{"id":8811,"date":"2021-03-03T22:04:27","date_gmt":"2021-03-03T16:34:27","guid":{"rendered":"https:\/\/pynative.com\/?p=8811"},"modified":"2021-07-25T17:58:41","modified_gmt":"2021-07-25T12:28:41","slug":"python-control-flow-statements","status":"publish","type":"post","link":"https:\/\/pynative.com\/python-control-flow-statements\/","title":{"rendered":"Python Control Flow Statements and Loops"},"content":{"rendered":"\n<p>In Python programming, flow control is the order in which statements or blocks of code are executed at runtime based on a condition.<\/p>\n\n\n\n<div class=\"wp-block-columns sectionpy has-black-color has-text-color has-background is-layout-flex wp-container-core-columns-is-layout-1 wp-block-columns-is-layout-flex\" style=\"background-color:#edf9f8\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<p><strong>Also See<\/strong>:<\/p>\n\n\n\n<ul><li><a href=\"https:\/\/pynative.com\/python-if-else-and-for-loop-exercise-with-solutions\/\">Python If-else and Loops Exercise<\/a><\/li><li><a href=\"https:\/\/pynative.com\/python-if-else-and-for-loop-quiz\/\">Python if else and Loops Quiz<\/a><\/li><\/ul>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-yoast-seo-table-of-contents yoast-table-of-contents\"><h2>Table of contents<\/h2><ul><li><a href=\"#h-control-flow-statements\" data-level=\"2\">Control Flow Statements<\/a><ul><li><a href=\"#h-conditional-statements\" data-level=\"3\">Conditional statements<\/a><\/li><li><a href=\"#h-iterative-statements\" data-level=\"3\">Iterative statements<\/a><\/li><li><a href=\"#h-transfer-statements\" data-level=\"3\">Transfer statements<\/a><\/li><\/ul><\/li><li><a href=\"#h-if-statement-in-python\" data-level=\"2\">If statement in Python<\/a><ul><li><a href=\"#h-if-else-statement\" data-level=\"3\">If &#8211; else statement<\/a><\/li><li><a href=\"#h-chain-multiple-if-statement-in-python\" data-level=\"3\">Chain multiple if statement in Python<\/a><\/li><li><a href=\"#h-nested-if-else-statement\" data-level=\"3\">Nested if-else statement<\/a><\/li><li><a href=\"#h-single-statement-suites\" data-level=\"3\">Single statement suites<\/a><\/li><\/ul><\/li><li><a href=\"#h-for-loop-in-python\" data-level=\"2\">for loop in Python<\/a><\/li><li><a href=\"#h-while-loop-in-python\" data-level=\"2\">While loop in Python<\/a><\/li><li><a href=\"#h-break-statement-in-python\" data-level=\"2\">Break Statement in Python<\/a><\/li><li><a href=\"#h-continue-statement-in-python\" data-level=\"2\">Continue statement in python<\/a><\/li><li><a href=\"#h-pass-statement-in-python\" data-level=\"2\">Pass statement in Python<\/a><\/li><\/ul><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-control-flow-statements\">Control Flow Statements<\/h2>\n\n\n\n<p>The flow control statements are divided into <strong>three categories<\/strong><\/p>\n\n\n\n<ol><li>Conditional statements<\/li><li>Iterative statements.<\/li><li>Transfer statements<\/li><\/ol>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"413\" height=\"350\" src=\"https:\/\/pynative.com\/wp-content\/uploads\/2021\/03\/python-flow-control-statements.png\" alt=\"Python control flow statements\" class=\"wp-image-8806\" srcset=\"https:\/\/pynative.com\/wp-content\/uploads\/2021\/03\/python-flow-control-statements.png 413w, https:\/\/pynative.com\/wp-content\/uploads\/2021\/03\/python-flow-control-statements-300x254.png 300w\" sizes=\"(max-width: 413px) 100vw, 413px\" \/><figcaption>Python control flow statements<\/figcaption><\/figure><\/div>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-conditional-statements\">Conditional statements<\/h3>\n\n\n\n<p>In Python, condition statements act depending on whether a given condition is true or false. You can execute different blocks of codes depending on the outcome of a condition. Condition statements always evaluate to either True or False.<\/p>\n\n\n\n<p>There are three types of conditional statements.<\/p>\n\n\n\n<ol><li>if statement<\/li><li>if-else<\/li><li>if-elif-else<\/li><li>nested if-else<\/li><\/ol>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-iterative-statements\">Iterative statements<\/h3>\n\n\n\n<p>In Python, iterative statements allow us to execute a block of code repeatedly as long as the condition is True.&nbsp;We also call it a loop statements.