{"id":2991,"date":"2023-10-19T19:52:37","date_gmt":"2023-10-19T14:22:37","guid":{"rendered":"https:\/\/python-programs.com\/?p=2991"},"modified":"2023-11-10T11:48:43","modified_gmt":"2023-11-10T06:18:43","slug":"python-dictionary-with-multiple-values-per-key","status":"publish","type":"post","link":"https:\/\/python-programs.com\/python-dictionary-with-multiple-values-per-key\/","title":{"rendered":"Python: Dictionary with Multiple Values per Key"},"content":{"rendered":"<h2>How we can create a dictionary with multiple values per key in python.<\/h2>\n<p>In python a dictionary is one of the important datatype which is used to store data values in <code>key : value<\/code> pair. Generally keys and values are mapped one-to-one. But it is not impossible that we can not map multiple values to a single key. So in this article we will discuss how we can map multiple values per key in dictionary.<\/p>\n<p><strong>Syntax of dictionary :<\/strong><\/p>\n<pre>dictionary_name = {key1: value1, key2: value2}<\/pre>\n<p>where,<\/p>\n<ul>\n<li>key1, key2&#8230; represents keys in a dictionary. These keys can be a string, integer, tuple, etc. But keys needs to be unique.<\/li>\n<li>value1, value2&#8230; represents values in dictionary. These values can be numbers, strings, list or list within a list etc.<\/li>\n<li>key and value is separated by : symbol.<\/li>\n<li>key-value pair symbol is separated by , symbol.<\/li>\n<\/ul>\n<p>Example of a dictionary <code>covid_case<\/code> where multiple values are associated with single key.<\/p>\n<pre>covid_case = {\"January\": [1000,1500,2000], \"February\": [1100,1300,1500], \"March\":[2000,2200,2400] }<\/pre>\n<p>So, now let&#8217;s explore the concept how to add a\u00a0<code>key:value<\/code>\u00a0pair to dictionary in Python.<\/p>\n<h3>Create a dictionary with a list as the value :<\/h3>\n<p>Generally, when multiple values are mapped to a single key, then that dictionary is called as MultiDict. So, let&#8217;s see an example how in dictionary multiple values are mapped to a single key.<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">#Program :\r\n\r\n#Multiple values mapped to single key\r\ncovid_case = {\"January\": [1000,1500,2000], \"February\": [1100,1300,1500], \"March\":[2000,2200,2400] }\r\n#printing the multidict\r\nprint(\"Dictionary with multiple values per key :\")\r\nprint(covid_case)\r\n<\/pre>\n<pre>Output :\r\nDictionary with multiple values per key :\r\n{\"January\": [1000,1500,2000], \"February\": [1100,1300,1500], \"March\":[2000,2200,2400] }<\/pre>\n<p>In this example string keys have taken in a dictionary where multiple integer values are mapped to single key.<\/p>\n<h3>Finding multiple values of a key in the dictionary :<\/h3>\n<p>Like how we created a dictionary with a list as a value, similar we can get a list as output also. Means it is possible to get multiple values of a key in dictionary. So, let&#8217;s see an example how we can get multiple values of a key as a list.<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">#Program :\r\n\r\n#Multiple values mapped to single key\r\ncovid_case = {\"January\": [1000,1500,2000], \"February\": [1100,1300,1500], \"March\":[2000,2200,2400] }\r\n#printing the multidict\r\nprint(\"Complete dictionary :\")\r\nprint(covid_case)\r\n#Getting the list(multiple values) at key February\r\noutput_list=covid_case[\"February\"]\r\n#printing the multiple values of key February\r\nprint(\"Multiple values of key 'February' :\")\r\nprint(output_list)<\/pre>\n<pre>Output :\r\nComplete dictionary :\r\n{\"January\": [1000,1500,2000], \"February\": [1100,1300,1500], \"March\":[2000,2200,2400] }\r\nMultiple values of key 'February' :\r\n[1100,1300,1500]<\/pre>\n<h3>Append multiple values to a key in a dictionary :<\/h3>\n<p>It is easy to create a dictionary where multiple values are mapped to a single key. But the tricky part is appending multiple values where already multiple values are mapped to that key.<\/p>\n<p>So there 2 cases may arise i.e<\/p>\n<ol>\n<li>The key is already present with multiple values and new values will be added in that key.<\/li>\n<li>The key is not present in the dictionary, so new key with multiple values will be appended to that dictionary.