{"id":12785,"date":"2022-10-01T22:12:42","date_gmt":"2022-10-01T16:42:42","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-the-difference-between-zip-and-enumerat-in-for-loop-closed\/"},"modified":"2022-10-01T22:12:42","modified_gmt":"2022-10-01T16:42:42","slug":"solved-the-difference-between-zip-and-enumerat-in-for-loop-closed","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-the-difference-between-zip-and-enumerat-in-for-loop-closed\/","title":{"rendered":"[Solved] the difference between zip and enumerat in for loop? [closed]"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-30731308\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"30731308\" data-parentid=\"30731114\" data-score=\"3\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<p>At issue here is your use of the <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/docs.python.org\/2\/library\/functions.html#zip\"><code>zip()<\/code> function<\/a>. It produces a <em>list<\/em> of tuples <strong>up front<\/strong>. You created a copy of the original list with numbers added. From the documentation:<\/p>\n<blockquote>\n<p>This function <strong>returns a list of tuples<\/strong>, where the <em>i<\/em>-th tuple contains the <em>i<\/em>-th element from each of the argument sequences or iterables.<\/p>\n<\/blockquote>\n<p><em>Emphasis mine<\/em>.<\/p>\n<p>Thus, altering the <code>elem_l<\/code> in the loop does not affect the loop iteration count.<\/p>\n<p><code>enumerate()<\/code> on the other hand produces indices <em>on demand<\/em>, and as the <code>elem_l<\/code> list is deleted from, there are fewer elements to produce. You&#8217;d get the same outcome if you produced a copy of <code>elem_l<\/code> instead:<\/p>\n<pre><code>for i, e in enumerate(elem_l[:]):\n<\/code><\/pre>\n<p>where the <code>[:]<\/code> identity slice produces a new list, independent of the original <code>elem_l<\/code> list you then delete from in the loop.<\/p>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\">1<\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved the difference between zip and enumerat in for loop? [closed] <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] At issue here is your use of the zip() function. It produces a list of tuples up front. You created a copy of the original list with numbers added. From the documentation: This function returns a list of tuples, where the i-th tuple contains the i-th element from each of the argument sequences or &#8230; <a title=\"[Solved] the difference between zip and enumerat in for loop? [closed]\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-the-difference-between-zip-and-enumerat-in-for-loop-closed\/\" aria-label=\"More on [Solved] the difference between zip and enumerat in for loop? [closed]\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[391,349],"class_list":["post-12785","post","type-post","status-publish","format-standard","hentry","category-solved","tag-loops","tag-python"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] the difference between zip and enumerat in for loop? 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