{"id":27522,"date":"2024-03-16T08:36:40","date_gmt":"2024-03-16T08:36:40","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-can-you-add-a-new-column-and-assign-values-in-pandas\/"},"modified":"2024-03-22T11:14:26","modified_gmt":"2024-03-22T11:14:26","slug":"how-can-you-add-a-new-column-and-assign-values-in-pandas","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-can-you-add-a-new-column-and-assign-values-in-pandas\/","title":{"rendered":"How can you add a new column and assign values in pandas?"},"content":{"rendered":"<p>In Pandas, there are two methods available for adding a new column and assigning values.<\/p>\n<p>Option 1: Using the method of direct assignment.<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">import<\/span> pandas <span class=\"hljs-keyword\">as<\/span> pd\r\n\r\n<span class=\"hljs-comment\"># \u521b\u5efa\u4e00\u4e2aDataFrame<\/span>\r\ndata = {<span class=\"hljs-string\">'A'<\/span>: [<span class=\"hljs-number\">1<\/span>, <span class=\"hljs-number\">2<\/span>, <span class=\"hljs-number\">3<\/span>, <span class=\"hljs-number\">4<\/span>, <span class=\"hljs-number\">5<\/span>],\r\n        <span class=\"hljs-string\">'B'<\/span>: [<span class=\"hljs-string\">'a'<\/span>, <span class=\"hljs-string\">'b'<\/span>, <span class=\"hljs-string\">'c'<\/span>, <span class=\"hljs-string\">'d'<\/span>, <span class=\"hljs-string\">'e'<\/span>]}\r\ndf = pd.DataFrame(data)\r\n\r\n<span class=\"hljs-comment\"># \u65b0\u589e\u4e00\u5217\u5e76\u8d4b\u503c<\/span>\r\ndf[<span class=\"hljs-string\">'C'<\/span>] = [<span class=\"hljs-number\">6<\/span>, <span class=\"hljs-number\">7<\/span>, <span class=\"hljs-number\">8<\/span>, <span class=\"hljs-number\">9<\/span>, <span class=\"hljs-number\">10<\/span>]\r\n\r\n<span class=\"hljs-built_in\">print<\/span>(df)\r\n<\/code><\/pre>\n<p>Option 2: Utilizing the apply function.<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">import<\/span> pandas <span class=\"hljs-keyword\">as<\/span> pd\r\n\r\n<span class=\"hljs-comment\"># \u521b\u5efa\u4e00\u4e2aDataFrame<\/span>\r\ndata = {<span class=\"hljs-string\">'A'<\/span>: [<span class=\"hljs-number\">1<\/span>, <span class=\"hljs-number\">2<\/span>, <span class=\"hljs-number\">3<\/span>, <span class=\"hljs-number\">4<\/span>, <span class=\"hljs-number\">5<\/span>],\r\n        <span class=\"hljs-string\">'B'<\/span>: [<span class=\"hljs-string\">'a'<\/span>, <span class=\"hljs-string\">'b'<\/span>, <span class=\"hljs-string\">'c'<\/span>, <span class=\"hljs-string\">'d'<\/span>, <span class=\"hljs-string\">'e'<\/span>]}\r\ndf = pd.DataFrame(data)\r\n\r\n<span class=\"hljs-comment\"># \u5b9a\u4e49\u4e00\u4e2a\u51fd\u6570\u6765\u8d4b\u503c<\/span>\r\n<span class=\"hljs-keyword\">def<\/span> <span class=\"hljs-title function_\">assign_value<\/span>(<span class=\"hljs-params\">row<\/span>):\r\n    <span class=\"hljs-keyword\">return<\/span> row[<span class=\"hljs-string\">'A'<\/span>] * <span class=\"hljs-number\">2<\/span>\r\n\r\n<span class=\"hljs-comment\"># \u4f7f\u7528apply\u51fd\u6570\u65b0\u589e\u4e00\u5217\u5e76\u8d4b\u503c<\/span>\r\ndf[<span class=\"hljs-string\">'C'<\/span>] = df.apply(assign_value, axis=<span class=\"hljs-number\">1<\/span>)\r\n\r\n<span class=\"hljs-built_in\">print<\/span>(df)\r\n<\/code><\/pre>\n<p>You can add a new column and assign a value in a DataFrame using any method.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In Pandas, there are two methods available for adding a new column and assigning values. Option 1: Using the method of direct assignment. import pandas as pd # \u521b\u5efa\u4e00\u4e2aDataFrame data = {&#8216;A&#8217;: [1, 2, 3, 4, 5], &#8216;B&#8217;: [&#8216;a&#8217;, &#8216;b&#8217;, &#8216;c&#8217;, &#8216;d&#8217;, &#8216;e&#8217;]} df = pd.DataFrame(data) # \u65b0\u589e\u4e00\u5217\u5e76\u8d4b\u503c df[&#8216;C&#8217;] = [6, 7, 8, 9, 10] [&hellip;]<\/p>\n","protected":false},"author":14,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-27522","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How can you add a new column and assign values in pandas? - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/blog\/how-can-you-add-a-new-column-and-assign-values-in-pandas\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How can you add a new column and assign values in pandas?\" \/>\n<meta property=\"og:description\" content=\"In Pandas, there are two methods available for adding a new column and assigning values. Option 1: Using the method of direct assignment. import pandas as pd # \u521b\u5efa\u4e00\u4e2aDataFrame data = {&#039;A&#039;: [1, 2, 3, 4, 5], &#039;B&#039;: [&#039;a&#039;, &#039;b&#039;, &#039;c&#039;, &#039;d&#039;, &#039;e&#039;]} df = pd.DataFrame(data) # \u65b0\u589e\u4e00\u5217\u5e76\u8d4b\u503c df[&#039;C&#039;] = [6, 7, 8, 9, 10] [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/blog\/how-can-you-add-a-new-column-and-assign-values-in-pandas\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/SiliCloudGlobal\/\" \/>\n<meta property=\"article:published_time\" content=\"2024-03-16T08:36:40+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-03-22T11:14:26+00:00\" \/>\n<meta name=\"author\" content=\"Noah Thompson\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@SiliCloudGlobal\" \/>\n<meta name=\"twitter:site\" content=\"@SiliCloudGlobal\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Noah Thompson\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-can-you-add-a-new-column-and-assign-values-in-pandas\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-can-you-add-a-new-column-and-assign-values-in-pandas\/\"},\"author\":{\"name\":\"Noah Thompson\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/#\/schema\/person\/2e83cc6ab9f60d36921c2d0f9f280f4a\"},\"headline\":\"How can you add a new column and assign values in pandas?\",\"datePublished\":\"2024-03-16T08:36:40+00:00\",\"dateModified\":\"2024-03-22T11:14:26+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-can-you-add-a-new-column-and-assign-values-in-pandas\/\"},\"wordCount\":55,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/www.silicloud.com\/blog\/#organization\"},\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.silicloud.com\/blog\/how-can-you-add-a-new-column-and-assign-values-in-pandas\/\",\"url\":\"https:\/\/www.silicloud.com\/blog\/how-can-you-add-a-new-column-and-assign-values-in-pandas\/\",\"name\":\"How can you add a new column and assign values in pandas? 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