<\/p>\n\n\n\n<p>Python provides us the following two loop statement to perform some actions repeatedly<\/p>\n\n\n\n<ol><li><a href=\"https:\/\/pynative.com\/python-for-loop\/\">for loop<\/a><\/li><li><a href=\"https:\/\/pynative.com\/python-while-loop\/\">while loop<\/a><\/li><\/ol>\n\n\n\n<p>Let&#8217;s learn each one of them with the examples<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-transfer-statements\">Transfer statements<\/h3>\n\n\n\n<p>In Python, <a href=\"https:\/\/pynative.com\/python-break-continue-pass\/\">transfer statements<\/a> are used to alter the program&#8217;s way of execution in a certain manner. For this purpose, we use three types of transfer statements.<\/p>\n\n\n\n<ol><li><a href=\"https:\/\/pynative.com\/python-break-continue-pass\/#h-break-statement-in-python\">break statement<\/a><\/li><li><a href=\"https:\/\/pynative.com\/python-break-continue-pass\/#h-continue-statement-in-python\">continue statement<\/a><\/li><li><code>pass<\/code> statements<\/li><\/ol>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-if-statement-in-python\">If statement in Python<\/h2>\n\n\n\n<p>In control statements, The <code>if<\/code> statement is the simplest form. It takes a condition and evaluates to either <code>True <\/code>or <code>False<\/code>.<\/p>\n\n\n\n<p>If the condition is <code>True<\/code>, then the True block of code will be executed, and if the condition is False, then the block of code is skipped, and The controller moves to the next line<\/p>\n\n\n\n<p><strong>Syntax of the <code>if<\/code> statement<\/strong><\/p>\n\n\n<pre id=\"syntax\" class=\"wp-block-code language-python\" aria-describedby=\"shcb-language-1\" data-shcb-language-name=\"Python\" data-shcb-language-slug=\"python\"><span><code class=\"hljs language-python\"><span class=\"hljs-keyword\">if<\/span> condition:\n     statement <span class=\"hljs-number\">1<\/span>\n     statement <span class=\"hljs-number\">2<\/span>\n     statement n<\/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<div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"266\" height=\"343\" src=\"https:\/\/pynative.com\/wp-content\/uploads\/2021\/03\/python-if-statements.png\" alt=\"Python if statements\" class=\"wp-image-8809\" srcset=\"https:\/\/pynative.com\/wp-content\/uploads\/2021\/03\/python-if-statements.png 266w, https:\/\/pynative.com\/wp-content\/uploads\/2021\/03\/python-if-statements-233x300.png 233w\" sizes=\"(max-width: 266px) 100vw, 266px\" \/><figcaption>Python if statements<\/figcaption><\/figure><\/div>\n\n\n\n<p>Let&#8217;s see the example of the if statement. In this example, we will calculate the square of a number if it greater than 5<\/p>\n\n\n\n<p><strong>Example<\/strong><\/p>\n\n\n<div class=\"hljstoolbar\"><pre id=\"code1\"  class=\"wp-block-code language-python\" aria-describedby=\"shcb-language-2\" data-shcb-language-name=\"Python\" data-shcb-language-slug=\"python\"><span><code class=\"hljs language-python\">number = <span class=\"hljs-number\">6<\/span>\n<span class=\"hljs-keyword\">if<\/span> number &gt; <span class=\"hljs-number\">5<\/span>:\n    <span class=\"hljs-comment\"># Calculate square<\/span>\n    print(number * number)\nprint(<span class=\"hljs-string\">'Next lines of code'<\/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><button class=\"hljs-copy-button\" onclick=\"copy_code('code1', this);\"><i class=\"far fa-copy1\" aria-hidden=\"true\"><\/i><\/button><button class=\"hljs-run-button\" onclick=\"run_code('code1');\"><i class=\"far fa-play-circle\" aria-hidden=\"true\"><\/i> Run<\/button><\/div>\n\n\n<p><strong>Output<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">36\nNext lines of code<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-if-else-statement\">If &#8211; else statement<\/h3>\n\n\n\n<p>The <code>if-else<\/code> statement checks the condition and executes the <code>if<\/code> block of code when the condition is True, and if the condition is False, it will execute the <code>else<\/code> block of code.