{"id":4746,"date":"2022-09-13T04:49:03","date_gmt":"2022-09-13T04:49:03","guid":{"rendered":"https:\/\/www.pythontutorial.net\/?page_id=4746"},"modified":"2022-09-13T04:50:27","modified_gmt":"2022-09-13T04:50:27","slug":"python-all","status":"publish","type":"page","link":"https:\/\/www.pythontutorial.net\/python-built-in-functions\/python-all\/","title":{"rendered":"Python all"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you will learn how to use the Python <code>all()<\/code> function to check if all elements of an iterable are true.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='introduction-to-the-python-all-function'>Introduction to the Python all() function <a href=\"#introduction-to-the-python-all-function\" class=\"anchor\" id=\"introduction-to-the-python-all-function\" title=\"Anchor for Introduction to the Python all() function\">#<\/a><\/h2>\n\n\n\n<p>The Python <code>all()<\/code> function accepts an <a href=\"https:\/\/www.pythontutorial.net\/python-basics\/python-iterables\/\">iterable<\/a> and returns <code>True<\/code> if all elements of the iterable are <code>True<\/code>. It also returns <code>True<\/code> if the iterable is empty.<\/p>\n\n\n\n<p>Here&#8217;s the syntax of the <code>all()<\/code> function:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-1\" data-shcb-language-name=\"Python\" data-shcb-language-slug=\"python\"><span><code class=\"hljs language-python\">all(iterable)<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-1\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">Python<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">python<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>The following example illustrates <code>all()<\/code> functions:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-2\" data-shcb-language-name=\"Python\" data-shcb-language-slug=\"python\"><span><code class=\"hljs language-python\">mask = &#91;<span class=\"hljs-literal\">True<\/span>, <span class=\"hljs-literal\">True<\/span>, <span class=\"hljs-literal\">False<\/span>]\nresult = all(mask)\nprint(result)  <span class=\"hljs-comment\"># ? False<\/span>\n\nmask = &#91;<span class=\"hljs-literal\">True<\/span>, <span class=\"hljs-literal\">True<\/span>, <span class=\"hljs-literal\">True<\/span>]\nresult = all(mask)\nprint(result)  <span class=\"hljs-comment\"># ? True<\/span>\n\nresult = all(&#91;])\nprint(result)  <span class=\"hljs-comment\"># ? True<\/span><\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-2\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">Python<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">python<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>How it works.<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>First, <code>[True, True, False]<\/code> has an element with the value <code>False<\/code>, the <code>all()<\/code> function returns <code>False<\/code>.<\/li><li>Second, <code>[True, True, True]<\/code> has all elements with value <code>True<\/code>, the <code>all()<\/code> function returns <code>True<\/code>.<\/li><li>Third, <code>[]<\/code> is an empty iterable, therefore, the <code>all()<\/code> function also returns <code>True<\/code>.<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\" id='practical-examples-of-the-all-function'>Practical examples of the all() function <a href=\"#practical-examples-of-the-all-function\" class=\"anchor\" id=\"practical-examples-of-the-all-function\" title=\"Anchor for Practical examples of the all() function\">#<\/a><\/h2>\n\n\n\n<p>Let&#8217;s take some practical examples of using the <code>all()<\/code> function.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id='1-using-python-all-function-to-make-a-complex-condition-more-simple'>1) Using Python all() function to make a complex condition more simple <a href=\"#1-using-python-all-function-to-make-a-complex-condition-more-simple\" class=\"anchor\" id=\"1-using-python-all-function-to-make-a-complex-condition-more-simple\" title=\"Anchor for 1) Using Python all() function to make a complex condition more simple\">#<\/a><\/h3>\n\n\n\n<p>The following example checks if the <a href=\"https:\/\/www.pythontutorial.net\/python-built-in-functions\/python-len\/\">length<\/a> of <code>v<\/code> is greater than zero and less than 25 and if it contains only alphanumeric