{"id":20663,"date":"2021-09-21T08:59:53","date_gmt":"2021-09-21T03:29:53","guid":{"rendered":"https:\/\/python-programs.com\/?p=20663"},"modified":"2021-11-22T18:36:17","modified_gmt":"2021-11-22T13:06:17","slug":"python-program-for-array-list-elements-that-appear-more-than-once","status":"publish","type":"post","link":"https:\/\/python-programs.com\/python-program-for-array-list-elements-that-appear-more-than-once\/","title":{"rendered":"Python Program for Array\/List Elements that Appear More than Once"},"content":{"rendered":"<p>In the previous article, we have discussed <a href=\"https:\/\/python-programs.com\/python-program-to-remove-elements-from-the-array-list-which-occurs-more-than-k-times\/\">Python Program to Remove Elements from the Array\/List Which Occurs More than k Times<\/a><\/p>\n<p>Given a list, and the task is to print all the elements from a given list that appears more than once in python.<\/p>\n<p><strong>Examples:<\/strong><\/p>\n<p><strong>Example1:<\/strong><\/p>\n<p><strong>Input:<\/strong><\/p>\n<pre>Given List = [20, 30, 40, 50, 20, 50]<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">The Elements from a given list [20, 30, 40, 50, 20, 50] that appears more than once : \r\n20 50<\/pre>\n<p><strong>Example2:<\/strong><\/p>\n<p><strong>Input:<\/strong><\/p>\n<pre>Given List = [15, 25, 35, 25, 15, 40]<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">The Elements from a given list [15, 25, 35, 25, 15, 40] that appears more than once : \r\n15 25<\/pre>\n<h2>Program for Array\/List Elements that Appear More than Once in Python<\/h2>\n<p>Below are the ways to print all the elements from a given list that appears more than once in python:<\/p>\n<ul>\n<li><a href=\"#Using_Dictionary_(Hashing,_User_Input)\">Using Dictionary (Hashing, User Input)<\/a><\/li>\n<li><a href=\"#Using_Counter()_function_(Hashing,_Static_Input)\">Using Counter() function (Hashing, Static Input)<\/a><\/li>\n<li><a href=\"#Using_Counter()_function_(Hashing,_User_Input)\">Using Counter() function (Hashing, User Input)<\/a><\/li>\n<li><a href=\"#Using_Counter()_function_(Hashing,_User_Input)\">Using Counter() function (Hashing, User Input)<\/a><\/li>\n<\/ul>\n<h3 id=\"Using_Dictionary_(Hashing,_User_Input)\">Method #1: Using Dictionary (Hashing, Static Input)<\/h3>\n<p><strong>Approach:<\/strong><\/p>\n<ul>\n<li>Take a dictionary and initialize it to empty using the {} or dict() say <strong>freqncyDictionary<\/strong>.<\/li>\n<li>Give the list as static input and store it in a variable.<\/li>\n<li>Loop in the given list using the For loop.<\/li>\n<li>Inside the For loop, Check if the list element is present in the dictionary or not using the if conditional statement and &#8216;<strong>in<\/strong>&#8216; keyword.<\/li>\n<li>If it is true then increment the count of the list element in the dictionary by 1.<\/li>\n<li>Else initialize the dictionary with the list element as key and value as 1.<\/li>\n<li>Take a new empty list say <strong>modifdlst<\/strong> and store it in a variable.<\/li>\n<li>Loop in the above-calculated frequency dictionary using the For loop<\/li>\n<li>Check if the key in the freqncyDictionary having a value greater than 1 using the if conditional statement.<\/li>\n<li>If it is true then append the key value to the above declared empty list <strong>modifdlst.<\/strong><\/li>\n<li>Print all the elements from a given list that appears more than once.<\/li>\n<li>The Exit of the Program.<\/li>\n<\/ul>\n<div class=\"\">\n<p><strong>Below is the implementation:<\/strong><\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\"># Take a dictionary and initialize it to empty\r\n# using the {} or dict() say freqncyDictionary.\r\nfreqncyDictionary = {}\r\n# Give the list as static input and store it in a variable.\r\ngvnlst = [20, 30, 40, 50, 20, 50]\r\n# Loop in the given list using the For loop.\r\nfor i in gvnlst:\r\n        # Inside the For loop,\r\n    # Check if the list element is present in the dictionary\r\n    # or not using the if conditional statement and 'in' keyword.