{"id":473167,"date":"2024-05-13T04:26:35","date_gmt":"2024-05-13T03:26:35","guid":{"rendered":"https:\/\/blog.jetbrains.com\/?post_type=kotlin&#038;p=473167"},"modified":"2024-05-13T05:43:35","modified_gmt":"2024-05-13T04:43:35","slug":"a-step-by-step-guide-to-performing-data-analysis-with-kotlin-dataframe","status":"publish","type":"kotlin","link":"https:\/\/blog.jetbrains.com\/zh-hans\/kotlin\/2024\/05\/a-step-by-step-guide-to-performing-data-analysis-with-kotlin-dataframe\/","title":{"rendered":"\u4f7f\u7528 Kotlin DataFrame \u6267\u884c\u6570\u636e\u5206\u6790\u7684\u5206\u6b65\u6307\u5357"},"content":{"rendered":"<figure class=\"wp-block-image size-full\"><\/figure>\n<h2 class=\"wp-block-heading\">\u7b80\u4ecb<\/h2>\n<p>\u6211\u4eec\u5c06\u5229\u7528\u4e00\u4e2a\u6559\u7a0b\u7cfb\u5217\u4ecb\u7ecd\u5982\u4f55\u4f7f\u7528 <a href=\"https:\/\/github.com\/Kotlin\/dataframe\" target=\"_blank\" rel=\"noreferrer noopener\">Kotlin DataFrame \u548c Kandy \u5e93<\/a>\u8f7b\u677e\u64cd\u4f5c\u548c\u76f4\u89c2\u5448\u73b0\u6570\u636e\uff0c\u8fd9\u662f\u7cfb\u5217\u7684\u7b2c\u4e00\u90e8\u5206\u3002 \u6559\u7a0b\u9762\u5411\u666e\u901a Kotlin \u5f00\u53d1\u8005\uff0c\u56e0\u6b64\u60a8\u4e0d\u9700\u8981\u5177\u5907\u6570\u636e\u5206\u6790\u6216\u7c7b\u4f3c\u6846\u67b6\uff08\u5982 pandas \u6216 Apache Spark\uff09\u7684\u7ecf\u9a8c\u3002 \u4e0d\u8fc7\uff0c\u60a8\u5e94\u8be5\u719f\u6089 Kotlin \u8bed\u8a00\uff0c\u5e76\u4e14\u5df2\u7ecf\u5728 IntelliJ IDEA \u4e2d\u521b\u5efa\u8fc7\u57fa\u4e8e Kotlin \u7684\u9879\u76ee\u3002<\/p>\n<p>\u5728\u672c\u6559\u7a0b\u4e2d\uff0c\u60a8\u5c06\u5b66\u4e60\uff1a<\/p>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul>\n<li style=\"list-style-type: none;\">\n<ul>\n<li>\u5982\u4f55\u4ece CSV \u6587\u4ef6\u521b\u5efa DataFrame\u3002<\/li>\n<li>\u5982\u4f55\u6267\u884c\u5e38\u89c1\u64cd\u4f5c\u3002<\/li>\n<li>\u5982\u4f55\u663e\u793a\u6216\u5bfc\u51fa\u7ed3\u679c\u3002\u00a0<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>\u60a8\u5c06\u5728 <a href=\"https:\/\/blog.jetbrains.com\/kotlin\/2023\/07\/introducing-kotlin-notebook\/\" target=\"_blank\" rel=\"noreferrer noopener\">Kotlin Notebook<\/a> \u4e2d\u5de5\u4f5c\uff0c\u65e2\u65b9\u4fbf\u53c8\u80fd\u8bbf\u95ee <a href=\"https:\/\/github.com\/Kotlin\/kandy\" target=\"_blank\" rel=\"noreferrer noopener\">Kandy \u7ed8\u56fe\u5e93<\/a>\u3002 \u60a8\u5c06\u770b\u5230\u7684\u6838\u5fc3 DataFrame \u529f\u80fd\u5728\u57fa\u4e8e Gradle \u7684\u9879\u76ee\u4e2d\u53ef\u7528\u3002<\/p>\n<p>\u60a8\u53ef\u4ee5\u76f4\u63a5\u8df3\u8f6c\u5230<a href=\"https:\/\/github.com\/garthgilmourni\/dataframe-blogs\" target=\"_blank\" rel=\"noreferrer noopener\">\u793a\u4f8b\u9879\u76ee<\/a>\uff0c\u5176\u4e2d\u5305\u542b\u672c\u7cfb\u5217\u6240\u6709\u6559\u7a0b\u7684\u6570\u636e\u6587\u4ef6\u548c Notebook\u3002 \u4e0d\u8fc7\uff0c\u521a\u63a5\u89e6 DataFrame \u7684\u5f00\u53d1\u8005\u6700\u597d\u4ece\u5934\u5f00\u59cb\uff0c\u4e00\u6b65\u4e00\u6b65\u81ea\u5df1\u52a8\u624b\u6784\u5efa\u3002 \u7136\u540e\uff0c\u60a8\u53ef\u4ee5\u5c06\u60a8\u7684\u9879\u76ee\u4e0e\u793a\u4f8b\u9879\u76ee\u8fdb\u884c\u6bd4\u8f83\uff0c\u786e\u4fdd\u6784\u5efa\u6b63\u786e\u3002<\/p>\n<p>\u6240\u6709\u6559\u7a0b\u90fd\u4f7f\u7528\u771f\u5b9e\u4e16\u754c\u6570\u636e\uff0c\u5728\u672c\u4f8b\u4e2d\uff0c\u5305\u542b Stack Overflow \u4e0a\u6392\u540d\u6700\u9760\u524d\u56de\u7b54\u8005\u7684\u4fe1\u606f\u3002 \u8bf7\u6ce8\u610f\uff0c\u4e0b\u9762\u663e\u793a\u7684\u7ed3\u679c\u5bf9\u4e8e\u64b0\u5199\u672c\u6587\u65f6\u4e0b\u8f7d\u7684\u6570\u636e\u4ee5\u53ca\u793a\u4f8b\u9879\u76ee\u4e2d\u5305\u542b\u7684\u6570\u636e\u662f\u6b63\u786e\u7684\u3002 \u5982\u679c\u60a8\u83b7\u53d6\u7684\u662f\u65b0\u9c9c\u6570\u636e\uff0c\u90a3\u4e48\u5176\u4e2d\u81ea\u7136\u53ef\u80fd\u5305\u542b\u66f4\u65b0\u7684\u503c\u3002<\/p>\n<h2 class=\"wp-block-heading\">\u793a\u4f8b\u6570\u636e<\/h2>\n<p>\u60a8\u53ef\u4ee5\u901a\u8fc7 <a href=\"https:\/\/data.stackexchange.com\/\" target=\"_blank\" rel=\"noreferrer noopener\">StackExchange Data Explorer<\/a> \u83b7\u53d6\u793a\u4f8b\u6570\u636e\u3002 \u8fd9\u6837\u4e00\u6765\uff0c\u60a8\u53ef\u4ee5\u9488\u5bf9\u4e00\u7cfb\u5217\u95ee\u7b54\u7f51\u7ad9\uff08\u5305\u62ec Stack Overflow\uff09\u8fd0\u884c\u793a\u4f8b\u67e5\u8be2\u3002 \u67e5\u8be2\u7684\u7ed3\u679c\u53ef\u4ee5\u4f5c\u4e3a CSV \u6587\u4ef6\u4e0b\u8f7d\u3002<\/p>\n<p><a href=\"https:\/\/data.stackexchange.com\/stackoverflow\/query\/952\/top-500-answerers-on-the-site\" target=\"_blank\" rel=\"noreferrer noopener\">\u8fd9\u4e2a\u793a\u4f8b\u67e5\u8be2<\/a>\u57fa\u4e8e\u95ee\u9898\u56de\u7b54\u8ba1\u7b97\u51fa\u7684\u5e73\u5747\u5206\u6570\u9009\u62e9 Stack Overflow \u4e0a\u6392\u540d\u524d 500 \u7684\u7528\u6237\u3002 \u4f7f\u7528 <em>Run Query<\/em>\uff08\u8fd0\u884c\u67e5\u8be2\uff09\u6309\u94ae\u6267\u884c\u67e5\u8be2\uff0c\u7136\u540e\u901a\u8fc7 <em>Download CSV<\/em>\uff08\u4e0b\u8f7d CSV\uff09\u94fe\u63a5\u4fdd\u5b58\u7ed3\u679c\uff1a<\/p>\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" loading=\"lazy\" class=\"wp-image-468479\" src=\"https:\/\/blog.jetbrains.com\/wp-content\/uploads\/2024\/04\/image-49.png\" alt=\"\u7f51\u7ad9\u793a\u4f8b\u6570\u636e\u4e0a\u7684 StackExchange \u6392\u540d\u524d 500 \u7684\u56de\u7b54\" width=\"1600\" height=\"1323\" \/><\/figure>\n<p>\u4e0b\u8f7d\u6587\u4ef6\u540e\uff0c\u5c06\u5176\u4fdd\u5b58\u4e3a Top500Answerers.csv\u3002<\/p>\n<h2 class=\"wp-block-heading\">\u521b\u5efa\u60a8\u7684\u9879\u76ee<\/h2>\n<p>\u6253\u5f00 IntelliJ IDEA \u5e76\u5b89\u88c5 Kotlin Notebook \u63d2\u4ef6\uff0c<a href=\"https:\/\/blog.jetbrains.com\/kotlin\/2023\/07\/introducing-kotlin-notebook\/\" target=\"_blank\" rel=\"noreferrer noopener\">\u5982\u8fd9\u7bc7\u535a\u6587\u6240\u8ff0<\/a>\u3002 \u7136\u540e\uff0c\u4f7f\u7528 <a href=\"https:\/\/www.jetbrains.com\/help\/idea\/new-project-wizard.html\" target=\"_blank\" rel=\"noreferrer noopener\"><em>New Project<\/em>\uff08\u65b0\u5efa\u9879\u76ee\uff09\u5411\u5bfc<\/a>\u521b\u5efa\u4e00\u4e2a\u65b0\u7684 Kotlin \u9879\u76ee\uff0c\u5e76\u4f7f\u7528 Gradle \u4f5c\u4e3a\u6784\u5efa\u5de5\u5177\u3002\u00a0<\/p>\n<p>\u5c06\u60a8\u5728\u4e0a\u4e00\u8282\u4e2d\u521b\u5efa\u7684 CSV \u6587\u4ef6\u590d\u5236\u5230 src\/main\/resources \u4e2d\u3002 \u60a8\u5e94\u8be5\u80fd\u591f\u5728\u6587\u672c\u6216\u6570\u636e\u89c6\u56fe\u4e2d\u6253\u5f00\u8be5\u6587\u4ef6\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" loading=\"lazy\" class=\"wp-image-468490\" src=\"https:\/\/blog.jetbrains.com\/wp-content\/uploads\/2024\/04\/image-50.png\" alt=\"Kotlin Notebook \u63d2\u4ef6\uff1a\u5728 IntelliJ IDEA \u4e2d\u6253\u5f00 CSV \u6587\u4ef6\" width=\"1600\" height=\"1034\" \/><\/figure>\n<h2 class=\"wp-block-heading\">\u4f60\u597d\uff0cDataFrame\uff01<\/h2>\n<p>\u53f3\u952e\u70b9\u51fb\u9879\u76ee\u540d\u79f0\u5e76\u9009\u62e9 <em>New | Kotlin Notebook<\/em>\uff08\u65b0\u5efa | Kotlin Notebook\uff09\u3002 \u60a8\u53ef\u4ee5\u968f\u610f\u547d\u540d\u5e76\u4fdd\u5b58\u6587\u4ef6\u3002 \u7136\u540e\uff0c\u6dfb\u52a0\u5e76\u8fd0\u884c\u4ee5\u4e0b\u4e24\u884c\uff1a<\/p>\n<pre class=\"EnlighterJSRAW\">%useLatestDescriptors\n\n%use dataframe<\/pre>\n<p>use \u547d\u4ee4\u5c06\u4e3a\u60a8\u52a0\u8f7d\u5e76\u521d\u59cb\u5316 Kotlin DataFrame \u5e93\u3002 \u8bb8\u591a\u70ed\u95e8\u5e93\u53ef\u4ee5\u4ec5\u4f7f\u7528\u540d\u79f0\u52a0\u8f7d\uff0c\u5176\u4ed6\u5e93\u53ef\u4ee5\u6839\u636e\u5176 Maven \u5750\u6807\u52a0\u8f7d\u3002 \u52a0\u8f7d\u5e93\u65f6\u53ef\u80fd\u4f1a\u53d1\u751f\u5f88\u591a\u4e8b\u60c5\uff0c\u56e0\u6b64\u6700\u597d\u5728\u5355\u72ec\u7684\u5355\u5143\u4e2d\u6267\u884c\u6b64\u64cd\u4f5c\u3002<\/p>\n<p>\u73b0\u5728\uff0c\u60a8\u53ef\u4ee5\u521b\u5efa\u4e00\u4e2a\u65b0\u5355\u5143\u5e76\u6dfb\u52a0\u4ee5\u4e0b\u4e09\u884c\uff1a<\/p>\n<pre class=\"EnlighterJSRAW\">val path = \".\/src\/main\/resources\/Top500Answerers.csv\"\n\nval topFolks = DataFrame.read(path)\n\ntopFolks.head()<\/pre>\n<p>\u8fd0\u884c\u540e\uff0c\u8f93\u51fa\u5e94\u7c7b\u4f3c\u4e8e\u4ee5\u4e0b\u793a\u4f8b\uff1a<\/p>\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" loading=\"lazy\" class=\"wp-image-468501\" src=\"https:\/\/blog.jetbrains.com\/wp-content\/uploads\/2024\/04\/No1-Top5Users.png\" alt=\"\" width=\"1716\" height=\"560\" \/><\/figure>\n<p>\u606d\u559c\uff01 \u60a8\u5df2\u7ecf\u6210\u529f\u4ece CSV \u6587\u4ef6\u6784\u5efa\u4e86\u4e00\u4e2a DataFrame \u5e76\u6253\u5370\u51fa\u524d 5 \u6761\u8bb0\u5f55\u3002<\/p>\n<h2 class=\"wp-block-heading\">\u5728 Kotlin Notebook \u4e2d\u663e\u793a\u6570\u636e<\/h2>\n<p>\u6709\u4e86\u6570\u636e\uff0c\u6211\u4eec\u6765\u8003\u8651\u5982\u4f55\u5728 Kotlin Notebook \u4e2d\u663e\u793a\u3002<\/p>\n<p>\u60a8\u53ef\u4ee5\u901a\u8fc7 DISPLAY \u548c HTML \u51fd\u6570\u5c06\u5185\u5bb9\u4f5c\u4e3a\u6807\u8bb0\u5448\u73b0\u3002 \u4ee5\u4e0b\u793a\u4f8b\u4f1a\u5bf9\u7528\u6237\u8fdb\u884c\u6392\u5e8f\uff0c\u53d6\u524d\u4e94\u4f4d\uff0c\u5e76\u4ee5 HTML \u5217\u8868\u7684\u5f62\u5f0f\u6253\u5370\u5176\u8be6\u7ec6\u4fe1\u606f\uff1a<\/p>\n<pre class=\"enlighter-clipboard\">fun htmlLink(text: String, url: String) = \"&lt;a href=\\\"$url\\\"&gt;$text&lt;\/a&gt;\"\nfun soUrl(userID: String) = \"https:\/\/stackoverflow.com\/users\/$userID\"\n\nval topFive = topFolks\n   .sortBy { `Average Answer Score` }\n   .tail()\n   .reverse()\n\nval content = buildString {\n   append(\"&lt;ul&gt;\")\n   topFive.forEach {\n       val userID = `User Link`.toString()\n       val average = `Average Answer Score`\n       val linkMarkup = htmlLink(userID, soUrl(userID))\n       append(\"&lt;li&gt;User $linkMarkup with an average of $average&lt;\/li&gt;\")\n   }\n   