{"id":24815,"date":"2021-11-02T09:48:05","date_gmt":"2021-11-02T04:18:05","guid":{"rendered":"https:\/\/python-programs.com\/?p=24815"},"modified":"2021-11-05T20:37:04","modified_gmt":"2021-11-05T15:07:04","slug":"python-filter-function-with-examples","status":"publish","type":"post","link":"https:\/\/python-programs.com\/python-filter-function-with-examples\/","title":{"rendered":"Python filter() Function with Examples"},"content":{"rendered":"<p>In the previous article, we have discussed <a href=\"https:\/\/python-programs.com\/python-enumerate-function-with-examples\/\">Python enumerate() Function with Examples<\/a><br \/>\n<strong>filter() Function in Python:<\/strong><\/p>\n<p>The filter() function returns an iterator in which the items are filtered through a function to determine whether or not the item is accepted.<\/p>\n<p><strong>Syntax:<\/strong><\/p>\n<pre>filter(function, iterable)<\/pre>\n<p><strong>Parameter Values:<\/strong><\/p>\n<p><strong>function:<\/strong> It is a function that will be executed for each item in the iterable.<\/p>\n<p><strong>iterable:<\/strong> The iterable that will be filtered.<\/p>\n<p><strong>Return Value:<\/strong><\/p>\n<p>The iterator is returned by the filter() function.<\/p>\n<p><strong>Examples:<\/strong><\/p>\n<p><strong>Example1:<\/strong><\/p>\n<p><strong>Input:<\/strong><\/p>\n<pre>Given List = [3, 10, 12, 13, 20, 7, 1, 16]<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">The Even numbers in a given list :\r\n10\r\n12\r\n20\r\n16<\/pre>\n<p><strong>Example2:<\/strong><\/p>\n<p><strong>Input:<\/strong><\/p>\n<pre>Given List = [4, 6, 7, 9, 10, 12, 11]<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">The Even numbers in a given list :\r\n4\r\n6\r\n10\r\n12<\/pre>\n<h2>filter() Function with Examples in Python<\/h2>\n<ul>\n<li><a href=\"#Using_Built-in_Functions_(Static_Input)\">Using Built-in Functions (Static Input)<\/a><\/li>\n<li><a href=\"#Using_Built-in_Functions_(User_Input)\">Using Built-in Functions (User Input)<\/a><\/li>\n<\/ul>\n<h3 id=\"Using_Built-in_Functions_(Static_Input)\">Method #1: Using Built-in Functions (Static Input)<\/h3>\n<p><strong>Approach:<\/strong><\/p>\n<ul>\n<li>Give the list as static input and store it in a variable.<\/li>\n<li>Create a function say Even_numbers which accepts a number as an argument and returns true if the argument is an even number else it returns false.<\/li>\n<li>Check if the given number is even using the if conditional statement.<\/li>\n<li>If it is true, then return True.<\/li>\n<li>Else return False.<\/li>\n<li>Pass the above Function(Even_numbers),\u00a0 given list as arguments to the filter function that returns an iterator in which the items are filtered through a function to determine whether or not the item is accepted.<\/li>\n<li>Store it in another variable.<\/li>\n<li>Loop in the above result using the for loop.<\/li>\n<li>Print the iterator value of the for loop.<\/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\"># Give the list as static input and store it in a variable.\r\ngvn_lst = [3, 10, 12, 13, 20, 7, 1, 16]\r\n\r\n# Create a function say Even_numbers which accepts a number as an argument and returns\r\n# true if the argument is even number else it returns false.\r\n\r\n\r\ndef Even_numbers(numb):\r\n  # Check if the given number is even using the if conditional statement.\r\n    if numb % 2 == 0:\r\n      # If it is true, then return True.\r\n        return True\r\n    # Else return False.\r\n    else:\r\n        return False\r\n\r\n\r\n# Pass the above Function(Even_numbers),\r\n# given list as arguments to the filter function that\r\n# returns an iterator in which the items are filtered\r\n# through a function to determine whether or not the item is accepted.\r\n# Store it in another variable.\r\nevn_numbrs = filter(Even_numbers, gvn_lst)\r\nprint(\"The Even numbers in a given list :\")\r\n# Loop in the above result using the for loop.\r\nfor n in evn_numbrs:\r\n  # Print the iterator value of the for loop.\r\n    print(n)\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">The Even numbers in a given list :\r\n10\r\n12\r\n20\r\n16<\/pre>\n<h5>Using the Lambda Function Within a filter ()<\/h5>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">gvn_lst = [1, 2, 3, 4, 5, 6, 7, 8, 9]\r\n\r\n# The lambda function returns True for odd numbers\r\noddnumbrs_itrtor = filter(lambda n: (n % 2 != 0), gvn_lst)\r\n\r\n# converting to list\r\nodd_numbrs = list(oddnumbrs_itrtor)\r\nprint(\"The Odd numbers in a given list:\")\r\nprint(odd_numbrs)\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">The Odd numbers in a given list:\r\n[1, 3, 5, 7, 9]<\/pre>\n<p>Inside the filter, we have directly passed a lambda function ().