characters:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-3\" data-shcb-language-name=\"Python\" data-shcb-language-slug=\"python\"><span><code class=\"hljs language-python\">v = <span class=\"hljs-string\">'Python'<\/span>\n<span class=\"hljs-keyword\">if<\/span> len(v) &gt; <span class=\"hljs-number\">0<\/span> <span class=\"hljs-keyword\">and<\/span> len(v) &lt; <span class=\"hljs-number\">25<\/span> <span class=\"hljs-keyword\">and<\/span> v.isalnum():\n    print(v)<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-3\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">Python<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">python<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>The condition is quite complex. To make it shorter, you can replace all the <code>and<\/code> operators with the <code>all()<\/code> function like this:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-4\" data-shcb-language-name=\"Python\" data-shcb-language-slug=\"python\"><span><code class=\"hljs language-python\">v = <span class=\"hljs-string\">'Python'<\/span>\nvalid = all(&#91;len(v) &gt; <span class=\"hljs-number\">0<\/span>, len(v) &lt; <span class=\"hljs-number\">25<\/span>, v.isalnum()])\n<span class=\"hljs-keyword\">if<\/span> valid:\n    print(v)<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-4\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">Python<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">python<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>In this example, The <code>valid<\/code> evaluates to <code>True<\/code> if all the conditions inside the tuple passed to the <code>all()<\/code> the function returns <code>True<\/code>.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id='2-using-python-all-function-to-validate-iterables-of-numbers'>2) Using Python all() function to validate iterables of numbers <a href=\"#2-using-python-all-function-to-validate-iterables-of-numbers\" class=\"anchor\" id=\"2-using-python-all-function-to-validate-iterables-of-numbers\" title=\"Anchor for 2) Using Python all() function to validate iterables of numbers\">#<\/a><\/h3>\n\n\n\n<p>The following example uses the <code>all()<\/code> function to check if all numbers of an iterable are greater than or equal to four:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-5\" data-shcb-language-name=\"Python\" data-shcb-language-slug=\"python\"><span><code class=\"hljs language-python\">ratings = &#91;<span class=\"hljs-number\">3<\/span>, <span class=\"hljs-number\">5<\/span>, <span class=\"hljs-number\">4<\/span>, <span class=\"hljs-number\">2<\/span>, <span class=\"hljs-number\">4<\/span>, <span class=\"hljs-number\">5<\/span>]\nhas_good_rating = all(&#91;rating &gt;= <span class=\"hljs-number\">4<\/span> <span class=\"hljs-keyword\">for<\/span> rating <span class=\"hljs-keyword\">in<\/span> ratings])\nprint(has_good_rating)  <span class=\"hljs-comment\"># false<\/span><\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-5\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">Python<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">python<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>How it works.<\/p>\n\n\n\n<p>First, use a list comprehension to convert the list of ratings to a list of <code>True<\/code> and <code>False<\/code>. The following <\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-6\" data-shcb-language-name=\"Python\" data-shcb-language-slug=\"python\"><span><code class=\"hljs language-python\">&#91;rating &gt;= <span class=\"hljs-number\">4<\/span> <span class=\"hljs-keyword\">for<\/span> rating <span class=\"hljs-keyword\">in<\/span> ratings]<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-6\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">Python<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">python<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>returns a list of boolean values:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-7\" data-shcb-language-name=\"Python\" data-shcb-language-slug=\"python\"><span><code class=\"hljs language-python\">&#91;<span class=\"hljs-literal\">False<\/span>, <span class=\"hljs-literal\">True<\/span>, <span class=\"hljs-literal\">True<\/span>, <span class=\"hljs-literal\">False<\/span>, <span class=\"hljs-literal\">True<\/span>, <span class=\"hljs-literal\">True<\/span>]<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-7\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">Python<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">python<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Second, pass the result of the list comprehension to <code><code>all()<\/code><\/code> function. So <code><code>all()<\/code><\/code> function returns False because the list contains some False elements.