{"id":3753,"date":"2021-12-18T23:14:27","date_gmt":"2021-12-18T14:14:27","guid":{"rendered":"https:\/\/obenkyolab.com\/?p=3753"},"modified":"2022-01-09T10:45:43","modified_gmt":"2022-01-09T01:45:43","slug":"%e3%80%90python%e3%80%91pandas%e3%81%aegroupby%e3%81%a7%e6%9c%80%e5%a4%a7%e3%82%84%e6%9c%80%e5%b0%8f%e3%81%ab%e8%a9%b2%e5%bd%93%e3%81%99%e3%82%8b%e3%81%bb%e3%81%8b%e3%81%ae%e5%88%97%e3%81%ae%e5%80%a4","status":"publish","type":"post","link":"https:\/\/obenkyolab.com\/?p=3753","title":{"rendered":"\u3010Python\u3011pandas\u306egroupby\u3067\u6700\u5927\u30fb\u6700\u5c0f\u3068\u306a\u308b\u5024\u306e\u4ed6\u306e\u5217\u306e\u5024\u3092\u62bd\u51fa\u3059\u308b\u65b9\u6cd5"},"content":{"rendered":"\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_80 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/obenkyolab.com\/?p=3753\/#%E6%A6%82%E8%A6%81\" >\u6982\u8981<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/obenkyolab.com\/?p=3753\/#%E7%B5%90%E6%9E%9C%E3%81%AE%E3%82%B3%E3%83%BC%E3%83%89\" >\u7d50\u679c\u306e\u30b3\u30fc\u30c9<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/obenkyolab.com\/?p=3753\/#20211224_%E8%BF%BD%E8%A8%98\" >2021\/12\/24 \u8ffd\u8a18<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/obenkyolab.com\/?p=3753\/#%E8%AA%AC%E6%98%8E\" >\u8aac\u660e<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/obenkyolab.com\/?p=3753\/#%E3%81%BE%E3%81%A8%E3%82%81\" >\u307e\u3068\u3081<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E6%A6%82%E8%A6%81\"><\/span>\u6982\u8981<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>python\u306epandas\u3067groupby\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u5217\u306e\u3042\u308b\u30b0\u30eb\u30fc\u30d7\u306b\u304a\u3051\u308b\u6700\u5927\u5024\u3084\u6700\u5c0f\u5024\u3092\u53d6\u5f97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4f8b\u3048\u3070\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30c7\u30fc\u30bf\u306e\u5834\u5408\u306e\u4f8b\u3067\u8003\u3048\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-python\" data-lang=\"Python\"><code>import pandas as pd\ndf = pd.DataFrame([[&#39;10:00:00&#39;,&#39;A&#39;,10],[&#39;10:00:01&#39;,&#39;A&#39;,11],[&#39;10:00:02&#39;,&#39;A&#39;,10],[&#39;10:00:03&#39;,&#39;B&#39;,5],[&#39;10:00:04&#39;,&#39;B&#39;,5],[&#39;10:00:05&#39;,&#39;B&#39;,4]])\ndf.columns = [&#39;time&#39;,&#39;category&#39;,&#39;value&#39;]<\/code><\/pre><\/div>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"192\" height=\"161\" src=\"https:\/\/obenkyolab.com\/wp-content\/uploads\/2021\/12\/image-19.png\" alt=\"\" class=\"wp-image-3756\"\/><\/figure>\n\n\n\n<p>\u4e0a\u8a18\u306e\u30c7\u30fc\u30bf\u306b\u304a\u3044\u3066A,B\u306b\u304a\u3051\u308b\u6700\u5927\u5024\u3092\u53d6\u308a\u51fa\u3057\u305f\u3044\u3068\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/obenkyolab.com\/wp-content\/uploads\/2021\/12\/image-21.png\" alt=\"\" class=\"wp-image-3759\" width=\"186\" height=\"177\"\/><\/figure>\n\n\n\n<p>\u305d\u306e\u5834\u5408\u3001\u30b3\u30fc\u30c9\u3067category\u304cA\u3001B\u306e\u305d\u308c\u305e\u308c\u306b\u304a\u3051\u308b\u6700\u5927\u5024\u3092\u7c21\u5358\u306b\u53d6\u5f97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-python\" data-lang=\"Python\"><code>df_value_max = df[[&#39;category&#39;,&#39;value&#39;]].groupby(&#39;category&#39;).max()<\/code><\/pre><\/div>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"130\" height=\"119\" src=\"https:\/\/obenkyolab.com\/wp-content\/uploads\/2021\/12\/image-20.png\" alt=\"\" class=\"wp-image-3757\"\/><\/figure>\n\n\n\n<p>\u305f\u3060\u3057\u3001\u6642\u306b\u306f\u3001\u30ab\u30c6\u30b4\u30eaA\u3001B\u306e\u5024\u3068\u4e00\u7dd2\u306b\u3001\u6700\u5927\u306b\u306a\u308b\u3068\u304d\u306e\u307b\u304b\u306e\u5217\u306e\u5024\u3082\u53d6\u5f97\u3057\u305f\u3044\u3053\u3068\u3082\u3042\u308b\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u4e0a\u8a18\u306e\u4f8b\u3060\u3068\u3001time \u5217\u306b\u304a\u3044\u3066\u305d\u308c\u305e\u308cA\u304c\u6700\u5927\u3068\u306a\u308b&#8221;10:00:01&#8243;\u3068B\u304c\u6700\u5927\u306b\u306a\u308b&#8221;10:00:03&#8243;\u3092\u53d6\u5f97\u3057\u305f\u3044\u3088\u3046\u306a\u5834\u5408\u3067\u3059\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/obenkyolab.com\/wp-content\/uploads\/2021\/12\/image-22.png\" alt=\"\" class=\"wp-image-3760\" width=\"200\" height=\"190\"\/><\/figure>\n\n\n\n<p>\u4eca\u56de\u306f\u3053\u308c\u3089\u3092\u53d6\u5f97\u3059\u308b\u65b9\u6cd5\u306b\u3064\u3044\u3066\u8003\u3048\u3066\u307f\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E7%B5%90%E6%9E%9C%E3%81%AE%E3%82%B3%E3%83%BC%E3%83%89\"><\/span>\u7d50\u679c\u306e\u30b3\u30fc\u30c9<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u7d50\u679c\u304b\u3089\u8a00\u3046\u3068\u3001\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u3067\u5b9f\u73fe\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3057\u305f\u3002\u30c7\u30fc\u30bf\u3092\u8aad\u307f\u8fbc\u3080\u3068\u3053\u308d\u304b\u3089\u306e\u5168\u4f53\u306e\u30b3\u30fc\u30c9\u3067\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-python\" data-file=\"idxmax_test.py\" data-lang=\"Python\"><code>#\u3053\u3053\u306f\u30c7\u30fc\u30bf\u306e\u8aad\u307f\u8fbc\u307f\u90e8\nimport pandas as pd\ndf = pd.DataFrame([[&#39;10:00:00&#39;,&#39;A&#39;,10],[&#39;10:00:01&#39;,&#39;A&#39;,11],[&#39;10:00:02&#39;,&#39;A&#39;,10],[&#39;10:00:03&#39;,&#39;B&#39;,5],[&#39;10:00:04&#39;,&#39;B&#39;,5],[&#39;10:00:05&#39;,&#39;B&#39;,4]])\ndf.columns = [&#39;time&#39;,&#39;category&#39;,&#39;value&#39;]\n\n#\u30c7\u30fc\u30bf\u62bd\u51fa\u306e\u90e8\u5206\ndf = df.reset_index()\ndf_idx_max = df[[&#39;category&#39;,&#39;value&#39;]].groupby(&#39;category&#39;).idxmax()\ndf_idx_max.columns = [&#39;max_idx&#39;]\ndf_mrg = pd.merge(df, df_idx_max, left_on=&#39;index&#39;, right_on=&#39;max_idx&#39;)\ndf_mrg.head()<\/code><\/pre><\/div>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/obenkyolab.com\/wp-content\/uploads\/2021\/12\/image-27.png\" alt=\"\" class=\"wp-image-3765\" width=\"317\" height=\"90\" srcset=\"https:\/\/obenkyolab.com\/wp-content\/uploads\/2021\/12\/image-27.png 