{"id":1440,"date":"2022-03-27T19:40:18","date_gmt":"2022-03-27T19:40:18","guid":{"rendered":"https:\/\/visitgis.com\/?p=1440"},"modified":"2022-03-27T19:46:26","modified_gmt":"2022-03-27T19:46:26","slug":"python-dictionary","status":"publish","type":"post","link":"https:\/\/visitgis.com\/python-dictionary\/","title":{"rendered":"Python Dictionary"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\" id=\"content\">What is Python Dictionary?<\/h2>\n\n\n\n<p>A <a href=\"https:\/\/www.python.org\/\">python<\/a> dictionary consists of keys and values. It is helpful to compare a dictionary to a list. Instead of the numerical indexes such as a list, dictionaries have keys. These keys are the keys that are used to access values <a href=\"https:\/\/visitgis.com\/\">within<\/a> a dictionary.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/camo.githubusercontent.com\/ba605d3d5489c200a65be2c797bb9ade2f243d7a34a4a986c0180521656e7b77\/68747470733a2f2f63662d636f75727365732d646174612e73332e75732e636c6f75642d6f626a6563742d73746f726167652e617070646f6d61696e2e636c6f75642f49424d446576656c6f706572536b696c6c734e6574776f726b2d505930313031454e2d536b696c6c734e6574776f726b2f6c6162732f4d6f64756c65253230322f696d616765732f44696374734c6973742e706e67\" alt=\"\"\/><\/figure>\n\n\n\n<p>It is very simple to create a dictionary as placing items inside {} separated by , commas.<\/p>\n\n\n\n<p>Each item will have a KEY and a corresponding VALUE consecutively, it will look like <strong>{Key:Value}.<\/strong> <\/p>\n\n\n\n<p>While the values can be of any data type and can repeat, keys must be of immutable type and must be unique.<\/p>\n\n\n\n<p>In&nbsp;[59]:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\"><em># This is example of Dictonary <\/em>\nDict <strong>=<\/strong> {\"A\" : 1, \"B\" : 2, \"Key3\" : 3, \"Key4\" : 4}\nDict\n<\/pre>\n\n\n\n<p>Out[59]:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">{'A': 1, 'B': 2, 'Key3': 3, 'Key4': 4}<\/pre>\n\n\n\n<p>In&nbsp;[76]:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\"><em>#Access Dictionary Values<\/em>\nDict [\"A\"]\n<\/pre>\n\n\n\n<p>Out[76]:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">1<\/pre>\n\n\n\n<p>Dict [(0,1)]<\/p>\n\n\n\n<h5 class=\"wp-block-heading\" id=\"Each-key-is-separated-from-its-value-by-a-colon-%22:%22.-Commas-separate-the-items,-and-the-whole-dictionary-is-enclosed-in-curly-braces.-An-empty-dictionary-without-any-items-is-written-with-just-two-curly-braces,-like-this-%22%7B%7D%22.\">Each key is separated from its value by a colon &#8220;:&#8221;. Commas separate the items, and the whole dictionary is enclosed in curly braces. An empty python dictionary without any items is written with just two curly braces, like this &#8220;{}&#8221;.<\/h5>\n\n\n\n<p>In&nbsp;[86]:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\"><em># Create a sample dictionary<\/em>\n\nName_Age_Dict <strong>=<\/strong> {\"Umair\": \"1985\", \"Simmi\": \"1980\", \\\n                    \"Moon\": \"1973\", \"Sumaira\": \"1992\", \\\n                    \"Ali\": \"1977\", \"Asghar\": \"1976\", \\\n                    \"Tahira\": \"1977\", \"Fatima\": \"1977\"}\nName_Age_Dict\n<em>#capital letter effects the results.<\/em>\n<\/pre>\n\n\n\n<p>Out[86]:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">{'Umair': '1985',\n 'Simmi': '1980',\n 'Moon': '1973',\n 'Sumaira': '1992',\n 'Ali': '1977',\n 'Asghar': '1976',\n 'Tahira': '1977',\n 'Fatima': '1977'}<\/pre>\n\n\n\n<p>In&nbsp;[87]:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\"><em># Get value by key<\/em>\n\nName_Age_Dict['Tahira'] \n<\/pre>\n\n\n\n<p>Out[87]:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">'1977'<\/pre>\n\n\n\n<p>In&nbsp;[88]:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\"><em># Get all the keys in dictionary<\/em>\n\nName_Age_Dict<strong>.