{"id":3986,"date":"2017-10-23T02:13:40","date_gmt":"2017-10-23T02:13:40","guid":{"rendered":"http:\/\/www.jquery-az.com\/?p=3986"},"modified":"2023-11-07T12:13:08","modified_gmt":"2023-11-07T12:13:08","slug":"4-demos-python-if-not-and-not-in-operator","status":"publish","type":"post","link":"https:\/\/www.jquery-az.com\/4-demos-python-if-not-and-not-in-operator\/","title":{"rendered":"&#8220;not&#8221; Operator in Python"},"content":{"rendered":"<p><img decoding=\"async\" loading=\"lazy\" class=\"aligncenter size-full wp-image-11193\" src=\"https:\/\/www.jquery-az.com\/wp-content\/uploads\/2017\/10\/Python-not-operator.jpg\" alt=\"Simplify your Python code with the 'not' operator. Explore how to reverse truth values, check for negation, and apply De Morgan's Laws.\" width=\"700\" height=\"600\" srcset=\"https:\/\/www.jquery-az.com\/wp-content\/uploads\/2017\/10\/Python-not-operator.jpg 700w, https:\/\/www.jquery-az.com\/wp-content\/uploads\/2017\/10\/Python-not-operator-300x257.jpg 300w\" sizes=\"(max-width: 700px) 100vw, 700px\" \/><\/p>\n<div class=\"bullet-1\">\n<p><strong>What is the &#8216;not&#8217; operator in Python?<\/strong><\/p>\n<ul>\n<li>The \u2018not\u2019 is a Logical operator in Python that returns <em><strong>True<\/strong><\/em> if the expression is False.<\/li>\n<li>The \u2018not\u2019 operator is used in the if statements.<\/li>\n<\/ul>\n<p>For example:<\/p>\n<div class=\"codesdiv1\">if not x<\/div>\n<ul>\n<li>If x is True, then not will be evaluated as False, otherwise, True.<\/li>\n<\/ul>\n<\/div>\n<p>I will show you a few examples to make things clearer regarding how to use the not operator in the coming section.<\/p>\n<h3><strong>Python not operator example with if statement<\/strong><\/h3>\n<p>In the following example, a variable x is assigned a value 10. The \u2018not\u2019 is used in <a href=\"\/python-if-else-and-elif-statements-explained-with-8-examples\/\">the if statement<\/a> as follows:<\/p>\n<div class=\"codesdiv1\">if not x &gt; 10:<\/div>\n<p>See the code and result.<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">#A demo of Python 'not' operator\r\n\r\nx = 10\r\n\r\nif not x &gt; 10:\r\n\r\n\u00a0\u00a0\u00a0 print(\"not retured True\")\r\n\r\nelse:\r\n\r\n\u00a0\u00a0\u00a0 print(\"not retured False\")<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<div class=\"codeoutput\">not retured True<\/div>\n<p>As <em>x&gt;10<\/em> is False, so &#8216;<em>not&#8217;<\/em> operator is evaluated as True, thus the if statement is True, and the code inside the if statement is executed.<\/p>\n<p>See the next example that will make things even clearer.<\/p>\n<div class=\"note-tips1\"><strong>Other logical operators:<\/strong> <a href=\"\/python-operator-4-examples-statement\/\">The and operator<\/a> | <a href=\"\/5-examples-python-operator-statement\/\">OR operator<\/a><\/div>\n<h3><strong>How not operator works?<\/strong><\/h3>\n<p>In this demo, the x is used as follows with &#8216;not&#8217; operator.<\/p>\n<div class=\"codesdiv1\">if not x:<\/div>\n<p>Python program:<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">#A demo of Python 'not' operator\r\n\r\nx = 10\r\n\r\nif not x:\r\n\r\n\u00a0\u00a0\u00a0 print(\"Evaluated True\")\r\n\r\nelse:\r\n\r\n\u00a0\u00a0\u00a0 print(\"Evaluated False\")<\/pre>\n<p><strong>Result:<\/strong><\/p>\n<div class=\"codeoutput\">Evaluated False<\/div>\n<p>The expression <em><strong>not x<\/strong><\/em> means if x is True or False.<\/p>\n<div class=\"note-tips1\">In Python, if a variable is a numeric\u00a0<em>zero or empty, or a None<\/em> object then it is considered as False, otherwise True.<\/div>\n<p>&nbsp;<\/p>\n<p>In that case, as x = 10, it is <strong>True<\/strong>. As x is True, so &#8216;not&#8217; operator is evaluated as False, and the <strong>else<\/strong> part is executed.<\/p>\n<p>See the same example below where the value of x = 0.<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">x = 10\r\n\r\nif not x:\r\n\r\n\u00a0\u00a0\u00a0 print(\"Evaluated True\")\r\n\r\nelse:\r\n\r\n\u00a0\u00a0\u00a0 print(\"Evaluated False\")<\/pre>\n<p>Result:<\/p>\n<div class=\"codeoutput\">Evaluated False<\/div>\n<h3><strong>A Python not with \u2018in\u2019 example<\/strong><\/h3>\n<p>In this example, I will show you how to use the \u2018not\u2019 operator with \u2018in\u2019.<\/p>\n<p>For that, a numeric <a href=\"\/python-list-12-examples-to-learn-with-built-in-methods\/\">list<\/a> of six items is created. This is followed by using a for loop to iterate through the list elements and display their values.<\/p>\n<p>After that, an if statement is used to omit certain numbers to be displayed. There, the not operator is used with the \u2018in\u2019 as follows:<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">#A demo of Python 'not' with 'in' operator\r\n\r\na_List = [5, 10, 15, 20, 25, 30]\r\n\r\nfor a in a_List:\r\n\r\n\u00a0\u00a0\u00a0 if not a in (10,25):\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 print (\"List Item: \" ,a)<\/pre>\n<p>Output:<\/p>\n<div class=\"codeoutput\">List Item: 5<br \/>\nList Item: 15<br \/>\nList Item: 20<br \/>\nList Item: 30<\/div>\n<p>You see, the items that evaluated False as using \u2018not\u2019 did not display.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The \u2018not\u2019 is a Logical operator in Python that will return True if the expression is False. The \u2018not\u2019 operator is used in the if statements.<\/p>\n","protected":false},"author":1,"featured_media":11193,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[17],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v21.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>4 Demos of Python if not and not in: The not operator<\/title>\n<meta name=\"description\" content=\"The \u2018not\u2019 is a Logical operator in Python that will return True if the expression is False. 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