{"id":173415,"date":"2023-11-13T13:13:10","date_gmt":"2023-11-13T12:13:10","guid":{"rendered":"https:\/\/datascientest.com\/en\/?p=173415"},"modified":"2023-11-13T13:13:58","modified_gmt":"2023-11-13T12:13:58","slug":"mastering-control-flow-the-power-and-versatility-of-the-for-loop-in-programming","status":"publish","type":"post","link":"https:\/\/datascientest.com\/en\/mastering-control-flow-the-power-and-versatility-of-the-for-loop-in-programming","title":{"rendered":"Mastering Control Flow: The Power and Versatility of the For Loop in Programming"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"173415\" class=\"elementor elementor-173415\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t\t<div class=\"elementor-element elementor-element-f169fdd e-flex e-con-boxed e-con\" data-id=\"f169fdd\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-21982c5 elementor-widget elementor-widget-heading\" data-id=\"21982c5\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! elementor - v3.15.0 - 02-08-2023 *\/\n.elementor-heading-title{padding:0;margin:0;line-height:1}.elementor-widget-heading .elementor-heading-title[class*=elementor-size-]>a{color:inherit;font-size:inherit;line-height:inherit}.elementor-widget-heading .elementor-heading-title.elementor-size-small{font-size:15px}.elementor-widget-heading .elementor-heading-title.elementor-size-medium{font-size:19px}.elementor-widget-heading .elementor-heading-title.elementor-size-large{font-size:29px}.elementor-widget-heading .elementor-heading-title.elementor-size-xl{font-size:39px}.elementor-widget-heading .elementor-heading-title.elementor-size-xxl{font-size:59px}<\/style><h3 class=\"elementor-heading-title elementor-size-default\">What is a \"for loop\"?<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-c6c1d95 elementor-widget elementor-widget-text-editor\" data-id=\"c6c1d95\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<style>\/*! elementor - v3.15.0 - 02-08-2023 *\/\n.elementor-widget-text-editor.elementor-drop-cap-view-stacked .elementor-drop-cap{background-color:#69727d;color:#fff}.elementor-widget-text-editor.elementor-drop-cap-view-framed .elementor-drop-cap{color:#69727d;border:3px solid;background-color:transparent}.elementor-widget-text-editor:not(.elementor-drop-cap-view-default) .elementor-drop-cap{margin-top:8px}.elementor-widget-text-editor:not(.elementor-drop-cap-view-default) .elementor-drop-cap-letter{width:1em;height:1em}.elementor-widget-text-editor .elementor-drop-cap{float:left;text-align:center;line-height:1;font-size:50px}.elementor-widget-text-editor .elementor-drop-cap-letter{display:inline-block}<\/style>\t\t\t\t<p>In<a href=\"https:\/\/datascientest.com\/en\/demystifying-fortran-a-comprehensive-introduction-to-the-first-programming-language\"> programming<\/a>, iterables are used to designate objects that group together a collection of objects that can be browsed. Iterables include lists, tuples, dictionaries and strings, to name but a few.<\/p><p>For loops are used to browse iterables and repeat a sequence of instructions for each element<\/p><p>The code to be executed is then repeated as many times as the number of elements contained in our iterable. As an essential part of programming, for loops are used in all <strong>data-related professions<\/strong>: <a href=\"https:\/\/datascientest.com\/en\/data-analyst-salary-average-salary-revealed\">data analysts<\/a>, data scientists and data engineers.<\/p><p>In this article, we&#8217;ll look at how to use the &#8216;for&#8217; statement on different types of object, and how for loops can be used to respond to the famous programming adage &#8216;Don&#8217;t Repeat Yourself&#8217;.<\/p><p>To familiarise ourselves with the use of loops, we will first learn how to use them on list items.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-4d24b85 e-flex e-con-boxed e-con\" data-id=\"4d24b85\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-f80204e elementor-widget elementor-widget-heading\" data-id=\"f80204e\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Using a loop to iterate through a list with the \"For\" instruction<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3abd336 elementor-widget elementor-widget-text-editor\" data-id=\"3abd336\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p><strong>We&#8217;re going to create a for loop<\/strong> to retrieve the first name of each student in a &#8220;students&#8221; variable of type list, which is made up of the first name and surname of the students. Then we add the first names to the &#8220;first_names&#8221; list.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-538d966 elementor-widget elementor-widget-shortcode\" data-id=\"538d966\" data-element_type=\"widget\" data-widget_type=\"shortcode.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-shortcode\"><script src=\"https:\/\/gist.github.com\/maelysBB\/7d6a2a8b204845bf8a2deaf92a38a572.js\"><\/script><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-cf7bbd7 e-flex e-con-boxed e-con\" data-id=\"cf7bbd7\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-e32a898 elementor-widget elementor-widget-heading\" data-id=\"e32a898\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Use Range to iterate :<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-09304ff elementor-widget elementor-widget-text-editor\" data-id=\"09304ff\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>The range function allows us to iterate over a sequence of numbers defined on a certain interval. Below, we display the value of each integer in the interval [0, 5[ (note that 0 is included but 5 is excluded).