{"id":1732,"date":"2023-07-25T05:15:38","date_gmt":"2023-07-25T05:15:38","guid":{"rendered":"https:\/\/statorials.org\/nl\/pandas-combineren-twee-kolommen\/"},"modified":"2023-07-25T05:15:38","modified_gmt":"2023-07-25T05:15:38","slug":"pandas-combineren-twee-kolommen","status":"publish","type":"post","link":"https:\/\/statorials.org\/nl\/pandas-combineren-twee-kolommen\/","title":{"rendered":"Hoe twee kolommen in panda&#39;s te combineren (met voorbeelden)"},"content":{"rendered":"<p><\/p>\n<hr>\n<p><span style=\"color: #000000;\">U kunt de volgende syntaxis gebruiken om twee tekstkolommen te combineren tot \u00e9\u00e9n in een pandas DataFrame:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong>df[' <span style=\"color: #ff0000;\">new_column<\/span> '] = df[' <span style=\"color: #ff0000;\">column1<\/span> '] + df[' <span style=\"color: #ff0000;\">column2<\/span> ']\n<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">Als een van de kolommen nog geen string is, kun je deze converteren met de opdracht <strong>astype(str)<\/strong> :<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong>df[' <span style=\"color: #ff0000;\">new_column<\/span> '] = df[' <span style=\"color: #ff0000;\">column1<\/span> ']. <span style=\"color: #3366ff;\">astype<\/span> ( <span style=\"color: #008000;\">str<\/span> )+df[' <span style=\"color: #ff0000;\">column2<\/span> ']<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">En u kunt de volgende syntaxis gebruiken om meerdere tekstkolommen in \u00e9\u00e9n te combineren:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong>df[' <span style=\"color: #ff0000;\">new_column<\/span> '] = df[[' <span style=\"color: #ff0000;\">col1<\/span> ', ' <span style=\"color: #ff0000;\">col2<\/span> ', ' <span style=\"color: #ff0000;\">col3<\/span> ', ...]]. <span style=\"color: #3366ff;\">agg<\/span> (' '. <span style=\"color: #3366ff;\">join<\/span> , axis= <span style=\"color: #008000;\">1<\/span> )<\/strong><\/pre>\n<p> <span style=\"color: #000000;\">De volgende voorbeelden laten zien hoe u tekstkolommen in de praktijk kunt combineren.<\/span><\/p>\n<h3> <span style=\"color: #000000;\"><strong>Voorbeeld 1: Combineer twee kolommen<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">De volgende code laat zien hoe u twee tekstkolommen combineert tot \u00e9\u00e9n in een pandas DataFrame:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008000;\">import<\/span> pandas <span style=\"color: #008000;\">as<\/span> pd\n\n<span style=\"color: #008080;\">#create dataFrame<\/span>\ndf = pd. <span style=\"color: #3366ff;\">DataFrame<\/span> ({' <span style=\"color: #ff0000;\">team<\/span> ': ['Mavs', 'Lakers', 'Spurs', 'Cavs'],\n                   ' <span style=\"color: #ff0000;\">first<\/span> ': ['Dirk', 'Kobe', 'Tim', 'Lebron'],\n                   ' <span style=\"color: #ff0000;\">last<\/span> ': ['Nowitzki', 'Bryant', 'Duncan', 'James'],\n                   ' <span style=\"color: #ff0000;\">points<\/span> ': [26, 31, 22, 29]})\n\n<span style=\"color: #008080;\">#combine first and last name column into new column, with space in between<\/span>\ndf[' <span style=\"color: #ff0000;\">full_name<\/span> '] = df[' <span style=\"color: #ff0000;\">first<\/span> '] + ' ' + df[' <span style=\"color: #ff0000;\">last<\/span> ']\n\n<span style=\"color: #008080;\">#view resulting dataFrame\n<span style=\"color: #000000;\">df<\/span>\n\n<span style=\"color: #000000;\">team first last<\/span> <span style=\"color: #000000;\">points full_name\n0 Mavs Dirk Nowitzki<\/span> <span style=\"color: #000000;\">26 Dirk Nowitzki\n1 Lakers Kobe Bryant<\/span> <span style=\"color: #000000;\">31 Kobe Bryant\n2 Spurs Tim Duncan<\/span> <span style=\"color: #000000;\">22 Tim Duncan\n3 Cavs LeBron James<\/span> <span style=\"color: #000000;\">29 LeBron James\n<\/span><\/span><\/strong><\/pre>\n<p> <span style=\"color: #000000;\">We hebben de voor- en achternaamkolom samengevoegd met een spatie ertussen, maar we kunnen ook een ander scheidingsteken gebruiken, zoals een koppelteken:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008080;\">#combine first and last name column into new column, with dash in between<\/span>\ndf[' <span style=\"color: #ff0000;\">full_name<\/span> '] = df[' <span style=\"color: #ff0000;\">first<\/span> '] + ' <span style=\"color: #ff0000;\">-<\/span> ' + df[' <span style=\"color: #ff0000;\">last<\/span> ']\n\n<span style=\"color: #008080;\">#view resulting dataFrame\n<span style=\"color: #000000;\">df<\/span>\n\n<span style=\"color: #000000;\">team first last<\/span> <span style=\"color: #000000;\">points full_name\n0 Mavs Dirk Nowitzki<\/span> <span style=\"color: #000000;\">26 Dirk<\/span> - <span style=\"color: #000000;\">Nowitzki\n1 Lakers Kobe Bryant<\/span> <span style=\"color: #000000;\">31 Kobe<\/span> - <span style=\"color: #000000;\">Bryant\n2 Spurs Tim Duncan<\/span> <span style=\"color: #000000;\">22 Tim<\/span> - <span style=\"color: #000000;\">Duncan\n3 Cavs Lebron James<\/span> <span style=\"color: #000000;\">29 Lebron<\/span> - <span style=\"color: #000000;\">James<\/span><\/span><\/strong><\/pre>\n<h3> <span style=\"color: #000000;\"><strong>Voorbeeld 2: Converteren naar tekst en twee kolommen combineren<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">De volgende code laat zien hoe u een kolom naar tekst converteert en deze vervolgens aan een andere kolom koppelt:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008000;\">import<\/span> pandas <span style=\"color: #008000;\">as<\/span> pd\n\n<span style=\"color: #008080;\">#create dataFrame<\/span>\ndf = pd. <span style=\"color: #3366ff;\">DataFrame<\/span> ({' <span style=\"color: #ff0000;\">team<\/span> ': ['Mavs', 'Lakers', 'Spurs', 'Cavs'],\n                   ' <span style=\"color: #ff0000;\">first<\/span> ': ['Dirk', 'Kobe', 'Tim', 'Lebron'],\n                   ' <span style=\"color: #ff0000;\">last<\/span> ': ['Nowitzki', 'Bryant', 'Duncan', 'James'],\n                   ' <span style=\"color: #ff0000;\">points<\/span> ': [26, 31, 22, 29]})\n\n<span style=\"color: #008080;\">#convert points to text, then join to last name column<\/span>\ndf[' <span style=\"color: #ff0000;\">name_points<\/span> '] = df[' <span style=\"color: #ff0000;\">last<\/span> '] + df[' <span style=\"color: #ff0000;\">points<\/span> ']. <span style=\"color: #3366ff;\">astype<\/span> ( <span style=\"color: #008000;\">str<\/span> )\n\n<span style=\"color: #008080;\">#view resulting dataFrame\n<span style=\"color: #000000;\">df<\/span>\n\n        <span style=\"color: #000000;\">team first last<\/span> <span style=\"color: #000000;\">points name_points\n0 Mavs Dirk Nowitzki<\/span> <span style=\"color: #000000;\">26 Nowitzki26\n1 Lakers Kobe Bryant<\/span> <span style=\"color: #000000;\">31 