{"id":25579,"date":"2021-11-23T08:55:20","date_gmt":"2021-11-23T03:25:20","guid":{"rendered":"https:\/\/python-programs.com\/?p=25579"},"modified":"2021-11-23T08:55:20","modified_gmt":"2021-11-23T03:25:20","slug":"python-itertools-dropwhile-function-with-examples","status":"publish","type":"post","link":"https:\/\/python-programs.com\/python-itertools-dropwhile-function-with-examples\/","title":{"rendered":"Python Itertools.dropwhile() Function with Examples"},"content":{"rendered":"<p><strong>Itertools Module:<\/strong><\/p>\n<p>Itertools is a Python module that contains a collection of functions for dealing with iterators. They make it very simple to iterate through iterables such as lists and strings.<\/p>\n<p><strong> Itertools.dropwhile() Function:<\/strong><\/p>\n<p>Only after the func. in argument returns false for the first time does Python&#8217;s dropwhile() function return an iterator.<\/p>\n<p><strong>Syntax:<\/strong><\/p>\n<pre>dropwhile(function, sequence)<\/pre>\n<p><strong>Examples:<\/strong><\/p>\n<p><strong>Example1:<\/strong><\/p>\n<p><strong>Input:<\/strong><\/p>\n<pre>Given List = [6, 7, -3, -1, 4]<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">[-3, -1, 4]<\/pre>\n<p><strong>Explanation:<\/strong><\/p>\n<pre>Here it removes the positive numbers 6, 7 and the condition becomes false \r\nwhen the number the number is -3. so, the list remains unchanged afterwards.<\/pre>\n<p><strong>Example2:<\/strong><\/p>\n<p><strong>Input:<\/strong><\/p>\n<pre>Given List = [3, 6, 8, -4, -9, 10, 56]<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre>[-4, -9, 10, 56]<\/pre>\n<h2>Itertools.dropwhile() 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>Import itertools module using the import keyword.<\/li>\n<li>Create a function say checkpositive which accepts the number as argument and returns True if the number is greater than 0.<\/li>\n<li>Inside the function, return True if the given argument is greater than 0.<\/li>\n<li>Give the list as static input and store it in a variable.<\/li>\n<li>Pass the above function and given list as the arguments to the itertools.dropwhile()\u00a0 function and store it in a variable.<\/li>\n<li>Convert the above result into a list using the list() function and store it in another variable.<\/li>\n<li>Print the above result.<\/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 itertools module using the import keyword.\r\nimport itertools\r\n\r\n# Create a function say checkpositive which accepts the number as argument and\r\n# returns True if the number is greater than 0.\r\n\r\n\r\ndef checkpositive(num):\r\n    # Return True if the given argument is greater than 0\r\n    return num &gt; 0\r\n\r\n\r\n# Give the list as static input and store it in a variable.\r\ngvn_lst = [6, 7, -3, -1, 4]\r\n# Pass the above function and given list as the arguments to the\r\n# itertools.dropwhile()  function and store it in a variable.\r\nrslt = itertools.dropwhile(checkpositive, gvn_lst)\r\n# Convert the above result into a list using the list() function and store it\r\n# in another variable.\r\nrslt_lst = list(rslt)\r\n# Print the above result.\r\nprint(rslt_lst)\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">[-3, -1, 4]<\/pre>\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>Import itertools module using the import keyword.<\/li>\n<li>Create a function say checkpositive which accepts the number as argument and returns True if the number is greater than 0.<\/li>\n<li>Inside the function, return True if the given argument is greater than 0.<\/li>\n<li>Give the list as user input using list(),map(),input(),and split() functions.<\/li>\n<li>Store it in a variable.<\/li>\n<li>Pass the above function and given list as the arguments to the itertools.dropwhile()\u00a0 function and store it in a variable.<\/li>\n<li>Convert the above result into a list using the list() function and store it in another variable.<\/li>\n<li>Print the above result.<\/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 itertools module using the import keyword.\r\nimport itertools\r\n\r\n# Create a function say checkpositive which accepts the number as argument and\r\n# returns True if the number is greater than 0.\r\n\r\n\r\ndef checkpositive(num):\r\n    # Return True if the given argument is greater than 0\r\n    return num &gt; 0\r\n\r\n\r\n# Give the list as user input using list(),map(),input(),and split() functions.\r\n# 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# Pass the above function and given list as the arguments to the\r\n# itertools.dropwhile()  function and store it in a variable.\r\nrslt = itertools.dropwhile(checkpositive, gvn_lst)\r\n# Convert the above result into a list using the list() function and store it\r\n# in another variable.\r\nrslt_lst = list(rslt)\r\n# Print the above result.\r\nprint(rslt_lst)\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre>Enter some random List Elements separated by spaces = 3 6 8 -4 -9 10 56\r\n[-4, -9, 10, 56]<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Itertools Module: Itertools is a Python module that contains a collection of functions for dealing with iterators. They make it very simple to iterate through iterables such as lists and strings. Itertools.dropwhile() Function: Only after the func. in argument returns false for the first time does Python&#8217;s dropwhile() function return an iterator. Syntax: dropwhile(function, sequence) &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/python-programs.com\/python-itertools-dropwhile-function-with-examples\/\"> <span class=\"screen-reader-text\">Python Itertools.dropwhile() 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 Itertools.dropwhile() 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-itertools-dropwhile-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 Itertools.dropwhile() Function with Examples - Python Programs\" \/>\n<meta property=\"og:description\" content=\"Itertools Module: Itertools is a Python module that contains a collection of functions for dealing with iterators. 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