{"id":205329,"date":"2025-05-29T16:41:25","date_gmt":"2025-05-29T08:41:25","guid":{"rendered":"https:\/\/server.hk\/cnblog\/205329\/"},"modified":"2025-05-29T16:41:25","modified_gmt":"2025-05-29T08:41:25","slug":"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8pandas%e7%bb%9f%e8%ae%a1%e8%bd%ac%e6%8d%a2%e5%90%8e%e7%9a%84%e5%88%97%e6%95%b0%e6%8d%ae%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/205329\/","title":{"rendered":"\u5982\u4f55\u4f7f\u7528pandas\u7edf\u8ba1\u8f6c\u6362\u540e\u7684\u5217\u6570\u636e\uff1f"},"content":{"rendered":"

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

\u5982\u4f55\u4f7f\u7528pandas\u7edf\u8ba1\u8f6c\u6362\u540e\u7684\u5217\u6570\u636e\uff1f<\/h1>\n

\u73cd\u60dc\u65f6\u95f4\uff0c\u52e4\u594b\u5b66\u4e60\uff01\u4eca\u5929\u7ed9\u5927\u5bb6\u5e26\u6765\uff0c\u6b63\u6587\u5185\u5bb9\u4e3b\u8981\u6d89\u53ca\u5230<\/span>\u7b49\u7b49\uff0c\u5982\u679c\u4f60\u6b63\u5728\u5b66\u4e60\u6587\u7ae0<\/span>\uff0c\u6216\u8005\u662f\u5bf9\u6587\u7ae0<\/span>\u6709\u7591\u95ee\uff0c\u6b22\u8fce\u5927\u5bb6\u5173\u6ce8\u6211\uff01\u540e\u9762\u6211\u4f1a\u6301\u7eed\u66f4\u65b0\u76f8\u5173\u5185\u5bb9\u7684\uff0c\u5e0c\u671b\u90fd\u80fd\u5e2e\u5230\u6b63\u5728\u5b66\u4e60\u7684\u5927\u5bb6\uff01<\/p>\n

<\/p>\n

\u7edf\u8ba1\u8f6c\u6362\u5217\u7684\u6570\u636e<\/strong><\/p>\n

\u60f3\u8981\u7edf\u8ba1\u8f6c\u6362\u5217\u7684\u6570\u636e\uff0c\u53ef\u4ee5\u4f7f\u7528 pandas \u5e93\u4e2d\u7684 get_dummies() \u51fd\u6570\u5c06\u5206\u7c7b\u53d8\u91cf\u8f6c\u6362\u4e3a\u865a\u62df\u5217\uff0c\u7136\u540e\u4f7f\u7528 groupby() \u548c sum() \u51fd\u6570\u8fdb\u884c\u5206\u7ec4\u548c\u6c42\u548c\u3002<\/p>\n

\u4ee5\u4e0b\u4ee3\u7801\u5c55\u793a\u4e86\u6b64\u8fc7\u7a0b\uff1a<\/p>\n

import pandas as pd\n\ndf = pd.dataframe({\n    'date': ['2024-01-01', '2024-01-01', '2024-01-01', '2024-01-02', '2024-01-02', '2024-01-02', '2024-01-02', '2024-01-02', '2024-01-03', '2024-01-03', '2024-01-03', '2024-01-03'],\n    'type': [1, 2, 1, 3, 2, 3, 1, 1, 1, 4, 2, 5]\n})\n\ndf_dummies = pd.get_dummies(df, columns=['type'])\ndf_group = df_dummies.groupby(\"date\").sum()\n\nprint(df_dummies)\nprint(\"-\" * 60)\nprint(df_group)<\/pre>\n
\u8f93\u51fa\u7ed3\u679c\uff1a<\/p>\n
          date  type_1  type_2  type_3  type_4  type_5\n0   2024-01-01       1       0       0       0       0\n1   2024-01-01       0       1       0       0       0\n2   2024-01-01       1       0       0       0       0\n3   2024-01-02       0       0       1       0       0\n4   2024-01-02       0       1       0       0       0\n5   2024-01-02       0       0       1       0       0\n6   2024-01-02       1       0       0       0       0\n7   2024-01-02       1       0       0       0       0\n8   2024-01-03       1       0       0       0       0\n9   2024-01-03       0       0       0       1       0\n10  2024-01-03       0       1       0       0       0\n11  2024-01-03       0       0       0       0       1\n------------------------------------------------------------\n            type_1  type_2  type_3  type_4  type_5          \ndate                                                        \n2024-01-01       2       1       0       0       0          \n2024-01-02       2       1       2       0       0          \n2024-01-03       1       1       0       1       1 <\/pre>\n
\u597d\u4e86\uff0c\u672c\u6587\u5230\u6b64\u7ed3\u675f\uff0c\u5e26\u5927\u5bb6\u4e86\u89e3\u4e86\u300a\u5982\u4f55\u4f7f\u7528pandas\u7edf\u8ba1\u8f6c\u6362\u540e\u7684\u5217\u6570\u636e\uff1f\u300b\uff0c\u5e0c\u671b\u672c\u6587\u5bf9\u4f60\u6709\u6240\u5e2e\u52a9\uff01\u5173\u6ce8\u516c\u4f17\u53f7\uff0c\u7ed9\u5927\u5bb6\u5206\u4eab\u66f4\u591a\u6587\u7ae0\u77e5\u8bc6\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
\u5982\u4f55\u4f7f\u7528pandas\u7edf\u8ba1\u8f6c\u6362\u540e\u7684...<\/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-205329","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/205329","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=205329"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/205329\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=205329"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=205329"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=205329"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}