{"id":2833,"date":"2021-04-17T16:05:07","date_gmt":"2021-04-17T10:35:07","guid":{"rendered":"https:\/\/python-programs.com\/?p=2833"},"modified":"2021-11-22T18:45:11","modified_gmt":"2021-11-22T13:15:11","slug":"python-check-if-there-are-duplicates-in-a-list","status":"publish","type":"post","link":"https:\/\/python-programs.com\/python-check-if-there-are-duplicates-in-a-list\/","title":{"rendered":"Python Check If there are Duplicates in a List"},"content":{"rendered":"<p>Lists are similar to dynamically sized arrays (e.g., vector in C++ and ArrayList in Java) that are declared in other languages. Lists don&#8217;t always have to be homogeneous, which makes them a useful tool in Python. Integers, Strings, and Objects are all DataTypes that can be combined into a single list. Lists are mutable, meaning they can be modified after they&#8217;ve been formed.<\/p>\n<p>Duplicates are integers, strings, or items in a list that are repeated more than once.<\/p>\n<p>Given a list, the task is to check whether it has any duplicate element in it.<\/p>\n<p><strong>Examples:<\/strong><\/p>\n<p><strong>Input:<\/strong><\/p>\n<pre>givenlist=[\"hello\", \"this\", \"is\", \"BTechGeeks\" , \"hello\"]<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre>True<\/pre>\n<p><strong>Explanation:<\/strong><\/p>\n<pre>hello is repeated twice so the answer is Yes<\/pre>\n<h2>Check whether list contains any repeated values<\/h2>\n<p>There are several ways to check duplicate elements some of them are:<\/p>\n<ul>\n<li><a href=\"#Using_list_and_count()_function\">Using list and count() function<\/a><\/li>\n<li><a href=\"#Using_set()\">Using set()<\/a><\/li>\n<li><a href=\"#Using_Counter()_function_from_collections_(Hashing)\">Using Counter() function from collections (Hashing)<\/a><\/li>\n<\/ul>\n<h3 id=\"Using_list_and_count()_function\">Method #1 :Using list and count() function<\/h3>\n<p>The list class in Python has a method count() that returns the frequency count of a given list element.<\/p>\n<p><code class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">list.count(Element)<\/code><\/p>\n<p>It returns the number of times an element appears in the list.<\/p>\n<p><strong>Approach:<\/strong><\/p>\n<p>The idea is to iterate over all of the list&#8217;s elements and count the number of times each element appears.<\/p>\n<p>If the count is greater than one, this element has duplicate entries.<\/p>\n<p>Below is the implementation:<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\"># function which return true if duplicates are present in list else false\r\ndef checkDuplicates(givenlist):\r\n    # Traverse the list\r\n    for element in givenlist:\r\n        # checking the count\/frequency of each element\r\n        if(givenlist.count(element) &gt; 1):\r\n            return True\r\n    # if the above loop do not return anuthing then there are no duplicates\r\n    return False\r\n\r\n#Driver code\r\n# Given list\r\ngivenlist = [\"hello\", \"this\", \"is\", \"BTechGeeks\", \"hello\"]\r\n# passing this list to checkDuplicates function\r\nprint(checkDuplicates(givenlist))\r\n\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre>True<\/pre>\n<p><strong>Time Complexity :<\/strong> <strong>O(n^2)<\/strong><\/p>\n<h3 id=\"Using_set()\">Method #2 : Using set()<\/h3>\n<p>Follow the steps below to see if a list contains any duplicate elements.<\/p>\n<p>If the list does not contain any unhashable objects, such as list, use set().<\/p>\n<p>When a list is passed to set(), the function returns set, which ignores duplicate values and keeps only unique values as elements..<\/p>\n<p>Using the built-in function len(), calculate the number of elements in this set and the original list and compare them.<\/p>\n<p>If the number of elements is the same, there are no duplicate elements in the original list ,if the number of elements is different, there are duplicate elements in the original list.<\/p>\n<p>The following is the function that returns False if there are no duplicate elements and True if there are duplicate elements:<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\"># function which return true if duplicates are present in list else false\r\ndef checkDuplicates(givenlist):\r\n    # convert given list to set\r\n    setlist = set(givenlist)\r\n    # calculate length of set and list\r\n    setlength = len(setlist)\r\n    listlength = len(givenlist)\r\n    # return the comparision between set length and list length\r\n    return setlength != listlength\r\n\r\n\r\n# Driver code\r\n# Given list\r\ngivenlist = [\"hello\", \"this\", \"is\", \"BTechGeeks\", \"hello\"]\r\n# passing this list to checkDuplicates function\r\nprint(checkDuplicates(givenlist))\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre>True<\/pre>\n<p><strong>Time Complexity : <\/strong>O(n(log(n))<\/p>\n<h3 id=\"Using_Counter()_function_from_collections_(Hashing)\">Method #3: Using Counter() function from collections (Hashing)<\/h3>\n<p>Calculate the frequencies of all elements using Counter() function which will be stored as frequency dictionary.