Bryant31\n2 Spurs Tim Duncan<\/span> <span style=\"color: #000000;\">22 Duncan22\n3 Cavs LeBron James<\/span> <span style=\"color: #000000;\">29 James29<\/span><\/span><\/strong><\/pre>\n<h3> <span style=\"color: #000000;\"><strong>Voorbeeld 3: Combineer meer dan twee kolommen<\/strong><\/span><\/h3>\n<p> <span style=\"color: #000000;\">De volgende code laat zien hoe u meerdere kolommen samenvoegt tot \u00e9\u00e9n:<\/span><\/p>\n<pre style=\"background-color: #ececec; font-size: 15px;\"> <strong><span style=\"color: #008000;\">import<\/span> pandas <span style=\"color: #008000;\">as<\/span> pd\n\n<span style=\"color: #008080;\">#create dataFrame<\/span>\ndf = pd. <span style=\"color: #3366ff;\">DataFrame<\/span> ({' <span style=\"color: #ff0000;\">team<\/span> ': ['Mavs', 'Lakers', 'Spurs', 'Cavs'],\n                   ' <span style=\"color: #ff0000;\">first<\/span> ': ['Dirk', 'Kobe', 'Tim', 'Lebron'],\n                   ' <span style=\"color: #ff0000;\">last<\/span> ': ['Nowitzki', 'Bryant', 'Duncan', 'James'],\n                   ' <span style=\"color: #ff0000;\">points<\/span> ': [26, 31, 22, 29]})\n\n<span style=\"color: #008080;\">#join team, first name, and last name into one column<\/span>\ndf[' <span style=\"color: #ff0000;\">team_and_name<\/span> '] = df[[' <span style=\"color: #ff0000;\">team<\/span> ', ' <span style=\"color: #ff0000;\">first<\/span> ', ' <span style=\"color: #ff0000;\">last<\/span> ']]. <span style=\"color: #3366ff;\">agg<\/span> (' '. <span style=\"color: #3366ff;\">join<\/span> , axis= <span style=\"color: #008000;\">1<\/span> )\n\n<span style=\"color: #008080;\">#view resulting dataFrame\n<span style=\"color: #000000;\">df<\/span>\n\n<span style=\"color: #000000;\">team first last points team_name\n0 Mavs Dirk Nowitzki 26 Mavs Dirk Nowitzki\n1 Lakers Kobe Bryant 31 Lakers Kobe Bryant\n2 Spurs Tim Duncan 22 Spurs Tim Duncan\n3 Cavs Lebron James 29 Cavs Lebron James<\/span><\/span><\/strong><\/pre>\n<h3> <span style=\"color: #000000;\"><strong>Aanvullende bronnen<\/strong><\/span><\/h3>\n<p> <a href=\"https:\/\/statorials.org\/nl\/pandas-verschil-tussen-twee-kolommen\/\" target=\"_blank\" rel=\"noopener\">Panda&#8217;s: hoe u het verschil tussen twee kolommen kunt vinden<\/a><br \/> <a href=\"https:\/\/statorials.org\/nl\/pandas-verschil-tussen-rijen\/\" target=\"_blank\" rel=\"noopener\">Panda&#8217;s: hoe je het verschil tussen twee lijnen kunt vinden<\/a><br \/> <a href=\"https:\/\/statorials.org\/nl\/pandas-sorteren-kolommen-op-naam\/\" target=\"_blank\" rel=\"noopener\">Panda&#8217;s: kolommen op naam sorteren<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>U kunt de volgende syntaxis gebruiken om twee tekstkolommen te combineren tot \u00e9\u00e9n in een pandas DataFrame: df[&#8218; new_column &#8218;] = df[&#8218; column1 &#8218;] + df[&#8218; column2 &#8218;] Als een van de kolommen nog geen string is, kun je deze converteren met de opdracht astype(str) : df[&#8218; new_column &#8218;] = df[&#8218; column1 &#8218;]. astype ( [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11],"tags":[],"class_list":["post-1732","post","type-post","status-publish","format-standard","hentry","category-gids"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Hoe twee kolommen in panda&#039;s te combineren (met voorbeelden)<\/title>\n<meta name=\"description\" content=\"In deze tutorial wordt uitgelegd hoe u twee kolommen in een pandas DataFrame combineert, met verschillende voorbeelden.