{"id":1946,"date":"2020-12-28T02:22:21","date_gmt":"2020-12-28T02:22:21","guid":{"rendered":"https:\/\/www.pythontutorial.net\/?page_id=1946"},"modified":"2020-12-28T03:22:26","modified_gmt":"2020-12-28T03:22:26","slug":"python-string-islower","status":"publish","type":"page","link":"https:\/\/www.pythontutorial.net\/python-string-methods\/python-string-islower\/","title":{"rendered":"Python String islower()"},"content":{"rendered":"\n<p><strong>Summary<\/strong>: in this tutorial, you&#8217;ll learn how to use the Python string <code>islower()<\/code> method to check if all cases characters are lowercase.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='introduction-to-the-python-string-islower-method'>Introduction to the Python String islower() method <a href=\"#introduction-to-the-python-string-islower-method\" class=\"anchor\" id=\"introduction-to-the-python-string-islower-method\" title=\"Anchor for Introduction to the Python String islower() method\">#<\/a><\/h2>\n\n\n\n<p>The following shows the syntax of the <a href=\"https:\/\/www.pythontutorial.net\/python-basics\/python-string\/\">string<\/a> <code>islower()<\/code> method:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-1\" data-shcb-language-name=\"CSS\" data-shcb-language-slug=\"css\"><span><code class=\"hljs language-css\"><span class=\"hljs-selector-tag\">str<\/span><span class=\"hljs-selector-class\">.islower<\/span>()<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-1\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">CSS<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">css<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>The string <code>islower()<\/code> method returns <code>True<\/code> if all cased characters are lowercase. Otherwise, it returns <code>False<\/code>.<\/p>\n\n\n\n<p>If the string doesn&#8217;t contain any cased characters, the <code>islower()<\/code> method also returns <code>False<\/code>.<\/p>\n\n\n\n<p>In Python, cased characters are the ones with general category property being one of:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>Lu (letter, uppercase)<\/li><li>Ll (letter, lowercase)<\/li><li>Lt (letter, titlecase)<\/li><\/ul>\n\n\n\n<p class=\"note\">Note that to return a copy of the string with all characters converted to lowercase, you use the string <code><a href=\"https:\/\/www.pythontutorial.net\/python-string-methods\/python-string-lower\/\">lower()<\/a><\/code> method.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id='python-string-islower-method-examples'>Python String islower() method examples <a href=\"#python-string-islower-method-examples\" class=\"anchor\" id=\"python-string-islower-method-examples\" title=\"Anchor for Python String islower() method examples\">#<\/a><\/h2>\n\n\n\n<p>Let&#8217;s take some examples of using the string <code>islower()<\/code> method.<\/p>\n\n\n\n<p>The following example uses the <code>islower()<\/code> to check if all characters of an email are lowercase:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-2\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\">email = <span class=\"hljs-string\">'hello@example.com'<\/span>\nis_lowercase = email.islower()\n<span class=\"hljs-keyword\">print<\/span>(is_lowercase)<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-2\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PHP<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">php<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-3\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\"><span class=\"hljs-keyword\">True<\/span><\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-3\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PHP<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">php<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>However, the following example returns False because the first character of the string is uppercase:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-4\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\">email = <span class=\"hljs-string\">'Admin@example.com'<\/span>\nis_lowercase = email.islower()\n<span class=\"hljs-keyword\">print<\/span>(is_lowercase)<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-4\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PHP<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">php<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-5\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\"><span class=\"hljs-keyword\">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\">PHP<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">php<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>The following example return <code>False<\/code> because the string has no cased characters:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-6\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\">number_str = <span class=\"hljs-string\">'123'<\/span>\nis_lowercase = number_str.islower()\n<span class=\"hljs-keyword\">print<\/span>(is_lowercase)<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-6\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PHP<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">php<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\n\n\n<p>Output:<\/p>\n\n\n<pre class=\"wp-block-code\" aria-describedby=\"shcb-language-7\" data-shcb-language-name=\"PHP\" data-shcb-language-slug=\"php\"><span><code class=\"hljs language-php\"><span class=\"hljs-keyword\">False<\/span><\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-7\"><span class=\"shcb-language__label\">Code language:<\/span> <span class=\"shcb-language__name\">PHP<\/span> <span class=\"shcb-language__paren\">(<\/span><span class=\"shcb-language__slug\">php<\/span><span class=\"shcb-language__paren\">)<\/span><\/small><\/pre>\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 string <code>islower()<\/code> method to determine if all cased characters of a string are lowercase.<\/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=\"1946\"\n\t\t\t\tdata-post-url=\"https:\/\/www.pythontutorial.net\/python-string-methods\/python-string-islower\/\"\n\t\t\t\tdata-post-title=\"Python String islower()\"\n\t\t\t\tdata-response=\"1\"\n\t\t\t\tclass=\"wth-btn-rounded 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lowercase.<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":1925,"menu_order":11,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-1946","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/www.pythontutorial.net\/wp-json\/wp\/v2\/pages\/1946","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=1946"}],"version-history":[{"count":0,"href":"https:\/\/www.pythontutorial.net\/wp-json\/wp\/v2\/pages\/1946\/revisions"}],"up":[{"embeddable":true,"href":"https:\/\/www.pythontutorial.net\/wp-json\/wp\/v2\/pages\/1925"}],"wp:attachment":[{"href":"https:\/\/www.pythontutorial.net\/wp-json\/wp\/v2\/media?parent=1946"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}