append(\"&lt;\/ul&gt;\")\n}\n\nDISPLAY(HTML(content))<\/pre>\n<p>\u7ed3\u679c\u5e94\u8be5\u663e\u793a\u4e3a\uff1a<\/p>\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" loading=\"lazy\" class=\"wp-image-468512\" src=\"https:\/\/blog.jetbrains.com\/wp-content\/uploads\/2024\/04\/No2-Top5UsersAsHTML.png\" alt=\"\" width=\"562\" height=\"212\" \/><\/figure>\n<p>\u60a8\u5e94\u8be5\u80fd\u591f\u70b9\u51fb\u94fe\u63a5\u5e76\u5728\u6d4f\u89c8\u5668\u4e2d\u6253\u5f00\u7279\u5b9a\u8d21\u732e\u8005\u7684\u9875\u9762\u3002<\/p>\n<p>\u4ee5 HTML \u5f62\u5f0f\u663e\u793a\u6570\u636e\u867d\u7136\u5b9e\u7528\uff0c\u4f46\u4e0d\u592a\u5bb9\u6613\u4ea7\u751f\u7f8e\u89c2\u7684\u7ed3\u679c\u3002 \u66f4\u7b80\u5355\u7684\u65b9\u6cd5\u662f\u5229\u7528 <a href=\"https:\/\/github.com\/Kotlin\/kandy\" target=\"_blank\" rel=\"noopener\">Kandy \u5e93<\/a>\u76f4\u89c2\u5448\u73b0\u6570\u636e\u3002 \u6211\u4eec\u4f7f\u7528\u6761\u5f62\u56fe\u5c55\u793a\u6392\u540d\u524d\u4e94\u4f4d\u7684\u8d21\u732e\u8005\u3002<\/p>\n<p>\u9996\u5148\uff0c\u5728\u5355\u72ec\u7684\u5355\u5143\u4e2d\u52a0\u8f7d Kandy \u5e93\uff08\u51fa\u4e8e\u4e0a\u9762\u8ba8\u8bba\u7684\u539f\u56e0\uff09\uff1a<\/p>\n<pre class=\"EnlighterJSRAW\">%use kandy<\/pre>\n<p>\u7136\u540e\uff0c\u7ed8\u51fa\u8d21\u732e\u8005\uff0cx \u8f74\u4e3a\u7528\u6237 ID\uff0cy \u8f74\u4e3a\u5e73\u5747\u56de\u7b54\uff1a<\/p>\n<pre class=\"enlighter-clipboard\">plot {\n   bars {\n       x(topFive.map { \"ID: $`User Link`\" })\n       y(topFive.map { `Average Answer Score` })\n   }\n}<\/pre>\n<p>\u7ed3\u679c\u5e94\u8be5\u663e\u793a\u4e3a\uff1a<\/p>\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" loading=\"lazy\" class=\"wp-image-468523\" src=\"https:\/\/blog.jetbrains.com\/wp-content\/uploads\/2024\/04\/No3-Top5UsersAsKandy.png\" alt=\"\u4f7f\u7528 DataFrame \u5e93\u663e\u793a\u56fe\u8868\" width=\"1232\" height=\"802\" \/><\/figure>\n<p>\u7ed3\u679c\u5f88\u597d\uff0c\u8fc7\u7a0b\u4e5f\u76f8\u5bf9\u8f7b\u677e\u3002 \u73b0\u5728\uff0c\u60a8\u5df2\u7ecf\u4e86\u89e3\u4e86 DataFrame \u5e93\u7684\u5f3a\u5927\u529f\u80fd\uff0c\u6211\u4eec\u9000\u4e00\u6b65\u56de\u987e\u4e00\u4e9b\u6838\u5fc3\u6982\u5ff5\u3002<\/p>\n<h2 class=\"wp-block-heading\">\u4ec0\u4e48\u662f DataFrame\uff1f<\/h2>\n<p>DataFrame \u662f\u7528\u4e8e\u5904\u7406\u7ed3\u6784\u5316\u6570\u636e\u7684\u62bd\u8c61\u3002 \u5b83\u662f\u4ece CSV \u6587\u4ef6\u3001JSON \u6587\u6863\u6216\u6570\u636e\u5e93\u7b49\u6e90\u8bfb\u53d6\u540e\u521b\u5efa\u7684\u8868\u3002 DataFrame \u5305\u542b\u4e00\u4e2a\u6216\u591a\u4e2a\u547d\u540d\u5217\uff0c\u5176\u5185\u5bb9\u53ef\u4ee5\u662f\u4e0d\u540c\u7684\u7c7b\u578b\u3002\u00a0<\/p>\n<p>\u5217\u7684\u5185\u5bb9\u53ef\u4ee5\u662f\u4efb\u4f55 Kotlin \u5bf9\u8c61\uff0c\u5305\u62ec\u53e6\u4e00\u4e2a DataFrame\u3002 \u8fd9\u9879\u7279\u6027\u8ba9\u60a8\u53ef\u4ee5\u5b58\u50a8\u548c\u64cd\u4f5c<a href=\"https:\/\/kotlin.github.io\/dataframe\/hierarchical.html\" target=\"_blank\" rel=\"noreferrer noopener\">\u5206\u5c42\u6570\u636e<\/a>\u3002<\/p>\n<p><a href=\"https:\/\/kotlin.github.io\/dataframe\/operations.html\" target=\"_blank\" rel=\"noreferrer noopener\">DataFrame API<\/a> \u80fd\u591f\u5b9e\u73b0\u51fd\u6570\u5f0f\u7a0b\u5e8f\u5458\u6216\u6570\u636e\u5e93\u7ba1\u7406\u5458\u53ef\u80fd\u9700\u8981\u7684\u6240\u6709\u64cd\u4f5c\u3002 API \u4e0d\u53ef\u53d8\uff0c\u56e0\u6b64\u4efb\u4f55\u6709\u53ef\u80fd\u66f4\u6539 DataFrame \u7684\u64cd\u4f5c\u90fd\u4f1a\u751f\u6210\u4e00\u4e2a\u65b0\u5b9e\u4f8b\u3002 \u5e95\u5c42\u6570\u636e\u5c3d\u53ef\u80fd\u5f97\u5230\u91cd\u7528\uff0c\u7531\u6b64\u63d0\u9ad8\u6548\u7387\u548c\u6027\u80fd\u3002<\/p>\n<p>Kotlin DataFrame \u5e93\u7684\u6700\u5927\u4f18\u52bf\u4e4b\u4e00\u662f\u5176\u7c7b\u578b\u5b89\u5168\u6027\u3002 \u60a8\u53ef\u4ee5\u751f\u6210\u4e0e DataFrame \u4e2d\u7684\u5217\u5bf9\u5e94\u7684\u5f3a\u7c7b\u578b\u6269\u5c55\u5c5e\u6027\u3002 \u6211\u4eec\u5c06\u5728\u4e0b\u4e00\u8282\u4e2d\u8be6\u7ec6\u63a2\u8ba8\u3002\u00a0<\/p>\n<p>\u8bf7\u6ce8\u610f\uff0c<strong>\u5728 Kotlin Notebook \u4e2d\u5de5\u4f5c\u65f6\uff0c\u8fd9\u4e9b\u5c5e\u6027\u662f\u52a8\u6001\u521b\u5efa\u7684<\/strong>\u3002\u00a0<\/p>\n<h2 class=\"wp-block-heading\">\u5728 DataFrame \u4e2d\u8bbf\u95ee\u503c<\/h2>\n<p>DataFrame \u7684\u597d\u5904\u662f\uff0c\u5982\u679c\u60a8\u4ee5\u524d\u4f7f\u7528\u8fc7 Kotlin \u96c6\u5408\u6216\u5176\u4ed6\u73b0\u4ee3\u6570\u636e\u7ed3\u6784\u5e93\uff0c\u60a8\u5c31\u53ef\u4ee5\u7acb\u5373\u4e0a\u624b\u3002 \u51fd\u6570\u5f0f\u7f16\u7a0b\u7684\u6240\u6709\u6807\u51c6\u8fd0\u7b97\u7b26\u90fd\u4f1a\u6309\u9884\u671f\u5de5\u4f5c\uff0c\u5f00\u7bb1\u5373\u7528\u3002<\/p>\n<p>\u6211\u4eec\u5c06\u6240\u6709\u8d21\u732e\u8005\u7684\u56de\u7b54\u603b\u6570\u76f8\u52a0\u3002 \u6dfb\u52a0\u5e76\u8fd0\u884c\u5305\u542b\u4ee5\u4e0b\u8868\u8fbe\u5f0f\u7684\u65b0\u4ee3\u7801\u5355\u5143\uff1a<\/p>\n<pre