<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-62e25df elementor-widget elementor-widget-shortcode\" data-id=\"62e25df\" data-element_type=\"widget\" data-widget_type=\"shortcode.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-shortcode\"><script src=\"https:\/\/gist.github.com\/maelysBB\/433c2eea5b2da436ea9c02ccc29269a2.js\"><\/script><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-57047d0 elementor-widget elementor-widget-text-editor\" data-id=\"57047d0\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>By default, the range function takes 0 as the starting value, but it is also possible to change the starting value.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-eb0fa12 elementor-widget elementor-widget-shortcode\" data-id=\"eb0fa12\" data-element_type=\"widget\" data-widget_type=\"shortcode.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-shortcode\"><script src=\"https:\/\/gist.github.com\/maelysBB\/ef15bd6164326ffcd730c89661d23850.js\"><\/script><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-13c780f elementor-widget elementor-widget-text-editor\" data-id=\"13c780f\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>The range function can also be used to change the step between each value in the range:<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3a96dfb elementor-widget elementor-widget-shortcode\" data-id=\"3a96dfb\" data-element_type=\"widget\" data-widget_type=\"shortcode.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-shortcode\"><script src=\"https:\/\/gist.github.com\/maelysBB\/1ce63c4403fc3904dbb6672fbce2e0f9.js\"><\/script><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a6a586b elementor-widget elementor-widget-text-editor\" data-id=\"a6a586b\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>Using the range function, it is also possible to iterate in the opposite direction, taking a negative step:<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4baeb3e elementor-widget elementor-widget-shortcode\" data-id=\"4baeb3e\" data-element_type=\"widget\" data-widget_type=\"shortcode.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-shortcode\"><script src=\"https:\/\/gist.github.com\/maelysBB\/7758ed5d209ffeff264a63050a2b7a67.js\"><\/script><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-acef1a6 e-flex e-con-boxed e-con\" data-id=\"acef1a6\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-609f903 elementor-widget elementor-widget-heading\" data-id=\"609f903\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Using nested iterations<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-719e6f2 elementor-widget elementor-widget-text-editor\" data-id=\"719e6f2\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>A<strong> nested iteration is a loop<\/strong> located inside another loop. The nested loop will be executed for each iteration of the loop above it.<\/p><p>In the example below, we iterate over each first name in the &#8220;first_names&#8221; list, which is of type string. Then, using a nested loop, we iterate over each letter of the first name and display the letter, its number and the number of the first name to which the letter belongs.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b31b251 elementor-widget elementor-widget-shortcode\" data-id=\"b31b251\" data-element_type=\"widget\" data-widget_type=\"shortcode.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-shortcode\"><script src=\"https:\/\/gist.github.com\/maelysBB\/d583ff49eb499b6a9dc61f46f291308c.js\"><\/script><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d5f1e1b elementor-widget elementor-widget-text-editor\" data-id=\"d5f1e1b\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>Rather than initiating a counter manually, we can use range to iterate over the number of elements in our iterable :<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a628a97 elementor-widget elementor-widget-shortcode\" data-id=\"a628a97\" data-element_type=\"widget\" data-widget_type=\"shortcode.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-shortcode\"><script src=\"https:\/\/gist.github.com\/maelysBB\/ab383a33f8bee6948863b2309067af81.js\"><\/script><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-b32ec79 e-flex e-con-boxed e-con\" data-id=\"b32ec79\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-e97ee71 elementor-widget elementor-widget-heading\" data-id=\"e97ee71\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Use enumerate to benefit from an automatic element counter<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-993aea0 elementor-widget elementor-widget-text-editor\" data-id=\"993aea0\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>Python has an enumerate() function which returns a tuple for each iteration, containing the index and the value of the iterable at that index.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-153d317 elementor-widget elementor-widget-shortcode\" data-id=\"153d317\" data-element_type=\"widget\" data-widget_type=\"shortcode.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-shortcode\"><script src=\"https:\/\/gist.github.com\/maelysBB\/236dae8938531ba6edc69623136863df.js\"><\/script><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-828f855 elementor-widget elementor-widget-text-editor\" data-id=\"828f855\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>Note that the output of the last three examples is the same, but the code of the last two solutions is more optimised.