{"id":1506,"date":"2023-01-18T20:00:00","date_gmt":"2023-01-18T11:00:00","guid":{"rendered":"https:\/\/python-academia.com\/en\/?p=1506"},"modified":"2022-10-30T08:15:19","modified_gmt":"2022-10-29T23:15:19","slug":"list-count","status":"publish","type":"post","link":"https:\/\/python-academia.com\/en\/list-count\/","title":{"rendered":"[Python] How to Count List Elements [length, duplicates]"},"content":{"rendered":"\n<p>This article shows <span class=\"st-mymarker-s\">how to count list elements<\/span>.<\/p>\n\n\n\n<div class=\"wp-block-st-blocks-midashi-box freebox has-title\" style=\"background-color:#eceff1;border-color:#263238;border-radius:0 5px 5px 5px\"><p class=\"p-free\" style=\"border-color:#263238;font-weight:bold\"><span class=\"p-entry-f\" style=\"color:#ffffff;font-weight:bold;background-color:#263238;border-radius:0 0 5px 0\"><i class=\"st-fa st-svg-file-text-o st-css-no\" aria-hidden=\"\"><\/i>Contents<\/span><\/p><div class=\"free-inbox\">\n<p><\/p>\n\n\n\n<ul><li>How to count elements in list  ( Get list size ).<\/li><li>How to count elements in two-dimensional list.<\/li><li>How to count the number of specific elements in list<\/li><\/ul>\n\n\n\n<p><\/p>\n<\/div><\/div>\n\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">How to count elements in list ( Get list size ).<\/h2>\n\n\n\n<p>I show <span class=\"st-mymarker-s\">how to count elements in list<\/span>.<\/p>\n\n\n\n<p>The &#8220;len() function&#8221; can be used to get the number of elements in list.<\/p>\n\n\n\n<p>The &#8220;len() function&#8221; is built-in function in Python.<\/p>\n\n\n<div class=\"st-mybox  has-title st-mybox-class\" style=\"background:#E3F2FD;border-color:#2196F3;border-width:3px;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;background: linear-gradient(0deg,#E3F2FD 0%,#E3F2FD 55%,rgba(0,0,0,0) 55%,rgba(0,0,0,0) 100%);\">How to write<\/p><div class=\"st-in-mybox\">\n<p>len( List )<\/p>\n<\/div><\/div>\n\n\n\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>Here is an example code.<\/p>\n\n\n\n<pre class=\"wp-block-code line-numbers language-Python\"><code>list_1 = &#091;\"Apple\", \"Banana\", \"Orange\", \"Bana\", \"Banana\"]\n\nprint(len(list_1))\n# 5<\/code><\/pre>\n\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p style=\"color:#666;margin-bottom:5px;\">sponsored link<\/p>\n\n<table>\n<tbody>\n<tr>\n<td>\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-6354467409705666\"\n     crossorigin=\"anonymous\"><\/script>\n<!-- py-article-doubleA -->\n<ins class=\"adsbygoogle\"\n     style=\"display:inline-block;width:336px;height:300px\"\n     data-ad-client=\"ca-pub-6354467409705666\"\n     data-ad-slot=\"1820454727\"><\/ins>\n<script>\n     (adsbygoogle = window.adsbygoogle || []).push({});\n<\/script>\n<\/td>\n\n<td>\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-6354467409705666\"\n     crossorigin=\"anonymous\"><\/script>\n<!-- py-article-doubleB -->\n<ins class=\"adsbygoogle\"\n     style=\"display:inline-block;width:336px;height:300px\"\n     data-ad-client=\"ca-pub-6354467409705666\"\n     data-ad-slot=\"3395043238\"><\/ins>\n<script>\n     (adsbygoogle = window.adsbygoogle || []).push({});\n<\/script>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n\n\n<h2 class=\"wp-block-heading\">How to count elements in two-dimensional list.<\/h2>\n\n\n\n<p>I show <span class=\"st-mymarker-s\">how to count elements in two-dimensional list<\/span>.<\/p>\n\n\n\n<p>Use the &#8220;len() function&#8221; even for two-dimensional lists.<\/p>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>If you want to know the number of rows, specify a list as an argument.<\/p>\n\n\n\n<p>If you want to know the number of columns, specify a element of list as an argument.<\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>Here is an example code.<\/p>\n\n\n\n<pre class=\"wp-block-code line-numbers language-Python\"><code>list_2 = &#091;\n&#091;11, 12, 13, 14],\n&#091;21, 22, 23, 24],\n&#091;31, 32, 33, 34],\n]\n\nprint(len(list_2))\n# 3\nprint(len(list_2&#091;0]))\n# 4<\/code><\/pre>\n\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p style=\"color:#666;margin-bottom:5px;\">sponsored link<\/p>\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-6354467409705666\"\n     crossorigin=\"anonymous\"><\/script>\n<!