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='summary'>Summary <a href=\"#summary\" class=\"anchor\" id=\"summary\" title=\"Anchor for Summary\">#<\/a><\/h2>\n\n\n\n<ul class=\"wp-block-list\"><li>Use the Python <code>all()<\/code> function to check if all elements of an iterable are true.<\/li><\/ul>\n<div class=\"helpful-block-content\" data-title=\"\">\n\t<header>\n\t\t<div class=\"wth-question\">Was this tutorial helpful ?<\/div>\n\t\t<div class=\"wth-thumbs\">\n\t\t\t<button\n\t\t\t\tdata-post=\"4746\"\n\t\t\t\tdata-post-url=\"https:\/\/www.pythontutorial.net\/python-built-in-functions\/python-all\/\"\n\t\t\t\tdata-post-title=\"Python all\"\n\t\t\t\tdata-response=\"1\"\n\t\t\t\tclass=\"wth-btn-rounded wth-yes-btn\"\n\t\t\t>\n\t\t\t\t<svg\n\t\t\t\t\txmlns=\"http:\/\/www.w3.org\/2000\/svg\"\n\t\t\t\t\tviewBox=\"0 0 24 24\"\n\t\t\t\t\tfill=\"none\"\n\t\t\t\t\tstroke=\"currentColor\"\n\t\t\t\t\tstroke-width=\"2\"\n\t\t\t\t\tstroke-linecap=\"round\"\n\t\t\t\t\tstroke-linejoin=\"round\"\n\t\t\t\t\tclass=\"feather feather-thumbs-up block w-full h-full\"\n\t\t\t\t>\n\t\t\t\t\t<path\n\t\t\t\t\t\td=\"M14 9V5a3 3 0 0 0-3-3l-4 9v11h11.28a2 2 0 0 0 2-1.7l1.38-9a2 2 0 0 0-2-2.3zM7 22H4a2 2 0 0 1-2-2v-7a2 2 0 0 1 2-2h3\"\n\t\t\t\t\t><\/path>\n\t\t\t\t<\/svg>\n\t\t\t\t<span class=\"sr-only\"> Yes <\/span>\n\t\t\t<\/button>\n\n\t\t\t<button\n\t\t\t\tdata-response=\"0\"\n\t\t\t\tdata-post=\"4746\"\n\t\t\t\tdata-post-url=\"https:\/\/www.pythontutorial.net\/python-built-in-functions\/python-all\/\"\n\t\t\t\tdata-post-title=\"Python all\"\n\t\t\t\tclass=\"wth-btn-rounded wth-no-btn\"\n\t\t\t>\n\t\t\t\t<svg\n\t\t\t\t\txmlns=\"http:\/\/www.w3.org\/2000\/svg\"\n\t\t\t\t\tviewBox=\"0 0 24 24\"\n\t\t\t\t\tfill=\"none\"\n\t\t\t\t\tstroke=\"currentColor\"\n\t\t\t\t\tstroke-width=\"2\"\n\t\t\t\t\tstroke-linecap=\"round\"\n\t\t\t\t\tstroke-linejoin=\"round\"\n\t\t\t\t>\n\t\t\t\t\t<path\n\t\t\t\t\t\td=\"M10 15v4a3 3 0 0 0 3 3l4-9V2H5.72a2 2 0 0 0-2 1.7l-1.38 9a2 2 0 0 0 2 2.3zm7-13h2.67A2.31 2.31 0 0 1 22 4v7a2.31 2.31 0 0 1-2.33 2H17\"\n\t\t\t\t\t><\/path>\n\t\t\t\t<\/svg>\n\t\t\t\t<span class=\"sr-only\"> No <\/span>\n\t\t\t<\/button>\n\t\t<\/div>\n\t<\/header>\n\n\t<div class=\"wth-form hidden\">\n\t\t<div class=\"wth-form-wrapper\">\n\t\t\t<div class=\"wth-title\"><\/div>\n\t\t\t<textarea class=\"wth-message\"><\/textarea>\n\t\t\t<input type=\"button\" name=\"wth-submit\" class=\"wth-btn wth-btn-submit\" id=\"wth-submit\" \/>\n\t\t\t<input type=\"button\" class=\"wth-btn wth-btn-cancel\" value=\"Cancel\" \/>\n\t\t<\/div>\n\t<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Summary: in this tutorial, you will learn how to use the Python all() function to check if all elements of an iterable are true. Introduction to the Python all() function # The Python all() function accepts an iterable and returns True if all elements of the iterable are True. It also returns True if the [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":1055,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-4746","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.pythontutorial.net\/wp-json\/wp\/v2\/pages\/4746","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.pythontutorial.net\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.pythontutorial.net\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.pythontutorial.net\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.pythontutorial.net\/wp-json\/wp\/v2\/comments?post=4746"}],"version-history":[{"count":0,"href":"https:\/\/www.pythontutorial.net\/wp-json\/wp\/v2\/pages\/4746\/revisions"}],"up":[{"embeddable":true,"href":"https:\/\/www.pythontutorial.net\/wp-json\/wp\/v2\/pages\/1055"}],"wp:attachment":[{"href":"https:\/\/www.pythontutorial.net\/wp-json\/wp\/v2\/media?parent=4746"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}