{"id":199805,"date":"2023-12-15T03:40:51","date_gmt":"2023-12-15T03:40:51","guid":{"rendered":"https:\/\/namso-gen.co\/blog\/how-to-append-key-value-in-dictionary-python\/"},"modified":"2023-12-15T03:40:51","modified_gmt":"2023-12-15T03:40:51","slug":"how-to-append-key-value-in-dictionary-python","status":"publish","type":"post","link":"https:\/\/namso-gen.co\/blog\/how-to-append-key-value-in-dictionary-python\/","title":{"rendered":"How to append key-value in dictionary Python?"},"content":{"rendered":"<p>Python dictionaries are mutable data structures that allow us to store key-value pairs. If we want to add a new key-value pair to a dictionary or update an existing key&#8217;s value, we can easily do so using Python&#8217;s built-in methods.<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_62 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title \" >Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/namso-gen.co\/blog\/how-to-append-key-value-in-dictionary-python\/#How_to_append_key-value_in_dictionary_Python\" title=\"How to append key-value in dictionary Python?\">How to append key-value in dictionary Python?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/namso-gen.co\/blog\/how-to-append-key-value-in-dictionary-python\/#How_to_update_an_existing_keys_value_in_a_dictionary\" title=\"How to update an existing key&#8217;s value in a dictionary?\">How to update an existing key&#8217;s value in a dictionary?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/namso-gen.co\/blog\/how-to-append-key-value-in-dictionary-python\/#Can_we_append_multiple_key-value_pairs_at_once_in_a_dictionary\" title=\"Can we append multiple key-value pairs at once in a dictionary?\">Can we append multiple key-value pairs at once in a dictionary?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/namso-gen.co\/blog\/how-to-append-key-value-in-dictionary-python\/#Is_it_possible_to_append_a_key-value_pair_only_if_the_key_does_not_already_exist_in_the_dictionary\" title=\"Is it possible to append a key-value pair only if the key does not already exist in the dictionary?\">Is it possible to append a key-value pair only if the key does not already exist in the dictionary?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/namso-gen.co\/blog\/how-to-append-key-value-in-dictionary-python\/#How_to_append_key-value_in_a_nested_dictionary\" title=\"How to append key-value in a nested dictionary?\">How to append key-value in a nested dictionary?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/namso-gen.co\/blog\/how-to-append-key-value-in-dictionary-python\/#How_to_append_key-value_pairs_from_another_dictionary\" title=\"How to append key-value pairs from another dictionary?\">How to append key-value pairs from another dictionary?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/namso-gen.co\/blog\/how-to-append-key-value-in-dictionary-python\/#Can_we_append_a_key-value_pair_with_a_default_value_if_the_key_is_not_present\" title=\"Can we append a key-value pair with a default value if the key is not present?\">Can we append a key-value pair with a default value if the key is not present?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/namso-gen.co\/blog\/how-to-append-key-value-in-dictionary-python\/#How_to_append_keys_from_a_list_and_assign_a_default_value_to_each_key_in_a_dictionary\" title=\"How to append keys from a list and assign a default value to each key in a dictionary?\">How to append keys from a list and assign a default value to each key in a dictionary?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/namso-gen.co\/blog\/how-to-append-key-value-in-dictionary-python\/#How_to_append_key-value_pairs_in_a_dictionary_using_a_loop\" title=\"How to append key-value pairs in a dictionary using a loop?\">How to append key-value pairs in a dictionary using a loop?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/namso-gen.co\/blog\/how-to-append-key-value-in-dictionary-python\/#How_to_append_key-value_pairs_in_a_dictionary_sorted_by_key\" title=\"How to append key-value pairs in a dictionary sorted by key?\">How to append key-value pairs in a dictionary sorted by key?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/namso-gen.co\/blog\/how-to-append-key-value-in-dictionary-python\/#How_to_append_keys_and_values_from_two_dictionaries_to_create_a_new_dictionary\" title=\"How to append keys and values from two dictionaries to create a new dictionary?\">How to append keys and values from two dictionaries to create a new dictionary?