{"id":70590,"date":"2026-02-02T04:41:04","date_gmt":"2026-02-01T20:41:04","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/70590.html"},"modified":"2026-02-02T04:41:04","modified_gmt":"2026-02-01T20:41:04","slug":"rainfall-%ef%bc%9c400-%e5%92%8crainfallrainfall-%ef%bc%9c400%e7%9a%84%e5%8c%ba%e5%88%ab","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/70590.html","title":{"rendered":"rainfall \uff1c400 \u548crainfall[rainfall \uff1c400]\u7684\u533a\u522b"},"content":{"rendered":"

\u524d\u8a00<\/h2>\n

\u5728 pandas \u4e2d，rainfall < 400 \u548c rainfall[rainfall < 400] \u662f\u6570\u636e\u7b5b\u9009\u7684\u4e24\u4e2a\u6838\u5fc3\u6b65\u9aa4，\u524d\u8005\u751f\u6210\u5e03\u5c14\u63a9\u7801（\u5224\u65ad\u77e9\u9635），\u540e\u8005\u57fa\u4e8e\u8be5\u63a9\u7801\u5b9e\u73b0\u6570\u636e\u7b5b\u9009\u53d6\u503c，\u4e8c\u8005\u662f\u4f9d\u8d56\u5173\u7cfb（\u540e\u8005\u5fc5\u987b\u57fa\u4e8e\u524d\u8005\u624d\u80fd\u751f\u6548），\u6838\u5fc3\u533a\u522b\u548c\u4f7f\u7528\u903b\u8f91\u5982\u4e0b，\u7ed3\u5408\u4e4b\u524d\u7684\u964d\u96e8\u91cf DataFrame \u5b9e\u4f8b\u8bb2\u89e3\u66f4\u6613\u7406\u89e3\u3002
\n\u5148\u660e\u786e\u793a\u4f8b\u57fa\u7840（\u57fa\u4e8e\u63a8\u8350\u7684 2 \u884c 3 \u5217 DataFrame）
\n\u5148\u590d\u7528\u4fee\u6b63\u540e\u7684\u53ef\u8fd0\u884c\u4ee3\u7801，\u786e\u5b9a\u57fa\u7840\u6570\u636e\u7ed3\u6784，\u540e\u7eed\u6240\u6709\u5206\u6790\u57fa\u4e8e\u6b64：<\/p>\n

import<\/span> pandas as<\/span> pd
\nrainfall =<\/span> pd.<\/span>DataFrame(<\/span>
\n data=<\/span>{<\/span>
\n "City 1"<\/span>:<\/span> [<\/span>300.1<\/span>,<\/span> 100.2<\/span>]<\/span>,<\/span>
\n "City 2"<\/span>:<\/span> [<\/span>400.3<\/span>,<\/span> 300.4<\/span>]<\/span>,<\/span>
\n "City 3"<\/span>:<\/span> [<\/span>1000.5<\/span>,<\/span> 1100.6<\/span>]<\/span>
\n }<\/span>
\n)<\/span>
\nprint<\/span>(<\/span>rainfall)<\/span>
\n# \u57fa\u7840\u6570\u636e：2\u884c（\u884c\u7d22\u5f150\/1）\u30013\u5217（City1\/City2\/City3）<\/span>
\n# City 1 City 2 City 3<\/span>
\n# 0 300.1 400.3 1000.5<\/span>
\n# 1 100.2 300.4 1100.6<\/span><\/p>\n

\u4e00\u3001rainfall < 400：\u751f\u6210\u5e03\u5c14\u63a9\u7801（Boolean Mask）<\/h2>\n