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-d817813 e-flex e-con-boxed e-con\" data-id=\"d817813\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-9219bb4 elementor-widget elementor-widget-heading\" data-id=\"9219bb4\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Iterating on several iterables at the same time with Zip<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6fac462 elementor-widget elementor-widget-text-editor\" data-id=\"6fac462\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>You can use the built-in zip() function to iterate through several iterables at the same time. For each iteration, zip returns a tuple containing the elements located at the same position in each of the iterables.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-98f0571 elementor-widget elementor-widget-shortcode\" data-id=\"98f0571\" data-element_type=\"widget\" data-widget_type=\"shortcode.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-shortcode\"><script src=\"https:\/\/gist.github.com\/maelysBB\/0309b32611c8a562da678999e8fd7082.js\"><\/script><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-01a779f elementor-widget elementor-widget-text-editor\" data-id=\"01a779f\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>Using the for loop and zip, we can create a &#8220;names&#8221; list containing the first and last names of each student.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-b33851e e-flex e-con-boxed e-con\" data-id=\"b33851e\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-c7af9cb elementor-widget elementor-widget-heading\" data-id=\"c7af9cb\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Exit a loop with the Break instruction<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0876f4a elementor-widget elementor-widget-text-editor\" data-id=\"0876f4a\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>It is possible to <strong>exit a loop<\/strong> if a particular condition is met by using &#8220;break&#8221;. As long as the condition is not verified, the loop is executed normally. As soon as the condition is true, the program exits the loop and moves on to the instruction after it.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-f7921a2 elementor-widget elementor-widget-shortcode\" data-id=\"f7921a2\" data-element_type=\"widget\" data-widget_type=\"shortcode.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-shortcode\"><script src=\"https:\/\/gist.github.com\/maelysBB\/6cb1fc10d036ec97c91ff5ffb641cbc8.js\"><\/script><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3ec2cbe elementor-widget elementor-widget-text-editor\" data-id=\"3ec2cbe\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>A <strong>logical expression is used to check the condition<\/strong>. For example, above, we exit the loop if the type of an element in the list is not of type string. The loop was exited before displaying the element at index 2, which is of type int and not string.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-f630e68 e-flex e-con-boxed e-con\" data-id=\"f630e68\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-754f21c elementor-widget elementor-widget-heading\" data-id=\"754f21c\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Go to the next iteration by skipping the current iteration with the continue instruction<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7ee6658 elementor-widget elementor-widget-text-editor\" data-id=\"7ee6658\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>It is possible to skip the iteration you are in if a particular condition is met by using the <a href=\"https:\/\/datascientest.com\/en\/unlocking-the-power-of-webhooks-a-guide-to-understanding-and-implementing-them-with-python\">python instruction<\/a> &#8220;continue&#8221;. If the condition is true, the program will remain in the loop but will go directly to the next iteration.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2775467 elementor-widget elementor-widget-shortcode\" data-id=\"2775467\" data-element_type=\"widget\" data-widget_type=\"shortcode.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-shortcode\"><script src=\"https:\/\/gist.github.com\/maelysBB\/325f4167a1eee1d41ccb25be614d11bb.js\"><\/script><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-67403b0 elementor-widget elementor-widget-text-editor\" data-id=\"67403b0\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>We can see above that the loop has been executed except at index no.2, where the type of the element is int.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-7141fe3 e-flex e-con-boxed e-con\" data-id=\"7141fe3\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-e48e266 elementor-widget elementor-widget-heading\" data-id=\"e48e266\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">List Comprehensions<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2c3e405 elementor-widget elementor-widget-text-editor\" data-id=\"2c3e405\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>To simplify writing for loops on lists, you can use List Comprehensions, which make it easier to declare or modify list variables.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8dabec1 elementor-widget elementor-widget-shortcode\" data-id=\"8dabec1\" data-element_type=\"widget\" data-widget_type=\"shortcode.