{"id":1568,"date":"2020-02-08T15:35:36","date_gmt":"2020-02-08T06:35:36","guid":{"rendered":"https:\/\/itips.krsw.biz\/?p=1568"},"modified":"2020-02-08T15:35:36","modified_gmt":"2020-02-08T06:35:36","slug":"python-remove-none-from-list","status":"publish","type":"post","link":"https:\/\/itips.krsw.biz\/en\/python-remove-none-from-list\/","title":{"rendered":"[Python] Remove None from list object"},"content":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/itips.krsw.biz\/wp-content\/uploads\/2018\/12\/code_1545140786-1024x683.jpg\" alt=\"[Python] Remove None from list object\" width=\"800\" height=\"534\" class=\"aligncenter size-large wp-image-139\" srcset=\"https:\/\/itips.krsw.biz\/wp-content\/uploads\/2018\/12\/code_1545140786-1024x683.jpg 1024w, https:\/\/itips.krsw.biz\/wp-content\/uploads\/2018\/12\/code_1545140786-640x427.jpg 640w, https:\/\/itips.krsw.biz\/wp-content\/uploads\/2018\/12\/code_1545140786-800x534.jpg 800w, https:\/\/itips.krsw.biz\/wp-content\/uploads\/2018\/12\/code_1545140786-320x214.jpg 320w, https:\/\/itips.krsw.biz\/wp-content\/uploads\/2018\/12\/code_1545140786-768x512.jpg 768w, https:\/\/itips.krsw.biz\/wp-content\/uploads\/2018\/12\/code_1545140786-400x267.jpg 400w, https:\/\/itips.krsw.biz\/wp-content\/uploads\/2018\/12\/code_1545140786-300x200.jpg 300w, https:\/\/itips.krsw.biz\/wp-content\/uploads\/2018\/12\/code_1545140786.jpg 1280w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/p>\n<p>We want to remove None from list object.<br \/>\nWhen we process data, sometimes it contains None value.<br \/>\nNone is not integer nor string.<br \/>\nSo it is not easy to use.<br \/>\nToday I introduce how to remove None from list object.<\/p>\n<p><!--more--><\/p>\n<p><\/br><\/p>\n<h2>How to remove None from list object<\/h2>\n<p>Remove None from list object.<br \/>\nIt means <strong><span style=\"font-size: 150%; color: blue;\">keeping values except None<\/span><\/strong>.<\/p>\n<p>To say abstractly, it keeps values <strong>which meets particular condition<\/strong>.<\/p>\n<p>There are 4 methods.<\/p>\n<ul>\n<li>filter<\/li>\n<li>filter + lambda<\/li>\n<li>function in the list<\/li>\n<li>function in the list with &quot;is not None&quot; condition<\/li>\n<\/ul>\n<p>So I will introduce each methods with following list.<\/p>\n<pre class=\"prettyprint lang-python\">\nlist_a = &#091;0, 1, 2, 3, None, 5, 6, 7&#093;\nprint(list_a)\n# &#091;0, 1, 2, 3, None, 5, 6, 7&#093;\n<\/pre>\n<p><\/br><\/p>\n<h3>filter<\/h3>\n<p>In order to use filter, we should set <code>None<\/code> and <code>list object<\/code> in filter function.<\/p>\n<p>Then it returns filter ofject.<br \/>\nOnce you convert it to list ofject, you can see its content.<\/p>\n<pre class=\"prettyprint lang-python\">\nlist_a_filtered = filter(None, list_a)\nprint(list_a_filtered)\nprint(list(list_a_filtered))\n# \uff1cfilter object at 0x0000025F40A48358\uff1e\n# &#091;1, 2, 3, 5, 6, 7&#093;\n<\/pre>\n<p><\/br><\/br><\/p>\n<p>It filters <code>0<\/code> and <code>None<\/code>.<br \/>\nIn the function, <code>0<\/code> and <code>None<\/code> are evaluated as <code>False<\/code>.<br \/>\nSo they are filtered.<\/p>\n<p><\/br><\/p>\n<h3>filter + lambda<\/h3>\n<p>If you want to use lambda in filter function, its code will be like below.<\/p>\n<pre class=\"prettyprint lang-python\">\nlist_a_filtered = filter(lambda a:a is not None, list_a)\nprint(list(list_a_filtered))\n# &#091;0, 1, 2, 3, 5, 6, 7&#093;\n<\/pre>\n<p><\/br><\/br><\/p>\n<p>In this case, only <code>None<\/code> is filtered.<\/p>\n<p>Lambda condition is applied to each value in the list.<br \/>\nThen it returns a list whose values meet the <code>is not None<\/code> condition.<\/p>\n<p><\/br><\/p>\n<h3>Function in the list<\/h3>\n<p>If we use function in the list, code will be like following.<\/p>\n<pre class=\"prettyprint lang-python\">\nlist_a_filtered = &#091;x for x in list_a if x&#093;\nprint(list_a_filtered)\n# &#091;1, 2, 3, 5, 6, 7&#093;\n<\/pre>\n<p><\/br><\/br><\/p>\n<p>This solution also returns list that does not contains <code>0<\/code>.<br \/>\n<code>0<\/code> is evaluated as <code>False<\/code>.