{"id":25927,"date":"2021-12-16T09:20:40","date_gmt":"2021-12-16T03:50:40","guid":{"rendered":"https:\/\/python-programs.com\/?p=25927"},"modified":"2021-12-16T09:20:40","modified_gmt":"2021-12-16T03:50:40","slug":"python-collections-chainmap-method-with-examples","status":"publish","type":"post","link":"https:\/\/python-programs.com\/python-collections-chainmap-method-with-examples\/","title":{"rendered":"Python collections ChainMap() method with Examples"},"content":{"rendered":"<p><strong>ChainMap():<\/strong><\/p>\n<p>Python has a container called &#8220;ChainMap&#8221; that combines many dictionaries into a single unit. ChainMap is part of the &#8220;collections&#8221; module.<\/p>\n<p><strong>Access Operations on ChainMap():<\/strong><\/p>\n<p><strong>keys():<\/strong><\/p>\n<pre> This function displays all of the keys from all of the dictionaries in ChainMap.<\/pre>\n<p><strong>values():<\/strong><\/p>\n<pre> This function displays the values of all dictionaries in ChainMap.<\/pre>\n<p><strong>maps():<\/strong><\/p>\n<pre> This function is used to display all of the dictionaries in ChainMap's keys and values.<\/pre>\n<h2>Collections ChainMap() method with Examples in Python<\/h2>\n<h3>i)Implementing ChainMap<\/h3>\n<p><strong>Approach:<\/strong><\/p>\n<ul>\n<li>Import the chainMap function from collections using the import keyword.<\/li>\n<li>Give the dictionary with some random keys and values and store it in a variable.<\/li>\n<li>Repeat the previous step for as many dictionaries as you choose.<\/li>\n<li>Pass all the above dictionaries as arguments to chainMap() function and store it in a variable.<\/li>\n<li>Print the Above Result.<\/li>\n<li>The Exit of the Program.<\/li>\n<\/ul>\n<p><strong>Below is the Implementation:<\/strong><\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\"># Import the chainMap function from collections using the import keyword.\r\nfrom collections import ChainMap\r\n# Give the dictionary with some random keys and values and store it in a variable.\r\ndictnry1 = {'Good': 100, 'Morning': 448}\r\n# Repeat the previous step for as many dictionaries as you choose.\r\ndictnry2 = {'hello': 1300, 'this': 1448}\r\ndictnry3 = {'is': 1070, 'Python-Programs': 4448}\r\n# Pass all the above dictionaries as arguments to chainMap() function\r\n# and store it in a variable.\r\nreslt = ChainMap(dictnry1, dictnry2, dictnry3)\r\n# Print the Above Result.\r\nprint('The final Result after applying ChainMap : ')\r\nprint(reslt)\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">The final Result after applying ChainMap : \r\nChainMap({'Good': 100, 'Morning': 448}, {'hello': 1300, 'this': 1448}, {'is': 1070, 'Python-Programs': 4448})<\/pre>\n<h4>ii)Implementing ChainMap Access Operations<\/h4>\n<p><strong>Approach:<\/strong><\/p>\n<ul>\n<li>Import the chainMap function from collections using the import keyword.<\/li>\n<li>Give the dictionary with some random keys and values and store it in a variable.<\/li>\n<li>Repeat the previous step for as many dictionaries as you choose.<\/li>\n<li>Pass all the above dictionaries as arguments to chainMap() function and store it in a variable say chainRslt.<\/li>\n<li>Print the ChainMaps using the maps function.<\/li>\n<li>Apply the maps method for the above result(chain) and print it.<\/li>\n<li>To get All the keys in the chain we use the keys() method.<\/li>\n<li>Apply the keys() function for the <strong>chainRslt\u00a0<\/strong>and convert it to a list using the list() function.<\/li>\n<li>Print the Above keys() list.<\/li>\n<li>To get All the values\u00a0 in the chain we use the values() method.<\/li>\n<li>Apply the values () function for the <strong>chainRslt\u00a0<\/strong>and convert it to a list using the list() function.<\/li>\n<li>Print the Above values() list.<\/li>\n<li>The Exit of the Program.<\/li>\n<\/ul>\n<p><strong>Below is the Implementation:<\/strong><\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\"># Import the chainMap function from collections using the import keyword.\r\nfrom collections import ChainMap\r\n# Give the dictionary with some random keys and values and store it in a variable.\r\ndictnry1 = {'hello': 100, 'this': 200}\r\n# Repeat the previous step for as many dictionaries as you choose.\r\ndictnry2 = {'this': 300, 'python-programs': 400}\r\n# Pass all the above dictionaries as arguments to chainMap() function\r\n# and store it in a variable say chainRslt.\r\nchainRslt = ChainMap(dictnry1, dictnry2)\r\n# Print the ChainMaps using the maps function.\r\n# Apply the maps method for the above result(chain) and print it.\r\nprint('The Total Contents in the Chain Map are : ')\r\nprint(chainRslt.maps)\r\n\r\n# To get All the keys in the chain we use the keys() method.\r\n# Apply the keys() function for the chainRslt\r\n# and convert it to a list using the list() function.\r\n# Print the Above keys() list.\r\nprint('The keys present in Chain Map are : ')\r\nprint(list(chainRslt.keys()))\r\n# To get All the values\u00a0 in the chain we use the values() method.\r\n# Apply the values () function for the chainRslt\u00a0and convert it to a list using the list() function.\r\n# Print the Above values() list.\r\nprint('The values present in Chain Map are : ')\r\nprint(list(chainRslt.values()))\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">The Total Contents in the Chain Map are : \r\n[{'hello': 100, 'this': 200}, {'this': 300, 'python-programs': 400}]\r\nThe keys present in Chain Map are : \r\n['python-programs', 'this', 'hello']\r\nThe values present in Chain Map are : \r\n[400, 200, 100]<\/pre>\n<p><strong>Note:<\/strong><\/p>\n<pre>The key \"<\/pre>\n<p><strong>this<\/strong><\/p>\n<pre>\" exists in both dictionaries, but only the first dictionary key\r\nis used as the key value of \"<\/pre>\n<p><strong>this<\/strong><\/p>\n<pre>\". The dictionaries are ordered as they are\r\nprovided into the function.<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>ChainMap(): Python has a container called &#8220;ChainMap&#8221; that combines many dictionaries into a single unit. ChainMap is part of the &#8220;collections&#8221; module. Access Operations on ChainMap(): keys(): This function displays all of the keys from all of the dictionaries in ChainMap. values(): This function displays the values of all dictionaries in ChainMap. maps(): This function &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/python-programs.com\/python-collections-chainmap-method-with-examples\/\"> <span class=\"screen-reader-text\">Python collections ChainMap() method with Examples<\/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 collections ChainMap() method with Examples - 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-collections-chainmap-method-with-examples\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Python collections ChainMap() method with Examples - Python Programs\" \/>\n<meta property=\"og:description\" content=\"ChainMap(): Python has a container called &#8220;ChainMap&#8221; that combines many dictionaries into a single unit. 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