{"id":75505,"date":"2018-10-09T20:50:35","date_gmt":"2018-10-09T11:50:35","guid":{"rendered":"https:\/\/www.sejuku.net\/blog\/?p=75505"},"modified":"2024-05-06T11:52:43","modified_gmt":"2024-05-06T02:52:43","slug":"%e3%80%90pandas%e5%85%a5%e9%96%80%e3%80%91pandas%e3%81%aeindex%e3%81%ae%e6%89%b1%e3%81%84%e3%81%a8%e8%a1%8c%e3%81%ab%e5%90%8d%e5%89%8d%e3%82%92%e4%bb%98%e3%81%91%e3%82%8bset_index%ef%bc%81","status":"publish","type":"post","link":"https:\/\/www.sejuku.net\/blog\/75505","title":{"rendered":"\u3010Pandas\u5165\u9580\u3011pandas\u306eindex\u306e\u6271\u3044\u3068\u884c\u306b\u540d\u524d\u3092\u4ed8\u3051\u308bset_index\uff01"},"content":{"rendered":"<p>\u3053\u3093\u306b\u3061\u306f\uff01\u30a4\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u30fc\u306e\u30d5\u30af\u30ed\u30a6\u3067\u3059\uff01<\/p>\n<p><span style=\"color: #008000;\"><strong>DataFrame<\/strong><\/span>\u306b\u306f\u884c\u3084\u5217\u306b\u540d\u524d\u3092\u4ed8\u3051\u3089\u308c\u308b\u3068\u3044\u3046\u7279\u5fb4\u304c\u3042\u308a\u307e\u3059\u306d\u3002<\/p>\n<p>\u3053\u308c\u3089\u304c\u3042\u308b\u3053\u3068\u3067\u30c7\u30fc\u30bf\u304c\u898b\u3084\u3059\u304f\u306a\u308a\u3001\u8907\u96d1\u306a\u64cd\u4f5c\u3067\u3082\u30ca\u30f3\u30d0\u30ea\u30f3\u30b0\u3092\u53d6\u308a\u9055\u3048\u305f\u308a\u305b\u305a\u4fbf\u5229\u3067\u3059\u3002<\/p>\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001\u305d\u3093\u306aDataFrame\u306e\u4f5c\u6210\u306b\u306f\u6b20\u304b\u305b\u306a\u3044<span style=\"color: #0000ff;\"><strong>\u884c\u306e\u540d\u524d\/index\u306b\u3064\u3044\u3066<\/strong><\/span>\u304a\u8a71\u3057\u307e\u3059\u3002<\/p>\n<ul>\n<li><span style=\"color: #0000ff;\"><strong>index\u5f15\u6570\u3067\u884c\u306b\u540d\u524d\u3092\u4ed8\u3051\u308b<\/strong><\/span><\/li>\n<li><span style=\"color: #0000ff;\"><strong>set_index\u30e1\u30bd\u30c3\u30c9\u3067\u5217\u3092\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3068\u3057\u3066\u4f7f\u3046<\/strong><\/span><\/li>\n<\/ul>\n<p>\u3053\u306e\u4e8c\u3064\u304c\u30e1\u30a4\u30f3\u306e\u8a18\u4e8b\u3067\u3059\u306e\u3067\u3001DataFrame\u306e\u52c9\u5f37\u3092\u3057\u3066\u3044\u308b\u65b9\u306f\u662f\u975e\u8aad\u3093\u3067\u307f\u3066\u304f\u3060\u3055\u3044\uff01<\/p>\n<h2>\u30c7\u30fc\u30bf\u30d5\u30ec\u30fc\u30e0\u3068\u884c\u306e\u540d\u524d<\/h2>\n<p>DataFrame\u3092\u4f5c\u308b\u969b\u306b\u306f\u69d8\u3005\u306a\u30d1\u30e9\u30e1\u30fc\u30bf\u304c\u4f7f\u3048\u307e\u3059\u3002<\/p>\n<p>\u4f8b\u3048\u3070\u30c7\u30fc\u30bf\u30d5\u30ec\u30fc\u30e0\u306e<span style=\"color: #0000ff;\"><strong>\u8981\u7d20\u3092\u4ee3\u5165\u3059\u308b\u30d1\u30e9\u30e1\u30fc\u30bf<\/strong><\/span>\u3060\u3063\u305f\u308a\u3001<strong><span style=\"color: #0000ff;\">\u5217\u306e\u540d\u524d\u3092\u8a2d\u5b9a\u3059\u308bcolumns<\/span><\/strong>\u3060\u3063\u305f\u308a\u3067\u3059\u3002<\/p>\n<p>\u3053\u3053\u3067\u306f\u3001<\/p>\n<ul>\n<li>\u5217\u306e\u540d\u524d\u306bfeature\u5909\u6570<\/li>\n<li>\u884c\u306e\u540d\u524d\u306bname\u5909\u6570<\/li>\n<li>DataFrame\u306e\u8981\u7d20\u306bdata\u5909\u6570<\/li>\n<\/ul>\n<p>\u3092\u4e0e\u3048\u308b\u5834\u5408\u3092\u8003\u3048\u307e\u3059\u3002<\/p>\n<p>In [1]:<\/p>\n<div class=\"cell border-box-sizing code_cell rendered\">\n<div class=\"input\">\n<div class=\"inner_cell\">\n<div class=\"input_area\">\n<div class=\" highlight hl-ipython3\">\n<pre class=\"lang:default decode:true\">import pandas as pd \r\nimport numpy as np<\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"cell border-box-sizing code_cell rendered\">\n<div class=\"input\">\n<div class=\"prompt input_prompt\">In\u00a0[2]:<\/div>\n<div class=\"inner_cell\">\n<div class=\"input_area\">\n<div class=\" highlight hl-ipython3\">\n<pre class=\"lang:default decode:true\">name = [\"taro\",\"jiro\",\"saburo\",\"shiro\"]\r\n\r\nfeature = [\"height\",\"weight\",\"blood type\",\"age\"]\r\n\r\ndata = np.array([\r\n    [190,180,170,160],\r\n    [100,90,80,70],\r\n    [\"A\",\"B\",\"AB\",\"O\"],\r\n    [30,28,26,24]\r\n]).T\r\n\r\ndf = pd.DataFrame(data, \r\n                  columns=feature)\r\ndf<\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"output_wrapper\">\n<div class=\"output\">\n<div class=\"output_area\">\n<div class=\"prompt output_prompt\">Out[2]:<\/div>\n<div class=\"output_html rendered_html output_subarea output_execute_result\">\n<div>\n<table class=\"dataframe\" border=\"1\">\n<thead>\n<tr>\n<th><\/th>\n<th>height<\/th>\n<th>weight<\/th>\n<th>blood type<\/th>\n<th>age<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<th>0<\/th>\n<td>190<\/td>\n<td>100<\/td>\n<td>A<\/td>\n<td>30<\/td>\n<\/tr>\n<tr>\n<th>1<\/th>\n<td>180<\/td>\n<td>90<\/td>\n<td>B<\/td>\n<td>28<\/td>\n<\/tr>\n<tr>\n<th>2<\/th>\n<td>170<\/td>\n<td>80<\/td>\n<td>AB<\/td>\n<td>26<\/td>\n<\/tr>\n<tr>\n<th>3<\/th>\n<td>160<\/td>\n<td>70<\/td>\n<td>O<\/td>\n<td>24<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p>\u3053\u306e\u8868\u306b\u304a\u3044\u3066\u3001[0,1,2,3]\u3068\u66f8\u304b\u308c\u3066\u3044\u308b\u5217\u304c\u300c\u884c\u306e\u540d\u524d\u300d\u3084\u300cindex\u300d\u3068\u547c\u3093\u3067\u3044\u308b\u3082\u306e\u3067\u3059\u3002<\/p>\n<p>\u4f55\u3082\u8a2d\u5b9a\u3057\u306a\u3044\u5834\u5408\u306f\u3001<span style=\"color: #0000ff;\"><strong>\u4e0a\u304b\u3089\u30ca\u30f3\u30d0\u30ea\u30f3\u30b0<\/strong><\/span>\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u5024\u3092\u5909\u66f4\u3059\u308b\u65b9\u6cd5\u3092\u5b66\u3093\u3067\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<div class=\"cell border-box-sizing text_cell rendered\">\n<div class=\"inner_cell\">\n<div class=\"text_cell_render border-box-sizing rendered_html\">\n<h2 