<\/p>\n\n\n\n<p><strong>Syntax of the <code>if-else<\/code> statement<\/strong><\/p>\n\n\n<pre id=\"syntax\" class=\"wp-block-code language-python\" aria-describedby=\"shcb-language-3\" data-shcb-language-name=\"Python\" data-shcb-language-slug=\"python\"><span><code class=\"hljs language-python\"><span class=\"hljs-keyword\">if<\/span> condition:\n    statement <span class=\"hljs-number\">1<\/span>\n<span class=\"hljs-keyword\">else<\/span>:\n    statement <span class=\"hljs-number\">2<\/span><\/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>If the condition is <code>True<\/code>, then statement 1 will be executed If the condition is <code>False<\/code>, statement 2 will be executed. See the following flowchart for more detail.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"291\" height=\"332\" src=\"https:\/\/pynative.com\/wp-content\/uploads\/2021\/03\/python-if-else-statement.png\" alt=\"Python if else statements\" class=\"wp-image-8808\" srcset=\"https:\/\/pynative.com\/wp-content\/uploads\/2021\/03\/python-if-else-statement.png 291w, https:\/\/pynative.com\/wp-content\/uploads\/2021\/03\/python-if-else-statement-263x300.png 263w\" sizes=\"(max-width: 291px) 100vw, 291px\" \/><figcaption>Python if-else statements<\/figcaption><\/figure><\/div>\n\n\n\n<p><strong>Example<\/strong><\/p>\n\n\n<div class=\"hljstoolbar\"><pre id=\"code2\"  class=\"wp-block-code language-python\" aria-describedby=\"shcb-language-4\" data-shcb-language-name=\"Python\" data-shcb-language-slug=\"python\"><span><code class=\"hljs language-python\">password = input(<span class=\"hljs-string\">'Enter password '<\/span>)\r\n\r\n<span class=\"hljs-keyword\">if<\/span> password == <span class=\"hljs-string\">\"PYnative@#29\"<\/span>:\r\n    print(<span class=\"hljs-string\">\"Correct password\"<\/span>)\r\n<span class=\"hljs-keyword\">else<\/span>:\r\n    print(<span class=\"hljs-string\">\"Incorrect Password\"<\/span>)\r<\/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><button class=\"hljs-copy-button\" onclick=\"copy_code('code2', this);\"><i class=\"far fa-copy1\" aria-hidden=\"true\"><\/i><\/button><button class=\"hljs-run-button\" onclick=\"run_code('code2');\"><i class=\"far fa-play-circle\" aria-hidden=\"true\"><\/i> Run<\/button><\/div>\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-2 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<p><strong>Output 1<\/strong>:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">Enter password PYnative@#29\r\nCorrect password<\/pre>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<p><strong>Output 2<\/strong>:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">Enter password PYnative\r\nIncorrect Password<\/pre>\n<\/div>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-chain-multiple-if-statement-in-python\">Chain multiple if statement in Python<\/h3>\n\n\n\n<p>In Python, the <code>if-elif-else<\/code> condition statement has an <code>elif<\/code> blocks to chain multiple conditions one after another. This is useful when you need to check multiple conditions.<\/p>\n\n\n\n<p>With the help of <code>if-elif-else<\/code> we can make a tricky decision. The <code>elif<\/code> statement checks multiple conditions one by one and if the condition fulfills, then executes that code.<\/p>\n\n\n\n<p>Syntax of the <code>if-elif-else<\/code> statement:<\/p>\n\n\n<pre id=\"syntax\" class=\"wp-block-code language-python\" aria-describedby=\"shcb-language-5\" data-shcb-language-name=\"Python\" data-shcb-language-slug=\"python\"><span><code class=\"hljs language-python\"><span class=\"hljs-keyword\">if<\/span> condition<span class=\"hljs-number\">-1<\/span>:  \n     statement <span class=\"hljs-number\">1<\/span> \n<span class=\"hljs-keyword\">elif<\/span> condition<span class=\"hljs-number\">-2<\/span>:\n     stetement <span class=\"hljs-number\">2<\/span> \n<span class=\"hljs-keyword\">elif<\/span> condition<span class=\"hljs-number\">-3<\/span>:\n     stetement <span class=\"hljs-number\">3<\/span> \n     ...         \n<span class=\"hljs-keyword\">else<\/span>:            \n     statement   <\/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><strong>Example<\/strong><\/p>\n\n\n<div class=\"hljstoolbar\"><pre id=\"code3\"  class=\"wp-block-code language-python\" aria-describedby=\"shcb-language-6\" data-shcb-language-name=\"Python\" data-shcb-language-slug=\"python\"><span><code class=\"hljs language-python\"><span class=\"hljs-function\"><span class=\"hljs-keyword\">def<\/span> <span class=\"hljs-title\">user_check<\/span><span class=\"hljs-params\">(choice)<\/span>:<\/span>\n    <span class=\"hljs-keyword\">if<\/span> choice == <span class=\"hljs-number\">1<\/span>:\n        print(<span class=\"hljs-string\">\"Admin\"<\/span>)\n    <span class=\"hljs-keyword\">elif<\/span> choice == <span class=\"hljs-number\">2<\/span>:\n        print(<span class=\"hljs-string\">\"Editor\"<\/span>)\n    <span class=\"hljs-keyword\">elif<\/span> choice == <span class=\"hljs-number\">3<\/span>:\n        print(<span class=\"hljs-string\">\"Guest\"<\/span>)\n    <span class=\"hljs-keyword\">else<\/span>:\n        print(<span class=\"hljs-string\">\"Wrong entry\"<\/span>)\n\nuser_check(<span class=\"hljs-number\">1<\/span>)\nuser_check(<span class=\"hljs-number\">2<\/span>)\nuser_check(<span class=\"hljs-number\">3<\/span>)\nuser_check(<span class=\"hljs-number\">4<\/span>)<\/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><button class=\"hljs-copy-button\" onclick=\"copy_code('code3', this);\"><i class=\"far fa-copy1\" aria-hidden=\"true\"><\/i><\/button><button class=\"hljs-run-button\" onclick=\"run_code('code3');\"><i class=\"far fa-play-circle\" aria-hidden=\"true\"><\/i> Run<\/button><\/div>\n\n\n<p><strong>Output<\/strong>:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">Admin\r\nEditor\r\nGuest\r\nWrong entry<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-nested-if-else-statement\">Nested if-else statement<\/h3>\n\n\n\n<p>In Python, the nested <code>if-else<\/code> statement is an if statement inside another <code>if-else<\/code> statement. It is allowed in Python to put any number of <code>if<\/code> statements in another <code>if<\/code> statement.<\/p>\n\n\n\n<p>Indentation is the only way to differentiate the level of nesting. The nested <code>if-else<\/code> is useful when we want to make a series of decisions.<\/p>\n\n\n\n<p><strong>Syntax of the nested-<code>if-else<\/code>:<\/strong><\/p>\n\n\n<pre id=\"syntax\" class=\"wp-block-code language-python\" aria-describedby=\"shcb-language-7\" data-shcb-language-name=\"Python\" data-shcb-language-slug=\"python\"><span><code class=\"hljs language-python\"><span class=\"hljs-keyword\">if<\/span> conditon_outer:\n    <span class=\"hljs-keyword\">if<\/span> condition_inner:\n        statement of inner <span class=\"hljs-keyword\">if<\/span>\n    <span class=\"hljs-keyword\">else<\/span>:\n        statement of inner <span class=\"hljs-keyword\">else<\/span>:\n    statement ot outer <span class=\"hljs-keyword\">if<\/span>\n<span class=\"hljs-keyword\">else<\/span>:\n    Outer <span class=\"hljs-keyword\">else<\/span> \nstatement outside <span class=\"hljs-keyword\">if<\/span> block<\/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><strong>Example<\/strong>: Find a greater number between two numbers<\/p>\n\n\n<div class=\"hljstoolbar\"><pre id=\"code4\"  class=\"wp-block-code language-python\" aria-describedby=\"shcb-language-8\" data-shcb-language-name=\"Python\" data-shcb-language-slug=\"python\"><span><code class=\"hljs language-python\">num1 = int(input(<span class=\"hljs-string\">'Enter first number '<\/span>))\r\nnum2 = int(input(<span class=\"hljs-string\">'Enter second number '<\/span>))\r\n\r\n<span class=\"hljs-keyword\">if<\/span> num1 &gt;= num2:\r\n    <span class=\"hljs-keyword\">if<\/span> num1 == num2:\r\n        print(num1, <span class=\"hljs-string\">'and'<\/span>, num2, <span class=\"hljs-string\">'are equal'<\/span>)\r\n    <span class=\"hljs-keyword\">else<\/span>:\r\n        print(num1, <span class=\"hljs-string\">'is greater than'<\/span>, num2)\r\n<span class=\"hljs-keyword\">else<\/span>:\r\n    print(num1, <span class=\"hljs-string\">'is smaller than'<\/span>, num2)\r<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-8\"><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><button class=\"hljs-copy-button\" onclick=\"copy_code('code4', this);\"><i class=\"far fa-copy1\" aria-hidden=\"true\"><\/i><\/button><button class=\"hljs-run-button\" onclick=\"run_code('code4');\"><i class=\"far fa-play-circle\" aria-hidden=\"true\"><\/i> Run<\/button><\/div>\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-3 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<p><strong>Output 1<\/strong>:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">Enter first number 56\r\nEnter second number 15\r\n56 is greater than 15<\/pre>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<p><strong>Output 2<\/strong>:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">Enter first number 29\r\nEnter second number 78\r\n29 is smaller than 78<\/pre>\n<\/div>\n<\/div>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-single-statement-suites\">Single statement suites<\/h3>\n\n\n\n<p>Whenever we write a block of code with multiple if statements, indentation plays an important role. But sometimes, there is a situation where the block contains only a single line statement.