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/namso-gen.co\/blog\/how-to-append-key-value-in-dictionary-python\/#Is_it_possible_to_append_keys_and_values_from_two_dictionaries_without_overwriting_existing_keys\" title=\"Is it possible to append keys and values from two dictionaries without overwriting existing keys?\">Is it possible to append keys and values from two dictionaries without overwriting existing keys?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/namso-gen.co\/blog\/how-to-append-key-value-in-dictionary-python\/#How_to_append_key-value_pairs_with_values_from_a_range_in_a_dictionary\" title=\"How to append key-value pairs with values from a range in a dictionary?\">How to append key-value pairs with values from a range in a dictionary?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/namso-gen.co\/blog\/how-to-append-key-value-in-dictionary-python\/#How_to_append_a_key-value_pair_conditionally_based_on_a_certain_criteria_in_a_dictionary\" title=\"How to append a key-value pair conditionally based on a certain criteria in a dictionary?\">How to append a key-value pair conditionally based on a certain criteria in a dictionary?<\/a><\/li><\/ul><\/nav><\/div>\n<h3><span class=\"ez-toc-section\" id=\"How_to_append_key-value_in_dictionary_Python\"><\/span>How to append key-value in dictionary Python?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>**To append a key-value pair in a dictionary in Python, we can simply use the square brackets notation and assign a value to a new key or update the value of an existing key. Here&#8217;s an example:**<\/p>\n<p>&#8220;`python<br \/>\n# Create a dictionary<br \/>\nmy_dict = {&#8216;name&#8217;: &#8216;John&#8217;, &#8216;age&#8217;: 30}<\/p>\n<p># Append a new key-value pair<br \/>\nmy_dict[&#8216;city&#8217;] = &#8216;New York&#8217;<\/p>\n<p>print(my_dict)<br \/>\n&#8220;`<\/p>\n<p>In this example, we added a new key-value pair &#8216;city&#8217;: &#8216;New York&#8217; to the `my_dict` dictionary.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_to_update_an_existing_keys_value_in_a_dictionary\"><\/span>How to update an existing key&#8217;s value in a dictionary?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>To update the value of an existing key in a dictionary, you can simply access the key and assign a new value to it, like this:<\/p>\n<p>&#8220;`python<br \/>\n# Update the value of an existing key<br \/>\nmy_dict[&#8216;age&#8217;] = 35<\/p>\n<p>print(my_dict)<br \/>\n&#8220;`<\/p>\n<p>In this case, we updated the value of the key &#8216;age&#8217; from 30 to 35.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Can_we_append_multiple_key-value_pairs_at_once_in_a_dictionary\"><\/span>Can we append multiple key-value pairs at once in a dictionary?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Yes, we can append multiple key-value pairs to a dictionary in Python by using the `update()` method. Here&#8217;s how you can do it:<\/p>\n<p>&#8220;`python<br \/>\n# Append multiple key-value pairs<br \/>\nmy_dict.update({&#8216;gender&#8217;: &#8216;Male&#8217;, &#8216;occupation&#8217;: &#8216;Engineer&#8217;})<\/p>\n<p>print(my_dict)<br \/>\n&#8220;`<\/p>\n<p>This will add the new key-value pairs &#8216;gender&#8217;: &#8216;Male&#8217; and &#8216;occupation&#8217;: &#8216;Engineer&#8217; to the dictionary.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Is_it_possible_to_append_a_key-value_pair_only_if_the_key_does_not_already_exist_in_the_dictionary\"><\/span>Is it possible to append a key-value pair only if the key does not already exist in the dictionary?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Yes, we can append a key-value pair conditionally in Python. You can use the `setdefault()` method to add a key-value pair only if the key is not already present in the dictionary. Here&#8217;s an example:<\/p>\n<p>&#8220;`python<br \/>\n# Add a key-value pair only if the key does not exist<br \/>\nmy_dict.setdefault(&#8216;city&#8217;, &#8216;Los Angeles&#8217;)<\/p>\n<p>print(my_dict)<br \/>\n&#8220;`<\/p>\n<p>This will add the key-value pair &#8216;city&#8217;: &#8216;Los Angeles&#8217; to the dictionary only if the key &#8216;city&#8217; is not already present.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_to_append_key-value_in_a_nested_dictionary\"><\/span>How to append key-value in a nested dictionary?