{"id":4160,"date":"2021-04-27T19:00:42","date_gmt":"2021-04-27T13:30:42","guid":{"rendered":"https:\/\/python-programs.com\/?p=4160"},"modified":"2021-11-22T18:43:04","modified_gmt":"2021-11-22T13:13:04","slug":"python-how-to-sort-a-list-of-tuples-by-second-item","status":"publish","type":"post","link":"https:\/\/python-programs.com\/python-how-to-sort-a-list-of-tuples-by-second-item\/","title":{"rendered":"Python: How to Sort a List of Tuples by second Item"},"content":{"rendered":"<p>Tuples are a type of variable that allows you to store multiple items in a single variable. Tuple is one of four built-in data types in Python that are used to store data collections. The other three are List, Set, and Dictionary, all of which have different qualities and applications. A tuple is a collection that is both ordered and immutable.<\/p>\n<p>The task is to write a Python program that sorts tuples by the second item in each tuple given a list of tuples.<\/p>\n<p><strong>Examples:<\/strong><\/p>\n<p><strong>Input:<\/strong><\/p>\n<pre>giventuple = [('Hello', 400), ('this', 500), ('is', 200), ('BTechGeeks', 100)]<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">[('BTechGeeks', 100), ('is', 200), ('Hello', 400), ('this', 500)]<\/pre>\n<h2>Python program for Sorting a List of Tuples by the Second item<\/h2>\n<ul>\n<li><a href=\"#Key_Function\">Key Function<\/a><\/li>\n<li><a href=\"#Using_lambda_function\">Using lambda function<\/a><\/li>\n<li><a href=\"#Using_lambda_function\">Using lambda function<\/a><\/li>\n<\/ul>\n<h3 id=\"Key_Function\">1)Key Function<\/h3>\n<p>When sorting a list, all of the list&#8217;s elements are compared to one another. However, before comparing the entries, it will call the key function on each entry to determine which portion of the object will be compared.<\/p>\n<p>In other words, when an element is passed to the key function, it returns the element that should be used to compare the elements in the list while sorting.<\/p>\n<h3 id=\"Using_lambda_function\">2)Using lambda function<\/h3>\n<p>To sort a list of tuples by the second or ith item, we must include our custom comparator, i.e. key function, in the\u00a0 sort () function.<\/p>\n<p>We use lambda function as key function.<\/p>\n<p><strong>Below is the implementation:<\/strong><\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\"># given tuple\r\ngiventuple = [('Hello', 400), ('this', 500), ('is', 200), ('BTechGeeks', 100)]\r\n# using lambda function\r\ngiventuple.sort(key=lambda elem: elem[1])\r\n# print giventuple\r\nprint(giventuple)\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">[('BTechGeeks', 100), ('is', 200), ('Hello', 400), ('this', 500)]<\/pre>\n<h3 id=\"Using_lambda_function\">3)Using custom function as comparator<\/h3>\n<p>First, create a function that accepts a tuple and returns the second element.<\/p>\n<p><strong>Below is the implementation:<\/strong><\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">def comparator(elementtuple):\r\n    return elementtuple[1]\r\n\r\n\r\n# given tuple\r\ngiventuple = [('Hello', 400), ('this', 500), ('is', 200), ('BTechGeeks', 100)]\r\n# using lambda function\r\ngiventuple.sort(key=comparator)\r\n# print giventuple\r\nprint(giventuple)\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">[('BTechGeeks', 100), ('is', 200), ('Hello', 400), ('this', 500)]<\/pre>\n<p><strong>Related Programs<\/strong>:<\/p>\n<ul>\n<li><a href=\"https:\/\/python-programs.com\/python-program-to-sort-a-list-of-tuples-in-increasing-order-by-the-last-element-in-each-tuple\/\">python program to sort a list of tuples in increasing order by the last element in each tuple<\/li>\n<li><a href=\"https:\/\/python-programs.com\/python-how-to-find-all-indexes-of-an-item-in-a-list\/\">python how to find all indexes of an item in a list<\/li>\n<li><a href=\"https:\/\/python-programs.com\/python-how-to-sort-a-list-of-strings-list-sort\/\">python how to sort a list of strings list sort<\/li>\n<li><a href=\"https:\/\/python-programs.com\/python-program-to-create-a-list-of-tuples-with-the-first-element-as-the-number-and-second-element-as-the-square-of-the-number\/\">python program to create a list of tuples with the first element as the number and second element as the square of the number<\/li>\n<li><a href=\"https:\/\/python-programs.com\/cpp-how-to-sort-a-list-of-objects-with-custom-comparator-or-lambda-function\/\">cpp how to sort a list of objects with custom comparator or lambda function<\/li>\n<li><a href=\"https:\/\/python-programs.com\/how-to-create-and-initialize-a-list-of-lists-in-python\/\">how to create and initialize a list of lists in python<\/li>\n<li><a href=\"https:\/\/python-programs.com\/python-how-to-sort-a-dictionary-by-key-or-value\/\">python how to sort a dictionary by key or value<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Tuples are a type of variable that allows you to store multiple items in a single variable. Tuple is one of four built-in data types in Python that are used to store data collections. The other three are List, Set, and Dictionary, all of which have different qualities and applications. A tuple is a collection &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/python-programs.com\/python-how-to-sort-a-list-of-tuples-by-second-item\/\"> <span class=\"screen-reader-text\">Python: How to Sort a List of Tuples by second Item<\/span> Read More &raquo;<\/a><\/p>\n","protected":false},"author":7,"featured_media":4984,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":"","jetpack_publicize_message":"","jetpack_is_tweetstorm":false,"jetpack_publicize_feature_enabled":true},"categories":[5],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v18.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Python: How to Sort a List of Tuples by second Item - Python Programs<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/python-programs.com\/python-how-to-sort-a-list-of-tuples-by-second-item\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Python: How to Sort a List of Tuples by second Item - Python Programs\" \/>\n<meta property=\"og:description\" content=\"Tuples are a type of variable that allows you to store multiple items in a single variable. Tuple is one of four built-in data types in Python that are used to store data collections. The other three are List, Set, and Dictionary, all of which have different qualities and applications. 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