{"id":3420,"date":"2022-09-23T12:30:59","date_gmt":"2022-09-23T07:00:59","guid":{"rendered":"https:\/\/btechgeeks.com\/?p=3420"},"modified":"2022-09-23T12:40:27","modified_gmt":"2022-09-23T07:10:27","slug":"remove-a-key-from-dictionary-in-python-del-vs-dict-pop-vs-comprehension","status":"publish","type":"post","link":"https:\/\/btechgeeks.com\/remove-a-key-from-dictionary-in-python-del-vs-dict-pop-vs-comprehension\/","title":{"rendered":"Python dict pop vs del dict &#8211; Remove a key from Dictionary in Python | del vs dict.pop() vs comprehension"},"content":{"rendered":"<h2>How to remove a key from dictionary using del vs dict.pop() vs comprehension in python ?<\/h2>\n<p><strong>Python dict pop vs del dict: <\/strong>As we know, Dictionary plays an important role in python data structure.<\/p>\n<ul>\n<li>The elements are written with in { }curly brackets, having keys and values.<\/li>\n<li>Each key-value pair mapped with the key to its related value.<\/li>\n<li>In Dictionaries duplicates are not allowed.<\/li>\n<\/ul>\n<pre>Syntax : mydict = {key1: value1, key2: value2}<\/pre>\n<p>In this article, we will discuss about different ways to remove a key from dictionary in python.<\/p>\n<p>Let us assume we have a dictionary with correspondent keys and values:<\/p>\n<pre>#dictionary with keys with their correspondent values\r\ntest_dict= { 'Ram': 32, 'Sagar': 36, 'Dhruv': 45}<\/pre>\n<p>Now we will see different method to delete an key from dictionary :<\/p>\n<ul>\n<li><a href=\"https:\/\/btechgeeks.com\/python-iterate-over-dictionary-and-remove-items\/\">Python: Iterate over Dictionary and Remove items<\/a><\/li>\n<li><a href=\"https:\/\/btechgeeks.com\/python-iterate-over-dictionary-with-list-values\/\">Python: Iterate over Dictionary with List Values<\/a><\/li>\n<li><a href=\"https:\/\/btechgeeks.com\/python-program-to-count-the-number-of-each-vowel\/\">Python Program to Count the Number of Each Vowel<\/a><\/li>\n<\/ul>\n<h3>Method -1 : Using dict.pop( ) method :<\/h3>\n<p><strong>Python dict pop: <\/strong>This <code>pop()<\/code> method is used to delete a key and its value in its place. The advantage over using del is that it provides a mechanism to print the desired value if you try to remove a non-existent spelling. Secondly it also returns the value of the key that is removed as well as performs a simple delete operation.<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">#Program :\r\n\r\n#dictionary test_dict\r\ntest_dict= { 'Ram': 32, 'Sagar': 36, 'Dhruv': 45}\r\n#this key will be deleted\r\nkey_to_be_deleted = 'Sagar'\r\n# As 'Sagar' key is present in dictionary, so pop() will delete\r\n# its entry and return its value\r\nresult = test_dict.pop(key_to_be_deleted, None)\r\nprint(\"Deleted item's value = \", result)\r\nprint(\"Updated Dictionary :\", test_dict)\r\n<\/pre>\n<pre>Output\r\nDeleted item's value = 36\r\nUpdated Dictionary : {'Ram': 32, 'Dhruv': 45}<\/pre>\n<p><strong>In case the key does not exist :<\/strong><\/p>\n<p><strong>Python pop vs del: <\/strong>We use try\/except method to avoid error. We know key <code>\u2018Soni\u2019<\/code> is not in dictionary. So, an error will generate. To avoid error try\/except method will be used.<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">#Program :\r\n\r\n#dictionary test_dict\r\ntest_dict= { 'Ram': 32, 'Sagar': 36, 'Dhruv': 45}\r\n\r\n#Deleting key which does not exist i.e Soni\r\nkey_to_be_deleted = 'Soni'\r\ntry:\r\n    test_dict.pop(key_to_be_deleted)\r\nexcept KeyError:\r\n    print('That Key is not in the dictionary')<\/pre>\n<pre>Output :\r\nThat is not present in the dictionary<\/pre>\n<h3>Method-2 : Using items() &amp; for loop :<\/h3>\n<p><strong>Python dict pop: <\/strong>By using <code>item() method<\/code> and <code>for loop<\/code> we will iterate over the dictionary. When the key that will be deleted will be matched then delete that key.