\u6838\u5fc3\u4f5c\u7528
\n\u5bf9 DataFrame \u4e2d\u7684\u6bcf\u4e00\u4e2a\u5143\u7d20\u9010\u4e00\u8fdb\u884c\u300c\u662f\u5426\u5c0f\u4e8e 400\u300d\u7684\u5224\u65ad，\u8fd4\u56de\u4e00\u4e2a\u548c\u539f DataFrame \u884c\u5217\u7ed3\u6784\u5b8c\u5168\u4e00\u81f4\u7684\u65b0 DataFrame，\u5176\u4e2d\u6bcf\u4e2a\u4f4d\u7f6e\u7684\u503c\u53ea\u6709 True（\u6ee1\u8db3\u6761\u4ef6：<400）\u6216 False（\u4e0d\u6ee1\u8db3\u6761\u4ef6：\u2265400）\u2014\u2014 \u8fd9\u4e2a\u65b0\u7684\u5e03\u5c14\u578b DataFrame \u5c31\u662f\u5e03\u5c14\u63a9\u7801，\u4ec5\u7528\u4e8e\u300c\u6761\u4ef6\u5224\u65ad\u300d，\u4e0d\u76f4\u63a5\u8fd4\u56de\u539f\u6570\u636e\u3002<\/p>\n

print<\/span>(<\/span>rainfall <<\/span> 400<\/span>)<\/span>
\n# \u884c\u5217\u548c\u539f\u6570\u636e\u5b8c\u5168\u4e00\u81f4，\u4ec5\u5b58True\/False<\/span>
\n# City 1 City 2 City 3<\/span>
\n# 0 True False False<\/span>
\n# 1 True True False<\/span><\/p>\n

\u5173\u952e\u7279\u6027<\/p>\n

  • \u7ed3\u6784\u4e00\u81f4：\u884c\u6570\u3001\u5217\u6570\u3001\u7d22\u5f15 \/ \u5217\u540d\u548c\u539f DataFrame \u5b8c\u5168\u76f8\u540c，\u4e00\u4e00\u5bf9\u5e94；<\/li>\n
  • \u7c7b\u578b\u4e3a\u5e03\u5c14：\u6240\u6709\u503c\u90fd\u662f bool \u7c7b\u578b，\u65e0\u539f\u6570\u636e\u7684\u6570\u503c；<\/li>\n
  • \u4ec5\u505a\u5224\u65ad：\u4e0d\u7b5b\u9009\u3001\u4e0d\u63d0\u53d6\u539f\u6570\u636e，\u4ec5\u6807\u8bb0\u300c\u54ea\u4e9b\u4f4d\u7f6e\u6ee1\u8db3\u6761\u4ef6\u300d\u3002<\/li>\n

    \u4e8c\u3001rainfall[rainfall < 400]：\u57fa\u4e8e\u5e03\u5c14\u63a9\u7801\u7b5b\u9009\u5e76\u63d0\u53d6\u539f\u6570\u636e<\/h2>\n

    \u6838\u5fc3\u4f5c\u7528
    \n\u5c06 rainfall < 400 \u751f\u6210\u7684\u5e03\u5c14\u63a9\u7801\u4f5c\u4e3a\u884c \/ \u5217\u7b5b\u9009\u6761\u4ef6\u4f20\u5165\u539f DataFrame \u7684\u4e2d\u62ec\u53f7 []，\u5b9e\u73b0：
    \n\u5bf9\u539f DataFrame \u4e2d\u6bcf\u4e00\u4e2a\u4f4d\u7f6e，\u82e5\u63a9\u7801\u5bf9\u5e94\u4f4d\u7f6e\u4e3a True：\u4fdd\u7559\u539f\u6570\u636e\u7684\u6570\u503c；
    \n\u82e5\u63a9\u7801\u5bf9\u5e94\u4f4d\u7f6e\u4e3a False：\u7528 NaN（\u975e\u6570\u503c）\u586b\u5145，\u4ee3\u8868\u8be5\u4f4d\u7f6e\u4e0d\u6ee1\u8db3\u6761\u4ef6\u3002
    \n\u6700\u7ec8\u8fd4\u56de\u4e00\u4e2a\u548c\u539f DataFrame \u884c\u5217\u7ed3\u6784\u4ecd\u4e00\u81f4\u7684\u65b0 DataFrame，\u5176\u4e2d\u300c\u6ee1\u8db3\u6761\u4ef6\u7684\u4f4d\u7f6e\u4fdd\u7559\u539f\u6570\u503c，\u4e0d\u6ee1\u8db3\u7684\u4f4d\u7f6e\u4e3a NaN\u300d\u2014\u2014 \u8fd9\u662f pandas \u4e2d\u6309\u6761\u4ef6\u7b5b\u9009\u5143\u7d20\u7684\u6807\u51c6\u7528\u6cd5\u3002<\/p>\n