451w, https:\/\/obenkyolab.com\/wp-content\/uploads\/2021\/12\/image-27-300x85.png 300w\" sizes=\"auto, (max-width: 317px) 100vw, 317px\" \/><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"20211224_%E8%BF%BD%E8%A8%98\"><\/span><strong>2021\/12\/24 \u8ffd\u8a18<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u30b3\u30e1\u30f3\u30c8\u3067\u6559\u3048\u3066\u3044\u305f\u3060\u3044\u305f\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u306e\u65b9\u304c\u65ad\u7136\u30b7\u30f3\u30d7\u30eb\u306b\u5b9f\u73fe\u3067\u304d\u307e\u3057\u305f\u306e\u3067\u8ffd\u8a18\u3055\u305b\u3066\u3044\u305f\u3060\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-python\" data-lang=\"Python\"><code>#\u30c7\u30fc\u30bf\u62bd\u51fa\u306e\u90e8\u5206\ndf = df.reset_index()\ndf.loc[df.groupby(&#39;category&#39;)[&#39;value&#39;].idxmax()]<\/code><\/pre><\/div>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"243\" height=\"88\" src=\"https:\/\/obenkyolab.com\/wp-content\/uploads\/2021\/12\/image-28.png\" alt=\"\" class=\"wp-image-3773\"\/><\/figure>\n\n\n\n<p>\u3000<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E8%AA%AC%E6%98%8E\"><\/span>\u8aac\u660e<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u9806\u756a\u306b\u30b3\u30fc\u30c9\u306e\u8aac\u660e\u3092\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u307e\u305a\u3001\u6700\u521d\u306b\u30c7\u30fc\u30bf\u3092\u8aad\u307f\u8fbc\u307f\u9069\u5f53\u306a\u30ab\u30e9\u30e0\u540d\u3092\u4ed8\u3051\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-python\" data-lang=\"Python\"><code>import pandas as pd\ndf = pd.DataFrame([[&#39;10:00:00&#39;,&#39;A&#39;,10],[&#39;10:00:01&#39;,&#39;A&#39;,11],[&#39;10:00:02&#39;,&#39;A&#39;,10],[&#39;10:00:03&#39;,&#39;B&#39;,5],[&#39;10:00:04&#39;,&#39;B&#39;,5],[&#39;10:00:05&#39;,&#39;B&#39;,4]])\ndf.columns = [&#39;time&#39;,&#39;category&#39;,&#39;value&#39;]<\/code><\/pre><\/div>\n\n\n\n<p>\u6b21\u306b\u3001reset_index()\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3066index\u3092\u5217\u5316\u3057\u3066\u304a\u304d\u307e\u3059\u3002\u3053\u308c\u306f\u6700\u5f8c\u306bmerge\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u3064\u3082\u308a\u306a\u306e\u3067\u3059\u304c\u3001\u305d\u306e\u969b\u306b\u7d50\u5408\u3059\u308b\u5217\u3092\u308f\u304b\u308a\u3084\u3059\u304f\u3059\u308b\u305f\u3081\u3067\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-python\" data-lang=\"Python\"><code>df = df.reset_index()<\/code><\/pre><\/div>\n\n\n\n<figure class=\"wp-block-image size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"228\" height=\"162\" src=\"https:\/\/obenkyolab.com\/wp-content\/uploads\/2021\/12\/image-23.png\" alt=\"\" class=\"wp-image-3761\"\/><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<p>\u3000<\/p>\n\n\n\n<p>\u6b21\u304c\u7d50\u69cb\u91cd\u8981\u306a\u90e8\u5206\u306b\u306a\u308a\u307e\u3059\u3002idxmax\u30e1\u30bd\u30c3\u30c9\u3068\u3044\u3046\u3082\u306e\u3092\u4f7f\u7528\u3057\u3001<strong>category\u306b\u304a\u3044\u3066\u3001value\u304c\u6700\u5927\u3068\u306a\u308b\u969b\u306e<span