{"id":20649,"date":"2021-09-21T08:59:31","date_gmt":"2021-09-21T03:29:31","guid":{"rendered":"https:\/\/python-programs.com\/?p=20649"},"modified":"2021-11-22T18:36:17","modified_gmt":"2021-11-22T13:06:17","slug":"python-program-to-delete-all-odd-frequency-elements-from-an-array-list","status":"publish","type":"post","link":"https:\/\/python-programs.com\/python-program-to-delete-all-odd-frequency-elements-from-an-array-list\/","title":{"rendered":"Python Program to Delete All Odd Frequency Elements from an Array\/List"},"content":{"rendered":"<p>In the previous article, we have discussed <a href=\"https:\/\/python-programs.com\/python-program-to-remove-even-frequency-characters-from-the-string\/\">Python Program to Remove Even Frequency Characters from the String<\/a><\/p>\n<p>Given a list and the task is to delete all the elements from a given list that has an odd frequency.<\/p>\n<p><strong>Examples:<\/strong><\/p>\n<p><strong>Example1:<\/strong><\/p>\n<p><strong>Input:<\/strong><\/p>\n<pre>Given List = [10, 4, 2, 10, 1, 2, 3, 4, 5, 6, 6]<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">The list after deletion of all the elements from a given list that has an odd frequency : [10, 4, 2, 10, 2, 4, 6, 6]<\/pre>\n<p><strong>Example2:<\/strong><\/p>\n<p><strong>Input:<\/strong><\/p>\n<pre>Given List = [1, 6, 8, 2, 1, 7, 6, 8]<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre>The list after deletion of all the elements from a given list that has an odd frequency : [1, 6, 8, 1, 6, 8]<\/pre>\n<h2>Program to Delete All Odd Frequency Elements from an Array\/List in Python<\/h2>\n<p>Below are the ways to delete all the elements from a given list that has an odd frequency:<\/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 given list using the For loop.<\/li>\n<li>Check if the key in the freqncyDictionary having value even 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 the list after deletion of all the elements from a given list that has an odd frequency.<\/li>\n<li>The Exit of the Program.<\/li>\n<\/ul>\n<div class=\"\">\n<div>\n<p><strong><strong>Below is the implementation:<\/strong><\/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 = [10, 4, 2, 10, 1, 2, 3, 4, 5, 6, 6]\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 given list using the For loop.\r\nfor lstelmt in gvnlst:\r\n  # Check if the key in the freqncyDictionary having value even using the if conditional\r\n  # statement.\r\n    if(freqncyDictionary[lstelmt] % 2 == 0):\r\n      # If it is true then append the key value to the above declared empty list modifdlst.\r\n        modifdlst.append(lstelmt)\r\n# Print the list after deletion of all the elements from a given list that has an odd\r\n# frequency.\r\nprint(\"The list after deletion of all the elements from a given list that has an odd frequency :\", modifdlst)\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">The list after deletion of all the elements from a given list that has an odd frequency : [10, 4, 2, 10, 2, 4, 6, 6]<\/pre>\n<\/div>\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 given list using the For loop.<\/li>\n<li>Check if the key in the freqncyDictionary having value even 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 the list after deletion of all the elements from a given list that has an odd frequency.<\/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 given list using the For loop.\r\nfor lstelmt in gvnlst:\r\n  # Check if the key in the freqncyDictionary having value even using the if conditional\r\n  # statement.\r\n    if(freqncyDictionary[lstelmt] % 2 == 0):\r\n      # If it is true then append the key value to the above declared empty list modifdlst.\r\n        modifdlst.append(lstelmt)\r\n# Print the list after deletion of all the elements from a given list that has an odd\r\n# frequency.\r\nprint(\"The list after deletion of all the elements from a given list that has an odd frequency :\", modifdlst)\r\n\r\n\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre>Enter some random list element separated by spaces = 1 6 8 2 1 7 6 8\r\nThe list after deletion of all the elements from a given list that has an odd frequency : [1, 6, 8, 1, 6, 8]<\/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 given list using the For loop.<\/li>\n<li>Check if the key in the freqncyDictionary having value even 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 the list after deletion of all the elements from a given list that has an odd frequency.<\/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 = [10, 4, 2, 10, 1, 2, 3, 4, 5, 6, 6]\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 given list using the For loop.