{"id":205134,"date":"2025-05-29T15:01:08","date_gmt":"2025-05-29T07:01:08","guid":{"rendered":"https:\/\/server.hk\/cnblog\/205134\/"},"modified":"2025-05-29T15:01:08","modified_gmt":"2025-05-29T07:01:08","slug":"%e5%a6%82%e4%bd%95%e5%88%a9%e7%94%a8%e4%b8%8a%e8%a1%8c%e6%9d%a1%e4%bb%b6%e5%8a%a8%e6%80%81%e6%b7%bb%e5%8a%a0%e6%96%b0%e5%88%97%e5%b9%b6%e7%b4%af%e5%8a%a0%e6%bb%a1%e8%b6%b3%e6%9d%a1%e4%bb%b6%e7%9a%84","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/205134\/","title":{"rendered":"\u5982\u4f55\u5229\u7528\u4e0a\u884c\u6761\u4ef6\u52a8\u6001\u6dfb\u52a0\u65b0\u5217\u5e76\u7d2f\u52a0\u6ee1\u8db3\u6761\u4ef6\u7684\u884c\u6570\uff1f"},"content":{"rendered":"

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

\u5982\u4f55\u5229\u7528\u4e0a\u884c\u6761\u4ef6\u52a8\u6001\u6dfb\u52a0\u65b0\u5217\u5e76\u7d2f\u52a0\u6ee1\u8db3\u6761\u4ef6\u7684\u884c\u6570\uff1f<\/h1>\n

\u5c0f\u4f19\u4f34\u4eec\u6709\u6ca1\u6709\u89c9\u5f97\u5b66\u4e60\u5f88\u6709\u610f\u601d\uff1f\u6709\u610f\u601d\u5c31\u5bf9\u4e86\uff01\u4eca\u5929\u5c31\u7ed9\u5927\u5bb6\u5e26\u6765\u300a\u5982\u4f55\u5229\u7528\u4e0a\u884c\u6761\u4ef6\u52a8\u6001\u6dfb\u52a0\u65b0\u5217\u5e76\u7d2f\u52a0\u6ee1\u8db3\u6761\u4ef6\u7684\u884c\u6570\uff1f\u300b<\/span>\uff0c\u4ee5\u4e0b\u5185\u5bb9\u5c06\u4f1a\u6d89\u53ca\u5230<\/span>\uff0c\u82e5\u662f\u5728\u5b66\u4e60\u4e2d\u5bf9\u5176\u4e2d\u90e8\u5206\u77e5\u8bc6\u70b9\u6709\u7591\u95ee\uff0c\u6216\u8bb8\u770b\u4e86\u672c\u6587\u5c31\u80fd\u5e2e\u5230\u4f60\uff01<\/p>\n

<\/p>\n

\u5982\u4f55\u5229\u7528\u4e0a\u884c\u6761\u4ef6\u589e\u52a0\u65b0\u5217<\/strong><\/p>\n

pandas \u4e2d\u53ef\u4ee5\u901a\u8fc7\u6761\u4ef6\u5224\u65ad\uff0c\u6839\u636e\u4e0a\u4e00\u884c\u7684\u503c\u52a8\u6001\u6dfb\u52a0\u65b0\u5217\u3002\u4ee5\u4e0b\u6b65\u9aa4\u4ecb\u7ecd\u5982\u4f55\u5b9e\u73b0\uff1a<\/p>\n