<\/p>\n<p>If the length of frequency dictionary is equal to length of list then it has no duplicates.<\/p>\n<p>Below is the implementation:<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\"># importing Counter function from collections\r\nfrom collections import Counter\r\n\r\n# function which return true if duplicates are present in list else false\r\n\r\n\r\ndef checkDuplicates(givenlist):\r\n    # Calculating frequency using counter() function\r\n    frequency = Counter(givenlist)\r\n    # compare these two lengths and return it\r\n    return len(frequency) != len(givenlist)\r\n\r\n\r\n# Driver code\r\n# Given list\r\ngivenlist = [\"hello\", \"this\", \"is\", \"BTechGeeks\", \"hello\"]\r\n# passing this list to checkDuplicates function\r\nprint(checkDuplicates(givenlist))\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre>True<\/pre>\n<p><strong>Time Complexity : <\/strong>O(n)<br \/>\n<strong>Related Programs<\/strong>:<\/p>\n<ul>\n<li><a href=\"https:\/\/python-programs.com\/python-check-if-all-elements-in-a-list-are-same-or-matches-a-condition\/\">python check if all elements in a list are same or matches a condition<\/a><\/li>\n<li><a href=\"https:\/\/python-programs.com\/check-if-all-elements-in-a-list-are-none-in-python\/\">check if all elements in a list are none in python<\/a><\/li>\n<li><a href=\"https:\/\/python-programs.com\/python-check-if-all-values-are-same-in-a-numpy-array-both-1d-and-2d\/\">python check if all values are same in a numpy array both 1d and 2d<\/a><\/li>\n<li><a href=\"https:\/\/python-programs.com\/python-check-if-a-value-exists-in-the-dictionary\/\">python check if a value exists in the dictionary<\/a><\/li>\n<li><a href=\"https:\/\/python-programs.com\/python-how-to-check-if-a-key-exists-in-dictionary\/\">python how to check if a key exists in dictionary<\/a><\/li>\n<li><a href=\"https:\/\/python-programs.com\/python-how-to-check-if-an-item-exists-in-list\/\">python how to check if an item exists in list<\/a><\/li>\n<li><a href=\"https:\/\/python-programs.com\/check-if-type-of-a-variable-is-string-in-python\/\">check if type of a variable is string in python<\/a><\/li>\n<\/ul>\n<p><strong>Related Programs<\/strong>:<\/p>\n<ul>\n<li><a href=\"https:\/\/python-programs.com\/python-check-if-all-elements-in-a-list-are-same-or-matches-a-condition\/\">python check if all elements in a list are same or matches a condition<\/li>\n<li><a href=\"https:\/\/python-programs.com\/check-if-all-elements-in-a-list-are-none-in-python\/\">check if all elements in a list are none in python<\/li>\n<li><a href=\"https:\/\/python-programs.com\/python-check-if-all-values-are-same-in-a-numpy-array-both-1d-and-2d\/\">python check if all values are same in a numpy array both 1d and 2d<\/li>\n<li><a href=\"https:\/\/python-programs.com\/python-check-if-a-value-exists-in-the-dictionary\/\">python check if a value exists in the dictionary<\/li>\n<li><a href=\"https:\/\/python-programs.com\/python-how-to-check-if-a-key-exists-in-dictionary\/\">python how to check if a key exists in dictionary<\/li>\n<li><a href=\"https:\/\/python-programs.com\/python-how-to-check-if-an-item-exists-in-list\/\">python how to check if an item exists in list<\/li>\n<li><a href=\"https:\/\/python-programs.com\/check-if-type-of-a-variable-is-string-in-python\/\">check if type of a variable is string in python<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Lists are similar to dynamically sized arrays (e.g., vector in C++ and ArrayList in Java) that are declared in other languages. Lists don&#8217;t always have to be homogeneous, which makes them a useful tool in Python. Integers, Strings, and Objects are all DataTypes that can be combined into a single list. Lists are mutable, meaning &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/python-programs.com\/python-check-if-there-are-duplicates-in-a-list\/\"> <span class=\"screen-reader-text\">Python Check If there are Duplicates in a List<\/span> Read More &raquo;<\/a><\/p>\n","protected":false},"author":7,"featured_media":6760,"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 Check If there are Duplicates in a List - 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-check-if-there-are-duplicates-in-a-list\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Python Check If there are Duplicates in a List - Python Programs\" \/>\n<meta property=\"og:description\" content=\"Lists are similar to dynamically sized arrays (e.g., vector in C++ and ArrayList in Java) that are declared in other languages. 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Lists don&#8217;t always have to be homogeneous, which makes them a useful tool in Python. Integers, Strings, and Objects are all DataTypes that can be combined into a single list. 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