<\/li>\n<\/ol>\n<p><strong>CASE -1 : Key is already present in dictionary :<\/strong><\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">#Program :\r\n\r\n#Multiple values mapped to single key\r\ncovid_case = {\"January\": [1000,1500,2000], \"February\": [1100,1300,1500], \"March\":[2000,2200,2400] }\r\n#printing the multidict\r\nprint(\"Before append :\")\r\nprint(covid_case)\r\n\r\n\r\n# Append multiple values to a key in dictionary covid_case \r\ndef add_values_to_key(temp_dict, key, list_of_values):\r\n    if key not in temp_dict:\r\n        temp_dict[key] = list()\r\n    temp_dict[key].extend(list_of_values)\r\n    return temp_dict\r\n    \r\n    \r\n# Append multiple values for existing key 'March'\r\ncovid_case = add_values_to_key(covid_case, 'March', [2600, 2800])\r\n#printing the multidict\r\nprint(\"After append :\")\r\nprint(covid_case)\r\n<\/pre>\n<pre>Output :\r\nBefore append :\r\n{\"January\": [1000,1500,2000], \"February\": [1100,1300,1500], \"March\":[2000,2200,2400] }\r\nAfter append :\r\n{\"January\": [1000,1500,2000], \"February\": [1100,1300,1500], \"March\":[2000,2200,2400,2600,2800] }<\/pre>\n<p><strong>CASE -2 : Key is not present in dictionary :<\/strong><\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">#Program :\r\n\r\n#Multiple values mapped to single key\r\ncovid_case = {\"January\": [1000,1500,2000], \"February\": [1100,1300,1500], \"March\":[2000,2200,2400] }\r\n#printing the multidict\r\nprint(\"Before append :\")\r\nprint(covid_case)\r\n\r\n\r\n# Append multiple values to a key in dictionary covid_case \r\ndef add_values_to_key(temp_dict, key, list_of_values):\r\n    if key not in temp_dict:\r\n        temp_dict[key] = list()\r\n    temp_dict[key].extend(list_of_values)\r\n    return temp_dict\r\n    \r\n    \r\n# Append multiple values for key 'April'\r\n#As key 'April' is not present so new key with multiple values will be added\r\ncovid_case = add_values_to_key(covid_case, 'April', [3000, 3500])\r\n#printing the multidict\r\nprint(\"after append :\")\r\nprint(covid_case)\r\n<\/pre>\n<pre>Output :\r\nBefore append :\r\n{\"January\": [1000,1500,2000], \"February\": [1100,1300,1500], \"March\":[2000,2200,2400] }\r\nAfter append :\r\n{\"January\": [1000,1500,2000], \"February\": [1100,1300,1500], \"March\":[2000,2200,2400], \"April\":[3000,3500 }<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>How we can create a dictionary with multiple values per key in python. In python a dictionary is one of the important datatype which is used to store data values in key : value pair. Generally keys and values are mapped one-to-one. But it is not impossible that we can not map multiple values to &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/python-programs.com\/python-dictionary-with-multiple-values-per-key\/\"> <span class=\"screen-reader-text\">Python: Dictionary with Multiple Values per Key<\/span> Read More &raquo;<\/a><\/p>\n","protected":false},"author":9,"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: Dictionary with Multiple Values per Key - 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-dictionary-with-multiple-values-per-key\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Python: Dictionary with Multiple Values per Key - Python Programs\" \/>\n<meta property=\"og:description\" content=\"How we can create a dictionary with multiple values per key in python. In python a dictionary is one of the important datatype which is used to store data values in key : value pair. Generally keys and values are mapped one-to-one. But it is not impossible that we can not map multiple values to &hellip; Python: Dictionary with Multiple Values per Key Read More &raquo;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/python-programs.com\/python-dictionary-with-multiple-values-per-key\/\" \/>\n<meta property=\"og:site_name\" content=\"Python Programs\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/btechgeeks\" \/>\n<meta property=\"article:published_time\" content=\"2023-10-19T14:22:37+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-11-10T06:18:43+00:00\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@btech_geeks\" \/>\n<meta name=\"twitter:site\" content=\"@btech_geeks\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Satyabrata Jena\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Organization\",\"@id\":\"https:\/\/python-programs.com\/#organization\",\"name\":\"BTech Geeks\",\"url\":\"https:\/\/python-programs.com\/\",\"sameAs\":[\"https:\/\/www.instagram.com\/btechgeeks\/\",\"https:\/\/www.linkedin.com\/in\/btechgeeks\",\"https:\/\/in.pinterest.com\/btechgeek\/\",\"https:\/\/www.youtube.com\/channel\/UC9MlCqdJ3lKqz2p5114SDIg\",\"https:\/\/www.facebook.com\/btechgeeks\",\"https:\/\/twitter.com\/btech_geeks\"],\"logo\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/python-programs.com\/#\/schema\/logo\/image\/\",\"url\":\"https:\/\/python-programs.com\/wp-content\/uploads\/2020\/11\/BTechGeeks.png\",\"contentUrl\":\"https:\/\/python-programs.com\/wp-content\/uploads\/2020\/11\/BTechGeeks.png\",\"width\":350,\"height\":70,\"caption\":\"BTech