\r\n    if i in freqncyDictionary.keys():\r\n                # If it is true then increment the count of the list element\r\n        # in the dictionary by 1.\r\n        freqncyDictionary[i] = freqncyDictionary[i]+1\r\n    # Else initialize the dictionary with the list element as key and value as 1.\r\n    else:\r\n        freqncyDictionary[i] = 1\r\n# Take a new empty list say modifdlst and store it in a variable.\r\nmodifdlst = []\r\n# Loop in the above calculated frequency dictionary using the For loop\r\nfor key in freqncyDictionary:\r\n  # Check if the key in the freqncyDictionary having value greater than 1\r\n  # using the if conditional statement.\r\n\r\n    if(freqncyDictionary[key] &gt; 1):\r\n      # If it is true then append the key value to the above declared empty list modifdlst.\r\n        modifdlst.append(key)\r\n# Print all the elements from a given list that appears more than once.\r\nprint(\"The Elements from a given list\", gvnlst,\r\n      \"that appears more than once : \")\r\nprint(*modifdlst)\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">The Elements from a given list [20, 30, 40, 50, 20, 50] that appears more than once : \r\n20 50<\/pre>\n<\/div>\n<h3 id=\"Using_Counter()_function_(Hashing,_Static_Input)\">Method #2: Using Dictionary (Hashing, User Input)<\/h3>\n<p><strong>Approach:<\/strong><\/p>\n<ul>\n<li>Take a dictionary and initialize it to empty using the {} or dict() say <strong>freqncyDictionary<\/strong>.<\/li>\n<li>Give the list as user input using the list(),map(),split(),int functions and store it in a variable.<\/li>\n<li>Loop in the given list using the For loop.<\/li>\n<li>Inside the For loop, Check if the list element is present in the dictionary or not using the if conditional statement and &#8216;<strong>in<\/strong>&#8216; keyword.<\/li>\n<li>If it is true then increment the count of the list element in the dictionary by 1.<\/li>\n<li>Else initialize the dictionary with the list element as key and value as 1.<\/li>\n<li>Take a new empty list say <strong>modifdlst<\/strong> and store it in a variable.<\/li>\n<li>Loop in the above-calculated frequency dictionary using the For loop<\/li>\n<li>Check if the key in the freqncyDictionary having a value greater than 1 using the if conditional statement.<\/li>\n<li>If it is true then append the key value to the above declared empty list <strong>modifdlst.<\/strong><\/li>\n<li>Print all the elements from a given list that appears more than once.<\/li>\n<li>The Exit of the Program.<\/li>\n<\/ul>\n<p><strong>Below is the implementation:<\/strong><\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\"># Take a dictionary and initialize it to empty\r\n# using the {} or dict() say freqncyDictionary.\r\nfreqncyDictionary = {}\r\n# Give the list as user input using the list(),map(),split(),int functions\r\n# and store it in a variable.\r\ngvnlst = list(\r\n    map(int, input('Enter some random list element separated by spaces = ').split()))\r\n# Loop in the given list using the For loop.\r\nfor i in gvnlst:\r\n        # Inside the For loop,\r\n    # Check if the list element is present in the dictionary\r\n    # or not using the if conditional statement and 'in' keyword.\r\n    if i in freqncyDictionary.keys():\r\n                # If it is true then increment the count of the list element\r\n        # in the dictionary by 1.\r\n        freqncyDictionary[i] = freqncyDictionary[i]+1\r\n    # Else initialize the dictionary with the list element as key and value as 1.\r\n    else:\r\n        freqncyDictionary[i] = 1\r\n# Take a new empty list say modifdlst and store it in a variable.\r\nmodifdlst = []\r\n# Loop in the above calculated frequency dictionary using the For loop\r\nfor key in freqncyDictionary:\r\n  # Check if the key in the freqncyDictionary having value greater than 1\r\n  # using the if conditional statement.\r\n\r\n    if(freqncyDictionary[key] &gt; 1):\r\n      # If it is true then append the key value to the above declared empty list modifdlst.\r\n        modifdlst.append(key)\r\n# Print all the elements from a given list that appears more than once.