{"id":4688,"date":"2023-10-25T12:23:55","date_gmt":"2023-10-25T06:53:55","guid":{"rendered":"https:\/\/python-programs.com\/?p=4688"},"modified":"2023-11-10T11:58:09","modified_gmt":"2023-11-10T06:28:09","slug":"python-find-duplicates-in-a-list-with-frequency-count-and-index-positions","status":"publish","type":"post","link":"https:\/\/python-programs.com\/python-find-duplicates-in-a-list-with-frequency-count-and-index-positions\/","title":{"rendered":"Python: Find Duplicates in a list with Frequency Count and index positions"},"content":{"rendered":"<p>A collection is an ordered list of values. There could be various types of values. A list is a mutable container. This means that existing ones can be added to, deleted from, or changed.<\/p>\n<p>The Python list represents the mathematical concept of a finite sequence. List values are referred to as list items or list elements. The same value may appear multiple times in a list. Each event is regarded as a distinct element.<\/p>\n<p>Given a list, the task is to find Duplicate elements in a list with their respective frequencies and index positions.<\/p>\n<p><strong>Example:<\/strong><\/p>\n<p><strong>I)Without indices<\/strong><\/p>\n<p><strong>Input:<\/strong><\/p>\n<pre>givenlist = [1, 2, 3, 1, 2, 1, 5, 6, 7, 8, 9]<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">element = 1 frequency : 3\r\nelement = 2 frequency : 2<\/pre>\n<p><strong>II)With Indices<\/strong><\/p>\n<p><strong>Input:<\/strong><\/p>\n<pre>givenlist = [1, 2, 3, 1, 2, 1, 5, 6, 7, 8, 9]<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">element = 1 frequency : 3 indices : [0, 3, 5]\r\nelement = 2 frequency : 2 indices : [1, 4]<\/pre>\n<h2>Find Duplicates in a list<\/h2>\n<p>There are several ways to find duplicates in a list some of them are:<\/p>\n<ul>\n<li><a href=\"#Using_set_method\">Using set method<\/a><\/li>\n<li><a href=\"#Using_dictionary\">Using dictionary<\/a><\/li>\n<li><a href=\"#Using_Counter()_function\">Using Counter() function<\/a><\/li>\n<li><a href=\"#Finding_indices_and_frequency_of_duplicate_elements\">Finding indices and frequency of duplicate elements<\/a><\/li>\n<\/ul>\n<h3 id=\"Using_set_method\">Method #1:Using set method<\/h3>\n<ul>\n<li>Remove all duplicates from the list by converting it to a set.<\/li>\n<li>Now, traverse the set and use the count() function to determine the frequency of each element.<\/li>\n<li>If the frequency is greater than 1 then print the element and frequency<\/li>\n<\/ul>\n<p><strong>Below is the implementation:<\/strong><\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\"># givenlist\r\ngivenlist = [1, 2, 3, 1, 2, 1, 5, 6, 7, 8, 9]\r\n# converting givenlist to set\r\nsetlist = set(givenlist)\r\n# Traverse the set\r\nfor element in setlist:\r\n    # counting the frequency of element if it is greater than 1 then print it\r\n    frequency = givenlist.count(element)\r\n    if(frequency &gt; 1):\r\n        # print the element and frequency\r\n        print('element =', element, 'frequency :', frequency)\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">element = 1 frequency : 3\r\nelement = 2 frequency : 2<\/pre>\n<p><strong>Time Complexity: O(n^2)<\/strong><\/p>\n<h3 id=\"Using_dictionary\">Method #2:Using dictionary<\/h3>\n<p>We&#8217;ll write a function that takes a list and prints the duplicate elements in that list, as well as their frequency counts.<\/p>\n<p><strong>Approach:<\/strong><\/p>\n<ul>\n<li>This function produces a new dictionary when it is called. The program\u00a0then goes through each element in the provided list one by one. It examines each variable to see if it is present in the dictionary keys.<\/li>\n<li>If the element does not appear in the dictionary keys, it is added to the dictionary as a key with the value of 1.<br \/>\nIf the element is present in dictionary keys, the value of that key is increased by one.<\/li>\n<li>Traverse the dictionary<\/li>\n<li>If the frequency is greater than 1 then print the element and frequency<\/li>\n<\/ul>\n<p><strong>Below is the implementation:<\/strong><\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\"># function which print the duplicates\r\ndef printDuplicates(givenlist):\r\n    # taking a empty dictionary\r\n    freq = {}\r\n    # Traverse the list\r\n    for element in givenlist:\r\n        # if the element is in freq dictionary then add its count\r\n        if element in freq.keys():\r\n            freq[element] += 1\r\n        else:\r\n            freq[element] = 1\r\n\r\n    # Traverse the freq dictionary and print the duplicate elements and frequency\r\n    for key in freq:\r\n        # if value\/count is greater than 1 the print it\r\n        if(freq[key] &gt; 1):\r\n            print('element =', key, 'frequency :', freq[key])\r\n\r\n\r\n# givenlist\r\ngivenlist = [1, 2, 3, 1, 2, 1, 5, 6, 7, 8, 9]\r\n# passing list to printDuplicates function\r\nprintDuplicates(givenlist)\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">element = 1 frequency : 3\r\nelement = 2 frequency : 2<\/pre>\n<p><strong>Time Complexity: O(n)<\/strong><\/p>\n<h3 id=\"Using_Counter()_function\">Method #3:Using Counter() function<\/h3>\n<p>We can use an iterable or any dict like mapping to construct a Counter class object. This Counter object keeps track of how many times each variable in the iterable has been counted. Let&#8217;s use the Counter object to locate and count duplicates in a list.