{"id":204829,"date":"2025-05-29T10:35:04","date_gmt":"2025-05-29T02:35:04","guid":{"rendered":"https:\/\/server.hk\/cnblog\/204829\/"},"modified":"2025-05-29T10:35:04","modified_gmt":"2025-05-29T02:35:04","slug":"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8-groupby-%e5%87%bd%e6%95%b0%e5%af%b9-dataframe-%e8%bf%9b%e8%a1%8c%e5%88%86%e7%bb%84%e5%b9%b6%e8%ae%a1%e7%ae%97-grade-%e5%88%97%e7%9a%84%e5%9d%87%e5%80%bc","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/204829\/","title":{"rendered":"\u5982\u4f55\u4f7f\u7528 groupby() \u51fd\u6570\u5bf9 DataFrame \u8fdb\u884c\u5206\u7ec4\u5e76\u8ba1\u7b97 “Grade” \u5217\u7684\u5747\u503c\uff1f"},"content":{"rendered":"

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

\u5982\u4f55\u4f7f\u7528 groupby() \u51fd\u6570\u5bf9 DataFrame \u8fdb\u884c\u5206\u7ec4\u5e76\u8ba1\u7b97 “Grade” \u5217\u7684\u5747\u503c\uff1f<\/h1>\n

\u6700\u8fd1\u53d1\u73b0\u4e0d\u5c11\u5c0f\u4f19\u4f34\u90fd\u5bf9\u5f88\u611f\u5174\u8da3\uff0c\u6240\u4ee5\u4eca\u5929\u7ee7\u7eed\u7ed9\u5927\u5bb6\u4ecb\u7ecd\u6587\u7ae0<\/span>\u76f8\u5173\u7684\u77e5\u8bc6\uff0c\u672c\u6587\u300a\u5982\u4f55\u4f7f\u7528 groupby() \u51fd\u6570\u5bf9 DataFrame \u8fdb\u884c\u5206\u7ec4\u5e76\u8ba1\u7b97 “Grade” \u5217\u7684\u5747\u503c\uff1f\u300b<\/span>\u4e3b\u8981\u5185\u5bb9\u6d89\u53ca\u5230<\/span>\u7b49\u7b49\u77e5\u8bc6\u70b9\uff0c\u5e0c\u671b\u80fd\u5e2e\u5230\u4f60\uff01\u5f53\u7136\u5982\u679c\u9605\u8bfb\u672c\u6587\u65f6\u5b58\u5728\u4e0d\u540c\u60f3\u6cd5\uff0c\u53ef\u4ee5\u5728\u8bc4\u8bba\u4e2d\u8868\u8fbe\uff0c\u4f46\u662f\u8bf7\u52ff\u4f7f\u7528\u8fc7\u6fc0\u7684\u63aa\u8f9e~<\/p>\n

<\/p>\n

\u6c42\u6559 groupby() \u51fd\u6570\u5206\u7ec4\u7edf\u8ba1\u5747\u503c<\/strong><\/p>\n

\u7ed9\u5b9a\u5982\u4e0b dataframe df\uff1a<\/p>\n

df = pd.dataframe({'major':['math','physics','math','math','physics','math','math','physics','demograghy'],'grade':['3','2','2','1','1','3','3','2','2'],'age':[20,18,19,21,20,19,19,18,20]})<\/pre>\n
\u73b0\u5e0c\u671b\u5229\u7528 groupby() \u51fd\u6570\u6309\u7167 “major” \u5217\u5206\u7ec4\uff0c\u5e76\u8ba1\u7b97 “grade” \u5217\u7684\u5747\u503c\u3002\u6700\u7ec8\u7ed3\u679c\u5e94\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n
grade                1           2           3\nmajor\ndemography<br>\nmath<br>\npyhsics<\/pre>\n
\u89e3\u51b3\u65b9\u6848\uff1a<\/strong><\/p>\n
\u8981\u5b9e\u73b0\u4e0a\u8ff0\u9700\u6c42\uff0c\u53ef\u4ee5\u8bbe\u7f6e groupby() \u51fd\u6570\u7684\u53c2\u6570\u5982\u4e0b\uff1a<\/p>\n
df.groupby([\"Major\"]).mean(\"Grade\")<\/pre>\n
\u6b65\u9aa4\u89e3\u6790\uff1a<\/strong><\/p>\n
    \n
  • groupby([“major”])\uff1a\u6309\u7167 “major” \u5217\u5206\u7ec4\uff0c\u8fd4\u56de\u4e00\u4e2a dataframegroupby \u5bf9\u8c61\u3002<\/li>\n
  • mean(“grade”)\uff1a\u5728\u5206\u7ec4\u5bf9\u8c61\u4e0a\u8ba1\u7b97 “grade” \u5217\u7684\u5747\u503c\u3002<\/li>\n<\/ul>\n
    \u6700\u7ec8\uff0cgroupby([“major”]).mean(“grade”) \u4f1a\u8fd4\u56de\u4e00\u4e2a\u65b0\u7684 dataframe\uff0c\u5176\u4e2d “grade” \u5217\u7684\u503c\u4e3a\u5206\u7ec4\u540e\u7684\u5747\u503c\u3002<\/p>\n
    \u4ee5\u4e0a\u5c31\u662f\u672c\u6587\u7684\u5168\u90e8\u5185\u5bb9\u4e86\uff0c\u662f\u5426\u6709\u987a\u5229\u5e2e\u52a9\u4f60\u89e3\u51b3\u95ee\u9898\uff1f\u82e5\u662f\u80fd\u7ed9\u4f60\u5e26\u6765\u5b66\u4e60\u4e0a\u7684\u5e2e\u52a9\uff0c\u8bf7\u5927\u5bb6\u591a\u591a\u652f\u6301\uff01\u66f4\u591a\u5173\u4e8e\u6587\u7ae0\u7684\u76f8\u5173\u77e5\u8bc6\uff0c\u4e5f\u53ef\u5173\u6ce8\u516c\u4f17\u53f7\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
    \u5982\u4f55\u4f7f\u7528 groupby() \u51fd...<\/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-204829","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/204829","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=204829"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/204829\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=204829"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=204829"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=204829"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}