\r\nprint(\"The Elements from a given list\", gvnlst,\r\n      \"that appears more than once : \")\r\nprint(*modifdlst)\r\n\r\n\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">Enter some random list element separated by spaces = 15 25 35 25 15 40\r\nThe Elements from a given list [15, 25, 35, 25, 15, 40] that appears more than once : \r\n15 25<\/pre>\n<h3 id=\"Using_Counter()_function_(Hashing,_User_Input)\">Method #3: Using Counter() function (Hashing, Static Input)<\/h3>\n<p><strong>Approach:<\/strong><\/p>\n<ul>\n<li>Import the Counter() function from collections using the import keyword.<\/li>\n<li>Give the list as static input and store it in a variable.<\/li>\n<li>Calculate the frequency of all the given list elements using the Counter() function which returns the element and its frequency as key-value pair and store this dictionary in a variable(say <strong>freqncyDictionary<\/strong>)<\/li>\n<li>Take a new empty list say <strong>modifdlst<\/strong> and store it in a variable.<\/li>\n<li>Loop in the above-calculated frequency dictionary using the For loop<\/li>\n<li>Check if the key in the freqncyDictionary having a value greater than 1 using the if conditional statement.<\/li>\n<li>If it is true then append the key value to the above declared empty list <strong>modifdlst.<\/strong><\/li>\n<li>Print all the elements from a given list that appears more than once.<\/li>\n<li>The Exit of the Program.<\/li>\n<\/ul>\n<p><strong>Below is the implementation:<\/strong><\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\"># Import the Counter() function from collections using the import keyword.\r\nfrom collections import Counter\r\n# Give the list as static input and store it in a variable.\r\ngvnlst = [20, 30, 40, 50, 20, 50]\r\n# Calculate the frequency of all the given list elements using the Counter()\r\n# function which returns the element and its frequency as key-value pair\r\n# and store this dictionary in a variable(say freqncyDictionary)\r\nfreqncyDictionary = Counter(gvnlst)\r\n# Take a new empty list say modifdlst and store it in a variable.\r\nmodifdlst = []\r\n# Loop in the above calculated frequency dictionary using the For loop\r\nfor key in freqncyDictionary:\r\n  # Check if the key in the freqncyDictionary having value greater than 1\r\n  # using the if conditional statement.\r\n\r\n    if(freqncyDictionary[key] &gt; 1):\r\n      # If it is true then append the key value to the above declared empty list modifdlst.\r\n        modifdlst.append(key)\r\n# Print all the elements from a given list that appears more than once.\r\nprint(\"The Elements from a given list\", gvnlst,\r\n      \"that appears more than once : \")\r\nprint(*modifdlst)\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">The Elements from a given list [20, 30, 40, 50, 20, 50] that appears more than once : \r\n20 50<\/pre>\n<h3 id=\"Using_Counter()_function_(Hashing,_User_Input)\">Method #4: Using Counter() function (Hashing, User Input)<\/h3>\n<p><strong>Approach:<\/strong><\/p>\n<ul>\n<li>Import the Counter() function from collections using the import keyword.<\/li>\n<li>Give the list as user input using the list(),map(),split(),int functions and store it in a variable.<\/li>\n<li>Calculate the frequency of all the given list elements using the Counter() function which returns the element and its frequency as key-value pair and store this dictionary in a variable(say <strong>freqncyDictionary<\/strong>)<\/li>\n<li>Take a new empty list say <strong>modifdlst<\/strong> and store it in a variable.<\/li>\n<li>Loop in the above-calculated frequency dictionary using the For loop<\/li>\n<li>Check if the key in the freqncyDictionary having a value greater than 1 using the if conditional statement.<\/li>\n<li>If it is true then append the key value to the above declared empty list <strong>modifdlst.<\/strong><\/li>\n<li>Print all the elements from a given list that appears more than once.<\/li>\n<li>The Exit of the Program.