{"id":636,"date":"2023-11-25T12:03:17","date_gmt":"2023-03-20T18:35:26","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/index.php\/2023\/11\/30\/%e3%83%91%e3%83%b3%e3%83%80%e3%81%ae%e3%83%89%e3%83%ad%e3%83%83%e3%83%97%e9%87%8d%e8%a4%87%e8%a1%8c-drop_duplicates-%e9%96%a2%e6%95%b0\/"},"modified":"2025-08-01T01:16:18","modified_gmt":"2025-07-31T16:16:18","slug":"%e3%83%91%e3%83%b3%e3%83%80%e3%81%ae%e3%83%89%e3%83%ad%e3%83%83%e3%83%97%e9%87%8d%e8%a4%87%e8%a1%8c-drop_duplicates-%e9%96%a2%e6%95%b0","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/%e3%83%91%e3%83%b3%e3%83%80%e3%81%ae%e3%83%89%e3%83%ad%e3%83%83%e3%83%97%e9%87%8d%e8%a4%87%e8%a1%8c-drop_duplicates-%e9%96%a2%e6%95%b0\/","title":{"rendered":"\u30d1\u30f3\u30c0\u306e\u30c9\u30ed\u30c3\u30d7\u91cd\u8907\u884c &#8211; drop_duplicates() \u95a2\u6570"},"content":{"rendered":"<h2>\u30d1\u30f3\u30c0\u306edrop_duplicates()\u95a2\u6570\u306e\u69cb\u6587<\/h2>\n<p>\u30d1\u30f3\u30c0\u306edrop_duplicates()\u95a2\u6570\u306f\u3001\u30c7\u30fc\u30bf\u30d5\u30ec\u30fc\u30e0\u304b\u3089\u91cd\u8907\u3059\u308b\u884c\u3092\u524a\u9664\u3057\u307e\u3059\u3002\u305d\u306e\u69cb\u6587\u306f\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>drop_duplicates(self, subset=None, keep=\"first\", inplace=False)\r\n<\/code><\/pre>\n<ul class=\"post-ul\">\n<li>subset: column label or sequence of labels to consider for identifying duplicate rows. By default, all the columns are used to find the duplicate rows.<\/li>\n<li>keep: allowed values are {\u2018first\u2019, \u2018last\u2019, False}, default \u2018first\u2019. If \u2018first\u2019, duplicate rows except the first one is deleted. If \u2018last\u2019, duplicate rows except the last one is deleted. If False, all the duplicate rows are deleted.<\/li>\n<li>inplace: if True, the source DataFrame is changed and None is returned. By default, source DataFrame remains unchanged and a new DataFrame instance is returned.<\/li>\n<\/ul>\n<h2>\u30d1\u30f3\u30c0\u306e\u91cd\u8907\u884c\u306e\u524a\u9664\u306e\u4f8b<\/h2>\n<p>\u30c7\u30fc\u30bf\u30d5\u30ec\u30fc\u30e0\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304b\u3089\u91cd\u8907\u3057\u305f\u884c\u3092\u524a\u9664\u3059\u308b\u3044\u304f\u3064\u304b\u306e\u4f8b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<h3>\u91cd\u8907\u884c\u3092\u524a\u9664\u3057\u3001\u6700\u521d\u306e\u884c\u3092\u6b8b\u3059\u3002<\/h3>\n<p>\u5f15\u6570\u304c\u6e21\u3055\u308c\u306a\u3044\u5834\u5408\u3001\u3053\u308c\u306f\u30c7\u30d5\u30a9\u30eb\u30c8\u306e\u52d5\u4f5c\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>import pandas as pd\r\n\r\nd1 = {'A': [1, 1, 1, 2], 'B': [2, 2, 2, 3], 'C': [3, 3, 4, 5]}\r\n\r\nsource_df = pd.DataFrame(d1)\r\nprint('Source DataFrame:\\n', source_df)\r\n\r\n# keep first duplicate row\r\nresult_df = source_df.drop_duplicates()\r\nprint('Result DataFrame:\\n', result_df)\r\n<\/code><\/pre>\n<p>\u7d50\u679c\u3092\u65e5\u672c\u8a9e\u3067\u81ea\u7136\u306b\u8a00\u3044\u63db\u3048\u3066\u304f\u3060\u3055\u3044\u3002\u30aa\u30d7\u30b7\u30e7\u30f3\u306f\u4e00\u3064\u3060\u3051\u5fc5\u8981\u3067\u3059\u3002<\/p>\n<p>\u51fa\u529b\uff1a<\/p>\n<pre class=\"post-pre\"><code>Source DataFrame:\r\n    A  B  C\r\n0  1  2  3\r\n1  1  2  3\r\n2  1  2  4\r\n3  2  3  5\r\nResult DataFrame:\r\n    A  B  C\r\n0  1  2  3\r\n2  1  2  4\r\n3  2  3  5\r\n<\/code><\/pre>\n<p>\u30bd\u30fc\u30b9\u306eDataFrame\u306e0\u884c\u76ee\u30681\u884c\u76ee\u306f\u91cd\u8907\u3057\u3066\u3044\u307e\u3059\u3002\u6700\u521d\u306e\u51fa\u73fe\u306f\u4fdd\u6301\u3055\u308c\u3001\u91cd\u8907\u3057\u305f\u305d\u306e\u4ed6\u306e\u884c\u306f\u524a\u9664\u3055\u308c\u307e\u3059\u3002<\/p>\n<h3>2. \u91cd\u8907\u3092\u524a\u9664\u3057\u3001\u6700\u5f8c\u306e\u884c\u3092\u6b8b\u3059\u3002<\/h3>\n<pre