{"id":2616,"date":"2023-10-18T13:16:40","date_gmt":"2023-10-18T07:46:40","guid":{"rendered":"https:\/\/python-programs.com\/?p=2616"},"modified":"2023-11-10T11:46:46","modified_gmt":"2023-11-10T06:16:46","slug":"python-how-to-check-if-a-key-exists-in-dictionary","status":"publish","type":"post","link":"https:\/\/python-programs.com\/python-how-to-check-if-a-key-exists-in-dictionary\/","title":{"rendered":"Python How to Check if a Key Exists in Dictionary"},"content":{"rendered":"<p>A Python dictionary is a list of objects that are not in any particular order i.e Unordered.<\/p>\n<p>A dictionary is made up of a collection of key-value pairs. Each key-value pair corresponds to a specific value.<\/p>\n<p>Curly braces { } can be used to describe a dictionary by enclosing a comma-separated list of key-value pairs.<\/p>\n<p>Every key is separated from its associated value by a colon &#8220;:&#8221;.<\/p>\n<p>Given a dictionary, the task is to determine whether the given key exists in the dictionary.<\/p>\n<p><strong>Examples:<\/strong><\/p>\n<p><strong>Input :<\/strong><\/p>\n<pre>dictionary = {'This': 100, 'is':200, 'python':300} , key = is<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre>Yes<\/pre>\n<h2 class=\"LC20lb DKV0Md\">Check whether given Key already exists in a Python Dictionary<\/h2>\n<p>There are several ways to check whether the given key exists in the dictionary some of them are:<\/p>\n<ul>\n<li><a href=\"#Using_keys()_function\">Using keys() function<\/a><\/li>\n<li><a href=\"#Using_if-in_Statements\">Using if-in Statements<\/a><\/li>\n<li><a href=\"#Using_List_and_if_statement\">Using List and if statement<\/a><\/li>\n<li><a href=\"#Using_Exceptional_Handling\">Using Exceptional Handling<\/a><\/li>\n<li><a href=\"#Using_get()_function\">Using get() function<\/a><\/li>\n<li><a href=\"#Using_'if_not_in'_statement\">Using &#8216;if not in&#8217; statement<\/a><\/li>\n<\/ul>\n<h3 id=\"Using_keys()_function\">Method #1: Using keys() function<\/h3>\n<p>The keys() method returns a list of all the available keys in the dictionary. Using the inbuilt method keys(), use an if statement and the \u2018in&#8217; operator to determine whether or not the key exists in the dictionary.<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\"># Given Dictionary\r\n\r\ndictionary = {'this': 100, 'is': 200, 'python': 300}\r\n\r\n# Given key\r\nkey = 'is'\r\n\r\n# Checking if key is exist in dictionary using keys() method\r\nif key in dictionary.keys():\r\n  # If the key exits then print yes\r\n    print(\"Yes\")\r\n# If the  key do not exist then print no\r\nelse:\r\n    print(\"No\")\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre>Yes<\/pre>\n<h3 id=\"Using_if-in_Statements\">Method #2: Using if-in Statements<\/h3>\n<p>To verify if a key exists in the dictionary, we can use the \u2018in operator&#8217; directly with the dictionary.<\/p>\n<p>The expression:<\/p>\n<p><code class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">key in dictionary<\/code><\/p>\n<p>If the key exists in the dictionary, it will evaluate to True; otherwise, it will evaluate to False.<\/p>\n<p>Let&#8217;s use this to see if the key is in the dictionary.<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\"># Given Dictionary\r\n\r\ndictionary = {'this': 100, 'is': 200, 'python': 300}\r\n\r\n# Given key\r\nkey = 'is'\r\n\r\n# Using if and in to check whether the key is present in dictionary\r\nif key in dictionary:\r\n  # If the key exits then print yes\r\n    print(\"Yes\")\r\n# If the  key do not exist then print no\r\nelse:\r\n    print(\"No\")\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre>Yes<\/pre>\n<h3 id=\"Using_List_and_if_statement\">Method #3: Using List and if statement<\/h3>\n<ul>\n<li>Convert the dictionary keys to list.<\/li>\n<li>Check if the key present in this list using if statement.<\/li>\n<\/ul>\n<p>Below is the implementation:<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\"># Given Dictionary\r\ndictionary = {'this': 100, 'is': 200, 'python': 300}\r\n\r\n# Given key\r\nkey = 'is'\r\n# Converting dictionary keys to list\r\nkeyslist = list(dictionary.keys())\r\n\r\n# Checking if key is exist in list using if\r\nif key in keyslist:\r\n  # If the key exits then print yes\r\n    print(\"Yes\")\r\n# If the  key do not exist then print no\r\nelse:\r\n    print(\"No\")\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre>Yes<\/pre>\n<h3 id=\"Using_Exceptional_Handling\">Method #4: Using Exceptional Handling<\/h3>\n<p>It will raise a KeyError if we try to access a value of key that does not exist in the dictionary. This can also be used to see if anything exists in the dict.<\/p>\n<p>This can also be a way to check if exist in dictionary or not .