Geeks\"},\"image\":{\"@id\":\"https:\/\/python-programs.com\/#\/schema\/logo\/image\/\"}},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/python-programs.com\/#website\",\"url\":\"https:\/\/python-programs.com\/\",\"name\":\"Python Programs\",\"description\":\"Python Programs with Examples, How To Guides on Python\",\"publisher\":{\"@id\":\"https:\/\/python-programs.com\/#organization\"},\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/python-programs.com\/?s={search_term_string}\"},\"query-input\":\"required name=search_term_string\"}],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/python-programs.com\/python-dictionary-with-multiple-values-per-key\/#webpage\",\"url\":\"https:\/\/python-programs.com\/python-dictionary-with-multiple-values-per-key\/\",\"name\":\"Python: Dictionary with Multiple Values per Key - Python Programs\",\"isPartOf\":{\"@id\":\"https:\/\/python-programs.com\/#website\"},\"datePublished\":\"2023-10-19T14:22:37+00:00\",\"dateModified\":\"2023-11-10T06:18:43+00:00\",\"breadcrumb\":{\"@id\":\"https:\/\/python-programs.com\/python-dictionary-with-multiple-values-per-key\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/python-programs.com\/python-dictionary-with-multiple-values-per-key\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/python-programs.com\/python-dictionary-with-multiple-values-per-key\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\/\/python-programs.com\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Python: Dictionary with Multiple Values per Key\"}]},{\"@type\":\"Article\",\"@id\":\"https:\/\/python-programs.com\/python-dictionary-with-multiple-values-per-key\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/python-programs.com\/python-dictionary-with-multiple-values-per-key\/#webpage\"},\"author\":{\"@id\":\"https:\/\/python-programs.com\/#\/schema\/person\/0f6d731bda7051ce3586f71299f391cd\"},\"headline\":\"Python: Dictionary with Multiple Values per Key\",\"datePublished\":\"2023-10-19T14:22:37+00:00\",\"dateModified\":\"2023-11-10T06:18:43+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/python-programs.com\/python-dictionary-with-multiple-values-per-key\/#webpage\"},\"wordCount\":388,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/python-programs.com\/#organization\"},\"articleSection\":[\"Python\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/python-programs.com\/python-dictionary-with-multiple-values-per-key\/#respond\"]}]},{\"@type\":\"Person\",\"@id\":\"https:\/\/python-programs.com\/#\/schema\/person\/0f6d731bda7051ce3586f71299f391cd\",\"name\":\"Satyabrata Jena\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/python-programs.com\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/c1bf8033ec357d085f41815bee1625cc?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/c1bf8033ec357d085f41815bee1625cc?s=96&d=mm&r=g\",\"caption\":\"Satyabrata Jena\"},\"url\":\"https:\/\/python-programs.com\/author\/satyabrata\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"Python: Dictionary with Multiple Values per Key - Python Programs","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/python-programs.com\/python-dictionary-with-multiple-values-per-key\/","og_locale":"en_US","og_type":"article","og_title":"Python: Dictionary with Multiple Values per Key - Python Programs","og_description":"How we can create a dictionary with multiple values per key in python. In python a dictionary is one of the important datatype which is used to store data values in key : value pair. Generally keys and values are mapped one-to-one. But it is not impossible that we can not map multiple values to &hellip; Python: Dictionary with Multiple Values per Key Read More &raquo;","og_url":"https:\/\/python-programs.com\/python-dictionary-with-multiple-values-per-key\/","og_site_name":"Python Programs","article_publisher":"https:\/\/www.facebook.com\/btechgeeks","article_published_time":"2023-10-19T14:22:37+00:00","article_modified_time":"2023-11-10T06:18:43+00:00","twitter_card":"summary_large_image","twitter_creator":"@btech_geeks","twitter_site":"@btech_geeks","twitter_misc":{"Written by":"Satyabrata Jena","Est. reading time":"4 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"Organization","@id":"https:\/\/python-programs.com\/#organization","name":"BTech