{"id":25911,"date":"2021-12-16T09:20:34","date_gmt":"2021-12-16T03:50:34","guid":{"rendered":"https:\/\/python-programs.com\/?p=25911"},"modified":"2021-12-16T09:20:34","modified_gmt":"2021-12-16T03:50:34","slug":"python-collections-ordereddict-method-with-examples","status":"publish","type":"post","link":"https:\/\/python-programs.com\/python-collections-ordereddict-method-with-examples\/","title":{"rendered":"Python collections OrderedDict() Method with Examples"},"content":{"rendered":"<p><strong>OrderedDict:<\/strong><\/p>\n<p>An OrderedDict is a subclass of dictionary that remembers the order in which keys were first placed. The only distinction between dict() and OrderedDict() is:<\/p>\n<p>The sequence in which the keys are inserted is preserved by OrderedDict. A standard dict does not keep track of the insertion order, therefore iterating through it returns the items in any order. OrderedDict, on the other hand, remembers the order in which the elements are placed.<\/p>\n<h2>Collections OrderedDict() Method with Examples in Python<\/h2>\n<h4>i)OrderedDict vs Normal Dictionary Example<\/h4>\n<p><strong>Approach:<\/strong><\/p>\n<ul>\n<li>Import the OrderedDict from collections using the import keyword.<\/li>\n<li>Take a Empty dictionary using {} or dict() (Normal Dictionary).<\/li>\n<li>Give some random keys and values for the above dictionary.<\/li>\n<li>Take another dictionary using OrderedDict() (Ordered Dictionary).<\/li>\n<li>Give the same keys and values for this dictionary.<\/li>\n<li>Print the Normal Dictionary and Ordered Dictionary keys and Values.<\/li>\n<li>We can see that the ordered is not maintained in Normal Dictionary but ordered is maintained in Ordered Dictionary.<\/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 OrderedDict from collections using the import keyword.\r\nfrom collections import OrderedDict\r\n# Take a Empty dictionary using {} or dict() (Normal Dictionary).\r\nnormalDict = {}\r\n# Give some random keys and values for the above dictionary.\r\nnormalDict['hello'] = 100\r\nnormalDict['this'] = 400\r\nnormalDict['is'] = 500\r\nnormalDict['Python-Programs'] = 900\r\n# Take another dictionary using OrderedDict() (Ordered Dictionary).\r\norderedDictionary = OrderedDict()\r\n# Give the same keys and values for this dictionary.\r\norderedDictionary['hello'] = 100\r\norderedDictionary['this'] = 400\r\norderedDictionary['is'] = 500\r\norderedDictionary['Python-Programs'] = 900\r\n# Print the Normal Dictionary and Ordered Dictionary keys and Values.\r\n# We can see that the ordered is not maintained in Normal Dictionary but ordered is maintained in Ordered Dictionary.\r\nprint('Normal Dictionary :')\r\nprint(normalDict)\r\nprint('Ordered Dictionary : ')\r\nprint(orderedDictionary)\r\n<\/pre>\n<p>Output:<\/p>\n<pre id=\"codeOutputPre\">Normal Dictionary :\r\n{'hello': 100, 'is': 500, 'this': 400, 'Python-Programs': 900}\r\nOrdered Dictionary : \r\nOrderedDict([('hello', 100), ('this', 400), ('is', 500), ('Python-Programs', 900)])<\/pre>\n<h4>ii)What happens if we change\/modify key or value in Ordered Dictionary?<\/h4>\n<p>In OrderedDict, if the value of a key is altered, the key&#8217;s position remains unchanged.<\/p>\n<p><strong>Approach:<\/strong><\/p>\n<ul>\n<li>Import the OrderedDict from collections using the import keyword.<\/li>\n<li>Take a dictionary using OrderedDict() (Ordered Dictionary).<\/li>\n<li>Give some random keys and values for this dictionary.<\/li>\n<li>Print the Dictionary before modification<\/li>\n<li>Modify any key in the Above Dictionary by changing its value.<\/li>\n<li>Print the Dictionary after modification<\/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 OrderedDict from collections using the import keyword.\r\nfrom collections import OrderedDict\r\n\r\n# Take a dictionary using OrderedDict() (Ordered Dictionary).\r\norderedDictionary = OrderedDict()\r\n# Give some random keys and values for this dictionary.\r\norderedDictionary['hello'] = 100\r\norderedDictionary['this'] = 400\r\norderedDictionary['is'] = 500\r\norderedDictionary['Python-Programs'] = 900\r\n# Print the Dictionary before modification\r\nprint('The given Dictionary Before Modification : ')\r\nfor key, value in orderedDictionary.items():\r\n    print(key, value)\r\n# Modify any key in the Above Dictionary by changing its value.