<\/p>\n<p>Let&#8217;s see a program how it&#8217;s implemented.<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">#Program :\r\n\r\n# Dictionary with keys and values\r\ntest_dict= { 'Ram': 32, 'Sagar': 36, 'Dhruv': 45}\r\n# key that to be deleted\r\nkey_to_be_deleted = 'Dhruv'\r\nnew_dict = {}\r\n#using for loop \r\n#Iterate one by one key#If found that key then delete\r\nfor key, value in test_dict.items():\r\n if key is not key_to_be_deleted:\r\n  new_dict[key] = value\r\ntest_dict = new_dict\r\nprint(test_dict)\r\n<\/pre>\n<pre>Output\r\n{'Ram': 32, 'Dhruv': 45}<\/pre>\n<p>Here for deletion we used for loop and We created a new temporary dictionary and then duplicated it for all key-value pairs in the original dictionary. During iteration, we copy the key and value pair into a new temporary dictionary only if the key is not equal to the key to be deleted. Once the duplication finished, we copied the contents of the new temporary dictionary into the original dictionary.<\/p>\n<h3>Method-3: Using items() &amp; Dictionary Comprehension :<\/h3>\n<p><strong>Dict pop python: <\/strong>Utilizing the logic of the above example we use items() &amp; dictionary comprehension.<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">#Program :\r\n\r\n# Dictionary with keys and values\r\ntest_dict= { 'Ram': 32, 'Sagar': 36, 'Dhruv': 45}\r\n# key that to be deleted\r\nkey_to_be_deleted = 'Ram'\r\ntest_dict = {key: value for key, value\\\r\n                  in test_dict.items()\\\r\n                  if key is not key_to_be_deleted}\r\nprint(test_dict)<\/pre>\n<pre>Output:\r\n{'Ram': 32, 'Dhruv': 45}<\/pre>\n<h3>Method-4: Using del keyword :<\/h3>\n<p><strong>Remove from dict python: <\/strong>We can use the <code>del statement<\/code> to delete a key-value pair from the dictionary regarding on the key.<\/p>\n<pre>Syntax : del dict[key]<\/pre>\n<p>Let&#8217;s use it-<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">#Program :\r\n\r\n# Dictionary of keys &amp;values\r\ntest_dict= { 'Ram': 32, 'Sagar': 36, 'Dhruv': 45}\r\n# Deleting an item from dictionary using del\r\ndel test_dict['Dhruv']\r\nprint(test_dict)<\/pre>\n<pre>Output:\r\n{'Sagar': 36, 'Ram':32}<\/pre>\n<p><strong>In case the key does not exist :<\/strong><br \/>\nSuppose we want to delete key<code> 'Soni'<\/code>, which does not exist then we can use <code>try-except<\/code> to avoid any exception.<\/p>\n<p>Let&#8217;s see the implementation of it.<\/p>\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\">#Program :\r\n\r\n# Dictionary of keys &amp;values\r\ntest_dict= { 'Ram': 32, 'Sagar': 36, 'Dhruv': 45}\r\n# If key exist in dictionary then delete it using del.\r\nkey_to_be_deleted = 'Soni'\r\ntry:\r\n del test_dict[key_to_be_deleted]\r\nexcept KeyError:\r\n print('That key is not present in the dictionary')<\/pre>\n<pre>Output:\r\nThat key is not present in the dictionary<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>How to remove a key from dictionary using del vs dict.pop() vs comprehension in python ? Python dict pop vs del dict: As we know, Dictionary plays an important role in python data structure. The elements are written with in { }curly brackets, having keys and values. 