{"id":3192,"date":"2021-04-21T12:44:59","date_gmt":"2021-04-21T07:14:59","guid":{"rendered":"https:\/\/python-programs.com\/?p=3192"},"modified":"2021-11-22T18:44:58","modified_gmt":"2021-11-22T13:14:58","slug":"python-iterate-over-dictionary-all-key-value-pairs","status":"publish","type":"post","link":"https:\/\/python-programs.com\/python-iterate-over-dictionary-all-key-value-pairs\/","title":{"rendered":"Python: Iterate Over Dictionary (All Key-Value pairs)"},"content":{"rendered":"<p>Python&#8217;s implementation of an associative array, which is a data structure, is dictionaries. A dictionary is a collection of key-value pairs. Each key-value pair represents a key and its associated value.<\/p>\n<p>Enclosing a comma-separated list of key-value pairs in curly braces defines a dictionary { }. A colon <strong>\u2018 : \u2018<\/strong> separates each key from its associated value.<\/p>\n<p><strong>Note:<\/strong><\/p>\n<ul>\n<li>Keys are mapped to values in dictionaries, which are then stored in an array or series.<\/li>\n<li>The keys must be of the hashable form, which means that their hash value must remain constant over their lifetime.<\/li>\n<\/ul>\n<p>The keys and values of a dictionary are iterated over in the same order as they were generated in Python 3.6 and later. However, this behaviour varies between Python versions and is dependent on the dictionary&#8217;s insertion and deletion history.<\/p>\n<p><strong>Examples:<\/strong><\/p>\n<p><strong>Input :<\/strong><\/p>\n<pre>dictionary = {'This': 100, 'is':200, 'BTechGeeks':300}<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">This 100\r\nis 200\r\nBTechGeeks 300<\/pre>\n<h2>Traverse the dictionary<\/h2>\n<p>There are several ways to traverse the dictionary some of them are:<\/p>\n<ul>\n<li><a href=\"#Using_for_loop\">Using for loop<\/a><\/li>\n<li><a href=\"#Using_items()\">Using items()<\/a><\/li>\n<li><a href=\"#Using_List_Comprehension\">Using List Comprehension<\/a><\/li>\n<li><a href=\"#Filtering_Items_in_dictionary\">Filtering Items in dictionary<\/a><\/li>\n<\/ul>\n<h3 id=\"Using_for_loop\">Method #1: Using for loop<\/h3>\n<p>To iterate over all keys in a dictionary, a dictionary object may also be used as an iterable object. As a result, we can apply for loop on a dictionary with ease. It loops through all the keys in the dictionary by using for in the dictionary. We will pick the value associated with each key and print it.<\/p>\n<p><strong>Below is the implementation:<\/strong><\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\"># Given dictionary\r\ndictionary = {'This': 100, 'is': 200, 'BTechGeeks': 300}\r\n# Using for loop to traverse the dictionary\r\nfor key in dictionary:\r\n    # here key gives the key of the dictionary\r\n    # Getting value at key\r\n    value = dictionary[key]\r\n    # printing values and keys\r\n    print(key, value)\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">This 100\r\nis 200\r\nBTechGeeks 300<\/pre>\n<h3 id=\"Using_items()\">Method #2:Using items()<\/h3>\n<p>When dealing with dictionaries, you&#8217;ll almost certainly want to use both the keys and the values. .items(), a method that returns a new view of the dictionary&#8217;s items, is one of the most useful ways to iterate through a dictionary in Python.<\/p>\n<p>This sequence is an iterable View object that contains all of the dictionary&#8217;s key,value elements. It is supported by the original dictionary. Let&#8217;s use this to iterate over all of the dictionary&#8217;s key-value pairs.<\/p>\n<p><strong>Below is the implementation:<\/strong><\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\"># Given dictionary\r\ndictionary = {'This': 100, 'is': 200, 'BTechGeeks': 300}\r\n# Using items and converting dictionary to list\r\ndictlist = list(dictionary.items())\r\n# Traverse the dictlist and print key and values of dictionary\r\nfor i in dictlist:\r\n  # printing key and value\r\n    print(i[0], i[1])\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">This 100\r\nis 200\r\nBTechGeeks 300<\/pre>\n<h3 id=\"Using_List_Comprehension\">Method #3:Using List Comprehension<\/h3>\n<p>Since the items() function of a dictionary returns an iterable sequence of key-value pairs, we may use this list comprehension to iterate over all diction pairs.<\/p>\n<p><strong>Below is the implementation:<\/strong><\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\"># Given dictionary\r\ndictionary = {'This': 100, 'is': 200, 'BTechGeeks': 300}\r\n# Using list comprehension\r\n[print(key, value) for key, value in dictionary.items()]\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">This 100\r\nis 200\r\nBTechGeeks 300<\/pre>\n<h3 id=\"Filtering_Items_in_dictionary\">Filtering Items in dictionary<\/h3>\n<p>You can find yourself in a situation where you have an existing dictionary and want to construct a new one to store only the data that meets a set of criteria. This can be accomplished using an if statement inside a for loop, as shown below:<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\"># Given dictionary\r\ndictionary = {'This': 100, 'is': 200, 'BTechGeeks': 300}\r\n# Create a new empty dictionary\r\nnewdictionary = dict()\r\n# Traverse the original dictionary and check the condition\r\nfor key, value in dictionary.items():\r\n    # If value meets the criteria, it should be saved in new dict.\r\n    if value &lt;= 200:\r\n        newdictionary[key] = value\r\n# printing the new dictionary\r\nprint(newdictionary)\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">{'This': 100, 'is': 200}<\/pre>\n<p><strong>Related Programs<\/strong>:<\/p>\n<ul>\n<li><a href=\"https:\/\/python-programs.com\/python-iterate-over-dictionary-with-index\/\">python iterate over dictionary with index<\/li>\n<li><a href=\"https:\/\/python-programs.com\/python-iterate-over-dictionary-with-list-values\/\">python iterate over dictionary with list values<\/li>\n<li><a href=\"https:\/\/python-programs.com\/python-iterate-loop-over-all-nested-dictionary-values\/\">python iterate loop over all nested dictionary values<\/li>\n<li><a href=\"https:\/\/python-programs.com\/python-how-to-iterate-over-nested-dictionary-dict-of-dicts\/\">python how to iterate over nested dictionary dict of dicts<\/li>\n<li><a href=\"https:\/\/python-programs.com\/loop-iterate-over-all-values-of-dictionary-in-python\/\">loop iterate over all values of dictionary in python<\/li>\n<li><a href=\"https:\/\/python-programs.com\/python-iterate-over-dictionary-and-remove-items\/\">python iterate over dictionary and remove items<\/li>\n<li><a href=\"https:\/\/python-programs.com\/python-how-to-iterate-over-a-list\/\">python how to iterate over a list<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Python&#8217;s implementation of an associative array, which is a data structure, is dictionaries. A dictionary is a collection of key-value pairs. Each key-value pair represents a key and its associated value. Enclosing a comma-separated list of key-value pairs in curly braces defines a dictionary { }. A colon \u2018 : \u2018 separates each key from &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/python-programs.com\/python-iterate-over-dictionary-all-key-value-pairs\/\"> <span class=\"screen-reader-text\">Python: Iterate Over Dictionary (All Key-Value pairs)<\/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: Iterate Over Dictionary (All Key-Value pairs) - 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-iterate-over-dictionary-all-key-value-pairs\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Python: Iterate Over Dictionary (All Key-Value pairs) - Python Programs\" \/>\n<meta property=\"og:description\" content=\"Python&#8217;s implementation of an associative array, which is a data structure, is dictionaries. 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