<\/p>\n\n\n\n<p>Instead of writing a block after the colon, we can write a statement immediately after the colon.<\/p>\n\n\n\n<p><strong>Example<\/strong><\/p>\n\n\n<pre id=\"syntax\" class=\"wp-block-code language-python\" aria-describedby=\"shcb-language-9\" data-shcb-language-name=\"Python\" data-shcb-language-slug=\"python\"><span><code class=\"hljs language-python\">number = <span class=\"hljs-number\">56<\/span>\n<span class=\"hljs-keyword\">if<\/span> number &gt; <span class=\"hljs-number\">0<\/span>: print(<span class=\"hljs-string\">\"positive\"<\/span>) \n<span class=\"hljs-keyword\">else<\/span>: print(<span class=\"hljs-string\">\"negative\"<\/span>)<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-9\"><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>Similar to the <code>if<\/code> statement, while loop also consists of a single statement, we can place that statement on the same line.<\/p>\n\n\n\n<p><strong>Example<\/strong><\/p>\n\n\n<div class=\"hljstoolbar\"><pre id=\"code5\"  class=\"wp-block-code language-python\" aria-describedby=\"shcb-language-10\" data-shcb-language-name=\"Python\" data-shcb-language-slug=\"python\"><span><code class=\"hljs language-python\">x = <span class=\"hljs-number\">1<\/span>\n<span class=\"hljs-keyword\">while<\/span> x &lt;= <span class=\"hljs-number\">5<\/span>: print(x,end=<span class=\"hljs-string\">\" \"<\/span>); x = x+<span class=\"hljs-number\">1<\/span><\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-10\"><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><button class=\"hljs-copy-button\" onclick=\"copy_code('code5', this);\"><i class=\"far fa-copy1\" aria-hidden=\"true\"><\/i><\/button><button class=\"hljs-run-button\" onclick=\"run_code('code5');\"><i class=\"far fa-play-circle\" aria-hidden=\"true\"><\/i> Run<\/button><\/div>\n\n\n<p><strong>Output<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">1 2 3 4 5<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-for-loop-in-python\">for loop in Python<\/h2>\n\n\n\n<p>Using for loop, we can iterate any sequence or iterable variable. The sequence can be string, <a href=\"https:\/\/pynative.com\/python-lists\/\">list<\/a>, <a href=\"https:\/\/pynative.com\/python-dictionaries\/\">dictionary<\/a>, <a href=\"https:\/\/pynative.com\/python-sets\/\">set<\/a>, or <a href=\"https:\/\/pynative.com\/python-tuples\/\">tuple<\/a>.<\/p>\n\n\n\n<p><strong>Read<\/strong> the Complete guide on <a href=\"https:\/\/pynative.com\/python-for-loop\/\"><strong>Python for loop<\/strong><\/a>.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"277\" height=\"335\" src=\"https:\/\/pynative.com\/wp-content\/uploads\/2021\/03\/python-for-loop.png\" alt=\"Python for loop\" class=\"wp-image-8807\" srcset=\"https:\/\/pynative.com\/wp-content\/uploads\/2021\/03\/python-for-loop.png 277w, https:\/\/pynative.com\/wp-content\/uploads\/2021\/03\/python-for-loop-248x300.png 248w\" sizes=\"(max-width: 277px) 100vw, 277px\" \/><figcaption>Python for loop<\/figcaption><\/figure><\/div>\n\n\n\n<p><strong>Syntax of <code>for<\/code> loop:<\/strong><\/p>\n\n\n<pre id=\"syntax\" class=\"wp-block-code language-python\" aria-describedby=\"shcb-language-11\" data-shcb-language-name=\"Python\" data-shcb-language-slug=\"python\"><span><code class=\"hljs language-python\"><span class=\"hljs-keyword\">for<\/span> element <span class=\"hljs-keyword\">in<\/span> sequence:\n     body of <span class=\"hljs-keyword\">for<\/span> loop   <\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-11\"><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><strong>Example to display first ten numbers using for loop<\/strong><\/p>\n\n\n<div class=\"hljstoolbar\"><pre id=\"code6\"  class=\"wp-block-code language-python\" aria-describedby=\"shcb-language-12\" data-shcb-language-name=\"Python\" data-shcb-language-slug=\"python\"><span><code class=\"hljs