<\/li>\n<\/ul>\n<p><strong>Below is the implementation:<\/strong><\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\"># Import the Counter() function from collections using the import keyword.\r\nfrom collections import Counter\r\n# Give the list as user input using the list(),map(),split(),int functions\r\n# and store it in a variable.\r\ngvnlst = list(\r\n    map(int, input('Enter some random list element separated by spaces = ').split()))\r\n# Calculate the frequency of all the given list elements using the Counter()\r\n# function which returns the element and its frequency as key-value pair\r\n# and store this dictionary in a variable(say freqncyDictionary)\r\nfreqncyDictionary = Counter(gvnlst)\r\n# Take a new empty list say modifdlst and store it in a variable.\r\nmodifdlst = []\r\n# Loop in the above calculated frequency dictionary using the For loop\r\nfor key in freqncyDictionary:\r\n  # Check if the key in the freqncyDictionary having value greater than 1\r\n  # using the if conditional statement.\r\n\r\n    if(freqncyDictionary[key] &gt; 1):\r\n      # If it is true then append the key value to the above declared empty list modifdlst.\r\n        modifdlst.append(key)\r\n# Print all the elements from a given list that appears more than once.\r\nprint(\"The Elements from a given list\", gvnlst,\r\n      \"that appears more than once : \")\r\nprint(*modifdlst)\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre>Enter some random list element separated by spaces = 1 2 4 4 2 3 6 1\r\nThe Elements from a given list [1, 2, 4, 4, 2, 3, 6, 1] that appears more than once : \r\n1 2 4<\/pre>\n<p>Access the big list of <a href=\"https:\/\/python-programs.com\/python-programming-examples-with-output\/\">Python Programming Code Examples<\/a> with actual logical code asked in Programming and Coding Interviews for Python and stand out from the crowd.<\/p>\n<ul>\n<li><a href=\"https:\/\/python-programs.com\/python-program-to-delete-all-odd-frequency-elements-from-an-array-list\/\">Python Program to Delete All Odd Frequency Elements from an Array\/List<\/a><\/li>\n<li><a href=\"https:\/\/python-programs.com\/python-program-to-remove-characters-that-appear-more-than-k-times\/\">Python Program to Remove Characters that Appear More than k Times<\/a><\/li>\n<li><a href=\"https:\/\/python-programs.com\/python-program-to-remove-elements-from-the-array-list-which-occurs-more-than-k-times\/\">Python Program to Remove Elements from the Array\/List Which Occurs More than k Times<\/a><\/li>\n<li><a href=\"https:\/\/python-programs.com\/python-program-to-remove-string-elements-that-appear-strictly-less-than-k-times\/\">Python Program to Remove String Elements that Appear Strictly Less than k Times<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>In the previous article, we have discussed Python Program to Remove Elements from the Array\/List Which Occurs More than k Times Given a list, and the task is to print all the elements from a given list that appears more than once in python. Examples: Example1: Input: Given List = [20, 30, 40, 50, 20, &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/python-programs.com\/python-program-for-array-list-elements-that-appear-more-than-once\/\"> <span class=\"screen-reader-text\">Python Program for Array\/List Elements that Appear More than Once<\/span> Read More &raquo;<\/a><\/p>\n","protected":false},"author":7,"featured_media":20695,"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 Program for Array\/List Elements that Appear More than Once - 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-program-for-array-list-elements-that-appear-more-than-once\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Python Program for Array\/List Elements that Appear More than Once - Python Programs\" \/>\n<meta property=\"og:description\" content=\"In the previous article, we have discussed Python Program to Remove Elements from the Array\/List Which Occurs More than k Times Given a list, and the task is to print all the elements from a given list that appears more than once in python. 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