<\/p>\n<p><\/br><\/p>\n<h3>Function in the list with &quot;is not None&quot; condition<\/h3>\n<p>If you want to keep <code>0<\/code>, you can use the condition <code>is not None<\/code>.<\/p>\n<pre class=\"prettyprint lang-python\">\nlist_a_filtered = &#091;x for x in list_a if x is not None&#093;\nprint(list_a_filtered)\n# &#091;0, 1, 2, 3, 5, 6, 7&#093;\n<\/pre>\n<p><\/br><\/br><\/p>\n<p>Then it keeps <code>0<\/code> and filters <code>None<\/code>.<\/p>\n<p><\/br><\/p>\n<h2>Finally<\/h2>\n<p>When you want to remove None from list ofject, you can use <strong>filter<\/strong> or <strong>function in list<\/strong>.<br \/>\nWith using <code>is not None<\/code> condition, you can filter <code>None<\/code> only.<\/p>\n<p><\/br><\/p>\n<div class=\"st-mybox  has-title st-mybox-class\" style=\"background:#f3f3f3;border-color:#e3e3e3;border-width:1px;border-radius:5px;margin: 25px 0 25px 0;\"><p class=\"st-mybox-title\" style=\"color:#757575;font-weight:bold;text-shadow: #fff 3px 0px 0px, #fff 2.83487px 0.981584px 0px, #fff 2.35766px 1.85511px 0px, #fff 1.62091px 2.52441px 0px, #fff 0.705713px 2.91581px 0px, #fff -0.287171px 2.98622px 0px, #fff -1.24844px 2.72789px 0px, #fff -2.07227px 2.16926px 0px, #fff -2.66798px 1.37182px 0px, #fff -2.96998px 0.42336px 0px, #fff -2.94502px -0.571704px 0px, #fff -2.59586px -1.50383px 0px, #fff -1.96093px -2.27041px 0px, #fff -1.11013px -2.78704px 0px, #fff -0.137119px -2.99686px 0px, #fff 0.850987px -2.87677px 0px, #fff 1.74541px -2.43999px 0px, #fff 2.44769px -1.73459px 0px, #fff 2.88051px -0.838246px 0px;\"><i class=\"fa fa-check-circle st-css-no\" aria-hidden=\"true\"><\/i>Code<\/p><div class=\"st-in-mybox\"><a href=\"https:\/\/github.com\/yKRSW\/sample_remove_none_from_list\">yKRSW\/sample_remove_none_from_list<\/a><br \/>\n<\/div><\/div>\n<div class=\"st-mybox  has-title st-mybox-class\" style=\"background:#f3f3f3;border-color:#e3e3e3;border-width:1px;border-radius:5px;margin: 25px 0 25px 0;\"><p class=\"st-mybox-title\" style=\"color:#757575;font-weight:bold;text-shadow: #fff 3px 0px 0px, #fff 2.83487px 0.981584px 0px, #fff 2.35766px 1.85511px 0px, #fff 1.62091px 2.52441px 0px, #fff 0.705713px 2.91581px 0px, #fff -0.287171px 2.98622px 0px, #fff -1.24844px 2.72789px 0px, #fff -2.07227px 2.16926px 0px, #fff -2.66798px 1.37182px 0px, #fff -2.96998px 0.42336px 0px, #fff -2.94502px -0.571704px 0px, #fff -2.59586px -1.50383px 0px, #fff -1.96093px -2.27041px 0px, #fff -1.11013px -2.78704px 0px, #fff -0.137119px -2.99686px 0px, #fff 0.850987px -2.87677px 0px, #fff 1.74541px -2.43999px 0px, #fff 2.44769px -1.73459px 0px, #fff 2.88051px -0.838246px 0px;\"><i class=\"fa fa-check-circle st-css-no\" aria-hidden=\"true\"><\/i>Refference<\/p><div class=\"st-in-mybox\"><a href=\"https:\/\/dackdive.hateblo.jp\/entry\/2014\/08\/25\/172414\">[python]\u30ea\u30b9\u30c8\u304b\u3089None\u3092\u9664\u5916\u3059\u308b\u7c21\u5358\u306a\u66f8\u304d\u65b9 - dackdive&apos;s blog<\/a><br \/>\n<a href=\"https:\/\/stackoverflow.com\/questions\/16096754\/remove-none-value-from-a-list-without-removing-the-0-value\">python - remove None value from a list without removing the 0 value - Stack Overflow<\/a><br \/>\n<\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>We want to remove None from list object. When we process data, sometimes it contains None value. Non &#8230; <\/p>\n","protected":false},"author":1,"featured_media":139,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_locale":"en_US","_original_post":"1564","footnotes":""},"categories":[6],"tags":[],"class_list":["post-1568","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-python","en-US"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>[Python] Remove None from list object - ITips\u30b7\u30b9\u30c6\u30e0\u30bd\u30ea\u30e5\u30fc\u30b7\u30e7\u30f3\u30ba<\/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:\/\/itips.krsw.biz\/en\/python-remove-none-from-list\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Python] Remove None from list object - ITips\u30b7\u30b9\u30c6\u30e0\u30bd\u30ea\u30e5\u30fc\u30b7\u30e7\u30f3\u30ba\" \/>\n<meta property=\"og:description\" content=\"We want to remove None from list object. 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