{"id":8518,"date":"2024-03-14T08:14:32","date_gmt":"2024-03-14T08:14:32","guid":{"rendered":"https:\/\/www.silicloud.com\/blog\/how-to-use-isnull-to-determine-missing-values-in-python\/"},"modified":"2025-08-03T06:02:30","modified_gmt":"2025-08-03T06:02:30","slug":"how-to-use-isnull-to-determine-missing-values-in-python","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/blog\/how-to-use-isnull-to-determine-missing-values-in-python\/","title":{"rendered":"Python isnull(): Find Missing Values"},"content":{"rendered":"<p>In Python, the isnull() method is typically used to determine missing values through the Series or DataFrame objects in the pandas library. Here is an example:<\/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-string\">'B'<\/span>: [<span class=\"hljs-number\">3<\/span>, <span class=\"hljs-literal\">None<\/span>, <span class=\"hljs-number\">5<\/span>]}\r\ndf = pd.DataFrame(data)\r\n\r\n<span class=\"hljs-comment\"># \u5224\u65adDataFrame\u4e2d\u7684\u7f3a\u5931\u503c<\/span>\r\n<span class=\"hljs-built_in\">print<\/span>(df.isnull())\r\n<\/code><\/pre>\n<p>The output yields:<\/p>\n<pre class=\"post-pre\"><code>       A      B\r\n0  False  False\r\n1  False   True\r\n2   True  False\r\n<\/code><\/pre>\n<p>In this example, the isnull() method will return a DataFrame of boolean values, where True indicates that the value at the corresponding position is missing, and False indicates that the value at the corresponding position is not missing.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In Python, the isnull() method is typically used to determine missing values through the Series or DataFrame objects in the pandas library. Here is an example: import pandas as pd # \u521b\u5efa\u4e00\u4e2a\u5305\u542b\u7f3a\u5931\u503c\u7684DataFrame data = {&#8216;A&#8217;: [1, 2, None], &#8216;B&#8217;: [3, None, 5]} df = pd.DataFrame(data) # \u5224\u65adDataFrame\u4e2d\u7684\u7f3a\u5931\u503c print(df.isnull()) The output yields: A B 0 False [&hellip;]<\/p>\n","protected":false},"author":9,"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":[775,11533,11535,11534,11532],"class_list":["post-8518","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-data-cleaning","tag-pandas-missing-values","tag-pandas-tutorial","tag-python-data-analysis","tag-python-isnull"],"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>Python isnull(): Find Missing Values - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" content=\"Learn to detect missing data in pandas using Python&#039;s isnull(). 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