\r\norderedDictionary['is'] = 1929\r\n# Print the Dictionary after modification\r\nprint('The given Dictionary After Modification : ')\r\nfor key, value in orderedDictionary.items():\r\n    print(key, value)\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">The given Dictionary Before Modification : \r\nhello 100\r\nthis 400\r\nis 500\r\nPython-Programs 900\r\nThe given Dictionary After Modification : \r\nhello 100\r\nthis 400\r\nis 1929\r\nPython-Programs 900<\/pre>\n<p><strong>Explanation:<\/strong><\/p>\n<pre>Here we can see that the order remains unchanged.<\/pre>\n<h4>iii)What if we remove and reinsert the same key in Ordered Dictionary?<\/h4>\n<p>As OrderedDict maintains the order of insertion, deleting and re-inserting the same key will move it to the rear.<\/p>\n<p><strong>Approach:<\/strong><\/p>\n<ul>\n<li>Import the OrderedDict from collections using the import keyword.<\/li>\n<li>Take a dictionary using OrderedDict() (Ordered Dictionary).<\/li>\n<li>Give some random keys and values for this dictionary.<\/li>\n<li>Print the Dictionary before Deleting the key.<\/li>\n<li>Remove Some Random Key from the above dictionary using the pop() method.<\/li>\n<li>Print the Dictionary after Deleting the key.<\/li>\n<li>Insert the same key again to the Ordered Dictionary<\/li>\n<li>Print the Dictionary after Reinserting the same key.<\/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 OrderedDict from collections using the import keyword.\r\nfrom collections import OrderedDict\r\n\r\n# Take a dictionary using OrderedDict() (Ordered Dictionary).\r\norderedDictionary = OrderedDict()\r\n# Give some random keys and values for this dictionary.\r\norderedDictionary['hello'] = 100\r\norderedDictionary['this'] = 400\r\norderedDictionary['is'] = 500\r\norderedDictionary['Python-Programs'] = 900\r\n# Print the Dictionary before Deleting the key.\r\nprint('The given Dictionary Before Deletion : ')\r\nfor key, value in orderedDictionary.items():\r\n    print(key, \"-&gt;\", value)\r\n# Remove Some Random Key from the above dictionary using the pop() method.\r\norderedDictionary.pop('is')\r\n# Print the Dictionary after Deleting the key.\r\nprint('The given Dictionary After Deletion : ')\r\nfor key, value in orderedDictionary.items():\r\n    print(key, \"-&gt;\", value)\r\n# Insert the same key again to the Ordered Dictionary\r\norderedDictionary['is'] = 500\r\n# Print the Dictionary after Reinserting the same key.\r\nprint('The given Dictionary After Reinserting the same key : ')\r\nfor key, value in orderedDictionary.items():\r\n    print(key, \"-&gt;\", value)\r\n<\/pre>\n<p><strong>Output:<\/strong><\/p>\n<pre id=\"codeOutputPre\">The given Dictionary Before Deletion : \r\nhello -&gt; 100\r\nthis -&gt; 400\r\nis -&gt; 500\r\nPython-Programs -&gt; 900\r\nThe given Dictionary After Deletion : \r\nhello -&gt; 100\r\nthis -&gt; 400\r\nPython-Programs -&gt; 900\r\nThe given Dictionary After Reinserting the same key : \r\nhello -&gt; 100\r\nthis -&gt; 400\r\nPython-Programs -&gt; 900\r\nis -&gt; 500<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>OrderedDict: An OrderedDict is a subclass of dictionary that remembers the order in which keys were first placed. The only distinction between dict() and OrderedDict() is: The sequence in which the keys are inserted is preserved by OrderedDict. A standard dict does not keep track of the insertion order, therefore iterating through it returns the &hellip;<\/p>\n<p class=\"read-more\"> <a class=\"\" href=\"https:\/\/python-programs.com\/python-collections-ordereddict-method-with-examples\/\"> <span class=\"screen-reader-text\">Python collections OrderedDict() 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 OrderedDict() 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-ordereddict-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 OrderedDict() Method with Examples - Python Programs\" \/>\n<meta property=\"og:description\" content=\"OrderedDict: An OrderedDict is a subclass of dictionary that remembers the order in which keys were first placed. 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