<\/p>\n<p>Below is the implementation:<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\"># Given Dictionary\r\ndictionary = {'this': 100, 'is': 200, 'python': 300}\r\n\r\n# Given key\r\nkey = 'is'\r\n# Using try and except\r\ntry:\r\n    # If the key exist in dictionary its value is assigned to test and then it prints yes\r\n    test = dictionary[key]\r\n    print(\"Yes\")\r\n# If the key do not exist in dictionary it prints no\r\nexcept KeyError:\r\n    print(\"No\")\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre>Yes<\/pre>\n<h3 id=\"Using_get()_function\">Method #5: Using get() function<\/h3>\n<p>The dict class in Python has a get() method that accepts a key and a default value.<\/p>\n<p><code class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\">dictionary.get(keyname, value)<\/code><\/p>\n<p>The function&#8217;s behaviour,<\/p>\n<ul>\n<li>If the given key is found in the dictionary, it returns the value associated with that key.<\/li>\n<li>If the given key does not exist in the dictionary, the passed default value argument is returned.<\/li>\n<li>If the given key does not exist in the dictionary and the default value is not provided, it returns None.<\/li>\n<\/ul>\n<p>Below is the implementation:<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\"># Given Dictionary\r\ndictionary = {'this': 100, 'is': 200, 'python': 300}\r\n\r\n# Given key\r\nkey = 'is'\r\n# Using get()\r\nif dictionary.get(key) is not None:\r\n    print(\"Yes\")\r\nelse:\r\n    print(\"No\")\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre>Yes<\/pre>\n<h3 id=\"Using_'if_not_in'_statement\">Method #6 : Using &#8216;if not in&#8217; statement<\/h3>\n<p>We&#8217;ve just verified whether the key exists in the dictionary so far.<\/p>\n<p>However, if we want to verify if a key does not exist in the dictionary, we can use \u2018if not in&#8217; with the dictionary directly.<\/p>\n<p>Below is the implementation:<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\"># Given Dictionary\r\ndictionary = {'this': 100, 'is': 200, 'python': 300}\r\n\r\n# Given key\r\nkey = 'is'\r\n# Using if not in\r\nif key not in dictionary:\r\n  # if the key not in dictionary then we print no\r\n    print(\"No\")\r\nelse:\r\n    print(\"Yes\")\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre>Yes<\/pre>\n<p><strong>Related Programs<\/strong>:<\/p>\n<ul>\n<li><a href=\"https:\/\/python-programs.com\/how-to-check-if-a-file-or-directory-or-link-exists-in-python\/\">how to check if a file or directory or link exists in python<\/a><\/li>\n<li><a href=\"https:\/\/python-programs.com\/how-to-check-if-a-given-key-exists-in-a-map-cpp\/\">how to check if a given key exists in a map cpp<\/a><\/li>\n<li><a href=\"https:\/\/python-programs.com\/python-check-if-a-value-exists-in-the-dictionary\/\">python check if a value exists in the dictionary<\/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\/how-to-convert-a-list-to-dictionary-in-python\/\">how to convert a list to dictionary in python<\/a><\/li>\n<li><a href=\"https:\/\/python-programs.com\/python-how-to-sort-a-dictionary-by-key-or-value\/\">python how to sort a dictionary by key or value<\/a><\/li>\n<li><a href=\"https:\/\/python-programs.com\/python-how-to-get-all-keys-with-maximum-value-in-a-dictionary\/\">python how to get all keys with maximum value in a dictionary<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>A Python dictionary is a list of objects that are not in any particular order i.e Unordered. A dictionary is made up of a collection of key-value pairs. Each key-value pair corresponds to a specific value. Curly braces { } can be used to describe a dictionary by enclosing a comma-separated list of key-value pairs. &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/python-programs.com\/python-how-to-check-if-a-key-exists-in-dictionary\/\"> <span class=\"screen-reader-text\">Python How to Check if a Key Exists in Dictionary<\/span> Read More &raquo;<\/a><\/p>\n","protected":false},"author":7,"featured_media":6759,"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 Check if a Key Exists in Dictionary - 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-check-if-a-key-exists-in-dictionary\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Python How to Check if a Key Exists in Dictionary - Python Programs\" \/>\n<meta property=\"og:description\" content=\"A Python dictionary is a list of objects that are not in any particular order i.e Unordered. 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A dictionary is made up of a collection of key-value pairs. Each key-value pair corresponds to a specific value. 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