<\/strong>keys() \n<\/pre>\n\n\n\n<p>Out[88]:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">dict_keys(['Umair', 'Simmi', 'Moon', 'Sumaira', 'Ali', 'Asghar', 'Tahira', 'Fatima'])<\/pre>\n\n\n\n<p>In&nbsp;[89]:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\"><em># Get all the values in dictionary<\/em>\n\nName_Age_Dict<strong>.<\/strong>values() \n<\/pre>\n\n\n\n<p>Out[89]:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">dict_values(['1985', '1980', '1973', '1992', '1977', '1976', '1977', '1977'])<\/pre>\n\n\n\n<p>In&nbsp;[91]:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\"><em># Append value with key into dictionary<\/em>\n\nName_Age_Dict ['Tahira'] <strong>=<\/strong> '1992'\nName_Age_Dict\n<\/pre>\n\n\n\n<p>Out[91]:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">{'Umair': '1985',\n 'Simmi': '1980',\n 'Moon': '1973',\n 'Sumaira': '1992',\n 'Ali': '1977',\n 'Asghar': '1976',\n 'Tahira': '1992',\n 'Fatima': '1977',\n 'Graduation': '2007'}<\/pre>\n\n\n\n<p>In&nbsp;[92]:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\"><em># Delete entries by key<\/em>\n\n<strong>del<\/strong>(Name_Age_Dict['Ali'])\nName_Age_Dict\n<\/pre>\n\n\n\n<p>Out[92]:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">{'Umair': '1985',\n 'Simmi': '1980',\n 'Moon': '1973',\n 'Sumaira': '1992',\n 'Asghar': '1976',\n 'Tahira': '1992',\n 'Fatima': '1977',\n 'Graduation': '2007'}<\/pre>\n\n\n\n<p>In&nbsp;[93]:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\"><em>#verify<\/em>\n'Ali' <strong>in<\/strong> Name_Age_Dict\n<\/pre>\n\n\n\n<p>Out[93]:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">False<\/pre>\n\n\n\n<p>In&nbsp;[94]:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\"><em>#verify<\/em>\n'Umair' <strong>in<\/strong> Name_Age_Dict\n<\/pre>\n\n\n\n<p>Out[94]:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">True<\/pre>\n\n\n\n<p>In&nbsp;[13]:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">V<strong>=<\/strong>{'A','B'}\nV<strong>.<\/strong>add('C')\nV\n<\/pre>\n\n\n\n<p>Out[13]:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">{'A', 'B', 'C'}<\/pre>\n\n\n\n<p>In&nbsp;[19]:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">A <strong>=<\/strong> {'1','2'} \na<strong>=<\/strong>set(A)\na\n<\/pre>\n\n\n\n<p>Out[19]:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">{'1', '2'}<\/pre>\n\n\n\n<p>In&nbsp;[20]:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">type(set([1,2,3]))\n<\/pre>\n\n\n\n<p>Out[20]:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">set<\/pre>\n\n\n\n<p>In&nbsp;[21]:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">{'a','b'} <strong>&amp;<\/strong>{'a'}\n<\/pre>\n\n\n\n<p>Out[21]:<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">{'a'}<\/pre>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"methods\">Python Dictionary Methods<\/h2>\n\n\n\n<p>Methods that are available with a dictionary are tabulated below. Some of them have already been used in the above examples.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><th>Method<\/th><th>Description<\/th><\/tr><tr><td><a href=\"https:\/\/visitgis.com\/9-basic-concepts-of-python\/\">clear()<\/a><\/td><td>Removes all items from the dictionary.<\/td><\/tr><tr><td><a href=\"https:\/\/www.programiz.com\/python-programming\/methods\/dictionary\/copy\" rel=\"nofollow\">copy()<\/a><\/td><td>Returns a shallow copy of the dictionary.