    print<\/span>(<\/span>rainfall[<\/span>rainfall <<\/span> 400<\/span>]<\/span>)<\/span>
    \n# \u884c\u5217\u7ed3\u6784\u4e0d\u53d8，\u6ee1\u8db3\u6761\u4ef6\u4fdd\u7559\u539f\u503c，\u4e0d\u6ee1\u8db3\u4e3aNaN<\/span>
    \n# City 1 City 2 City 3<\/span>
    \n# 0 300.1 NaN NaN<\/span>
    \n# 1 100.2 300.4 NaN<\/span><\/p>\n

    \u5173\u952e\u7279\u6027<\/h3>\n

    \u7ed3\u6784\u4e0d\u53d8：\u884c\u6570\u3001\u5217\u6570\u3001\u7d22\u5f15 \/ \u5217\u540d\u4ecd\u548c\u539f DataFrame \u4e00\u81f4；
    \n\u4fdd\u7559\u539f\u6570\u503c：\u6ee1\u8db3\u6761\u4ef6\u7684\u4f4d\u7f6e\u76f4\u63a5\u63d0\u53d6\u539f\u6570\u636e\u7684\u6570\u503c，\u7c7b\u578b\u4e0d\u53d8；
    \n\u4e0d\u6ee1\u8db3\u586b NaN：NaN \u662f pandas \u4e2d\u7f3a\u5931\u503c\u7684\u6807\u51c6\u8868\u793a，\u65b9\u4fbf\u540e\u7eed\u7f3a\u5931\u503c\u5904\u7406（\u5982\u5220\u9664\u3001\u586b\u5145）；
    \n\u4f9d\u8d56\u63a9\u7801：\u4e2d\u62ec\u53f7\u5185\u5fc5\u987b\u662f\u548c\u539f DataFrame \u884c\u5217\u7ed3\u6784\u4e00\u81f4\u7684\u5e03\u5c14\u63a9\u7801，\u5426\u5219\u4f1a\u62a5\u9519\u3002<\/p>\n

    \u4e09\u3001\u6838\u5fc3\u533a\u522b\u603b\u7ed3（\u8868\u683c\u5bf9\u6bd4，\u4e00\u76ee\u4e86\u7136）<\/h2>\n\n\u8868\u8fbe\u5f0f\u6838\u5fc3\u7c7b\u578b\u884c\u5217\u7ed3\u6784\u5b58\u50a8\u503c\u7c7b\u578b\u6838\u5fc3\u4f5c\u7528\u7ed3\u679c\u793a\u4f8b（City2 \u5217）<\/tr>\n\n\n\n
    rainfall < 400<\/td>\n\u5e03\u5c14\u578b DataFrame<\/td>\n\u548c\u539f\u6570\u636e\u4e00\u81f4<\/td>\nTrue\/False<\/td>\n\u751f\u6210\u6761\u4ef6\u5224\u65ad\u63a9\u7801<\/td>\n[False, True]<\/td>\n<\/tr>\n
    rainfall[rainfall < 400]<\/td>\n\u6570\u503c\u578b DataFrame（\u542b NaN）<\/td>\n\u548c\u539f\u6570\u636e\u4e00\u81f4<\/td>\n\u539f\u6570\u503c \/ NaN<\/td>\n\u57fa\u4e8e\u63a9\u7801\u7b5b\u9009\u63d0\u53d6\u539f\u6570\u636e<\/td>\n[NaN, 300.4]<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    \u56db\u3001\u62d3\u5c55：\u5982\u4f55\u63d0\u53d6\u300c\u4ec5\u6ee1\u8db3\u6761\u4ef6\u7684\u7eaf\u6570\u503c（\u65e0 NaN\u3001\u65e0\u7ed3\u6784）\u300d？<\/h2>\n