class=\"EnlighterJSRAW\">topFolks.map { Answers }.sum()<\/pre>\n<p>\u60a8\u53ef\u4ee5\u4f7f\u7528\u719f\u6089\u7684 <a href=\"https:\/\/kotlin.github.io\/dataframe\/map.html\" target=\"_blank\" rel=\"noreferrer noopener\">map<\/a> \u548c <a href=\"https:\/\/kotlin.github.io\/dataframe\/sum.html\" target=\"_blank\" rel=\"noreferrer noopener\">sum<\/a> \u8fd0\u7b97\u8ba1\u7b97\u603b\u6570\u3002 \u51fa\u4e8e\u6f14\u793a\u76ee\u7684\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528\u901a\u7528\u7684\u5f52\u7ea6\u8fd0\u7b97\u7b26\uff1a<\/p>\n<pre class=\"EnlighterJSRAW\">topFolks.map { Answers }.reduce { a, b -&gt; a + b }<\/pre>\n<p>\u8fd9\u5e94\u8be5\u4f1a\u5f97\u5230\u4e0e\u4e4b\u524d\u76f8\u540c\u7684\u7ed3\u679c\u3002 \u5982\u524d\u6240\u8ff0\uff0cCSV \u6587\u4ef6\u4e2d\u6bcf\u4e2a\u5b57\u6bb5\u7684\u5c5e\u6027\u90fd\u5df2\u6dfb\u52a0\u5230 DataFrame \u4e2d\u3002 \u8fd9\u4e9b\u6269\u5c55\u5c5e\u6027\u7b80\u5316\u4e86\u4ee5\u7c7b\u578b\u5b89\u5168\u65b9\u5f0f\u5bf9\u6570\u636e\u7684\u8bbf\u95ee\u548c\u64cd\u4f5c\u3002<\/p>\n<p>\u6839\u636e\u9700\u8981\uff0c\u60a8\u53ef\u4ee5\u5728\u6ca1\u6709\u8fd9\u4e9b\u6269\u5c55\u5c5e\u6027\u7684\u60c5\u51b5\u4e0b\u8fdb\u884c\u7ba1\u7406\uff0c\u4f8b\u5982\u521b\u5efa\u5217\u8bbf\u95ee\u5668\u51fd\u6570\uff1a<\/p>\n<pre class=\"EnlighterJSRAW\">val Answers by column()\n\ntopFolks.map { Answers() }.sum()<\/pre>\n<h2 class=\"wp-block-heading\">DataFrame \u7684\u6807\u51c6\u64cd\u4f5c<\/h2>\n<p>\u63a2\u7d22\u5176\u4ed6\u5185\u7f6e\u64cd\u4f5c\u4e4b\u524d\uff0c\u6211\u4eec\u5e94\u8be5\u5148\u6e05\u7406\u4e00\u4e0b\u6570\u636e\u3002 \u4e3a\u4e86\u6e05\u6670\u548c\u65b9\u4fbf\uff0c\u60a8\u53ef\u4ee5\u91cd\u547d\u540d\u6700\u540e\u4e24\u5217\uff1a<\/p>\n<pre class=\"EnlighterJSRAW\">val topFolksClean = topFolks\n\u00a0\u00a0\u00a0.rename { `Average Answer Score` }.into(\"AverageScore\")\n\u00a0\u00a0\u00a0.rename { `User Link` }.into(\"UserID\")\n\ntopFolksClean<\/pre>\n<p>\u60a8\u5e94\u8be5\u53ef\u4ee5\u770b\u5230\u5217\u540d\u79f0\u5df2\u7ecf\u66f4\u6539\uff1a<\/p>\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" loading=\"lazy\" class=\"wp-image-468534\" src=\"https:\/\/blog.jetbrains.com\/wp-content\/uploads\/2024\/04\/No4-Top5Renamed.png\" alt=\"\" width=\"1718\" height=\"688\" \/><\/figure>\n<p>\u73b0\u5728\uff0c\u8f93\u5165\u5e76\u8fd0\u884c\u4ee5\u4e0b\u8868\u8fbe\u5f0f\uff1a<\/p>\n<pre class=\"EnlighterJSRAW\">topFolksClean\n\u00a0\u00a0\u00a0.filter { Answers &gt;= 20 }\n\u00a0\u00a0\u00a0.sortBy { AverageScore }\n\u00a0\u00a0\u00a0.tail(3)\n\u00a0\u00a0\u00a0.select { UserID }<\/pre>\n<p>\u6b63\u5982\u60a8\u6240\u770b\u5230\u7684\uff0c\u60a8\u83b7\u5f97\u4e00\u4e2a\u64cd\u4f5c\u94fe\uff0c\u5305\u542b\u4ee5\u4e0b\u64cd\u4f5c\uff1a<\/p>\n<ul>\n<li style=\"list-style-type: none;\">\n<ul>\n<li style=\"list-style-type: none;\">\n<ul>\n<li>\u7b5b\u9009\u8bb0\u5f55\u4ee5\u4ec5\u5305\u542b\u56de\u7b54\u4e86 20 \u4e2a\u6216\u66f4\u591a\u95ee\u9898\u7684\u8d21\u732e\u8005\u3002<\/li>\n<li>\u4f7f\u7528 <a href=\"https:\/\/kotlin.github.io\/dataframe\/sortby.html\" target=\"_blank\" rel=\"noreferrer noopener\">sortBy<\/a> \u5c06\u5269\u4f59\u8bb0\u5f55\u6309\u5e73\u5747\u5206\u5347\u5e8f\u6392\u5e8f\u3002<\/li>\n<li>\u53d6\u524d\u4e09\u4e2a\u7ed3\u679c\uff0c\u8fd9\u4e9b\u7ed3\u679c\u5c06\u4f4d\u4e8e\u6392\u5e8f\u540e\u7684 DataFrame \u7684\u672b\u5c3e\u3002<\/li>\n<li>\u5c06\u8d21\u732e\u8005\u7684 ID \u63d0\u53d6\u5230\u6700\u7ec8 DataFrame \u4e2d\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>\u60a8\u7684\u8f93\u51fa\u5e94\u7c7b\u4f3c\u4e8e\uff1a<\/p>\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" loading=\"lazy\" class=\"wp-image-468545\" src=\"https:\/\/blog.jetbrains.com\/wp-content\/uploads\/2024\/04\/No5-Top3Over20.png\" alt=\"\" width=\"1718\" height=\"420\" \/><\/figure>\n<p>\u5982\u679c\u60a8\u719f\u6089 SQL\uff0c\u90a3\u4e48\u60a8\u5e94\u8be5\u4f1a\u7406\u89e3 <a href=\"https:\/\/kotlin.github.io\/dataframe\/columnselectors.html\" target=\"_blank\" rel=\"noreferrer noopener\">select<\/a> \u64cd\u4f5c\uff0c\u867d\u7136\u5b83\u73b0\u5728\u51fa\u73b0\u5728\u8bed\u53e5\u672b\u5c3e\u3002 \u60a8\u53ef\u4ee5\u5c06 <a href=\"https:\/\/kotlin.github.io\/dataframe\/filter.html\" target=\"_blank\" rel=\"noreferrer noopener\">filter<\/a> \u64cd\u4f5c\u89c6\u4e3a\u76f8\u5f53\u4e8e WHERE \u5b50\u53e5\uff0c\u5c06 sortBy \u64cd\u4f5c\u89c6\u4e3a\u76f8\u5f53\u4e8e ORDER BY\u3002<\/p>\n<p>\u4ee5 PostgreSQL \u4e2d\u7684\u6570\u636e\u5e93\u8868\u4e3a\u4f8b\uff0c\u60a8\u53ef\u4ee5\u5728 <a href=\"https:\/\/www.jetbrains.com\/datagrip\/\" target=\"_blank\" rel=\"noreferrer noopener\">DataGrip<\/a> \u4e2d\u521b\u5efa\u5e76\u8fd0\u884c\u4ee5\u4e0b\u67e5\u8be2\uff1a<\/p>\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" loading=\"lazy\" class=\"wp-image-468589\" src=\"https:\/\/blog.jetbrains.com\/wp-content\/uploads\/2024\/04\/No6-FirstSQL.png\" alt=\"\u5728 