{"id":2628,"date":"2023-10-16T15:35:37","date_gmt":"2023-10-16T10:05:37","guid":{"rendered":"https:\/\/python-programs.com\/?p=2628"},"modified":"2023-11-10T11:43:22","modified_gmt":"2023-11-10T06:13:22","slug":"python-how-to-find-all-indexes-of-an-item-in-a-list","status":"publish","type":"post","link":"https:\/\/python-programs.com\/python-how-to-find-all-indexes-of-an-item-in-a-list\/","title":{"rendered":"Python How to Find all Indexes of an Item in a List"},"content":{"rendered":"<p>Lists are similar to dynamically sized arrays, which are declared in other languages(e.g., vector in C++ and ArrayList in Java). Lists do not have to be homogeneous all of the time, which makes it a very useful tool in Python. DataTypes such as Integers, Strings, and Objects can all be included in a single list. Lists are mutable, which means they can be changed after they&#8217;ve been created.<\/p>\n<p>An index refers to a position within an list.<\/p>\n<p>Given a list and item, the task is to print all indexes of occurrences of that item in the list<\/p>\n<p><strong>Examples:<\/strong><\/p>\n<p><strong>Input :<\/strong><\/p>\n<pre id=\"c-60719d01142b3027475410-3\" class=\"c-line\"><span class=\"c-v\">givenlist<\/span>\u00a0<span class=\"c-o\">=<\/span> <span class=\"c-sy\">[\"this\"<\/span><span class=\"c-sy\">, \"is\"<\/span><span class=\"c-sy\">,<\/span> \"the\"<span class=\"c-sy\">,<\/span> \"new\"<span class=\"c-sy\">, \"way\"<\/span><span class=\"c-sy\">, \"to\" , \"learn\" , \"python\", \"which\" , \"is\" ,\"easy\" ,\"is\"<\/span>\u00a0<span class=\"c-sy\">]<\/span>\r\n\r\n<span class=\"c-h\">item<\/span>\u00a0<span class=\"c-o\">= is<\/span><\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre>Indexes are : 1 9 11<\/pre>\n<p><strong>Explanation:<\/strong><\/p>\n<pre>Here \"is\" is present at the indices 1,9 and 11<\/pre>\n<h2>Print the indices of occurrences of the item<\/h2>\n<p>There are several ways to find indices of item in list some of them are:<\/p>\n<ul>\n<li><a href=\"#Using_For_loop_and_list\">Using For loop and list<\/a><\/li>\n<li><a href=\"#Using_enumerate()_function\">Using enumerate() function<\/a><\/li>\n<li><a href=\"#Using_list_comprehension_and_range\">Using list comprehension and range<\/a><\/li>\n<li><a href=\"#Using_count()_function_in_itertools\">Using count() function in itertools<\/a><\/li>\n<li><a href=\"#Using_Numpy\">Using Numpy<\/a><\/li>\n<\/ul>\n<h3 id=\"Using_For_loop_and_list\">Method #1: Using For loop and list<\/h3>\n<p>Create an empty list. Iterate through each element in the original list using a for-loop.<\/p>\n<p>Append the index of each occurrence of the given item to the empty list.<\/p>\n<p>Below is the implementation:<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\"># Given list\r\ngivenlist = [\"this\", \"is\", \"the\", \"new\", \"way\", \"to\", \"learn\", \"python\",\r\n             \"which\", \"is\", \"easy\", \"is\"]\r\n\r\n# Given item\r\nitem = \"is\"\r\n\r\n# Taking empty list\r\nindexes = []\r\n\r\n# Loop over indices of elements in givenlist\r\nfor index in range(len(givenlist)):\r\n  # if element is equal to given item then append to empty list\r\n    if givenlist[index] == item:\r\n        indexes.append(index)\r\n\r\n# printing the result indexes\r\nprint(\"Indexes are : \", *indexes)\r\n<\/pre>\n<p>Note : Here * is used to print list with spaces<\/p>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">Indexes are :  1 9 11<\/pre>\n<h3 id=\"Using_enumerate()_function\">Method #2 : Using enumerate() function<\/h3>\n<p>The built-in function enumerate can be used to get the index of all occurrences of an element in a list ().<\/p>\n<p>It was created to solve the loop counter issue and can be used in these type of problems.<\/p>\n<p>Below is the implementation:<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\"># Given list\r\ngivenlist = [\"this\", \"is\", \"the\", \"new\", \"way\", \"to\", \"learn\", \"python\",\r\n             \"which\", \"is\", \"easy\", \"is\"]\r\n\r\n# Given item\r\nitem = \"is\"\r\n\r\nprint(\"Indexes are :\", end=\" \")\r\n\r\nfor index, element in enumerate(givenlist):\r\n    # If the element is equal to item then print its index\r\n    if element == item:\r\n        print(index, end=\" \")\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">Indexes are :  1 9 11<\/pre>\n<h3 id=\"Using_list_comprehension_and_range\">Method #3: Using list comprehension and range<\/h3>\n<p>You can get a list of all valid indices with the range() function and then compare the corresponding value<\/p>\n<p>at each index with the given object.