language-python\"><span class=\"hljs-keyword\">for<\/span> i <span class=\"hljs-keyword\">in<\/span> range(<span class=\"hljs-number\">1<\/span>, <span class=\"hljs-number\">11<\/span>):\n    print(i)<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-12\"><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><button class=\"hljs-copy-button\" onclick=\"copy_code('code6', this);\"><i class=\"far fa-copy1\" aria-hidden=\"true\"><\/i><\/button><button class=\"hljs-run-button\" onclick=\"run_code('code6');\"><i class=\"far fa-play-circle\" aria-hidden=\"true\"><\/i> Run<\/button><\/div>\n\n\n<p>Output<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">1\n2\n3\n4\n5\n6\n7\n8\n9\n10<\/pre>\n\n\n\n<p>Also, read <strong><a href=\"https:\/\/pynative.com\/python-nested-loops\/\">Nested loops in Python<\/a><\/strong>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-while-loop-in-python\">While loop in Python<\/h2>\n\n\n\n<p>In\u00a0Python, The while loop statement repeatedly executes a code block while a particular condition is true.<\/p>\n\n\n\n<p>In a while-loop, every time the condition is checked at the beginning of the loop, and if it is true, then the loop&#8217;s body gets executed. When the condition became False, the controller comes out of the block.<\/p>\n\n\n\n<p><strong>Read<\/strong> the Complete guide on <a href=\"https:\/\/pynative.com\/python-while-loop\/\"><strong>Python while loop<\/strong><\/a>.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"279\" height=\"331\" src=\"https:\/\/pynative.com\/wp-content\/uploads\/2021\/03\/python-while-loop.png\" alt=\"Python while loop\" class=\"wp-image-8810\" srcset=\"https:\/\/pynative.com\/wp-content\/uploads\/2021\/03\/python-while-loop.png 279w, https:\/\/pynative.com\/wp-content\/uploads\/2021\/03\/python-while-loop-253x300.png 253w\" sizes=\"(max-width: 279px) 100vw, 279px\" \/><figcaption>Python while loop<\/figcaption><\/figure><\/div>\n\n\n\n<p><strong>Syntax of while-loop<\/strong><\/p>\n\n\n<pre id=\"syntax\" class=\"wp-block-code language-python\" aria-describedby=\"shcb-language-13\" data-shcb-language-name=\"Python\" data-shcb-language-slug=\"python\"><span><code class=\"hljs language-python\"><span class=\"hljs-keyword\">while<\/span> condition :\n    body of <span class=\"hljs-keyword\">while<\/span> loop<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-13\"><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 id=\"h-example-to-calculate-the-sum-of-first-ten-numbers\"><strong>Example to calculate the sum of first ten numbers<\/strong><\/p>\n\n\n<div class=\"hljstoolbar\"><pre id=\"code7\"  class=\"wp-block-code language-python\" aria-describedby=\"shcb-language-14\" data-shcb-language-name=\"Python\" data-shcb-language-slug=\"python\"><span><code class=\"hljs language-python\">num = <span class=\"hljs-number\">10<\/span>\nsum = <span class=\"hljs-number\">0<\/span>\ni = <span class=\"hljs-number\">1<\/span>\n<span class=\"hljs-keyword\">while<\/span> i &lt;= num:\n    sum = sum + i\n    i = i + <span class=\"hljs-number\">1<\/span>\nprint(<span class=\"hljs-string\">\"Sum of first 10 number is:\"<\/span>, sum)<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-14\"><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><button class=\"hljs-copy-button\" onclick=\"copy_code('code7', this);\"><i class=\"far fa-copy1\" aria-hidden=\"true\"><\/i><\/button><button class=\"hljs-run-button\" onclick=\"run_code('code7');\"><i class=\"far fa-play-circle\" aria-hidden=\"true\"><\/i> Run<\/button><\/div>\n\n\n<p><strong>Output<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">Sum of first 10 number is: 55<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-break-statement-in-python\">Break Statement in Python<\/h2>\n\n\n\n<p><strong>Read<\/strong>: Complete guide on <a href=\"https:\/\/pynative.com\/python-break-continue-pass\/\">Python Break, Continue, and Pass<\/a>.<\/p>\n\n\n\n<p><strong>The <a href=\"https:\/\/pynative.com\/python-break-continue-pass\/#h-break-statement-in-python\">break statement<\/a><\/strong> is used inside the loop to exit out of the loop. It is useful when we want to terminate the loop as soon as the condition is fulfilled instead of doing the remaining iterations. It reduces execution time. Whenever the controller encountered a break statement, it comes out of that loop immediately<\/p>\n\n\n\n<p>Let&#8217;s see how to break a for a loop when we found a number greater than 5.