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Appending key-value pairs in a nested dictionary is similar to appending key-value pairs in a regular dictionary. You can access the nested dictionary using multiple square brackets notation. Here&#8217;s an example:<\/p>\n<p>&#8220;`python<br \/>\n# Create a nested dictionary<br \/>\nnested_dict = {&#8216;person&#8217;: {&#8216;name&#8217;: &#8216;Alice&#8217;, &#8216;age&#8217;: 25}}<\/p>\n<p># Append a key-value pair to the nested dictionary<br \/>\nnested_dict[&#8216;person&#8217;][&#8216;city&#8217;] = &#8216;San Francisco&#8217;<\/p>\n<p>print(nested_dict)<br \/>\n&#8220;`<\/p>\n<p>This will add the key-value pair &#8216;city&#8217;: &#8216;San Francisco&#8217; to the nested dictionary in the &#8216;person&#8217; key.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_to_append_key-value_pairs_from_another_dictionary\"><\/span>How to append key-value pairs from another dictionary?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>If you have another dictionary with key-value pairs that you want to add to an existing dictionary, you can use the `update()` method. Here&#8217;s an example:<\/p>\n<p>&#8220;`python<br \/>\n# Create another dictionary<br \/>\nnew_dict = {&#8216;weight&#8217;: 150, &#8216;height&#8217;: 5.8}<\/p>\n<p># Append key-value pairs from another dictionary<br \/>\nmy_dict.update(new_dict)<\/p>\n<p>print(my_dict)<br \/>\n&#8220;`<\/p>\n<p>This will merge the key-value pairs from `new_dict` into `my_dict`.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Can_we_append_a_key-value_pair_with_a_default_value_if_the_key_is_not_present\"><\/span>Can we append a key-value pair with a default value if the key is not present?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Yes, you can use the `setdefault()` method to append a key-value pair with a default value if the key is not already present in the dictionary. Here&#8217;s an example:<\/p>\n<p>&#8220;`python<br \/>\n# Append a key-value pair with a default value<br \/>\nmy_dict.setdefault(&#8216;income&#8217;, 50000)<\/p>\n<p>print(my_dict)<br \/>\n&#8220;`<\/p>\n<p>This will add the key-value pair &#8216;income&#8217;: 50000 to the dictionary if the key &#8216;income&#8217; is not already present.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_to_append_keys_from_a_list_and_assign_a_default_value_to_each_key_in_a_dictionary\"><\/span>How to append keys from a list and assign a default value to each key in a dictionary?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>If you have a list of keys that you want to add to a dictionary with a default value for each key, you can use a dictionary comprehension. Here&#8217;s an example:<\/p>\n<p>&#8220;`python<br \/>\n# List of keys<br \/>\nkeys = [&#8216;a&#8217;, &#8216;b&#8217;, &#8216;c&#8217;]<\/p>\n<p># Append keys from a list with a default value<br \/>\ndefault_dict = {key: &#8216;default&#8217; for key in keys}<\/p>\n<p>print(default_dict)<br \/>\n&#8220;`<\/p>\n<p>This will create a dictionary with keys &#8216;a&#8217;, &#8216;b&#8217;, and &#8216;c&#8217; each assigned the default value &#8216;default&#8217;.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_to_append_key-value_pairs_in_a_dictionary_using_a_loop\"><\/span>How to append key-value pairs in a dictionary using a loop?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>If you have multiple key-value pairs to append to a dictionary and want to do it in a loop, you can use a for loop to iterate over the key-value pairs. Here&#8217;s an example:<\/p>\n<p>&#8220;`python<br \/>\n# Key-value pairs to append<br \/>\nnew_pairs = {&#8216;car&#8217;: &#8216;Toyota&#8217;, &#8216;phone&#8217;: &#8216;iPhone&#8217;}<\/p>\n<p># Append key-value pairs using a loop<br \/>\nfor key, value in new_pairs.items():<br \/>\n    my_dict[key] = value<\/p>\n<p>print(my_dict)<br \/>\n&#8220;`<\/p>\n<p>This will add the key-value pairs &#8216;car&#8217;: &#8216;Toyota&#8217; and &#8216;phone&#8217;: &#8216;iPhone&#8217; to the dictionary `my_dict`.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_to_append_key-value_pairs_in_a_dictionary_sorted_by_key\"><\/span>How to append key-value pairs in a dictionary sorted by key?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>If you want to append key-value pairs to a dictionary in a sorted order based on the keys, you can use the `sorted()` function along with a dictionary comprehension. Here&#8217;s an example:<\/p>\n<p>&#8220;`python<br \/>\n# Key-value pairs to append<br \/>\npairs = {&#8216;z&#8217;: 1, &#8216;c&#8217;: 2, &#8216;a&#8217;: 3}<\/p>\n<p># Append key-value pairs sorted by key<br \/>\nsorted_dict = {k: pairs[k] for k in sorted(pairs)}<\/p>\n<p>print(sorted_dict)<br \/>\n&#8220;`<\/p>\n<p>This will create a dictionary with key-value pairs sorted by keys in ascending order.