<\/p>\n<p>Below is the implementation:<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\"># Given list\r\ngivenlist = [\"this\", \"is\", \"the\", \"new\", \"way\", \"to\", \"learn\", \"python\",\r\n             \"which\", \"is\", \"easy\", \"is\"]\r\n\r\n# Given item\r\nitem = \"is\"\r\n\r\nprint(\"Indexes are :\", end=\" \")\r\n# Using list comprehension to store indexes in indexes list\r\nindexes = [index for index in range(\r\n    len(givenlist)) if givenlist[index] == item]\r\n\r\n# print the list\r\nprint(*indexes)\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">Indexes are :  1 9 11<\/pre>\n<h3 id=\"Using_count()_function_in_itertools\">Method #4 : Using count() function in itertools<\/h3>\n<p>We can use itertools <strong>count()<\/strong> function to build an iterator for efficient looping that returns evenly<\/p>\n<p>spaced values beginning with the given amount.<\/p>\n<p>You may use it in conjunction with the zip() function to add sequence numbers as shown below.<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">from itertools import count\r\n# Given list\r\ngivenlist = [\"this\", \"is\", \"the\", \"new\", \"way\", \"to\", \"learn\", \"python\",\r\n             \"which\", \"is\", \"easy\", \"is\"]\r\n\r\n# Given item\r\nitem = \"is\"\r\n\r\nprint(\"Indexes are :\", end=\" \")\r\nindexes = [(i, j) for i, j in zip(count(), givenlist) if j == item]\r\n\r\n\r\n# Traverse the indexes list and print only index\r\nfor i in indexes:\r\n    print(i[0], end=\" \")\r\n<\/pre>\n<p>Note: Here we need only index so we print only index element in indexes list<\/p>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">Indexes are :  1 9 11<\/pre>\n<h3 id=\"Using_Numpy\">Method #5 : Using Numpy<\/h3>\n<p>We use numpy.where() function to get indexes of the occurrences of item in given list.<\/p>\n<p>Below is the implementation<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">import numpy as np\r\n# Given list\r\ngivenlist = [\"this\", \"is\", \"the\", \"new\", \"way\", \"to\", \"learn\", \"python\",\r\n             \"which\", \"is\", \"easy\", \"is\"]\r\n\r\n# Given item\r\nitem = \"is\"\r\n\r\nindexes = np.where(np.array(givenlist) == item)[0]\r\n\r\nprint(\"Indexes are :\",*indexes)<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">Indexes are :  1 9 11<\/pre>\n<p><strong>Related Programs<\/strong>:<\/p>\n<ul>\n<li><a href=\"https:\/\/python-programs.com\/python-how-to-create-a-list-of-all-the-keys-in-the-dictionary\/\">python how to create a list of all the keys in the dictionary<\/a><\/li>\n<li><a href=\"https:\/\/python-programs.com\/python-how-to-create-a-list-of-all-the-values-in-a-dictionary\/\">python how to create a list of all the values in a dictionary<\/a><\/li>\n<li><a href=\"https:\/\/python-programs.com\/python-how-to-get-the-list-of-all-files-in-a-zip-archive\/\">python how to get the list of all files in a zip archive<\/a><\/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<\/a><\/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<\/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\/python-how-to-sort-a-list-of-tuples-by-second-item\/\">python how to sort a list of tuples by second item<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Lists are similar to dynamically sized arrays, which are declared in other languages(e.g., vector in C++ and ArrayList in Java). Lists do not have to be homogeneous all of the time, which makes it a very useful tool in Python. DataTypes such as Integers, Strings, and Objects can all be included in a single list. &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/python-programs.com\/python-how-to-find-all-indexes-of-an-item-in-a-list\/\"> <span class=\"screen-reader-text\">Python How to Find all Indexes of an Item in a List<\/span> Read More &raquo;<\/a><\/p>\n","protected":false},"author":7,"featured_media":6768,"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 Find all Indexes of an Item 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-how-to-find-all-indexes-of-an-item-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 How to Find all Indexes of an Item in a List - Python Programs\" \/>\n<meta property=\"og:description\" content=\"Lists are similar to dynamically sized arrays, which are declared in other languages(e.g., vector in C++ and ArrayList in Java). 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Lists do not have to be homogeneous all of the time, which makes it a very useful tool in Python. 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