{"id":5581,"date":"2023-10-28T17:00:29","date_gmt":"2023-10-28T11:30:29","guid":{"rendered":"https:\/\/python-programs.com\/?p=5581"},"modified":"2023-11-10T12:05:01","modified_gmt":"2023-11-10T06:35:01","slug":"what-is-a-dictionary-in-python-and-why-do-we-need-it","status":"publish","type":"post","link":"https:\/\/python-programs.com\/what-is-a-dictionary-in-python-and-why-do-we-need-it\/","title":{"rendered":"What is a Dictionary in Python and why do we need it"},"content":{"rendered":"<p>Dictionaries are Python\u2019s implementation of an associative list, which\u00a0<span class=\"rcolor5\" data-name=\"is a|may be a|could be a\">may be a\u00a0<\/span><span class=\"rcolor6\" data-name=\"data structure|arrangement|organization|organisation|system\">arrangement\u00a0<\/span>. A dictionary\u00a0<span class=\"rcolor1\" data-name=\"is a|may be a|could be a\">may be a\u00a0<\/span>collection of key-value pairs that are stored together. A key and its value are represented by each key-value pair.<\/p>\n<h2>Dictionary in Python and why do we need it<\/h2>\n<ul>\n<li><a href=\"#Dictionary_in_Python\">Dictionary in Python<\/a><\/li>\n<li><a href=\"#Use_of_Dictionary\">Use of Dictionary<\/a><\/li>\n<li><a href=\"#Creating_a_new_Dictionary\">Creating a new Dictionary<\/a><\/li>\n<li><a href=\"#The_most_important_things_to_know_about_keys_in_the_dictionary\">The most important things to know about keys in the dictionary<\/a><\/li>\n<li><a href=\"#The_most_important_things_to_know_about_values_in_the_dictionary\">The most important things to know about values in the dictionary<\/a><\/li>\n<li><a href=\"#Accessing_an_element_in_dictionary\">Accessing an element in dictionary<\/a><\/li>\n<\/ul>\n<h3 id=\"Dictionary_in_Python\">1)Dictionary in Python<\/h3>\n<p>This is a dictionary example that contains cricket names as keys and the highest score as\u00a0values. Elements are stored as key-value pairs in the dictionary, where each value is mapped to one key. It is also called a hash table or an associative array.<\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-medium wp-image-5583\" src=\"https:\/\/python-programs.com\/wp-content\/uploads\/2021\/05\/dictionary-300x257.jpg\" alt=\"dictionary\" width=\"300\" height=\"257\" srcset=\"https:\/\/python-programs.com\/wp-content\/uploads\/2021\/05\/dictionary-300x257.jpg 300w, https:\/\/python-programs.com\/wp-content\/uploads\/2021\/05\/dictionary.jpg 342w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<p>There are four elements in the above dictionary, i.e. four key-value pairs.<\/p>\n<ol>\n<li>Devilliers &amp; 176<\/li>\n<li>Virat Kohli &amp; 183<\/li>\n<li>Dhoni &amp; 183<\/li>\n<li>Gayle &amp; 237<\/li>\n<\/ol>\n<h3 id=\"Use_of_Dictionary\">2)Use of Dictionary<\/h3>\n<p>As a dictionary, it holds the elements in key-value mapping format and uses hashing internally; as a result, we can easily retrieve a value from the dictionary by its key. In the best-case scenario, its complexity is O(1), while in the worst-case scenario, it can be O(n).<\/p>\n<h3 id=\"Creating_a_new_Dictionary\">3)Creating a new Dictionary<\/h3>\n<p>We can create dictionary by two ways i.e two types of syntaxes.<\/p>\n<ol>\n<li>dict()<\/li>\n<li>{}<\/li>\n<\/ol>\n<p>It will generate an empty dictionary.<br \/>\nTransfer the key-value pairs in curly braces to build a dictionary of objects. A colon will also be used to divide the key and value in each pair (:).<\/p>\n<p>Let us create a sample dictionary and print the key value pairs in 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# printing the dictionary\r\nprint(dictionary)\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">{'This': 100, 'is': 200, 'BTechGeeks': 300}<\/pre>\n<h3 id=\"The_most_important_things_to_know_about_keys_in_the_dictionary\">4)The most important things to know about keys in the dictionary<\/h3>\n<p>Keys in the dictionary are always unique, and they must be of an immutable data type, such as strings, numbers, or tuples.<br \/>\nThis means that once a key-value pair is added to the dictionary, we cannot change the key itself, but we can change the value associated with it.<\/p>\n<p>For example, suppose we make a dictionary with duplicate keys and print its contents.<\/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, 'This': 300}\r\n# printing the dictionary\r\nprint(dictionary)\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">{'This': 300, 'is': 200}<\/pre>\n<h3 id=\"The_most_important_things_to_know_about_values_in_the_dictionary\">5)The most important things to know about values in the dictionary<\/h3>\n<p>A dictionary&#8217;s values can be of any type.