id=\"index\u30d1\u30e9\u30e1\u30fc\u30bf\">index\u30d1\u30e9\u30e1\u30fc\u30bf<\/h2>\n<h3>DataFrame\u306b\u5f8c\u304b\u3089index\u3092\u8a2d\u5b9a<\/h3>\n<p><span style=\"color: #008000;\"><strong>index\u30d1\u30e9\u30e1\u30fc\u30bf<\/strong><\/span>\u3092\u4f7f\u3046\u3068\u3001<span style=\"color: #0000ff;\"><strong>\u4f5c\u6210\u3057\u305fDataFrame\u306bindex\u306b\u5f53\u305f\u308b\u5024\u3092\u8ffd\u52a0\u3059\u308b<\/strong><\/span>\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u6642\u3001\u884c\u6570\u3068df.index\u306b\u4ee3\u5165\u3059\u308b\u30ea\u30b9\u30c8\u306e\u8981\u7d20\u6570\u304c\u540c\u3058\u6570\u306b\u306a\u3089\u306a\u3044\u3068\u3044\u3051\u306a\u3044\u3053\u3068\u306b\u6c17\u3092\u4ed8\u3051\u3066\u4e0b\u3055\u3044\u3002<\/p>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"cell border-box-sizing code_cell rendered\">\n<div class=\"input\">\n<div class=\"prompt input_prompt\">In\u00a0[3]:<\/div>\n<div class=\"inner_cell\">\n<div class=\"input_area\">\n<div class=\" highlight hl-ipython3\">\n<pre class=\"lang:default decode:true\">df2 = df.copy()\r\ndf2.index = name\r\n\r\ndf2<\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"output_wrapper\">\n<div class=\"output\">\n<div class=\"output_area\">\n<div class=\"prompt output_prompt\">Out[3]:<\/div>\n<div class=\"output_html rendered_html output_subarea output_execute_result\">\n<div>\n<table class=\"dataframe\" border=\"1\">\n<thead>\n<tr>\n<th><\/th>\n<th>height<\/th>\n<th>weight<\/th>\n<th>blood type<\/th>\n<th>age<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<th>taro<\/th>\n<td>190<\/td>\n<td>100<\/td>\n<td>A<\/td>\n<td>30<\/td>\n<\/tr>\n<tr>\n<th>jiro<\/th>\n<td>180<\/td>\n<td>90<\/td>\n<td>B<\/td>\n<td>28<\/td>\n<\/tr>\n<tr>\n<th>saburo<\/th>\n<td>170<\/td>\n<td>80<\/td>\n<td>AB<\/td>\n<td>26<\/td>\n<\/tr>\n<tr>\n<th>shiro<\/th>\n<td>160<\/td>\n<td>70<\/td>\n<td>O<\/td>\n<td>24<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"prompt input_prompt\"><\/div>\n<div class=\"cell border-box-sizing text_cell rendered\">\n<div class=\"inner_cell\">\n<div class=\"text_cell_render border-box-sizing rendered_html\">\n<h3>DataFrame\u3092\u4f5c\u308b\u969b\u306bindex\u3092\u8a2d\u5b9a<\/h3>\n<p>\u307e\u305f\u3001D<strong><span style=\"color: #0000ff;\">ataFrame\u3092\u4f5c\u308b\u6642\u70b9\u3067index\u3092\u6307\u5b9a\u3057\u3066\u4f5c\u308b\u3053\u3068\u3082\u53ef\u80fd<\/span><\/strong>\u3067\u3059\u3002<\/p>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"cell border-box-sizing code_cell rendered\">\n<div class=\"input\">\n<div class=\"prompt input_prompt\">In\u00a0[4]:<\/div>\n<div class=\"inner_cell\">\n<div class=\"input_area\">\n<div class=\" highlight hl-ipython3\">\n<pre class=\"lang:default decode:true\">df3 = pd.DataFrame(data, \r\n                   columns=feature, \r\n                   index=name)\r\ndf3<\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"output_wrapper\">\n<div