\r\nfor lstelmt in gvnlst:\r\n  # Check if the key in the freqncyDictionary having value even using the if conditional\r\n  # statement.\r\n    if(freqncyDictionary[lstelmt] % 2 == 0):\r\n      # If it is true then append the key value to the above declared empty list modifdlst.\r\n        modifdlst.append(lstelmt)\r\n# Print the list after deletion of all the elements from a given list that has an odd\r\n# frequency.\r\nprint(\"The list after deletion of all the elements from a given list that has an odd frequency :\", modifdlst)\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">The list after deletion of all the elements from a given list that has an odd frequency : [10, 4, 2, 10, 2, 4, 6, 6]<\/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 given list using the For loop.<\/li>\n<li>Check if the key in the freqncyDictionary having value even 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 the list after deletion of all the elements from a given list that has an odd frequency.<\/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 given list using the For loop.\r\nfor lstelmt in gvnlst:\r\n  # Check if the key in the freqncyDictionary having value even using the if conditional\r\n  # statement.\r\n    if(freqncyDictionary[lstelmt] % 2 == 0):\r\n      # If it is true then append the key value to the above declared empty list modifdlst.\r\n        modifdlst.append(lstelmt)\r\n# Print the list after deletion of all the elements from a given list that has an odd\r\n# frequency.\r\nprint(\"The list after deletion of all the elements from a given list that has an odd frequency :\", modifdlst)\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre>Enter some random list element separated by spaces = 3 6 2 1 8 3 6 8 \r\nThe list after deletion of all the elements from a given list that has an odd frequency : [3, 6, 8, 3, 6, 8]\r\n<\/pre>\n<p>If you are new to the Python Programming Language then practice using our <a href=\"https:\/\/python-programs.com\/python-programming-examples-with-output\/\">Python Programming Examples for Beginners<\/a> as our expert team has designed them from scratch.<\/p>\n<ul>\n<li><a href=\"https:\/\/python-programs.com\/python-program-to-check-whether-string-contains-unique-characters\/\">Python Program to Check whether String Contains Unique Characters<\/a><\/li>\n<li><a href=\"https:\/\/python-programs.com\/python-program-to-find-all-non-repeated-characters-in-a-string\/\"><span data-sheets-value=\"{&quot;1&quot;:2,&quot;2&quot;:&quot; Program to Find All Non Repeated Characters in a String&quot;}\" data-sheets-userformat=\"{&quot;2&quot;:513,&quot;3&quot;:{&quot;1&quot;:0},&quot;12&quot;:0}\"> Program to Find All Non Repeated Characters in a String<\/span><\/a><\/li>\n<li><a href=\"https:\/\/python-programs.com\/python-program-to-find-the-sum-of-all-odd-frequency-elements-in-an-array-list\/\"><span data-sheets-value=\"{&quot;1&quot;:2,&quot;2&quot;:&quot;Python Program to Find the Sum of all Odd Frequency Elements in an Array\/List&quot;}\" data-sheets-userformat=\"{&quot;2&quot;:4224,&quot;10&quot;:2,&quot;15&quot;:&quot;Arial&quot;}\">Python Program to Find the Sum of all Odd Frequency Elements in an Array\/List<\/span><\/a><\/li>\n<li><a href=\"https:\/\/python-programs.com\/python-program-to-remove-odd-occurring-characters-from-the-string\/\">Python Program to Remove Odd Occurring Characters from the String<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>In the previous article, we have discussed Python Program to Remove Even Frequency Characters from the String Given a list and the task is to delete all the elements from a given list that has an odd frequency. Examples: Example1: Input: Given List = [10, 4, 2, 10, 1, 2, 3, 4, 5, 6, 6] &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/python-programs.com\/python-program-to-delete-all-odd-frequency-elements-from-an-array-list\/\"> <span class=\"screen-reader-text\">Python Program to Delete All Odd Frequency Elements from an Array\/List<\/span> Read More &raquo;<\/a><\/p>\n","protected":false},"author":7,"featured_media":20696,"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 to Delete All Odd Frequency Elements from an Array\/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-program-to-delete-all-odd-frequency-elements-from-an-array-list\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Python Program to Delete All Odd Frequency Elements from an Array\/List - Python Programs\" \/>\n<meta property=\"og:description\" content=\"In the previous article, we have discussed Python Program to Remove Even Frequency Characters from the String Given a list and the task is to delete all the elements from a given list that has an odd frequency. 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