    \u5982\u679c\u9700\u8981\u53ea\u83b7\u53d6\u6240\u6709 < 400 \u7684\u6570\u503c，\u4e0d\u4fdd\u7559\u539f\u884c\u5217\u7ed3\u6784\u3001\u4e0d\u542b NaN，\u53ef\u5728\u63a9\u7801\u7b5b\u9009\u540e\u52a0 .dropna()（\u5220\u9664\u7f3a\u5931\u503c）\u6216 .stack()（\u5806\u53e0\u4e3a\u4e00\u7ef4），\u5e38\u7528\u5199\u6cd5：<\/p>\n

    # \u63d0\u53d6\u6240\u6709\u6ee1\u8db3\u6761\u4ef6\u7684\u6570\u503c，\u8fd4\u56de\u4e00\u7ef4Series<\/span>
    \nvalid_rain =<\/span> rainfall[<\/span>rainfall <<\/span> 400<\/span>]<\/span>.<\/span>stack(<\/span>)<\/span>
    \nprint<\/span>(<\/span>valid_rain)<\/span>
    \n# \u8f93\u51fa：\u4ec5\u4fdd\u7559\u6ee1\u8db3\u6761\u4ef6\u7684\u539f\u503c，\u5e26\u539f\u7d22\u5f15<\/span>
    \n# 0 City 1 300.1<\/span>
    \n# 1 City 1 100.2<\/span>
    \n# City 2 300.4<\/span>
    \n# dtype: float64<\/span><\/p>\n

    # \u8fdb\u4e00\u6b65\u8f6c\u4e3a\u7eaf\u5217\u8868<\/span>
    \nvalid_rain_list =<\/span> valid_rain.<\/span>tolist(<\/span>)<\/span>
    \nprint<\/span>(<\/span>valid_rain_list)<\/span> # [300.1, 100.2, 300.4]<\/span><\/p>\n

    \u4e94\u3001\u8bb0\u5fc6\u53e3\u8bc0<\/h2>\n

    \u5148\u5224\u65ad，\u540e\u7b5b\u9009；\u63a9\u7801\u662f\u524d\u63d0，\u53d6\u503c\u9760\u4e2d\u62ec\u53f7\u3002
    \nrainfall <<\/span> 400<\/span> \u2192 \u9010\u4e2a\u5224\u65ad\u6253\u6807\u7b7e（True<\/span>\/<\/span>False<\/span>）
    \nrainfall[<\/span>\u63a9\u7801]<\/span> \u2192 \u6309\u6807\u7b7e\u53d6\u503c（\u7559\u539f\u503c\/<\/span>\u586bNaN）<\/p>\n

    \u6700\u7ec8\u603b\u7ed3<\/h2>\n
  • rainfall < 400 \u662f\u6761\u4ef6\u5224\u65ad\u6b65\u9aa4，\u751f\u6210\u548c\u539f\u6570\u636e\u540c\u7ed3\u6784\u7684\u5e03\u5c14\u63a9\u7801，\u4ec5\u6807\u8bb0\u6ee1\u8db3\u6761\u4ef6\u7684\u4f4d\u7f6e，\u65e0\u539f\u6570\u503c；<\/li>\n
  • rainfall[rainfall < 400] \u662f\u6570\u636e\u63d0\u53d6\u6b65\u9aa4，\u57fa\u4e8e\u524d\u4e00\u6b65\u7684\u5e03\u5c14\u63a9\u7801，\u4ece\u539f\u6570\u636e\u4e2d\u7b5b\u9009\u63d0\u53d6\u6ee1\u8db3\u6761\u4ef6\u7684\u6570\u503c，\u4e0d\u6ee1\u8db3\u7684\u4f4d\u7f6e\u586b NaN，\u4fdd\u7559\u539f\u884c\u5217\u7ed3\u6784；<\/li>\n
  • \u4e8c\u8005\u662f\u5148\u540e\u4f9d\u8d56\u5173\u7cfb，\u540e\u8005\u5fc5\u987b\u4ee5\u524d\u8005\u751f\u6210\u7684\u5e03\u5c14\u63a9\u7801\u4e3a\u6761\u4ef6，\u662f pandas \u6309\u5143\u7d20\u6761\u4ef6\u7b5b\u9009\u7684\u6838\u5fc3\u7ec4\u5408\u7528\u6cd5；<\/li>\n
  • \u82e5\u9700\u7eaf\u6ee1\u8db3\u6761\u4ef6\u7684\u6570\u503c，\u53ef\u5728\u7b5b\u9009\u540e\u7528 .stack()\/.dropna() \u8fdb\u4e00\u6b65\u5904\u7406，\u53bb\u9664 NaN \u548c\u539f\u7ed3\u6784\u3002<\/li>\n","protected":false},"excerpt":{"rendered":"