<\/p>\n<p>For Odd numbers, our lambda function returns True. As a result, the filter() function returns an iterator that only contains Odd numbers.<\/p>\n<h3 id=\"Using_Built-in_Functions_(User_Input)\">Method #2: Using Built-in Functions (User Input)<\/h3>\n<p><strong>Approach:<\/strong><\/p>\n<ul>\n<li>Give the list as user input using map(),list(),input(),int() functions and store it in a variable.<\/li>\n<li>Create a function say Even_numbers which accepts a number as an argument and returns true if the argument is an even number else it returns false.<\/li>\n<li>Check if the given number is even using the if conditional statement.<\/li>\n<li>If it is true, then return True.<\/li>\n<li>Else return False.<\/li>\n<li>Pass the above Function(Even_numbers),\u00a0 given list as arguments to the filter function that returns an iterator in which the items are filtered through a function to determine whether or not the item is accepted.<\/li>\n<li>Store it in another variable.<\/li>\n<li>Loop in the above result using the for loop.<\/li>\n<li>Print the iterator value of the for loop.<\/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\"># Give the list as user input using list(),int(),split() and map() functions\r\n# and store it in a variable.\r\ngvn_lst = list(map(int, input(\r\n    'Enter some random List Elements separated by spaces = ').split()))\r\n\r\n# Create a function say Even_numbers which accepts a number as an argument and returns\r\n# true if the argument is even number else it returns false.\r\n\r\n\r\ndef Even_numbers(numb):\r\n  # Check if the given number is even using the if conditional statement.\r\n    if numb % 2 == 0:\r\n      # If it is true, then return True.\r\n        return True\r\n    # Else return False.\r\n    else:\r\n        return False\r\n\r\n\r\n# Pass the above Function(Even_numbers),\r\n# given list as arguments to the filter function that\r\n# returns an iterator in which the items are filtered\r\n# through a function to determine whether or not the item is accepted.\r\n# Store it in another variable.\r\nevn_numbrs = filter(Even_numbers, gvn_lst)\r\nprint(\"The Even numbers in a given list :\")\r\n# Loop in the above result using the for loop.\r\nfor n in evn_numbrs:\r\n  # Print the iterator value of the for loop.\r\n    print(n)\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre>Enter some random List Elements separated by spaces = 4 6 7 9 10 12 11\r\nThe Even numbers in a given list :\r\n4\r\n6\r\n10\r\n12<\/pre>\n<p>Fed up with searching various pages for the list of <a href=\"https:\/\/python-programs.com\/python-built-in-functions\/#Python_Built_in_Functions\">Python Built in Functions<\/a>? Look at the tutorial linked here and explore all coding samples of built-in functions of python.<\/p>\n<ul>\n<li><a href=\"https:\/\/python-programs.com\/python-max-function-with-examples\/\">Python max() Function with Examples<\/a><\/li>\n<li><a href=\"https:\/\/python-programs.com\/python-min-function-with-examples\/\">Python min() Function with Examples<\/a><\/li>\n<li><a href=\"https:\/\/python-programs.com\/python-oct-function-with-examples\/\">Python oct() Function with Examples<\/a><\/li>\n<li><a href=\"https:\/\/python-programs.com\/python-next-function-with-examples\/\">Python next() Function with Examples<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>In the previous article, we have discussed Python enumerate() Function with Examples filter() Function in Python: The filter() function returns an iterator in which the items are filtered through a function to determine whether or not the item is accepted. Syntax: filter(function, iterable) Parameter Values: function: It is a function that will be executed for &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/python-programs.com\/python-filter-function-with-examples\/\"> <span class=\"screen-reader-text\">Python filter() Function with Examples<\/span> Read More &raquo;<\/a><\/p>\n","protected":false},"author":7,"featured_media":0,"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 filter() Function with Examples - 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-filter-function-with-examples\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Python filter() Function with Examples - Python Programs\" \/>\n<meta property=\"og:description\" content=\"In the previous article, we have discussed Python enumerate() Function with Examples filter() Function in Python: The filter() function returns an iterator in which the items are filtered through a function to determine whether or not the item is accepted. 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