<\/p>\n<p>Let&#8217;s make a dictionary where the key is an integer and the value is a list of strings.<\/p>\n<p><strong>Below is the implementation:<\/strong><\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\"># given dictionary\r\ndictionary = {1: [\"HELLO\", \"THIS\", 453], \r\n              2: [\"BTECHGEEKS\", 345, 87, 4.5], \r\n              3: [\"PYTHON\", True, 3.2, 100]}\r\n# printing the dictionary\r\nprint(dictionary)\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">{1: ['HELLO', 'THIS', 453], 2: ['BTECHGEEKS', 345, 87, 4.5], 3: ['PYTHON', True, 3.2, 100]}<\/pre>\n<h3 id=\"Accessing_an_element_in_dictionary\">6)Accessing an element in dictionary<\/h3>\n<p>Using the [] operator on the dictionary object, we can access a specific item\/pair in a dictionary. If we use the dictionary object&#8217;s operator [] and pass a key, it will return its value as shown below.<\/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, 'This': 300}\r\n# printing the element value in dictionary\r\nprint(dictionary['is'])\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">200<\/pre>\n<p>Now when we pass a key which does not exist in the dictionary, a KeyError is returned<\/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# printing the element value in dictionary\r\nprint(dictionary['python'])\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">Traceback (most recent call last):\r\n  File \"\/home\/eb2788937138651d15b1bf1915ff16a5.py\", line 4, in &lt;module&gt;\r\n    print(dictionary['python'])\r\nKeyError: 'python'<\/pre>\n<p><strong>Related Programs<\/strong>:<\/p>\n<ul>\n<li><a href=\"https:\/\/python-programs.com\/what-is-a-structured-numpy-array-and-how-to-create-and-sort-it-in-python\/\">what is a structured numpy array and how to create and sort it in python<\/li>\n<li><a href=\"https:\/\/python-programs.com\/whats-placement-new-operator-and-why-do-we-need-it\/\">whats placement new operator and why do we need it<\/li>\n<li><a href=\"https:\/\/python-programs.com\/what-is-an-exception-and-how-to-do-exception-handling-in-java\/\">what is an exception and how to do exception handling in java<\/li>\n<li><a href=\"https:\/\/python-programs.com\/python-program-to-generate-a-dictionary-that-contains-numbers-between-1-and-n-in-the-form-x-xx\/\">python program to generate a dictionary that contains numbers between 1 and n in the form x xx<\/li>\n<li><a href=\"https:\/\/python-programs.com\/python-program-to-find-all-numbers-in-a-range-which-are-perfect-squares-and-sum-of-all-digits-in-the-number-is-less-than-10\/\">python program to find all numbers in a range which are perfect squares and sum of all digits in the number is less than 10<\/li>\n<li><a href=\"https:\/\/python-programs.com\/python-program-to-create-a-class-in-which-one-method-accepts-a-string-from-the-user-and-another-prints-it\/\">python program to create a class in which one method accepts a string from the user and another prints it<\/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<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Dictionaries are Python\u2019s implementation of an associative list, which\u00a0may be a\u00a0arrangement\u00a0. A dictionary\u00a0may be a\u00a0collection of key-value pairs that are stored together. A key and its value are represented by each key-value pair. Dictionary in Python and why do we need it Dictionary in Python Use of Dictionary Creating a new Dictionary The most important &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/python-programs.com\/what-is-a-dictionary-in-python-and-why-do-we-need-it\/\"> <span class=\"screen-reader-text\">What is a Dictionary in Python and why do we need it<\/span> Read More &raquo;<\/a><\/p>\n","protected":false},"author":7,"featured_media":5592,"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>What is a Dictionary in Python and why do we need it - 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\/what-is-a-dictionary-in-python-and-why-do-we-need-it\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What is a Dictionary in Python and why do we need it - Python Programs\" \/>\n<meta property=\"og:description\" content=\"Dictionaries are Python\u2019s implementation of an associative list, which\u00a0may be a\u00a0arrangement\u00a0. 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A dictionary\u00a0may be a\u00a0collection of key-value pairs that are stored together. A key and its value are represented by each key-value pair. 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