<\/p>\n\n\n\n<p><strong>Example of using a break statement<\/strong><\/p>\n\n\n<div class=\"hljstoolbar\"><pre id=\"code8\"  class=\"wp-block-code language-python\" aria-describedby=\"shcb-language-15\" data-shcb-language-name=\"Python\" data-shcb-language-slug=\"python\"><span><code class=\"hljs language-python\"><span class=\"hljs-keyword\">for<\/span> num <span class=\"hljs-keyword\">in<\/span> range(<span class=\"hljs-number\">10<\/span>):\n    <span class=\"hljs-keyword\">if<\/span> num &gt; <span class=\"hljs-number\">5<\/span>:\n        print(<span class=\"hljs-string\">\"stop processing.\"<\/span>)\n        <span class=\"hljs-keyword\">break<\/span>\n    print(num)<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-15\"><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><button class=\"hljs-copy-button\" onclick=\"copy_code('code8', this);\"><i class=\"far fa-copy1\" aria-hidden=\"true\"><\/i><\/button><button class=\"hljs-run-button\" onclick=\"run_code('code8');\"><i class=\"far fa-play-circle\" aria-hidden=\"true\"><\/i> Run<\/button><\/div>\n\n\n<p><strong>Output<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">0\n1\n2\n3\n4\n5\nstop processing.<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-continue-statement-in-python\">Continue statement in python<\/h2>\n\n\n\n<p>The <a href=\"https:\/\/pynative.com\/python-break-continue-pass\/#h-continue-statement-in-python\">continue statement<\/a> is used to skip the current iteration and <code>continue<\/code> with the next iteration.<\/p>\n\n\n\n<p>Let&#8217;s see how to skip a for a loop iteration if the number is 5 and continue executing the body of the loop for other numbers.<\/p>\n\n\n\n<p><strong>Example of a <code>continue<\/code> statement<\/strong><\/p>\n\n\n<div class=\"hljstoolbar\"><pre id=\"code9\"  class=\"wp-block-code language-python\" aria-describedby=\"shcb-language-16\" data-shcb-language-name=\"Python\" data-shcb-language-slug=\"python\"><span><code class=\"hljs language-python\"><span class=\"hljs-keyword\">for<\/span> num <span class=\"hljs-keyword\">in<\/span> range(<span class=\"hljs-number\">3<\/span>, <span class=\"hljs-number\">8<\/span>):\n    <span class=\"hljs-keyword\">if<\/span> num == <span class=\"hljs-number\">5<\/span>:\n        <span class=\"hljs-keyword\">continue<\/span>\n    <span class=\"hljs-keyword\">else<\/span>:\n        print(num)<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-16\"><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><button class=\"hljs-copy-button\" onclick=\"copy_code('code9', this);\"><i class=\"far fa-copy1\" aria-hidden=\"true\"><\/i><\/button><button class=\"hljs-run-button\" onclick=\"run_code('code9');\"><i class=\"far fa-play-circle\" aria-hidden=\"true\"><\/i> Run<\/button><\/div>\n\n\n<p><strong>Output<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">3\n4\n6\n7<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-pass-statement-in-python\">Pass statement in Python<\/h2>\n\n\n\n<p>The pass is the keyword In Python, which won&#8217;t do anything. Sometimes there is a situation in programming where we need to define a syntactically empty block. We can define that block with the pass keyword.<\/p>\n\n\n\n<p>A <a href=\"https:\/\/pynative.com\/python-break-continue-pass\/#h-pass-statement-in-python\">pass statement<\/a> is a Python null statement. When the interpreter finds a pass statement in the program, it returns no operation. Nothing happens when the <code>pass<\/code> statement is executed.<\/p>\n\n\n\n<p>It is useful in a situation where we are implementing new methods or also in exception handling. It plays a role like a placeholder.