    \n
  1. \u9996\u5148\uff0c\u4f7f\u7528 lambda \u51fd\u6570\u5e94\u7528\u6761\u4ef6\u3002\u4f8b\u5982\uff0c\u8981\u6dfb\u52a0\u4e00\u5217\uff0c\u5176\u4e2d\u5f53\u4e0a\u884c\u7684\u503c\u5927\u4e8e 3 \u5c0f\u4e8e 5 \u65f6\u4e3a 1\uff0c\u5426\u5219\u4e3a 0\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u4ee3\u7801\uff1a<\/li>\n<\/ol>\n
    df['new_col'] = df.apply(lambda x: 1 if x['prev_col'] > 3 and x['prev_col'] < 5 else 0, axis=1)<\/pre>\n
    \u8fd9\u91cc\uff0cprev_col \u662f\u4e0a\u4e00\u4e2a\u503c\u4e0e\u4e4b\u8fdb\u884c\u6bd4\u8f83\u7684\u5217\u540d\u3002<\/p>\n
      \n
    1. \u5176\u6b21\uff0c\u901a\u8fc7 cumsum() \u7d2f\u52a0\u8be5\u5217\u7684\u503c\u3002\u8fd9\u53ef\u4ee5\u7528\u4e8e\u8ba1\u7b97\u8fde\u7eed\u6ee1\u8db3\u6761\u4ef6\u7684\u884c\u6570\uff1a<\/li>\n<\/ol>\n
      df['new_col_cumsum'] = df['new_col'].cumsum()<\/pre>\n
        \n
      1. \u6700\u540e\uff0c\u53ef\u4ee5\u4f7f\u7528\u586b\u5145\u6765\u91cd\u7f6e\u7d2f\u52a0\u540e\u7684\u503c\uff0c\u4ee5\u786e\u4fdd\u4ec5\u7d2f\u52a0\u8fde\u7eed\u6ee1\u8db3\u6761\u4ef6\u7684\u884c\u3002\u4f8b\u5982\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u4ee3\u7801\u5c06\u975e\u8fde\u7eed\u884c\u7684\u7d2f\u52a0\u503c\u91cd\u7f6e\u4e3a 0\uff1a<\/li>\n<\/ol>\n
        df['new_col_cumsum'] = df['new_col_cumsum'].fillna(0)<\/pre>\n
        \u901a\u8fc7\u9075\u5faa\u8fd9\u4e9b\u6b65\u9aa4\uff0c\u60a8\u53ef\u4ee5\u6709\u6548\u5730\u6839\u636e\u4e0a\u884c\u6761\u4ef6\u586b\u5145\u65b0\u5217\uff0c\u5e76\u7d2f\u52a0\u8fde\u7eed\u6ee1\u8db3\u6761\u4ef6\u7684\u884c\u6570\u3002<\/p>\n
        \u5230\u8fd9\u91cc\uff0c\u6211\u4eec\u4e5f\u5c31\u8bb2\u5b8c\u4e86\u300a\u5982\u4f55\u5229\u7528\u4e0a\u884c\u6761\u4ef6\u52a8\u6001\u6dfb\u52a0\u65b0\u5217\u5e76\u7d2f\u52a0\u6ee1\u8db3\u6761\u4ef6\u7684\u884c\u6570\uff1f\u300b\u7684\u5185\u5bb9\u4e86\u3002\u4e2a\u4eba\u8ba4\u4e3a\uff0c\u57fa\u7840\u77e5\u8bc6\u7684\u5b66\u4e60\u548c\u5de9\u56fa\uff0c\u662f\u4e3a\u4e86\u66f4\u597d\u7684\u5c06\u5176\u8fd0\u7528\u5230\u9879\u76ee\u4e2d\uff0c\u6b22\u8fce\u5173\u6ce8\u516c\u4f17\u53f7\uff0c\u5e26\u4f60\u4e86\u89e3\u66f4\u591a\u5173\u4e8e\u7684\u77e5\u8bc6\u70b9\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"
        \u5982\u4f55\u5229\u7528\u4e0a\u884c\u6761\u4ef6\u52a8\u6001\u6dfb\u52a0\u65b0\u5217\u5e76\u7d2f...<\/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-205134","post","type-post","status-publish","format-standard","hentry","category-4925"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/205134","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=205134"}],"version-history":[{"count":0,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/205134\/revisions"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=205134"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=205134"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=205134"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}