-- py-article-display -->\n<ins class=\"adsbygoogle\"\n     style=\"display:block\"\n     data-ad-client=\"ca-pub-6354467409705666\"\n     data-ad-slot=\"6239864271\"\n     data-ad-format=\"auto\"\n     data-full-width-responsive=\"true\"><\/ins>\n<script>\n     (adsbygoogle = window.adsbygoogle || []).push({});\n<\/script>\n\n\n\n<h2 class=\"wp-block-heading\">How to count the number of specific elements in list<\/h2>\n\n\n\n<p>I show <span class=\"st-mymarker-s\">how to count the number of specific elements in list<\/span>.<\/p>\n\n\n\n<p>The &#8220;count&#8221; method can be used to count the number of specific elements contained in a list.<\/p>\n\n\n<div class=\"st-mybox  has-title st-mybox-class\" style=\"background:#E3F2FD;border-color:#2196F3;border-width:3px;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;background: linear-gradient(0deg,#E3F2FD 0%,#E3F2FD 55%,rgba(0,0,0,0) 55%,rgba(0,0,0,0) 100%);\">How to write<\/p><div class=\"st-in-mybox\">\n<p>List.count( Value )<\/p>\n<\/div><\/div>\n\n\n\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>Here is an example code.<\/p>\n\n\n\n<pre class=\"wp-block-code line-numbers language-Python\"><code>list_1 = &#091;\"Apple\", \"Banana\", \"Orange\", \"Bana\", \"Banana\"]\n\nprint(list_1.count(\"Apple\"))\n# 1\nprint(list_1.count(\"Ban\"))\n# 0<\/code><\/pre>\n\n\n\n<div style=\"height:50px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>By the way, the following article describes how to search for elements in the list.<\/p>\n\n\n\n<p class=\"is-style-st-paragraph-memo\"><a href=\"https:\/\/python-academia.com\/en\/list-count\/\" target=\"_blank\" rel=\"noreferrer noopener\">How to Find Element in List [exact match, partial match]<\/a><\/p>\n\n\n\n<div style=\"height:100px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p style=\"color:#666;margin-bottom:5px;\">sponsored link<\/p>\n<script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-6354467409705666\"\n     crossorigin=\"anonymous\"><\/script>\n<ins class=\"adsbygoogle\"\n     style=\"display:block\"\n     data-matched-content-rows-num=\"4,2\"\n     data-matched-content-columns-num=\"1,4\"\n     data-matched-content-ui-type=\"image_stacked,image_stacked\"\n     data-ad-format=\"autorelaxed\"\n     data-ad-client=\"ca-pub-6354467409705666\"\n     data-ad-slot=\"2243394422\"><\/ins>\n<script>\n     (adsbygoogle = window.adsbygoogle || []).push({});\n<\/script>\n","protected":false},"excerpt":{"rendered":"<p>This article shows how to count list elements. How to count elements in list ( Get list size ). I sh &#8230; <\/p>\n","protected":false},"author":1,"featured_media":2459,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9,11],"tags":[16,19],"_links":{"self":[{"href":"https:\/\/python-academia.com\/en\/wp-json\/wp\/v2\/posts\/1506"}],"collection":[{"href":"https:\/\/python-academia.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/python-academia.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/python-academia.com\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/python-academia.com\/en\/wp-json\/wp\/v2\/comments?post=1506"}],"version-history":[{"count":39,"href":"https:\/\/python-academia.com\/en\/wp-json\/wp\/v2\/posts\/1506\/revisions"}],"predecessor-version":[{"id":2458,"href":"https:\/\/python-academia.com\/en\/wp-json\/wp\/v2\/posts\/1506\/revisions\/2458"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/python-academia.com\/en\/wp-json\/wp\/v2\/media\/2459"}],"wp:attachment":[{"href":"https:\/\/python-academia.com\/en\/wp-json\/wp\/v2\/media?parent=1506"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/python-academia.com\/en\/wp-json\/wp\/v2\/categories?post=1506"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/python-academia.com\/en\/wp-json\/wp\/v2\/tags?post=1506"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}