DataGrip \u4e2d\u521b\u5efa\u5e76\u8fd0\u884c\u67e5\u8be2\" width=\"1592\" height=\"1050\" \/><\/figure>\n<p>\u8bf7\u6ce8\u610f\uff0cAPI \u5305\u542b\u7528\u4e8e\u6267\u884c\u8f6c\u6362\u7684 select \u548c map \u8fd0\u7b97\u7b26\u3002<\/p>\n<h3 class=\"wp-block-heading\">distinct<\/h3>\n<p>\u67e5\u770b\u6570\u636e\uff0c\u60a8\u53ef\u4ee5\u53d1\u73b0\u8d21\u732e\u8005\u56de\u7b54\u7684\u95ee\u9898\u6570\u91cf\u5e76\u4e0d\u552f\u4e00\u3002 \u4f8b\u5982\uff0c\u4e0d\u6b62\u4e00\u4f4d\u8d21\u732e\u8005\u56de\u7b54\u4e86 15 \u4e2a\u95ee\u9898\u3002 \u60a8\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u65b9\u5f0f\u627e\u51fa\u6709\u591a\u5c11\u91cd\u590d\u9879\uff1a<\/p>\n<pre class=\"EnlighterJSRAW\">topFolksClean\n\u00a0\u00a0\u00a0.distinctBy { Answers }\n\u00a0\u00a0\u00a0.count()<\/pre>\n<p>\u5bf9\u4e8e\u64b0\u5199\u672c\u6587\u65f6\u7684\u6570\u636e\uff0c\u7ed3\u679c\u4e3a 93\uff0c\u8fd9\u610f\u5473\u7740 500 \u4f4d\u8d21\u732e\u8005\u53ef\u4ee5\u6839\u636e\u5176\u56de\u7b54\u7684\u95ee\u9898\u6570\u91cf\u5206\u4e3a 93 \u4e2a\u7ec4\u3002 <a href=\"https:\/\/kotlin.github.io\/dataframe\/distinct.html#distinctby\" target=\"_blank\" rel=\"noreferrer noopener\">distinctBy<\/a> \u64cd\u4f5c\u4e0d\u6267\u884c\u6b64\u5206\u7ec4\uff0c\u53ea\u662f\u4ece\u6bcf\u4e2a\u7ec4\u4e2d\u9009\u62e9\u7b2c\u4e00\u884c\u3002<\/p>\n<p>\u5982\u679c\u8981\u6309\u5e73\u5747\u56de\u7b54\u5f97\u5206\u964d\u5e8f\u6392\u5217\u8d21\u732e\u8005\uff0c\u90a3\u4e48 distinctBy \u64cd\u4f5c\u5e94\u4ec5\u9009\u62e9\u6bcf\u4e2a\u7ec4\u4e2d\u5f97\u5206\u6700\u9ad8\u7684\u8d21\u732e\u8005\u3002 \u6211\u4eec\u4f7f\u7528\u5185\u7f6e\u64cd\u4f5c\u6765\u9a8c\u8bc1\u3002<\/p>\n<p>\u60a8\u53ef\u4ee5\u9996\u5148\u68c0\u67e5\u539f\u59cb CSV \u6587\u4ef6\uff0c\u7136\u540e\u4ece Answers \u5217\u9009\u62e9\u4e00\u4e2a\u51fa\u73b0\u591a\u6b21\u7684\u503c\u3002 \u5728\u6b64\u793a\u4f8b\u4e2d\uff0c\u91cd\u590d\u503c\u4e3a 15\uff1a<\/p>\n<pre class=\"EnlighterJSRAW\">topFolksClean\n\u00a0\u00a0\u00a0.filter { Answers == 15 }<\/pre>\n<p>\u8fd9\u662f\u5173\u8054\u7684\u8f93\u51fa\u3002 \u6709 22 \u884c\uff0cNotebook \u5c06\u4ee5 10 \u884c\u4e3a\u4e00\u7ec4\u663e\u793a\u3002<\/p>\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" loading=\"lazy\" class=\"wp-image-468567\" src=\"https:\/\/blog.jetbrains.com\/wp-content\/uploads\/2024\/04\/No7-UsersWith15Answers.png\" alt=\"\" width=\"1718\" height=\"690\" \/><\/figure>\n<p>\u5728\u6211\u4eec\u7684\u7ed3\u679c\u4e2d\uff0c\u6b64\u7ec4\u7684\u6700\u9ad8\u5206\u4e3a 909.07\uff0c\u6700\u4f4e\u5206\u4e3a 58.33\u3002 \u68c0\u67e5\u60a8\u81ea\u5df1\u7684\u7ed3\u679c\u65f6\uff0c\u8bb0\u5f97\u7ffb\u9605\u6574\u4e2a\u6570\u636e\u96c6\uff01\u00a0<\/p>\n<p>\u5982\u679c\u4ee5\u5347\u5e8f\u6392\u5217\u5e76\u4f7f\u7528 distinctBy\uff0c\u5c06\u6709\u4e00\u4e2a <em>Answers<\/em> \u503c\u4e3a 15 \u7684\u8d21\u732e\u8005\uff1a<\/p>\n<pre class=\"EnlighterJSRAW\">topFolksClean\n\u00a0\u00a0\u00a0.sortBy { AverageScore }\n\u00a0\u00a0\u00a0.distinctBy { Answers }\n\u00a0\u00a0\u00a0.sortBy { Answers }<\/pre>\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" loading=\"lazy\" class=\"wp-image-468578\" src=\"https:\/\/blog.jetbrains.com\/wp-content\/uploads\/2024\/04\/No8-LowestUserWith15Answers.png\" alt=\"\" width=\"1718\" height=\"690\" \/><\/figure>\n<p>\u7531\u4e8e\u662f\u5347\u5e8f\u6392\u5217\uff0c\u5355\u4e2a\u8d21\u732e\u8005\u7684\u5f97\u5206\u5c06\u4e3a 58.33\u3002 \u5982\u9ad8\u4eae\u663e\u793a\u7684\u884c\u6240\u793a\u3002<\/p>\n<p>\u5982\u679c\u4ee5\u964d\u5e8f\u6392\u5217\uff0c\u5219\u7ed3\u679c\u4e2d\u663e\u793a\u7684\u8d21\u732e\u8005\u7684\u5206\u6570\u5e94\u4e3a 909.07\u3002 \u6211\u4eec\u6765\u786e\u8ba4\u4e00\u4e0b\uff1a<\/p>\n<pre class=\"EnlighterJSRAW\">topFolksClean\n\u00a0\u00a0\u00a0.sortByDesc { AverageScore }\n\u00a0\u00a0\u00a0.distinctBy { Answers }\n\u00a0\u00a0\u00a0.sortBy { Answers }<\/pre>\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" loading=\"lazy\" class=\"wp-image-468600\" src=\"https:\/\/blog.jetbrains.com\/wp-content\/uploads\/2024\/04\/No9-HighestUserWith15Answers.png\" alt=\"\" width=\"1718\" height=\"690\" \/><\/figure>\n<p>\u518d\u6b21\u83b7\u5f97\u9884\u671f\u5206\u6570\u3002\u00a0<\/p>\n<h3 class=\"wp-block-heading\">\u7ec4<\/h3>\n<p><em><br \/><\/em>\u60a8\u5bf9\u6570\u636e\u5df2\u7ecf\u6709\u4e86\u66f4\u597d\u7684\u7406\u89e3\uff0c\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u4f7f\u7528 <a href=\"https:\/\/kotlin.github.io\/dataframe\/groupby.html\" target=\"_blank\" rel=\"noreferrer noopener\">groupBy<\/a> \u6267\u884c\u5206\u7ec4\u3002 \u4e3a\u7b80\u5355\u8d77\u89c1\uff0c\u4ec5\u5bf9\u524d 10 \u4e2a\u7ed3\u679c\u5206\u7ec4\uff1a<\/p>\n<pre