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-shortcode\"><script src=\"https:\/\/gist.github.com\/maelysBB\/414be7def5e5ec5a711efc8f42ec70bd.js\"><\/script><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-98b7555 elementor-widget elementor-widget-text-editor\" data-id=\"98b7555\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>It is also possible to use nested List Comprehensions to create multi-dimensional lists.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-0e1e5de elementor-widget elementor-widget-shortcode\" data-id=\"0e1e5de\" data-element_type=\"widget\" data-widget_type=\"shortcode.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-shortcode\"><script src=\"https:\/\/gist.github.com\/maelysBB\/ecd594c67a68c5a1f5b35cce8e8082a8.js\"><\/script><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-286e59a elementor-widget elementor-widget-text-editor\" data-id=\"286e59a\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>The code above does in 1 line what the code below does in 6 lines.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-088c973 elementor-widget elementor-widget-shortcode\" data-id=\"088c973\" data-element_type=\"widget\" data-widget_type=\"shortcode.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-shortcode\"><script src=\"https:\/\/gist.github.com\/maelysBB\/156278f4d8e6fb59856ff06ffb5a32f9.js\"><\/script><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-abbf975 elementor-widget elementor-widget-text-editor\" data-id=\"abbf975\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>We&#8217;ve just seen several uses for for loops on lists (and also strings). In the rest of this article, we&#8217;ll look at how to iterate over other types of object.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-7a8ddd2 e-flex e-con-boxed e-con\" data-id=\"7a8ddd2\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-aba266d elementor-widget elementor-widget-heading\" data-id=\"aba266d\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Iterate on a dictionary<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-fe40ef5 elementor-widget elementor-widget-text-editor\" data-id=\"fe40ef5\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>An instruction can be repeated on a dictionary using the .items() method.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e079353 elementor-widget elementor-widget-shortcode\" data-id=\"e079353\" data-element_type=\"widget\" data-widget_type=\"shortcode.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-shortcode\"><script src=\"https:\/\/gist.github.com\/maelysBB\/dbe66a9834ce31083d51e801db353f53.js\"><\/script><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7bf6d7c elementor-widget elementor-widget-text-editor\" data-id=\"7bf6d7c\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>Python also supports the use of dictionary comprehensions called Dict Comprehensions :<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-13451cb elementor-widget elementor-widget-shortcode\" data-id=\"13451cb\" data-element_type=\"widget\" data-widget_type=\"shortcode.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-shortcode\"><script src=\"https:\/\/gist.github.com\/maelysBB\/5ea0ec0471c215137e26d9d24d67c20d.js\"><\/script><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-f2ee019 e-flex e-con-boxed e-con\" data-id=\"f2ee019\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-a4232c1 elementor-widget elementor-widget-heading\" data-id=\"a4232c1\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Iterating on a Numpy Array<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7a0e464 elementor-widget elementor-widget-text-editor\" data-id=\"7a0e464\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>It is possible to iterate over the different dimensions of a <a href=\"https:\/\/datascientest.com\/en\/numpy-the-python-library-in-data-science\">Numpy array<\/a> using for loops:<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-db6b83a elementor-widget elementor-widget-shortcode\" data-id=\"db6b83a\" data-element_type=\"widget\" data-widget_type=\"shortcode.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-shortcode\"><script src=\"https:\/\/gist.github.com\/maelysBB\/83a9a0ac9e4da205267f06f422ac8e4a.js\"><\/script><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-be7620f elementor-widget elementor-widget-text-editor\" data-id=\"be7620f\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>Using the nditer function and a loop, we can also access each element in our Numpy array directly.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-19fb4d9 elementor-widget elementor-widget-shortcode\" data-id=\"19fb4d9\" data-element_type=\"widget\" data-widget_type=\"shortcode.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-shortcode\"><script src=\"https:\/\/gist.github.com\/maelysBB\/e50633f1f57a38ec4f106fca3caceceb.js\"><\/script><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-aa27419 e-flex e-con-boxed e-con\" data-id=\"aa27419\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-ff8cbbb elementor-widget elementor-widget-heading\" data-id=\"ff8cbbb\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">Iterate on a Pandas dataframe<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d325abe elementor-widget elementor-widget-text-editor\" data-id=\"d325abe\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>To iterate over each line of a <a href=\"https:\/\/datascientest.com\/en\/pandas-the-python-library\">Pandas dataframe<\/a>, you can use iterrows.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-7082bdf elementor-widget elementor-widget-shortcode\" data-id=\"7082bdf\" data-element_type=\"widget\" data-widget_type=\"shortcode.