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The list of key value pairs in curly braces that is\u2026","rel":"","context":"In &quot;Python&quot;","img":{"alt_text":"Convert Dictionary Values to a List in Python","src":"https:\/\/i1.wp.com\/btechgeeks.com\/wp-content\/uploads\/2021\/05\/Convert-Dictionary-Values-to-a-List-in-Python.png?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":5336,"url":"https:\/\/btechgeeks.com\/python-how-to-iterate-over-nested-dictionary-dict-of-dicts\/","url_meta":{"origin":3420,"position":3},"title":"Iterate through nested dictionary python - Python: How to Iterate over Nested Dictionary -Dict of Dicts","date":"September 19, 2022","format":false,"excerpt":"Iterate through nested dictionary python: 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. To an infinite depth, a dictionary may include another dictionary, which can\u2026","rel":"","context":"In &quot;Python&quot;","img":{"alt_text":"How to Iterate over Nested Dictionary -Dict of Dicts","src":"https:\/\/i0.wp.com\/btechgeeks.com\/wp-content\/uploads\/2021\/05\/How-to-Iterate-over-Nested-Dictionary-Dict-of-Dicts.png?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":2334,"url":"https:\/\/btechgeeks.com\/dictionaries-in-python\/","url_meta":{"origin":3420,"position":4},"title":"Dictionaries in Python","date":"June 23, 2022","format":false,"excerpt":"Python Dictionary: Dictionaries are Python's implementation of a data structure that is more generally known as an associative array. A dictionary consists of a collection of key-value pairs. Each key-value pair maps the key to its associated value.Keys are unique within a dictionary while values may not be. Creating a\u2026","rel":"","context":"In &quot;Python&quot;","img":{"alt_text":"Delete Dictionary Elements","src":"https:\/\/i1.wp.com\/btechgeeks.com\/wp-content\/uploads\/2021\/04\/Delete-Dictionary-Elements.png?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]},{"id":5885,"url":"https:\/\/btechgeeks.com\/convert-dictionary-keys-to-a-list-in-python\/","url_meta":{"origin":3420,"position":5},"title":"Convert dict keys to list python - Convert Dictionary keys to a List in Python","date":"September 19, 2022","format":false,"excerpt":"Convert dict keys to list python: In Python, dictionaries are useful data structures that use keys for indexing. They are an unordered sequence of items (key-value pairs), so the order does not matter. The keys are not able to be changed. Dictionaries, like lists, can hold a variety of data\u2026","rel":"","context":"In &quot;Python&quot;","img":{"alt_text":"Convert Dictionary keys to a List","src":"https:\/\/i1.wp.com\/btechgeeks.com\/wp-content\/uploads\/2021\/05\/Convert-Dictionary-keys-to-a-List.png?resize=350%2C200&ssl=1","width":350,"height":200},"classes":[]}],"_links":{"self":[{"href":"https:\/\/btechgeeks.com\/wp-json\/wp\/v2\/posts\/3420"}],"collection":[{"href":"https:\/\/btechgeeks.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/btechgeeks.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/btechgeeks.com\/wp-json\/wp\/v2\/users\/9"}],"replies":[{"embeddable":true,"href":"https:\/\/btechgeeks.com\/wp-json\/wp\/v2\/comments?post=3420"}],"version-history":[{"count":7,"href":"https:\/\/btechgeeks.com\/wp-json\/wp\/v2\/posts\/3420\/revisions"}],"predecessor-version":[{"id":38261,"href":"https:\/\/btechgeeks.com\/wp-json\/wp\/v2\/posts\/3420\/revisions\/38261"}],"wp:attachment":[{"href":"https:\/\/btechgeeks.com\/wp-json\/wp\/v2\/media?parent=3420"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/btechgeeks.com\/wp-json\/wp\/v2\/categories?post=3420"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/btechgeeks.com\/wp-json\/wp\/v2\/tags?post=3420"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}