<\/p>\n\n\n\n<p><strong>Example<\/strong><\/p>\n\n\n<div class=\"hljstoolbar\"><pre id=\"code10\"  class=\"wp-block-code language-python\" aria-describedby=\"shcb-language-17\" data-shcb-language-name=\"Python\" data-shcb-language-slug=\"python\"><span><code class=\"hljs language-python\">months = &#91;<span class=\"hljs-string\">'January'<\/span>, <span class=\"hljs-string\">'June'<\/span>, <span class=\"hljs-string\">'March'<\/span>, <span class=\"hljs-string\">'April'<\/span>]\n<span class=\"hljs-keyword\">for<\/span> mon <span class=\"hljs-keyword\">in<\/span> months:\n    <span class=\"hljs-keyword\">pass<\/span>\nprint(months)<\/code><\/span><small class=\"shcb-language\" id=\"shcb-language-17\"><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><button class=\"hljs-copy-button\" onclick=\"copy_code('code10', this);\"><i class=\"far fa-copy1\" aria-hidden=\"true\"><\/i><\/button><button class=\"hljs-run-button\" onclick=\"run_code('code10');\"><i class=\"far fa-play-circle\" aria-hidden=\"true\"><\/i> Run<\/button><\/div>\n\n\n<p><strong>Output<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">['January', 'June', 'March', 'April']<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>In Python programming, flow control is the order in which statements or blocks of code are executed at runtime based on a condition. Also See: Python If-else and Loops Exercise Python if else and Loops Quiz Control Flow Statements The flow control statements are divided into three categories Conditional statements Iterative statements. Transfer statements Conditional [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_genesis_hide_title":false,"_genesis_hide_breadcrumbs":false,"_genesis_hide_singular_image":false,"_genesis_hide_footer_widgets":false,"_genesis_custom_body_class":"","_genesis_custom_post_class":"","_genesis_layout":"","footnotes":""},"categories":[22,1],"tags":[32],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v22.4 (Yoast SEO v22.4) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Python Control Flow Statements and Loops &#8211; PYnative<\/title>\n<meta name=\"description\" content=\"Learn Python Conditional statements such as if, if-else, Iterative statement for loop and while loop, Transfer statements such as break, continue, pass\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/pynative.com\/python-control-flow-statements\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Python Control Flow Statements and Loops\" \/>\n<meta property=\"og:description\" content=\"Learn Python Conditional statements such as if, if-else, Iterative statement for loop and while loop, Transfer statements such as break, continue, pass\" \/>\n<meta property=\"og:url\" content=\"https:\/\/pynative.com\/python-control-flow-statements\/\" \/>\n<meta property=\"og:site_name\" content=\"PYnative\" \/>\n<meta property=\"article:published_time\" content=\"2021-03-03T16:34:27+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2021-07-25T12:28:41+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/pynative.com\/wp-content\/uploads\/2021\/03\/python-flow-control-statements.png\" \/>\n<meta name=\"author\" content=\"Vishal\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@PyNative\" \/>\n<meta name=\"twitter:site\" content=\"@PyNative\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Vishal\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"7 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/pynative.com\/python-control-flow-statements\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/pynative.com\/python-control-flow-statements\/\"},\"author\":{\"name\":\"Vishal\",\"@id\":\"https:\/\/pynative.com\/#\/schema\/person\/64b55d5bde2265918c5a9931de4de71f\"},\"headline\":\"Python Control Flow Statements and Loops\",\"datePublished\":\"2021-03-03T16:34:27+00:00\",\"dateModified\":\"2021-07-25T12:28:41+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/pynative.com\/python-control-flow-statements\/\"},\"wordCount\":1000,\"commentCount\":15,\"publisher\":{\"@id\":\"https:\/\/pynative.com\/#\/schema\/person\/64b55d5bde2265918c5a9931de4de71f\"},\"image\":{\"@id\":\"https:\/\/pynative.com\/python-control-flow-statements\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/pynative.com\/wp-content\/uploads\/2021\/03\/python-flow-control-statements.png\",\"keywords\":[\"Python Basics\"],\"articleSection\":[\"Python\",\"Python Basics\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/pynative.com\/python-control-flow-statements\/#respond\"]}],\"accessibilityFeature\":[\"tableOfContents\"]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/pynative.com\/python-control-flow-statements\/\",\"url\":\"https:\/\/pynative.com\/python-control-flow-statements\/\",\"name\":\"Python Control Flow Statements and Loops &#8211; 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