Geeks","url":"https:\/\/python-programs.com\/","sameAs":["https:\/\/www.instagram.com\/btechgeeks\/","https:\/\/www.linkedin.com\/in\/btechgeeks","https:\/\/in.pinterest.com\/btechgeek\/","https:\/\/www.youtube.com\/channel\/UC9MlCqdJ3lKqz2p5114SDIg","https:\/\/www.facebook.com\/btechgeeks","https:\/\/twitter.com\/btech_geeks"],"logo":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/python-programs.com\/#\/schema\/logo\/image\/","url":"https:\/\/python-programs.com\/wp-content\/uploads\/2020\/11\/BTechGeeks.png","contentUrl":"https:\/\/python-programs.com\/wp-content\/uploads\/2020\/11\/BTechGeeks.png","width":350,"height":70,"caption":"BTech Geeks"},"image":{"@id":"https:\/\/python-programs.com\/#\/schema\/logo\/image\/"}},{"@type":"WebSite","@id":"https:\/\/python-programs.com\/#website","url":"https:\/\/python-programs.com\/","name":"Python Programs","description":"Python Programs with Examples, How To Guides on Python","publisher":{"@id":"https:\/\/python-programs.com\/#organization"},"potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/python-programs.com\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"en-US"},{"@type":"WebPage","@id":"https:\/\/python-programs.com\/python-dictionary-with-multiple-values-per-key\/#webpage","url":"https:\/\/python-programs.com\/python-dictionary-with-multiple-values-per-key\/","name":"Python: Dictionary with Multiple Values per Key - Python Programs","isPartOf":{"@id":"https:\/\/python-programs.com\/#website"},"datePublished":"2023-10-19T14:22:37+00:00","dateModified":"2023-11-10T06:18:43+00:00","breadcrumb":{"@id":"https:\/\/python-programs.com\/python-dictionary-with-multiple-values-per-key\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/python-programs.com\/python-dictionary-with-multiple-values-per-key\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/python-programs.com\/python-dictionary-with-multiple-values-per-key\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/python-programs.com\/"},{"@type":"ListItem","position":2,"name":"Python: Dictionary with Multiple Values per Key"}]},{"@type":"Article","@id":"https:\/\/python-programs.com\/python-dictionary-with-multiple-values-per-key\/#article","isPartOf":{"@id":"https:\/\/python-programs.com\/python-dictionary-with-multiple-values-per-key\/#webpage"},"author":{"@id":"https:\/\/python-programs.com\/#\/schema\/person\/0f6d731bda7051ce3586f71299f391cd"},"headline":"Python: Dictionary with Multiple Values per Key","datePublished":"2023-10-19T14:22:37+00:00","dateModified":"2023-11-10T06:18:43+00:00","mainEntityOfPage":{"@id":"https:\/\/python-programs.com\/python-dictionary-with-multiple-values-per-key\/#webpage"},"wordCount":388,"commentCount":0,"publisher":{"@id":"https:\/\/python-programs.com\/#organization"},"articleSection":["Python"],"inLanguage":"en-US","potentialAction":[{"@type":"CommentAction","name":"Comment","target":["https:\/\/python-programs.com\/python-dictionary-with-multiple-values-per-key\/#respond"]}]},{"@type":"Person","@id":"https:\/\/python-programs.com\/#\/schema\/person\/0f6d731bda7051ce3586f71299f391cd","name":"Satyabrata Jena","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/python-programs.com\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/c1bf8033ec357d085f41815bee1625cc?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/c1bf8033ec357d085f41815bee1625cc?s=96&d=mm&r=g","caption":"Satyabrata Jena"},"url":"https:\/\/python-programs.com\/author\/satyabrata\/"}]}},"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/python-programs.com\/wp-json\/wp\/v2\/posts\/2991"}],"collection":[{"href":"https:\/\/python-programs.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/python-programs.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/python-programs.com\/wp-json\/wp\/v2\/users\/9"}],"replies":[{"embeddable":true,"href":"https:\/\/python-programs.com\/wp-json\/wp\/v2\/comments?post=2991"}],"version-history":[{"count":2,"href":"https:\/\/python-programs.com\/wp-json\/wp\/v2\/posts\/2991\/revisions"}],"predecessor-version":[{"id":2993,"href":"https:\/\/python-programs.com\/wp-json\/wp\/v2\/posts\/2991\/revisions\/2993"}],"wp:attachment":[{"href":"https:\/\/python-programs.com\/wp-json\/wp\/v2\/media?parent=2991"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/python-programs.com\/wp-json\/wp\/v2\/categories?post=2991"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/python-programs.com\/wp-json\/wp\/v2\/tags?post=2991"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}