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_to_append_keys_and_values_from_two_dictionaries_to_create_a_new_dictionary\"><\/span>How to append keys and values from two dictionaries to create a new dictionary?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>If you have two dictionaries and want to merge their keys and values into a new dictionary, you can use the `update()` method. Here&#8217;s an example:<\/p>\n<p>&#8220;`python<br \/>\n# Create two dictionaries<br \/>\ndict1 = {&#8216;a&#8217;: 1, &#8216;b&#8217;: 2}<br \/>\ndict2 = {&#8216;c&#8217;: 3, &#8216;d&#8217;: 4}<\/p>\n<p># Merge keys and values from two dictionaries<br \/>\nmerged_dict = dict1.copy()<br \/>\nmerged_dict.update(dict2)<\/p>\n<p>print(merged_dict)<br \/>\n&#8220;`<\/p>\n<p>This will create a new dictionary `merged_dict` with keys and values from `dict1` and `dict2`.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Is_it_possible_to_append_keys_and_values_from_two_dictionaries_without_overwriting_existing_keys\"><\/span>Is it possible to append keys and values from two dictionaries without overwriting existing keys?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>If you want to merge two dictionaries without overwriting existing keys, you can use the `update()` method in combination with a dictionary unpacking operator (**). Here&#8217;s an example:<\/p>\n<p>&#8220;`python<br \/>\n# Merge two dictionaries without overwriting existing keys<br \/>\ndict1 = {&#8216;a&#8217;: 1, &#8216;b&#8217;: 2}<br \/>\ndict2 = {&#8216;b&#8217;: 3, &#8216;c&#8217;: 4}<\/p>\n<p>merged_dict = dict1.copy()<br \/>\nmerged_dict.update({k: v for k, v in dict2.items() if k not in merged_dict})<\/p>\n<p>print(merged_dict)<br \/>\n&#8220;`<\/p>\n<p>This will merge the two dictionaries while ensuring that existing keys are not overwritten in `merged_dict`.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_to_append_key-value_pairs_with_values_from_a_range_in_a_dictionary\"><\/span>How to append key-value pairs with values from a range in a dictionary?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>If you want to append key-value pairs to a dictionary where the values come from a specified range, you can use a dictionary comprehension. Here&#8217;s an example:<\/p>\n<p>&#8220;`python<br \/>\n# Append key-value pairs with values from a range<br \/>\nnum_dict = {str(num): num**2 for num in range(1, 6)}<\/p>\n<p>print(num_dict)<br \/>\n&#8220;`<\/p>\n<p>This will create a dictionary with keys as string representations of numbers from 1 to 5 and values as their squares.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"How_to_append_a_key-value_pair_conditionally_based_on_a_certain_criteria_in_a_dictionary\"><\/span>How to append a key-value pair conditionally based on a certain criteria in a dictionary?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>If you want to append a key-value pair to a dictionary based on a certain condition, you can use an if statement along with dictionary methods. Here&#8217;s an example:<\/p>\n<p>&#8220;`python<br \/>\n# Append a key-value pair conditionally<br \/>\ntemperature = 25<br \/>\nweather_dict = {}<\/p>\n<p>if temperature > 20:<br \/>\n    weather_dict[&#8216;sunny&#8217;] = True<\/p>\n<p>print(weather_dict)<br \/>\n&#8220;`<\/p>\n<p>In this case, the key-value pair &#8216;sunny&#8217;: True will only be added to the dictionary if the temperature is greater than 20.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Python dictionaries are mutable data structures that allow us to store key-value pairs. If we want to add a new key-value pair to a dictionary or update an existing key&#8217;s value, we can easily do so using Python&#8217;s built-in methods. How to append key-value in dictionary Python? **To append a key-value pair in a dictionary &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"How to append key-value in dictionary Python?\" class=\"read-more button\" href=\"https:\/\/namso-gen.co\/blog\/how-to-append-key-value-in-dictionary-python\/#more-199805\">Read more<span class=\"screen-reader-text\">How to append key-value in dictionary Python?<\/span><\/a><\/p>\n","protected":false},"author":51,"featured_media":107420,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86279],"tags":[],"class_list":["post-199805","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-learn","no-featured-image-padding"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>How to append key-value in dictionary Python?<\/title>\n<meta name=\"description\" content=\"Python dictionaries are mutable data structures that allow us to store key-value pairs. 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