class=\"post-pre\"><code>result_df = source_df.drop_duplicates(keep='last')\r\nprint('Result DataFrame:\\n', result_df)\r\n<\/code><\/pre>\n<p>\u51fa\u529b:<\/p>\n<pre class=\"post-pre\"><code>Result DataFrame:\r\n    A  B  C\r\n1  1  2  3\r\n2  1  2  4\r\n3  2  3  5\r\n<\/code><\/pre>\n<p>\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u300c0\u300d\u304c\u524a\u9664\u3055\u308c\u3001\u51fa\u529b\u3067\u306f\u6700\u5f8c\u306e\u91cd\u8907\u884c\u300c1\u300d\u304c\u4fdd\u6301\u3055\u308c\u307e\u3059\u3002<\/p>\n<h3>3. \u30c7\u30fc\u30bf\u30d5\u30ec\u30fc\u30e0\u304b\u3089\u91cd\u8907\u3059\u308b\u3059\u3079\u3066\u306e\u884c\u3092\u524a\u9664\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/h3>\n<pre class=\"post-pre\"><code>result_df = source_df.drop_duplicates(keep=False)\r\nprint('Result DataFrame:\\n', result_df)\r\n<\/code><\/pre>\n<p>\u51fa\u529b\uff1a<\/p>\n<pre class=\"post-pre\"><code>Result DataFrame:\r\n    A  B  C\r\n2  1  2  4\r\n3  2  3  5\r\n<\/code><\/pre>\n<p>\u7d50\u679c\u306eDataFrame\u304b\u3089\u3001\u91cd\u8907\u3057\u305f\u884c\u306e &#8216;0&#8217; \u3068 &#8216;1&#8217; \u306f\u524a\u9664\u3055\u308c\u307e\u3059\u3002<\/p>\n<h3>4. \u7279\u5b9a\u306e\u5217\u306b\u57fa\u3065\u3044\u3066\u91cd\u8907\u3059\u308b\u884c\u3092\u7279\u5b9a\u3059\u308b<\/h3>\n<pre class=\"post-pre\"><code>import pandas as pd\r\n\r\nd1 = {'A': [1, 1, 1, 2], 'B': [2, 2, 2, 3], 'C': [3, 3, 4, 5]}\r\n\r\nsource_df = pd.DataFrame(d1)\r\nprint('Source DataFrame:\\n', source_df)\r\n\r\nresult_df = source_df.drop_duplicates(subset=['A', 'B'])\r\nprint('Result DataFrame:\\n', result_df)\r\n<\/code><\/pre>\n<p>\u51fa\u529b:<\/p>\n<pre class=\"post-pre\"><code>Source DataFrame:\r\n    A  B  C\r\n0  1  2  3\r\n1  1  2  3\r\n2  1  2  4\r\n3  2  3  5\r\nResult DataFrame:\r\n    A  B  C\r\n0  1  2  3\r\n3  2  3  5\r\n<\/code><\/pre>\n<p>\u5217\u300cA\u300d\u3068\u300cB\u300d\u306f\u3001\u91cd\u8907\u3059\u308b\u884c\u3092\u7279\u5b9a\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u3057\u305f\u304c\u3063\u3066\u3001\u884c0\u30011\u3001\u304a\u3088\u30732\u306f\u91cd\u8907\u3057\u3066\u3044\u307e\u3059\u3002\u3057\u305f\u304c\u3063\u3066\u3001\u884c1\u30682\u306f\u51fa\u529b\u304b\u3089\u524a\u9664\u3055\u308c\u307e\u3059\u3002<\/p>\n<h3>5. \u91cd\u8907\u3059\u308b\u884c\u3092\u73fe\u5834\u3067\u524a\u9664\u3059\u308b<\/h3>\n<pre class=\"post-pre\"><code>source_df.drop_duplicates(inplace=True)\r\nprint(source_df)\r\n<\/code><\/pre>\n<p>\u51fa\u529b\u3055\u308c\u308b\u3082\u306e\uff1a<\/p>\n<pre class=\"post-pre\"><code>   A  B  C\r\n0  1  2  3\r\n2  1  2  4\r\n3  2  3  5\r\n<\/code><\/pre>\n<h2>\u53c2\u8003\u6587\u732e<\/h2>\n<ul class=\"post-ul\">\n<li>Python Pandas Module Tutorial<\/li>\n<li>Pandas DataFrame drop_duplicates() API Doc<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u30d1\u30f3\u30c0\u306edrop_duplicates()\u95a2\u6570\u306e\u69cb\u6587 \u30d1\u30f3\u30c0\u306edrop_duplicates()\u95a2\u6570\u306f\u3001\u30c7\u30fc\u30bf\u30d5\u30ec\u30fc\u30e0\u304b\u3089\u91cd\u8907\u3059\u308b\u884c\u3092\u524a\u9664\u3057\u307e\u3059\u3002\u305d\u306e\u69cb\u6587\u306f\u6b21\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002 drop_duplicates(self, [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[26,61],"class_list":["post-636","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-26","tag-61"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ 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