class=\"EnlighterJSRAW\">topFolksClean\n\u00a0\u00a0\u00a0.sortBy { AverageScore }\n\u00a0\u00a0\u00a0.tail(10)\n\u00a0\u00a0\u00a0.groupBy { Answers }<\/pre>\n<p>\u6b64\u7ed3\u679c\u8fd4\u56de\u7684\u6570\u636e\u7a0d\u5fae\u590d\u6742\u4e00\u4e9b\u3002 \u60a8\u5e94\u8be5\u770b\u5230\u4e00\u5217\u5305\u542b\u7ec4\u7684\u952e\uff0c\u5728\u672c\u4f8b\u4e2d\u4e3a\u56de\u7b54\u7684\u6570\u91cf\u3002 \u7136\u540e\uff0c\u662f\u4e00\u4e2a\u5305\u542b\u6570\u636e\u672c\u8eab\u7684\u5217\uff0c\u4f5c\u4e3a\u5d4c\u5957 DataFrame\u3002<\/p>\n<p>\u4e0b\u9762\u662f\u7ed3\u679c\u5728 Notebook \u4e2d\u7684\u8868\u793a\u65b9\u5f0f\u3002 \u8bf7\u6ce8\u610f\uff0c\u60a8\u53ef\u4ee5\u70b9\u51fb\u7ec4\u6765\u663e\u793a\u5176\u5185\u5bb9\uff1a<\/p>\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" loading=\"lazy\" class=\"wp-image-468611\" src=\"https:\/\/blog.jetbrains.com\/wp-content\/uploads\/2024\/04\/No10-GroupedData.png\" alt=\"\" width=\"1718\" height=\"788\" \/><\/figure>\n<p>\u5982\u679c\u60a8\u5728 SQL SELECT \u8bed\u53e5\u4e2d\u4f7f\u7528\u8fc7 GROUP BY \u5b50\u53e5\uff0c\u5e94\u8be5\u4f1a\u719f\u6089\u6b64\u64cd\u4f5c\u3002 \u8fd9\u662f PostgreSQL \u548c <a href=\"https:\/\/www.jetbrains.com\/datagrip\/\" target=\"_blank\" rel=\"noreferrer noopener\">DataGrip<\/a> \u7684\u53e6\u4e00\u4e2a\u793a\u4f8b\uff1a<\/p>\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" loading=\"lazy\" class=\"wp-image-468622\" src=\"https:\/\/blog.jetbrains.com\/wp-content\/uploads\/2024\/04\/No11-SecondSQL.png\" alt=\"\" width=\"1598\" height=\"1560\" \/><\/figure>\n<p>\u60a8\u53ef\u4ee5\u4ece\u67e5\u770b\u952e\u5f00\u59cb\u9010\u6e10\u63a2\u7d22\u5206\u7ec4\u6570\u636e\uff1a<\/p>\n<pre class=\"EnlighterJSRAW\">val groupedData = topFolksClean\n\u00a0\u00a0\u00a0.sortBy { AverageScore }\n\u00a0\u00a0\u00a0.tail(10)\n\u00a0\u00a0\u00a0.groupBy { Answers }\n\ngroupedData.keys<\/pre>\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" loading=\"lazy\" class=\"wp-image-468633\" src=\"https:\/\/blog.jetbrains.com\/wp-content\/uploads\/2024\/04\/No12-GroupedDataKeysOnly.png\" alt=\"\" width=\"1714\" height=\"784\" \/><\/figure>\n<p>\u7136\u540e\uff0c\u6253\u5370\u7ec4\uff1a<\/p>\n<pre class=\"EnlighterJSRAW\">groupedData.groups<\/pre>\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" loading=\"lazy\" class=\"wp-image-468644\" src=\"https:\/\/blog.jetbrains.com\/wp-content\/uploads\/2024\/04\/No13-GroupedDataGroupsOnly.png\" alt=\"\" width=\"1716\" height=\"784\" \/><\/figure>\n<p>\u5982\u679c\u5c55\u5f00\u6bcf\u4e2a\u7ec4\u67e5\u770b\u5176\u5185\u5bb9\uff0c\u60a8\u53ef\u4ee5\u770b\u5230\u5177\u6709 14 \u548c 15 \u4e2a\u56de\u7b54\u7684\u7ec4\u6709\u4e24\u4f4d\u6210\u5458\uff0c\u5176\u4ed6\u7ec4\u90fd\u6709\u4e00\u4f4d\u6210\u5458\u3002 \u56e0\u6b64\uff0c\u5bf9\u4e8e\u524d 10 \u4e2a\u7ed3\u679c\uff0c\u603b\u5171\u6709 8 \u4e2a\u7ec4\u3002<\/p>\n<h3 class=\"wp-block-heading\">filter<\/h3>\n<p>\u6765\u770b\u4e00\u770b\u662f\u5426\u53ef\u4ee5\u4f7f\u7528\u6838\u5fc3\u64cd\u4f5c\u67e5\u627e\u5e76\u663e\u793a\u5177\u6709\u591a\u4e2a\u7ed3\u679c\u7684\u7ec4\uff1a<\/p>\n<pre class=\"EnlighterJSRAW\">groupedData\n\u00a0\u00a0\u00a0.groups\n\u00a0\u00a0\u00a0.filter { df -&gt;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0df.rowsCount() &gt; 1\n\u00a0\u00a0\u00a0}.forEach { df -&gt;\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0println(df.first().Answers)\n\u00a0\u00a0\u00a0}<\/pre>\n<p>\u8fd9\u6bb5\u4ee3\u7801\u5c06\u7b5b\u9009\u5e76\u67e5\u627e\u5177\u6709\u591a\u884c\u7684\u7ec4\u3002 \u7136\u540e\uff0c\u5b83\u4f1a\u904d\u5386\u6bcf\u4e2a\u7ec4\uff0c\u6253\u5370\u56de\u7b54\u7684\u6570\u91cf\u3002 \u7ec4\u4e2d\u7684\u6bcf\u4e00\u884c\u90fd\u6709\u76f8\u540c\u6570\u91cf\u7684\u56de\u7b54\uff0c\u56e0\u6b64\u60a8\u53ef\u4ee5\u9009\u62e9\u60a8\u559c\u6b22\u7684\u4efb\u610f\u884c\u3002 \u5728\u672c\u4f8b\u4e2d\uff0c\u6211\u4eec\u9009\u62e9\u7b2c\u4e00\u4e2a\u3002<\/p>\n<p>\u7b5b\u9009\u5668\u8fd4\u56de\u4e24\u4e2a\u6570\u5b57\uff1a<\/p>\n<p>14<\/p>\n<p>15<\/p>\n<p>\u7531\u4e8e groups \u8fd4\u56de\u4e00\u5217 DataFrame\uff0c\u7b5b\u9009\u5668\u548c forEach \u65b9\u6cd5\u7684\u7b7e\u540d\u7565\u6709\u4e0d\u540c\u3002 \u6bcf\u6b21\u8c03\u7528 lambda \u65f6\uff0c\u90fd\u4f1a\u6709\u4e00\u4e2a\u503c\u4e3a\u5f53\u524d DataFrame \u7684\u5f62\u53c2\u3002<\/p>\n<h2 class=\"wp-block-heading\">\u66f4\u6539 DataFrame \u67b6\u6784<\/h2>\n<p>\u4f7f\u7528 DataFrame \u65f6\uff0c\u60a8\u4e0d\u4f1a\u53d7\u9650\u4e8e\u521b\u5efa DataFrame \u65f6\u63a8\u65ad\u7684\u67b6\u6784\u3002 \u60a8\u53ef\u4ee5\u6dfb\u52a0\u5217\u3001\u79fb\u9664\u5217\uff0c\u751a\u81f3\u66f4\u6539\u73b0\u6709\u5217\u7684\u6570\u636e\u7c7b\u578b\u3002 \u8003\u8651\u4ee5\u4e0b\u793a\u4f8b\uff1a<\/p>\n<pre class=\"EnlighterJSRAW\">val ratedFolks = topFolksClean\n\u00a0\u00a0\u00a0.sortBy { AverageScore }\n\u00a0\u00a0\u00a0.remove(\"Answers\")\n\u00a0\u00a0\u00a0.add(\"Rating\") {\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0when (AverageScore) {\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0in 0.0 .. \"Low\"\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0in 100.0 .. \"Medium\"\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0else -&gt; \"High\"\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\n\u00a0\u00a0\u00a0}<\/pre>\n<p>\u5728\u8fd9\u91cc\u83b7\u53d6\u6392\u5e8f\u540e\u7684\u6570\u636e\uff0c\u79fb\u9664 Answers \u5217\uff0c\u6dfb\u52a0\u4e00\u4e2a\u65b0\u7684 Rating \u5217\uff08\u6d3e\u751f\u81ea AverageScore\uff09\u3002 \u8fd9\u4f1a\u751f\u6210\u4e00\u4e2a\u65b0\u7684 DataFrame\uff0c\u79f0\u4e3a ratedFolks\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u60a8\u53ef\u4ee5\u5728\u5c06\u524d\u4e09\u884c\u548c\u6700\u540e\u4e09\u884c\u4e32\u8054\u5230\u4e00\u4e2a\u65b0\u7684 DataFrame \u4e2d\u540e\u67e5\u770b\uff1a<\/p>\n<pre class=\"EnlighterJSRAW\">val topAndBottom = listOf(ratedFolks.head(3), ratedFolks.tail(3)).concat()\n\ntopAndBottom<\/pre>\n<p>\u7ed3\u679c\u5e94\u8be5\u663e\u793a\u4e3a\uff1a<\/p>\n<figure class=\"wp-block-image\"><img decoding=\"async\" loading=\"lazy\" class=\"wp-image-468733\" src=\"https:\/\/blog.jetbrains.com\/wp-content\/uploads\/2024\/04\/image-53.png\" alt=\"\" width=\"1004\" height=\"922\" \/><\/figure>\n<p>\u8bf7\u6ce8\u610f\uff0c\u8fd9\u901a\u8fc7\u6dfb\u52a0\u5230\u6807\u51c6 <a href=\"https:\/\/kotlinlang.org\/api\/latest\/jvm\/stdlib\/kotlin.collections\/-iterable\/\" target=\"_blank\" rel=\"noreferrer noopener\">Iterable<\/a> \u7c7b\u578b\u7684<a href=\"https:\/\/kotlinlang.org\/docs\/extensions.html\" target=\"_blank\" rel=\"noreferrer noopener\">\u6269\u5c55\u51fd\u6570<\/a>\u5b9e\u73b0\u3002 \u6269\u5c55\u662f Kotlin \u4e2d\u7684\u4e00\u9879\u5173\u952e\u529f\u80fd\uff0c\u5b83\u4f7f\u5e93\u7b80\u5355\u6613\u7528\u3002<\/p>\n<h2 class=\"wp-block-heading\">\u76f4\u89c2\u5448\u73b0\u6570\u636e\u00a0<\/h2>\n<p>\u6b63\u5982\u60a8\u5df2\u7ecf\u770b\u5230\u7684\uff0c\u60a8\u53ef\u4ee5\u5229\u7528 <a href=\"https:\/\/github.com\/Kotlin\/kandy\" target=\"_blank\" rel=\"noreferrer noopener\">Kandy \u5e93<\/a>\u7ed8\u5236\u6570\u636e\u3002 \u6211\u4eec\u6765\u5c1d\u8bd5\u76f4\u89c2\u5448\u73b0\u6570\u636e\u4e2d\u51fa\u73b0\u9891\u7387\u6700\u9ad8\u7684 Answers \u503c\u3002\u00a0<\/p>\n<p>\u8f93\u5165\u5e76\u8fd0\u884c\uff1a<\/p>\n<pre class=\"EnlighterJSRAW\">val answersPairedWithCounts = topFolksClean\n\u00a0\u00a0\u00a0.groupBy { Answers }\n\u00a0\u00a0\u00a0.count()\n\u00a0\u00a0\u00a0.filter { column(\"count\") &gt;= 20 }<\/pre>\n<p>\u8fd9\u6bb5\u4ee3\u7801\u5c06\u6839\u636e\u56de\u7b54\u7684\u6570\u91cf\u5bf9\u8bb0\u5f55\u5206\u7ec4\uff0c\u7136\u540e\u7528\u5176\u5927\u5c0f\u66ff\u6362\u6bcf\u4e2a\u7ec4\u3002 \u4e3a\u7b80\u5355\u8d77\u89c1\uff0c\u6211\u4eec\u4ec5\u67e5\u770b\u5177\u6709 20 \u4f4d\u6216\u66f4\u591a\u6210\u5458\u7684\u7ec4\uff1a<\/p>\n<pre class=\"EnlighterJSRAW\">answersPairedWithCounts<\/pre>\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" loading=\"lazy\" class=\"wp-image-468666\" src=\"https:\/\/blog.jetbrains.com\/wp-content\/uploads\/2024\/04\/No15-AnswersPairedWithCounts.png\" alt=\"\" width=\"1712\" height=\"628\" \/><\/figure>\n<p>\u73b0\u5728\uff0c\u8ba9 Kandy \u5c06\u6b64 DataFrame \u7ed8\u5236\u4e3a\u6761\u5f62\u56fe\uff1a<\/p>\n<pre class=\"EnlighterJSRAW\">answersPairedWithCounts.plot {\n\u00a0\u00a0\u00a0bars {\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0x(Answers)\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0y(count)\n\u00a0\u00a0\u00a0}\n}<\/pre>\n<p>\u8fd9\u662f\u5f97\u5230\u7684\u56fe\u8868\uff1a<\/p>\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" loading=\"lazy\" class=\"wp-image-468677\" src=\"https:\/\/blog.jetbrains.com\/wp-content\/uploads\/2024\/04\/No16-SecondKandyChart.png\" alt=\"\" width=\"1234\" height=\"832\" \/><\/figure>\n<p>\u60a8\u53ef\u4ee5\u770b\u5230\uff0c\u6700\u5e38\u89c1\u7684\u56de\u7b54\u95ee\u9898\u6570\u4e3a 11\uff0c\u5728\u6570\u636e\u4e2d\u51fa\u73b0\u4e86 63 \u6b21\u3002<\/p>\n<p>\u8bf7\u6ce8\u610f\uff0c\u60a8\u5df2\u7ecf\u5728\u524d\u9762\u7684\u793a\u4f8b\u4e2d\u52a0\u8f7d\u4e86 Kandy \u5e93\uff1a<\/p>\n<pre class=\"EnlighterJSRAW\">%use kandy<\/pre>\n<p>\u5982\u679c\u60a8\u8df3\u8fc7\u4e86\u524d\u9762\u7684\u793a\u4f8b\uff0c\u90a3\u4e48\u60a8\u73b0\u5728\u9700\u8981\u52a0\u8f7d\u5e93\u3002 \u5982\u524d\u6240\u8ff0\uff0c\u6700\u597d\u5728\u5355\u72ec\u7684\u5355\u5143\u4e2d\u6267\u884c\u6b64\u64cd\u4f5c\u3002<\/p>\n<h2 class=\"wp-block-heading\">\u5bfc\u51fa\u60a8\u7684\u7ed3\u679c<\/h2>\n<p>\u5230\u76ee\u524d\u4e3a\u6b62\uff0c\u60a8\u53ea\u662f\u67e5\u770b\u4e86\u7ed3\u679c\uff0c\u8fd8\u6ca1\u6709\u4fdd\u5b58\u3002 \u6211\u4eec\u6765\u770b\u770b\u5982\u4f55\u4ece Kotlin Notebook \u5bfc\u51fa\u6570\u636e\u3002 \u5728\u4e0b\u9762\u7684\u4e24\u4e2a\u8868\u8fbe\u5f0f\u4e2d\uff0c\u521b\u5efa\u4e00\u4e2a\u65b0\u7684 DataFrame\uff0c\u7136\u540e\u5c06\u5176\u5bfc\u51fa\u4e3a CSV \u6587\u4ef6\u548c JSON \u6587\u6863\uff1a<\/p>\n<pre class=\"EnlighterJSRAW\">topFolksClean\n\u00a0\u00a0\u00a0.sortBy { AverageScore }\n\u00a0\u00a0\u00a0.tail(10)\n\u00a0\u00a0\u00a0.toCsv()\n\ntopFolksClean\n\u00a0\u00a0\u00a0.sortBy { AverageScore }\n\u00a0\u00a0\u00a0.tail(10)\n\u00a0\u00a0\u00a0.toJson()<\/pre>\n<p>\u5c06 DataFrame \u5bfc\u51fa\u5230 HTML \u7684\u8fd0\u4f5c\u65b9\u5f0f\u76f8\u540c\u3002 toStandaloneHTML \u65b9\u6cd5\u53ef\u4ee5\u751f\u6210\u5305\u542b\u8868\u7684 HTML \u6587\u6863\uff0c\u4ee5\u53ca\u5173\u8054\u7684 CSS \u6837\u5f0f\u548c JavaScript \u4e8b\u4ef6\u5904\u7406\u7a0b\u5e8f\u3002 \u6b64\u6587\u6863\u53ef\u4ee5\u76f4\u63a5\u5728\u9ed8\u8ba4\u6d4f\u89c8\u5668\u4e2d\u6253\u5f00\uff1a<\/p>\n<pre class=\"EnlighterJSRAW\">topFolksClean\n\u00a0\u00a0\u00a0.sortBy { AverageScore }\n\u00a0\u00a0\u00a0.tail(10)\n\u00a0\u00a0\u00a0.toStandaloneHTML()\n\u00a0\u00a0\u00a0.openInBrowser()<\/pre>\n<figure class=\"wp-block-image\"><img decoding=\"async\" loading=\"lazy\" class=\"wp-image-468743\" src=\"https:\/\/blog.jetbrains.com\/wp-content\/uploads\/2024\/04\/image-53.png\" alt=\"\" width=\"1004\" height=\"922\" \/><\/figure>\n<h2 class=\"wp-block-heading\">\u7ed3\u8bba<\/h2>\n<p>\u5e0c\u671b\u672c\u6559\u7a0b\u80fd\u591f\u5c55\u793a Kotlin DataFrame \u5e93\u7684\u5f3a\u5927\u529f\u80fd\u548c\u5b9e\u7528\u6027\u3002 \u8bf7\u8bb0\u4f4f\uff0c<a href=\"https:\/\/github.com\/garthgilmourni\/dataframe-blogs\" target=\"_blank\" rel=\"noreferrer noopener\">\u793a\u4f8b\u9879\u76ee<\/a>\u5305\u542b\u672c\u7cfb\u5217\u6240\u6709\u6559\u7a0b\u7684\u6570\u636e\u6587\u4ef6\u548c Notebook\u3002 \u60a8\u53ef\u4ee5\u514b\u9686\u6b64\u9879\u76ee\u5e76\u8f7b\u677e\u4fee\u6539\u793a\u4f8b\uff0c\u4e5f\u53ef\u4ee5\u7528\u60a8\u81ea\u5df1\u7684\u6570\u636e\u6587\u4ef6\u66ff\u6362\u793a\u4f8b\u6570\u636e\u6587\u4ef6\u3002<\/p>\n<p>\u5728\u4e0b\u4e00\u4e2a\u6559\u7a0b\u4e2d\uff0c\u6211\u4eec\u5c06\u5c55\u793a\u5982\u4f55\u4f7f\u7528 Stack Exchange REST API \u83b7\u53d6 JSON \u6570\u636e\u3002 \u4e0b\u4e00\u7bc7\u6587\u7ae0\u4e2d\u7684\u4fe1\u606f\u5c06\u66f4\u52a0\u590d\u6742\u548c\u5c42\u6b21\u5316\uff0c\u8ba9\u60a8\u80fd\u591f\u6df1\u5165\u4e86\u89e3 DataFrame API \u7684\u5f3a\u5927\u529f\u80fd\u3002<\/p>\n<p>\u672c\u535a\u6587\u82f1\u6587\u539f\u4f5c\u8005\uff1a<\/p>\n\n    <div class=\"about-author \">\n        <div class=\"about-author__box\">\n            <div class=\"row\">\n                <div class=\"about-author__box-img\">\n                    <img decoding=\"async\" src=\"https:\/\/secure.gravatar.com\/avatar\/?s=200&#038;r=g\" width=\"200\" height=\"200\" alt=\"\" loading=\"lazy\"  class=\"avatar avatar-200 wp-user-avatar wp-user-avatar-200 photo avatar-default\">\n                <\/div>\n                <div class=\"about-author__box-text\">\n                                                        <\/div>\n            <\/div>\n        <\/div>\n    <\/div>\n","protected":false},"author":1297,"featured_media":468707,"comment_status":"closed","ping_status":"closed","template":"","categories":[909],"tags":[7144,8477,8457],"cross-post-tag":[],"acf":[],"_links":{"self":[{"href":"https:\/\/blog.jetbrains.com\/zh-hans\/wp-json\/wp\/v2\/kotlin\/473167"}],"collection":[{"href":"https:\/\/blog.jetbrains.com\/zh-hans\/wp-json\/wp\/v2\/kotlin"}],"about":[{"href":"https:\/\/blog.jetbrains.com\/zh-hans\/wp-json\/wp\/v2\/types\/kotlin"}],"author":[{"embeddable":true,"href":"https:\/\/blog.jetbrains.com\/zh-hans\/wp-json\/wp\/v2\/users\/1297"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.jetbrains.com\/zh-hans\/wp-json\/wp\/v2\/comments?post=473167"}],"version-history":[{"count":10,"href":"https:\/\/blog.jetbrains.com\/zh-hans\/wp-json\/wp\/v2\/kotlin\/473167\/revisions"}],"predecessor-version":[{"id":473178,"href":"https:\/\/blog.jetbrains.com\/zh-hans\/wp-json\/wp\/v2\/kotlin\/473167\/revisions\/473178"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blog.jetbrains.com\/zh-hans\/wp-json\/wp\/v2\/media\/468707"}],"wp:attachment":[{"href":"https:\/\/blog.jetbrains.com\/zh-hans\/wp-json\/wp\/v2\/media?parent=473167"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.jetbrains.com\/zh-hans\/wp-json\/wp\/v2\/categories?post=473167"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.jetbrains.com\/zh-hans\/wp-json\/wp\/v2\/tags?post=473167"},{"taxonomy":"cross-post-tag","embeddable":true,"href":"https:\/\/blog.jetbrains.com\/zh-hans\/wp-json\/wp\/v2\/cross-post-tag?post=473167"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}