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/statorials.org\/nl\/pandas-combineren-twee-kolommen\/\" \/>\n<meta property=\"og:locale\" content=\"de_DE\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Hoe twee kolommen in panda&#039;s te combineren (met voorbeelden)\" \/>\n<meta property=\"og:description\" content=\"In deze tutorial wordt uitgelegd hoe u twee kolommen in een pandas DataFrame combineert, met verschillende voorbeelden.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/statorials.org\/nl\/pandas-combineren-twee-kolommen\/\" \/>\n<meta property=\"og:site_name\" content=\"Statorials\" \/>\n<meta property=\"article:published_time\" content=\"2023-07-25T05:15:38+00:00\" \/>\n<meta name=\"author\" content=\"Dr.benjamin anderson\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Verfasst von\" \/>\n\t<meta name=\"twitter:data1\" content=\"Dr.benjamin anderson\" \/>\n\t<meta name=\"twitter:label2\" content=\"Gesch\u00e4tzte Lesezeit\" \/>\n\t<meta name=\"twitter:data2\" content=\"3\u00a0Minuten\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/statorials.org\/nl\/pandas-combineren-twee-kolommen\/\",\"url\":\"https:\/\/statorials.org\/nl\/pandas-combineren-twee-kolommen\/\",\"name\":\"Hoe twee kolommen in panda&#39;s te combineren (met voorbeelden)\",\"isPartOf\":{\"@id\":\"https:\/\/statorials.org\/nl\/#website\"},\"datePublished\":\"2023-07-25T05:15:38+00:00\",\"dateModified\":\"2023-07-25T05:15:38+00:00\",\"author\":{\"@id\":\"https:\/\/statorials.org\/nl\/#\/schema\/person\/d4b8842173cca1bb62cdec41860e4219\"},\"description\":\"In deze tutorial wordt uitgelegd hoe u twee kolommen in een pandas DataFrame combineert, met verschillende voorbeelden.\",\"breadcrumb\":{\"@id\":\"https:\/\/statorials.org\/nl\/pandas-combineren-twee-kolommen\/#breadcrumb\"},\"inLanguage\":\"de\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/statorials.org\/nl\/pandas-combineren-twee-kolommen\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/statorials.org\/nl\/pandas-combineren-twee-kolommen\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Thuis\",\"item\":\"https:\/\/statorials.org\/nl\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Hoe twee kolommen in panda&#39;s te combineren (met voorbeelden)\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/statorials.org\/nl\/#website\",\"url\":\"https:\/\/statorials.org\/nl\/\",\"name\":\"Statorials\",\"description\":\"Uw gids voor statistische competentie\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/statorials.org\/nl\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"de\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/statorials.org\/nl\/#\/schema\/person\/d4b8842173cca1bb62cdec41860e4219\",\"name\":\"Dr.benjamin anderson\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"de\",\"@id\":\"https:\/\/statorials.org\/nl\/#\/schema\/person\/image\/\",\"url\":\"http:\/\/statorials.org\/nl\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg\",\"contentUrl\":\"http:\/\/statorials.org\/nl\/wp-content\/uploads\/2023\/10\/Dr.-Benjamin-Anderson-96x96.jpg\",\"caption\":\"Dr.benjamin anderson\"},\"description\":\"Ik ben Benjamin, een gepensioneerde hoogleraar statistiek die nu een toegewijde Statorials-lesgever is. 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