class=\"output\">\n<div class=\"output_area\">\n<div class=\"prompt output_prompt\">Out[4]:<\/div>\n<div class=\"output_html rendered_html output_subarea output_execute_result\">\n<div>\n<table class=\"dataframe\" border=\"1\">\n<thead>\n<tr>\n<th><\/th>\n<th>height<\/th>\n<th>weight<\/th>\n<th>blood type<\/th>\n<th>age<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<th>taro<\/th>\n<td>190<\/td>\n<td>100<\/td>\n<td>A<\/td>\n<td>30<\/td>\n<\/tr>\n<tr>\n<th>jiro<\/th>\n<td>180<\/td>\n<td>90<\/td>\n<td>B<\/td>\n<td>28<\/td>\n<\/tr>\n<tr>\n<th>saburo<\/th>\n<td>170<\/td>\n<td>80<\/td>\n<td>AB<\/td>\n<td>26<\/td>\n<\/tr>\n<tr>\n<th>shiro<\/th>\n<td>160<\/td>\n<td>70<\/td>\n<td>O<\/td>\n<td>24<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"cell border-box-sizing text_cell rendered\">\n<div class=\"prompt input_prompt\"><\/div>\n<div class=\"inner_cell\">\n<div class=\"text_cell_render border-box-sizing rendered_html\">\n<h2 id=\"set_index\">set_index<\/h2>\n<p>DataFrame\u306e<span style=\"color: #0000ff;\"><strong>\u7279\u5b9a\u306e\u5217\u3092\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306b\u3059\u308b\u30e1\u30bd\u30c3\u30c9<\/strong><\/span>\u3068\u3057\u3066\u3001<strong><span style=\"color: #008000;\">df.set_index<\/span><\/strong>\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<p>\u4f8b\u3048\u3070age\u5217\u3092\u884c\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306b\u3057\u305f\u3044\u3068\u304d\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u5217\u306e\u540d\u524d\u3092\u6307\u5b9a\u3059\u308c\u3070OK\u3067\u3059\u3002<\/p>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"cell border-box-sizing code_cell rendered\">\n<div class=\"input\">\n<div class=\"prompt input_prompt\">In\u00a0[5]:<\/div>\n<div class=\"inner_cell\">\n<div class=\"input_area\">\n<div class=\" highlight hl-ipython3\">\n<pre class=\"lang:default decode:true\">df4 = df.copy()\r\ndf4.set_index(\"age\",        # \u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306b\u3057\u305f\u3044\u5217\u540d\r\n              inplace=True) # df4\u3092\u66f8\u304d\u63db\u3048\u308b\u306a\u3089True\r\n\r\ndf4<\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"output_wrapper\">\n<div class=\"output\">\n<div class=\"output_area\">\n<div class=\"prompt output_prompt\">Out[5]:<\/div>\n<div class=\"output_html rendered_html output_subarea output_execute_result\">\n<div>\n<table class=\"dataframe\" border=\"1\">\n<thead>\n<tr>\n<th><\/th>\n<th>height<\/th>\n<th>weight<\/th>\n<th>blood type<\/th>\n<\/tr>\n<tr>\n<th>age<\/th>\n<th><\/th>\n<th><\/th>\n<th><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<th>30<\/th>\n<td>190<\/td>\n<td>100<\/td>\n<td>A<\/td>\n<\/tr>\n<tr>\n<th>28<\/th>\n<td>180<\/td>\n<td>90<\/td>\n<td>B<\/td>\n<\/tr>\n<tr>\n<th>26<\/th>\n<td>170<\/td>\n<td>80<\/td>\n<td>AB<\/td>\n<\/tr>\n<tr>\n<th>24<\/th>\n<td>160<\/td>\n<td>70<\/td>\n<td>O<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"cell