    \u524d\u8a00
    \n\u5728 pandas \u4e2d，rainfall < 400 \u548c rainfall[rainfall < 400] \u662f\u6570\u636e\u7b5b\u9009\u7684\u4e24\u4e2a\u6838\u5fc3\u6b65\u9aa4，\u524d\u8005\u751f\u6210\u5e03\u5c14\u63a9\u7801（\u5224\u65ad\u77e9\u9635），\u540e\u8005\u57fa\u4e8e\u8be5\u63a9\u7801\u5b9e\u73b0\u6570\u636e\u7b5b\u9009\u53d6\u503c，\u4e8c\u8005\u662f\u4f9d\u8d56\u5173\u7cfb（\u540e\u8005\u5fc5\u987b\u57fa\u4e8e\u524d\u8005\u624d\u80fd\u751f\u6548），\u6838\u5fc3\u533a\u522b\u548c\u4f7f\u7528\u903b\u8f91\u5982\u4e0b，\u7ed3\u5408\u4e4b\u524d\u7684\u964d\u96e8\u91cf DataFrame \u5b9e\u4f8b\u8bb2\u89e3\u66f4\u6613\u7406\u89e3\u3002
    \n\u5148\u660e\u786e\u793a\u4f8b\u57fa\u7840<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[4278,81,62],"topic":[],"class_list":["post-70590","post","type-post","status-publish","format-standard","hentry","category-server","tag-pandas","tag-python","tag-62"],"yoast_head":"\nrainfall \uff1c400 \u548crainfall[rainfall \uff1c400]\u7684\u533a\u522b - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.wsisp.com\/helps\/70590.html\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"rainfall \uff1c400 \u548crainfall[rainfall \uff1c400]\u7684\u533a\u522b - \u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"og:description\" content=\"\u524d\u8a00 \u5728 pandas \u4e2d，rainfall < 400 \u548c rainfall[rainfall < 400] \u662f\u6570\u636e\u7b5b\u9009\u7684\u4e24\u4e2a\u6838\u5fc3\u6b65\u9aa4，\u524d\u8005\u751f\u6210\u5e03\u5c14\u63a9\u7801（\u5224\u65ad\u77e9\u9635），\u540e\u8005\u57fa\u4e8e\u8be5\u63a9\u7801\u5b9e\u73b0\u6570\u636e\u7b5b\u9009\u53d6\u503c，\u4e8c\u8005\u662f\u4f9d\u8d56\u5173\u7cfb（\u540e\u8005\u5fc5\u987b\u57fa\u4e8e\u524d\u8005\u624d\u80fd\u751f\u6548），\u6838\u5fc3\u533a\u522b\u548c\u4f7f\u7528\u903b\u8f91\u5982\u4e0b，\u7ed3\u5408\u4e4b\u524d\u7684\u964d\u96e8\u91cf DataFrame \u5b9e\u4f8b\u8bb2\u89e3\u66f4\u6613\u7406\u89e3\u3002 \u5148\u660e\u786e\u793a\u4f8b\u57fa\u7840\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.wsisp.com\/helps\/70590.html\" \/>\n<meta property=\"og:site_name\" content=\"\u7f51\u7855\u4e92\u8054\u5e2e\u52a9\u4e2d\u5fc3\" \/>\n<meta property=\"article:published_time\" content=\"2026-02-01T20:41:04+00:00\" \/>\n<meta name=\"author\" content=\"admin\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"admin\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.wsisp.com\/helps\/70590.html\",\"url\":\"https:\/\/www.wsisp.com\/helps\/70590.html\",\"name\":\"rainfall \uff1c400 \u548crainfall[rainfall \uff1c400]\u7684\u533a\u522b - 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