class=\"has-inline-color has-vivid-red-color\">index<\/span><\/strong>\u3092\u53d6\u5f97\u3057\u307e\u3059\u3002\u306a\u304a\u3001\u6700\u5927\u306e\u5024\u3068\u306a\u308b\u884c\u304c\u91cd\u8907\u3059\u308b\u5834\u5408\u306b\u306f\u6700\u521d\u306e\u884c\u756a\u53f7\u304c\u53d6\u308a\u51fa\u3055\u308c\u308b\u3088\u3046\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u307e\u305f\u3001\u7d50\u679c\u306e\u5217\u540d\u306b\u308f\u304b\u308a\u3084\u3059\u3044\u540d\u524d\u3092\u632f\u3063\u3066\u304a\u304d\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-python\" data-lang=\"Python\"><code>df_idx_max = df[[&#39;category&#39;,&#39;value&#39;]].groupby(&#39;category&#39;).idxmax()\ndf_idx_max.columns = [&#39;max_idx&#39;]<\/code><\/pre><\/div>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/obenkyolab.com\/wp-content\/uploads\/2021\/12\/image-24.png\" alt=\"\" class=\"wp-image-3762\" width=\"152\" height=\"124\"\/><\/figure>\n\n\n\n<p>\u3053\u306eidxmax\u30e1\u30bd\u30c3\u30c9\u306f\u975e\u5e38\u306b\u5f37\u529b\u3067\u3059\u3002\u3068\u3044\u3046\u306e\u3082\u3001idxmax\u3092\u4f7f\u7528\u3059\u308b\u3068\u308f\u3056\u308f\u3056max\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u5fc5\u8981\u304c\u306a\u304f\u306a\u308b\u305f\u3081\u3067\u3059\u3002<\/p>\n\n\n\n<p>\u306a\u305c\u306a\u3089\u3001df\u3092\u5de6\u5074\u3068\u3057\u3066index\u3068max_idx\u3092\u30ad\u30fc\u306b\u5185\u90e8\u7d50\u5408\u3059\u308b\u3053\u3068\u3067\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"hcb_wrap\"><pre class=\"prism line-numbers lang-python\" data-lang=\"Python\"><code>df_mrg = pd.merge(df, df_idx_max, left_on=&#39;index&#39;, right_on=&#39;max_idx&#39;)<\/code><\/pre><\/div>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/obenkyolab.com\/wp-content\/uploads\/2021\/12\/image-25.png\" alt=\"\" class=\"wp-image-3763\" width=\"419\" height=\"176\" srcset=\"https:\/\/obenkyolab.com\/wp-content\/uploads\/2021\/12\/image-25.png 641w, https:\/\/obenkyolab.com\/wp-content\/uploads\/2021\/12\/image-25-300x126.png 300w\" sizes=\"auto, (max-width: 419px) 100vw, 419px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/obenkyolab.com\/wp-content\/uploads\/2021\/12\/image-26.png\" alt=\"\" class=\"wp-image-3764\" width=\"431\" height=\"122\"\/><\/figure>\n\n\n\n<p>\u5185\u90e8\u7d50\u5408\u306b\u3088\u308a\u3001category\u5217\u306e\u5404\u5024\u306b\u304a\u3051\u308bvalue\u304c\u6700\u5927\u306b\u306a\u308b\u884c\u306e\u307f\u3092\u53d6\u308a\u51fa\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<p>\u3053\u308c\u306b\u3088\u308a\u3001\u5f53\u521d\u76ee\u7684\u3068\u3057\u3066\u3044\u305ftime\u306e\u5024\u3082\u62bd\u51fa\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3057\u305f\u3002<\/p>\n\n\n\n<p>\u306a\u304a\u3001idxmin\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u6700\u5c0f\u306e\u5834\u5408\u306e\u307b\u304b\u306e\u5217\u306e\u5024\u3082\u53d6\u5f97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E3%81%BE%E3%81%A8%E3%82%81\"><\/span>\u307e\u3068\u3081<span 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