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-shortcode\"><script src=\"https:\/\/gist.github.com\/maelysBB\/801c3987e27db54f0f8b9bef9992813a.js\"><\/script><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-ad8632a e-flex e-con-boxed e-con\" data-id=\"ad8632a\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-7fc89a5 elementor-widget elementor-widget-heading\" data-id=\"7fc89a5\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<h3 class=\"elementor-heading-title elementor-size-default\">A few words in conclusion<\/h3>\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2197e8c elementor-widget elementor-widget-text-editor\" data-id=\"2197e8c\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<p>In this article, we have seen that for loops save precious time and optimise our code. We have seen how to use them, from a basic to an <strong>advanced level.<\/strong> To get to grips with this programming essential, don&#8217;t hesitate to practise and use them on different types of object.<\/p><p>For loops are used in all <strong>data-related professions.<\/strong> If you&#8217;re thinking of training for one of these professions, take a look at our various courses.<\/p>\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-affaba6 elementor-align-center button-principale elementor-widget elementor-widget-button\" data-id=\"affaba6\" data-element_type=\"widget\" data-widget_type=\"button.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<div class=\"elementor-button-wrapper\">\n\t\t\t<a class=\"elementor-button elementor-button-link elementor-size-sm elementor-animation-grow\" href=\"https:\/\/datascientest.com\/en\/data-courses\">\n\t\t\t\t\t\t<span class=\"elementor-button-content-wrapper\">\n\t\t\t\t\t\t<span class=\"elementor-button-text\">Discover our courses<\/span>\n\t\t<\/span>\n\t\t\t\t\t<\/a>\n\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-877338f e-flex e-con-boxed e-con\" data-id=\"877338f\" data-element_type=\"container\" data-settings=\"{&quot;content_width&quot;:&quot;boxed&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-81ee763 elementor-widget elementor-widget-html\" data-id=\"81ee763\" data-element_type=\"widget\" data-widget_type=\"html.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t<script type=\"application\/ld+json\">\n{\n  \"@context\": \"https:\/\/schema.org\",\n  \"@type\": \"FAQPage\",\n  \"mainEntity\": [{\n    \"@type\": \"Question\",\n    \"name\": \"What is a \"for loop\"?\",\n    \"acceptedAnswer\": {\n      \"@type\": \"Answer\",\n      \"text\": \"In programming, iterables are used to designate objects that group together a collection of objects that can be browsed. Iterables include lists, tuples, dictionaries and strings. For loops are used to browse through iterables and repeat a sequence of instructions for each element. The code to be executed is then repeated as many times as the number of elements contained in our iterable. As a programming essential, for loops are used in all data-related professions: data analysts, data scientists and data engineers.\n    }\n  },{\n    \"@type\": \"Question\",\n    \"name\": \"Use a loop to iterate over a list using the \"For\" statement\",\n    \"acceptedAnswer\": {\n      \"@type\": \"Answer\",\n      \"text\": \"We're going to create a for loop to retrieve the first name of each student in a \"students\" variable of type list, which is made up of the first name and surname of the students. Then we add the first names to the \"first_names\" list.\"\n    }\n  },{\n    \"@type\": \"Question\",\n    \"name\": \"Use nested iterations\",\n    \"acceptedAnswer\": {\n      \"@type\": \"Answer\",\n      \"text\": \"A nested iteration is a loop inside another loop. The nested loop will be executed for each iteration of the loop above it. In the example below, we iterate over each first name in the \"first_names\" list, which is of type string. Then, using a nested loop, we iterate over each letter of the first name and display the letter, its number, and the number of the first name to which the letter belongs.\"\n    }\n  },{\n    \"@type\": \"Question\",\n    \"name\": \"Exit a loop with the Break instruction\",\n    \"acceptedAnswer\": {\n      \"@type\": \"Answer\",\n      \"text\": \"It is possible to exit a loop if a particular condition is encountered using \"break\". As long as the condition is not verified, the loop is executed normally. As soon as the condition is true, the program exits the loop and moves on to the instruction after it.\"\n    }\n  }]\n}\n<\/script\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>What is a &#8220;for loop&#8221;? In programming, iterables are used to designate objects that group together a collection of objects that can be browsed. Iterables include lists, tuples, dictionaries and strings, to name but a few. For loops are used to browse iterables and repeat a sequence of instructions for each element The code to [&hellip;]<\/p>\n","protected":false},"author":67,"featured_media":173424,"comment_status":"open","ping_status":"open","sticky":false,"template":"elementor_theme","format":"standard","meta":{"content-type":"","inline_featured_image":false},"categories":[2421],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.7 (Yoast SEO v21.7) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Mastering Control Flow: The Power and Versatility of the For Loop in Programming<\/title>\n<meta name=\"description\" content=\"Explore the cornerstone of programming with our guide on the for loop. 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