{"id":8511,"date":"2024-03-14T08:13:45","date_gmt":"2024-03-14T08:13:45","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-is-the-isnull-function-used-in-python\/"},"modified":"2025-08-03T05:57:37","modified_gmt":"2025-08-03T05:57:37","slug":"how-is-the-isnull-function-used-in-python","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-is-the-isnull-function-used-in-python\/","title":{"rendered":"Pandas isnull(): Check Missing Values"},"content":{"rendered":"<p>The isnull() function in Python is a function within the pandas library used to check for missing values in data. Its specific usage is as follows:<\/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\u4e2a\u5305\u542b\u7f3a\u5931\u503c\u7684DataFrame<\/span>\r\ndata = {<span class=\"hljs-string\">'A'<\/span>: [<span class=\"hljs-number\">1<\/span>, <span class=\"hljs-number\">2<\/span>, <span class=\"hljs-literal\">None<\/span>, <span class=\"hljs-number\">4<\/span>],\r\n        <span class=\"hljs-string\">'B'<\/span>: [<span class=\"hljs-literal\">None<\/span>, <span class=\"hljs-number\">5<\/span>, <span class=\"hljs-number\">6<\/span>, <span class=\"hljs-number\">7<\/span>]}\r\ndf = pd.DataFrame(data)\r\n\r\n<span class=\"hljs-comment\"># \u4f7f\u7528isnull()\u51fd\u6570\u68c0\u67e5\u7f3a\u5931\u503c<\/span>\r\n<span class=\"hljs-built_in\">print<\/span>(df.isnull())\r\n<\/code><\/pre>\n<p>The output is as follows:<\/p>\n<pre class=\"post-pre\"><code>       A      B\r\n0  False   True\r\n1  False  False\r\n2   True  False\r\n3  False  False\r\n<\/code><\/pre>\n<p>The isnull() function will return a boolean DataFrame of the same dimensions as the original DataFrame, where True indicates that the corresponding value is missing, and False indicates that it is not missing.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The isnull() function in Python is a function within the pandas library used to check for missing values in data. Its specific usage is as follows: import pandas as pd # \u521b\u5efa\u4e00\u4e2a\u5305\u542b\u7f3a\u5931\u503c\u7684DataFrame data = {&#8216;A&#8217;: [1, 2, None, 4], &#8216;B&#8217;: [None, 5, 6, 7]} df = pd.DataFrame(data) # \u4f7f\u7528isnull()\u51fd\u6570\u68c0\u67e5\u7f3a\u5931\u503c print(df.isnull()) The output is as follows: [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_import_markdown_pro_load_document_selector":0,"_import_markdown_pro_submit_text_textarea":"","footnotes":""},"categories":[1],"tags":[775,11519,2426,1094,72],"class_list":["post-8511","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-data-cleaning","tag-isnull","tag-missing-data","tag-pandas","tag-python"],"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>Pandas isnull(): Check Missing Values - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Learn how to use pandas isnull() function to detect missing values in data. Includes code example and output explanation.\" \/>\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-is-the-isnull-function-used-in-python\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Pandas isnull(): Check Missing Values\" \/>\n<meta property=\"og:description\" content=\"Learn how to use pandas isnull() function to detect missing values in data. 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