u636e\u5206\u7ec4<\/strong><\/p>\n<p>\u5728\u672c\u7bc7\u95ee\u7b54\u4e2d\uff0c\u6211\u4eec\u5c06\u63a2\u7d22\u4e00\u4e2a\u5e38\u89c1\u7684 pandas \u95ee\u9898\uff0c\u5373\u5982\u4f55\u4f7f\u7528 groupby() \u51fd\u6570\u5bf9\u6570\u636e\u6846\u8fdb\u884c\u5206\u7ec4\uff0c\u5e76\u8f93\u51fa\u5206\u7ec4\u540e\u6570\u636e\u7684\u5747\u503c\u3002<\/p>\n<p><strong>\u95ee\u9898\uff1a<\/strong><\/p>\n<p>\u6211\u4eec\u6709\u4e00\u4e2a\u6570\u636e\u6846 df\uff0c\u5176\u4e2d\u5305\u542b\u4e86\u4ee5\u4e0b\u6570\u636e\uff1a<\/p>\n<table>\n<thead>\n<tr>\n<th>major<\/th>\n<th>grade<\/th>\n<th>age<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>math<\/td>\n<td>3<\/td>\n<td>20<\/td>\n<\/tr>\n<tr>\n<td>physics<\/td>\n<td>2<\/td>\n<td>18<\/td>\n<\/tr>\n<tr>\n<td>math<\/td>\n<td>2<\/td>\n<td>19<\/td>\n<\/tr>\n<tr>\n<td>math<\/td>\n<td>1<\/td>\n<td>21<\/td>\n<\/tr>\n<tr>\n<td>physics<\/td>\n<td>1<\/td>\n<td>20<\/td>\n<\/tr>\n<tr>\n<td>math<\/td>\n<td>3<\/td>\n<td>19<\/td>\n<\/tr>\n<tr>\n<td>math<\/td>\n<td>3<\/td>\n<td>19<\/td>\n<\/tr>\n<tr>\n<td>physics<\/td>\n<td>2<\/td>\n<td>18<\/td>\n<\/tr>\n<tr>\n<td>demograghy<\/td>\n<td>2<\/td>\n<td>20<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u5982\u4f55\u4f7f\u7528 groupby() \u51fd\u6570\u5bf9 major \u5217\u5206\u7ec4\uff0c\u5e76\u8ba1\u7b97 grade \u5217\u7684\u5747\u503c\uff0c\u4ece\u800c\u8f93\u51fa\u4ee5\u4e0b\u7ed3\u679c\uff1a<\/p>\n<table>\n<thead>\n<tr>\n<th>grade<\/th>\n<th>1<\/th>\n<th>2<\/th>\n<th>3<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>major<\/td>\n<td> <\/td>\n<td> <\/td>\n<td> <\/td>\n<\/tr>\n<tr>\n<td>demography<\/td>\n<td> <\/td>\n<td>2<\/td>\n<td> <\/td>\n<\/tr>\n<tr>\n<td>math<\/td>\n<td>1<\/td>\n<td>2<\/td>\n<td>3<\/td>\n<\/tr>\n<tr>\n<td>physics<\/td>\n<td>1<\/td>\n<td>2<\/td>\n<td> <\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p><strong>\u7b54\u6848\uff1a<\/strong><\/p>\n<p>\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u4ee3\u7801\u5b9e\u73b0\u4e0a\u8ff0\u529f\u80fd\uff1a<\/p>\n<pre>  df.groupby(['Major']).mean()[\"Grade\"]<\/pre>\n<p><strong>\u89e3\u91ca\uff1a<\/strong><\/p>\n<ul>\n<li>df.groupby([&#8216;major&#8217;]): \u6309\u7167 major \u5217\u5bf9\u6570\u636e\u6846\u8fdb\u884c\u5206\u7ec4\u3002<\/li>\n<li>.mean(): \u9488\u5bf9\u6bcf\u4e2a\u5206\u7ec4\uff0c\u8ba1\u7b97 grade \u5217\u7684\u5747\u503c\u3002<\/li>\n<li><\/li>\n<\/ul>\n<p>\u6587\u4e2d\u5173\u4e8e\u7684\u77e5\u8bc6\u4ecb\u7ecd\uff0c\u5e0c\u671b\u5bf9\u4f60\u7684\u5b66\u4e60\u6709\u6240\u5e2e\u52a9\uff01\u82e5\u662f\u53d7\u76ca\u532a\u6d45\uff0c\u90a3\u5c31\u52a8\u52a8\u9f20\u6807\u6536\u85cf\u8fd9\u7bc7\u300a\u5982\u4f55\u4f7f\u7528 Groupby() \u51fd\u6570\u5bf9 Pandas \u6570\u636e\u6846\u8fdb\u884c\u5206\u7ec4\u5e76\u8ba1\u7b97\u5747\u503c\uff1f\u300b\u6587\u7ae0\u5427\uff0c\u4e5f\u53ef\u5173\u6ce8\u516c\u4f17\u53f7\u4e86\u89e3\u76f8\u5173\u6280\u672f\u6587\u7ae0\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5982\u4f55\u4f7f\u7528 Groupby() \u51fd&#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-204624","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/204624","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=204624"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/204624\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=204624"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=204624"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=204624"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}