{"id":204863,"date":"2025-05-29T16:52:57","date_gmt":"2025-05-29T08:52:57","guid":{"rendered":"https:\/\/server.hk\/cnblog\/204863\/"},"modified":"2025-05-29T16:52:57","modified_gmt":"2025-05-29T08:52:57","slug":"pandas-%e5%a6%82%e4%bd%95%e8%8e%b7%e5%8f%96-dataframe-%e4%b8%ad%e6%af%94%e5%bd%93%e5%89%8d%e8%a1%8c%e5%80%bc%e5%a4%a7%e7%9a%84%e6%95%b0%e6%8d%ae%e4%b8%aa%e6%95%b0%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/204863\/","title":{"rendered":"Pandas \u5982\u4f55\u83b7\u53d6 DataFrame \u4e2d\u6bd4\u5f53\u524d\u884c\u503c\u5927\u7684\u6570\u636e\u4e2a\u6570\uff1f"},"content":{"rendered":"

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

Pandas \u5982\u4f55\u83b7\u53d6 DataFrame \u4e2d\u6bd4\u5f53\u524d\u884c\u503c\u5927\u7684\u6570\u636e\u4e2a\u6570\uff1f<\/h1>\n

\u4e00\u5206\u8015\u8018\uff0c\u4e00\u5206\u6536\u83b7\uff01\u65e2\u7136\u6253\u5f00\u4e86\u8fd9\u7bc7\u6587\u7ae0\uff0c\u5c31\u575a\u6301\u770b\u4e0b\u53bb\u5427\uff01\u6587\u4e2d\u5185\u5bb9\u5305\u542b<\/span>\u7b49\u7b49\u77e5\u8bc6\u70b9…\u5e0c\u671b\u4f60\u80fd\u5728\u9605\u8bfb\u672c\u6587\u540e\uff0c\u80fd\u771f\u771f\u5b9e\u5b9e\u5b66\u5230\u77e5\u8bc6\u6216\u8005\u5e2e\u4f60\u89e3\u51b3\u5fc3\u4e2d\u7684\u7591\u60d1\uff0c\u4e5f\u6b22\u8fce\u5927\u4f6c\u6216\u8005\u65b0\u4eba\u670b\u53cb\u4eec\u591a\u7559\u8a00\u8bc4\u8bba\uff0c\u591a\u7ed9\u5efa\u8bae\uff01\u8c22\u8c22\uff01<\/p>\n

<\/p>\n

pandas \u83b7\u53d6\u6bd4\u5f53\u524d\u884c\u503c\u5927\u7684\u6570\u636e\u4e2a\u6570<\/strong><\/p>\n

\u672c\u95ee\u9898\u8981\u6c42\u6211\u4eec\u4ece\u7ed9\u5b9a dataframe \u4e2d\u7684 col3 \u5217\u4e2d\uff0c\u67e5\u627e\u6bcf\u4e2a\u5f53\u524d\u884c\u503c\u5411\u4e0a\u5bfb\u627e\u5230\u7684\u7b2c\u4e00\u4e2a\u6bd4\u5f53\u524d\u503c\u5927\u7684\u503c\u7684\u7d22\u5f15\u4f4d\u7f6e\u3002<\/p>\n

\u4e00\u4e2a\u9ad8\u6548\u7684\u89e3\u51b3\u65b9\u6848\u662f\u5229\u7528 numpy \u7684\u77e9\u9635\u8fd0\u7b97\u3002\u5177\u4f53\u6b65\u9aa4\u5982\u4e0b\uff1a<\/p>\n

    \n
  1. \u5b9a\u4e49\u4e00\u4e2a lambda \u51fd\u6570 count_larger\uff0c\u7528\u4e8e\u8ba1\u7b97\u4e00\u4e2a\u6570\u7ec4\u4e2d\u6bd4\u5176\u6700\u540e\u4e00\u4e2a\u5143\u7d20\u5927\u7684\u5143\u7d20\u7684\u4e2a\u6570\u3002<\/li>\n
  2. \u4f7f\u7528\u5217\u8868\u89e3\u6790\u751f\u6210 col4 \u5217\u7684\u503c\uff0c\u5176\u4e2d i \u6807\u8bc6\u5f53\u524d\u884c\u7d22\u5f15\u3002<\/li>\n
  3. \u4f7f\u7528 lambda \u51fd\u6570 count_larger\uff0c\u5bf9 col3 \u5217\u4e2d\u4ece\u5f53\u524d\u884c\u5230\u5f00\u5934\uff08\u542b\u5f00\u5934\uff09\u7684\u5b50\u6570\u7ec4\u8fdb\u884c\u8ba1\u6570\u3002<\/li>\n<\/ol>\n
    import numpy as np\n\ndf['col4'] = [count_larger(df[:i + 1]['col3'].values) for i in range(len(df))]<\/pre>\n
    \u8f93\u51fa\uff1a<\/p>\n
        col1  col2  col3   col4\n0    5.5   2.5  10.0    0\n1    2.0   4.5   1.0     0\n2    2.5   5.2   8.0     1\n3    4.5   5.8   4.8      0\n4    4.6   6.3   9.6      3\n5    4.1   6.4   9.0      0\n6    5.1   2.3   3.0      0\n7    5.1   2.3  11.1      7\n8    5.1   2.3  10.0      0\n9    5.1   2.3  11.1      1\n10   5.1   2.3  20.0      10\n11   5.1   2.3  31.0       11\n12   5.1   2.3   5.0       0<\/pre>\n
    \u597d\u4e86\uff0c\u672c\u6587\u5230\u6b64\u7ed3\u675f\uff0c\u5e26\u5927\u5bb6\u4e86\u89e3\u4e86\u300aPandas \u5982\u4f55\u83b7\u53d6 DataFrame \u4e2d\u6bd4\u5f53\u524d\u884c\u503c\u5927\u7684\u6570\u636e\u4e2a\u6570\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":"
    Pandas \u5982\u4f55\u83b7\u53d6 Data...<\/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-204863","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/204863","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=204863"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/204863\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=204863"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=204863"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=204863"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}