<\/p>\n<p>This function is similar to first two points in method 2<\/p>\n<p><strong>Below is the implementation:<\/strong><\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">from collections import Counter\r\n# function which print the duplicates\r\n\r\n\r\ndef printDuplicates(givenlist):\r\n    # using Counter function to calculate frequencies\r\n    freq = Counter(givenlist)\r\n\r\n    # Traverse the freq dictionary and print the duplicate elements and frequency\r\n    for key in freq:\r\n        # if value\/count is greater than 1 the print it\r\n        if(freq[key] &gt; 1):\r\n            print('element =', key, 'frequency :', freq[key])\r\n\r\n\r\n# givenlist\r\ngivenlist = [1, 2, 3, 1, 2, 1, 5, 6, 7, 8, 9]\r\n# passing list to printDuplicates function\r\nprintDuplicates(givenlist)\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">element = 1 frequency : 3\r\nelement = 2 frequency : 2<\/pre>\n<p><strong>Time Complexity: O(n)<\/strong><\/p>\n<h3 id=\"Finding_indices_and_frequency_of_duplicate_elements\">Method #4:Finding indices and frequency of duplicate elements<\/h3>\n<p><strong>Approach:<\/strong><\/p>\n<ul>\n<li>let us take starting index as 0<\/li>\n<li>This function produces a new dictionary when it is called. The program\u00a0then goes through each element in the provided list one by one. It examines each variable to see if it is present in the dictionary keys.<\/li>\n<li>Then iterates through each element in the list one by one, keeping track of the index positions.<\/li>\n<li>Then, for each element, it checks to see if it already exists in the dictionary keys.<\/li>\n<li>If it doesn&#8217;t, it creates a new key-value pair in the dictionary, with the element as the key and a list object of two items as the value. 1)count as 1 2) index list with current index position<\/li>\n<li>If the element is found in the dictionary keys, the frequency count in the value field is increased, and the index location in the index list is added.<\/li>\n<li>Increment the index by 1 for every iteration<\/li>\n<li>Traverse the dictionary<\/li>\n<li>If the frequency is greater than 1 then print the element and frequency and indices<\/li>\n<\/ul>\n<p><strong>Below is the implementation:<\/strong><\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">def printDuplicates(givenlist):\r\n    # taking a empty dictionary\r\n    freq = {}\r\n    # taking index =0\r\n    index = 0\r\n    # Traverse the list\r\n    for element in givenlist:\r\n        # if the element is in freq dictionary then add its count and index\r\n        if element in freq.keys():\r\n            freq[element][0] += 1\r\n            freq[element][1].append(index)\r\n        else:\r\n            freq[element] = [1, [index]]\r\n        # increment the index\r\n        index += 1\r\n\r\n    # Traverse the freq dictionary and print the duplicate elements and frequency\r\n    for key in freq:\r\n        # if value\/count is greater than 1 the print it\r\n        if(freq[key][0] &gt; 1):\r\n            print('element =', key, 'frequency :',\r\n                  freq[key][0], 'indices :', freq[key][1])\r\n\r\n\r\n# givenlist\r\ngivenlist = [1, 2, 3, 1, 2, 1, 5, 6, 7, 8, 9]\r\n# passing list to printDuplicates function\r\nprintDuplicates(givenlist)\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">element = 1 frequency : 3 indices : [0, 3, 5]\r\nelement = 2 frequency : 2 indices : [1, 4]<\/pre>\n<p><strong>Time Complexity: O(n)<\/strong><\/p>\n<p>&nbsp;<br \/>\n<strong>Related Programs<\/strong>:<\/p>\n<ul>\n<li><a href=\"https:\/\/python-programs.com\/count-occurrences-of-a-single-or-multiple-characters-in-string-and-find-their-index-positions\/\">count occurrences of a single or multiple characters in string and find their index positions<\/li>\n<li><a href=\"https:\/\/python-programs.com\/python-find-unique-values-in-a-numpy-array-with-frequency-and-indices\/\">python find unique values in a numpy array with frequency and indices<\/li>\n<li><a href=\"https:\/\/python-programs.com\/find-frequency-of-each-character-in-string-and-their-indices-and-finding-duplicate-characters-in-a-string\/\">find frequency of each character in string and their indices and finding duplicate characters in a string<\/li>\n<li><a href=\"https:\/\/python-programs.com\/python-program-to-find-the-minimum-index-of-a-repeating-element-in-an-array-list\/\">python program to find the minimum index of a repeating element in an array list<\/li>\n<li><a href=\"https:\/\/python-programs.com\/python-program-to-find-a-pair-with-a-minimum-absolute-sum-in-an-list\/\">python program to find a pair with a minimum absolute sum in an list<\/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-find-all-indexes-of-an-item-in-a-list\/\">python how to find all indexes of an item in a list<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>A collection is an ordered list of values. There could be various types of values. A list is a mutable container. This means that existing ones can be added to, deleted from, or changed. The Python list represents the mathematical concept of a finite sequence. List values are referred to as list items or list &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/python-programs.com\/python-find-duplicates-in-a-list-with-frequency-count-and-index-positions\/\"> <span class=\"screen-reader-text\">Python: Find Duplicates in a list with Frequency Count and index positions<\/span> Read More &raquo;<\/a><\/p>\n","protected":false},"author":7,"featured_media":4929,"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: Find Duplicates in a list with Frequency Count and index positions - 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-find-duplicates-in-a-list-with-frequency-count-and-index-positions\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Python: Find Duplicates in a list with Frequency Count and index positions - Python Programs\" \/>\n<meta property=\"og:description\" content=\"A collection is an ordered list of values. 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There could be various types of values. A list is a mutable container. This means that existing ones can be added to, deleted from, or changed. The Python list represents the mathematical concept of a finite sequence. 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