<\/td><\/tr><tr><td><a href=\"https:\/\/www.programiz.com\/python-programming\/methods\/dictionary\/fromkeys\">fromkeys(seq[, v])<\/a><\/td><td>Returns a new dictionary with keys from <var>seq<\/var> and value equal to <var>v<\/var> (defaults to <code>None<\/code>).<\/td><\/tr><tr><td><a href=\"https:\/\/www.programiz.com\/python-programming\/methods\/dictionary\/get\">get(key[,d])<\/a><\/td><td>Returns the value of the <var>key<\/var>. If the <var>key<\/var> does not exist, returns <var>d<\/var> (defaults to <code>None<\/code>).<\/td><\/tr><tr><td><a href=\"https:\/\/www.programiz.com\/python-programming\/methods\/dictionary\/items\">items()<\/a><\/td><td>Return a new object of the dictionary&#8217;s items in (key, value) format.<\/td><\/tr><tr><td><a href=\"https:\/\/www.programiz.com\/python-programming\/methods\/dictionary\/keys\">keys()<\/a><\/td><td>Returns a new object of the dictionary&#8217;s keys.<\/td><\/tr><tr><td><a href=\"https:\/\/www.programiz.com\/python-programming\/methods\/dictionary\/pop\">pop(key[,d])<\/a><\/td><td>Removes the item with the <var>key<\/var> and returns its value or <var>d<\/var> if <var>key<\/var> is not found. If <var>d<\/var> is not provided and the <var>key<\/var> is not found, it raises <code>KeyError<\/code>.<\/td><\/tr><tr><td><a href=\"https:\/\/www.programiz.com\/python-programming\/methods\/dictionary\/popitem\">popitem()<\/a><\/td><td>Removes and returns an arbitrary item (<strong>key, value<\/strong>). Raises <code>KeyError<\/code> if the dictionary is empty.<\/td><\/tr><tr><td><a href=\"https:\/\/www.programiz.com\/python-programming\/methods\/dictionary\/setdefault\">setdefault(key[,d])<\/a><\/td><td>Returns the corresponding value if the <var>key<\/var> is in the dictionary. If not, inserts the <var>key<\/var> with a value of <var>d<\/var> and returns <var>d<\/var> (defaults to <code>None<\/code>).<\/td><\/tr><tr><td><a href=\"https:\/\/www.programiz.com\/python-programming\/methods\/dictionary\/update\">update([other])<\/a><\/td><td>Updates the dictionary with the key\/value pairs from <var>other<\/var>, overwriting existing keys.<\/td><\/tr><tr><td><a href=\"https:\/\/www.programiz.com\/python-programming\/methods\/dictionary\/values\">values()<\/a><\/td><td>Returns a new object of the dictionary&#8217;s values<\/td><\/tr><\/tbody><\/table><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>What is Python Dictionary? A python dictionary consists of keys and values. It is helpful to compare a dictionary to a list. Instead of the numerical indexes such as a list, dictionaries have keys. These keys are the keys that are used to access values within a dictionary. It is very simple to create a [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1485,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_lmt_disableupdate":"","_lmt_disable":"","site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[129,58],"tags":[116,120,133,130,131,134,135,132],"class_list":["post-1440","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-programming","category-gis-tutorials","tag-python","tag-python-dictionary","tag-python-dictionary-add-item","tag-python-dictionary-append","tag-python-dictionary-keys","tag-python-dictionary-methods","tag-python-dictionary-pop","tag-python-dictionary-update"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Python Dictionary - VGIS<\/title>\n<meta name=\"description\" content=\"A python dictionary consists of keys and values. 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