border-box-sizing text_cell rendered\">\n<div class=\"prompt input_prompt\"><\/div>\n<div class=\"inner_cell\">\n<div class=\"text_cell_render border-box-sizing rendered_html\">\n<p>\u307e\u305f\u3001\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306b\u306f<span style=\"color: #0000ff;\"><strong>\u8907\u6570\u306e\u5217<\/strong><\/span>\u3092\u4f7f\u3046\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u3053\u306e\u5834\u5408\u306f<span style=\"color: #0000ff;\"><strong>\u5217\u540d\u3092\u30ea\u30b9\u30c8\u306b\u3057\u3066<\/strong><\/span>\u95a2\u6570\u306b\u6e21\u3057\u307e\u3059\u3002<\/p>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"cell border-box-sizing code_cell rendered\">\n<div class=\"input\">\n<div class=\"prompt input_prompt\">In\u00a0[6]:<\/div>\n<div class=\"inner_cell\">\n<div class=\"input_area\">\n<div class=\" highlight hl-ipython3\">\n<pre class=\"lang:default decode:true\">df5 = df.copy()\r\ndf5.set_index([\"age\", \"blood type\"], # \u5217\u3092\u8907\u6570index\u306b\r\n              drop=False)            # index\u306b\u3057\u305f\u5217\u3082\u8981\u7d20\u3068\u3057\u3066\u4fdd\u6301\u3059\u308b\r\n<\/pre>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"output_wrapper\">\n<div class=\"output\">\n<div class=\"output_area\">\n<div class=\"prompt output_prompt\">Out[6]:<\/div>\n<div class=\"output_html rendered_html output_subarea output_execute_result\">\n<div>\n<table class=\"dataframe\" border=\"1\">\n<thead>\n<tr>\n<th><\/th>\n<th><\/th>\n<th>height<\/th>\n<th>weight<\/th>\n<th>blood type<\/th>\n<th>age<\/th>\n<\/tr>\n<tr>\n<th>age<\/th>\n<th>blood type<\/th>\n<th><\/th>\n<th><\/th>\n<th><\/th>\n<th><\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<th>30<\/th>\n<th>A<\/th>\n<td>190<\/td>\n<td>100<\/td>\n<td>A<\/td>\n<td>30<\/td>\n<\/tr>\n<tr>\n<th>28<\/th>\n<th>B<\/th>\n<td>180<\/td>\n<td>90<\/td>\n<td>B<\/td>\n<td>28<\/td>\n<\/tr>\n<tr>\n<th>26<\/th>\n<th>AB<\/th>\n<td>170<\/td>\n<td>80<\/td>\n<td>AB<\/td>\n<td>26<\/td>\n<\/tr>\n<tr>\n<th>24<\/th>\n<th>O<\/th>\n<td>160<\/td>\n<td>70<\/td>\n<td>O<\/td>\n<td>24<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div class=\"cell border-box-sizing text_cell rendered\">\n<div class=\"inner_cell\">\n<div class=\"text_cell_render border-box-sizing rendered_html\">\n<h2 id=\"\u307e\u3068\u3081\">\u307e\u3068\u3081<\/h2>\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001DataFrame\u306e\uff08\u884c\u306e\uff09index\u306b\u3064\u3044\u3066\u306e\u304a\u8a71\u3092\u307e\u3068\u3081\u307e\u3057\u305f\u3002<\/p>\n<ul>\n<li><span style=\"color: #0000ff;\"><strong>DataFrame\u306eindex\u30d1\u30e9\u30e1\u30fc\u30bf\u3067\u884c\u540d\u3092\u6307\u5b9a<\/strong><\/span><\/li>\n<li><span style=\"color: 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