Skip to content

Add Same Key in Python Dictionary

Add a key value pair to Dictionary in Python

Last Updated : 23 Jan, 2025

The task of adding a key-value pair to a dictionary in Python involves inserting new pairs or updating existing ones. This operation allows us to expand the dictionary by adding new entries or modify the value of an existing key.

For example, starting with dictionary d = {‘key1’: ‘geeks’, ‘key2’: ‘for’}, we add multiple key-value pairs at once: ‘key3’: ‘Geeks’, ‘key4’: ‘is’, ‘key5’: ‘portal’, and ‘key6’: ‘Computer’. After the update, the dictionary becomes {‘key1’: ‘geeks’, ‘key2’: ‘for’, ‘key3’: ‘Geeks’, ‘key4’: ‘is’, ‘key5’: ‘portal’, ‘key6’: ‘Computer’}.

Using update()

update() is used when we need to add multiple key-value pairs or modify existing ones. We can pass another dictionary or an iterable of key-value pairs to this method and it will add the new pairs or update the existing keys.

Python

d = {'key1': 'geeks', 'key2': 'for'}  d.update({'key3': 'Geeks', 'key4': 'is', 'key5': 'portal', 'key6': 'Computer'}) print(d)

Output

{'key1': 'geeks', 'key2': 'for', 'key3': 'Geeks', 'key4': 'is', 'key5': 'portal', 'key6': 'Computer'}

Explanation: update() adds key-value pairs to d, updating existing keys and adding new ones .

Table of Content

Using square brackets []

This is the simplest way to add or update a key-value pair in a dictionary. We access the dictionary by specifying the key inside square brackets and assign the corresponding value. If the key doesn’t exist, it will be added to the dictionary.

Python

d = {'key1': 'geeks', 'key2': 'for'}  d['key3'] = 'Geeks' d['key4'] = 'is' d['key5'] = 'portal' d['key6'] = 'Computer' print(d)

Output

{'key1': 'geeks', 'key2': 'for', 'key3': 'Geeks', 'key4': 'is', 'key5': 'portal', 'key6': 'Computer'}

Explanation: It adds new key-value pairs to d using direct assignment.

Using dictionary unpacking

dictionary unpacking allows us to merge dictionaries or add new key-value pairs in a concise way. By using the unpacking operator **, we can merge an existing dictionary with new items in a single statement.

Python

d = {'key1': 'geeks', 'key2': 'for'}  d = {**d, 'key3': 'Geeks', 'key4': 'is', 'key5': 'portal', 'key6': 'Computer'} print(d)

Output

{'key1': 'geeks', 'key2': 'for', 'key3': 'Geeks', 'key4': 'is', 'key5': 'portal', 'key6': 'Computer'}

Explanation: **d unpacks the original dictionary d , and new key-value pairs are added.

Using dict()

dict() allows us to create a new dictionary by combining existing ones with new key-value pairs. This method is useful when we want to create a new dictionary that includes both the original and new items.

Python

d = {'key1': 'geeks', 'key2': 'for'} d = dict(d, key3='Geeks', key4='is', key5='portal', key6='Computer') print(d)

Output

{'key1': 'geeks', 'key2': 'for', 'key3': 'Geeks', 'key4': 'is', 'key5': 'portal', 'key6': 'Computer'}

Explanation: dict(d) creates a new dictionary from d and new key-value pairs are added using keyword arguments.

Add Same Key in Python Dictionary

S

Shivam_k

Improve

Article Tags :

Practice Tags :

Similar Reads

Python Dictionary Add Value to Existing Key

The task of adding a value to an existing key in a Python dictionary involves modifying the value associated with a key that is already present. Unlike adding new key-value pairs, this operation focuses on updating the value of an existing key, allowing us to increment, concatenate or otherwise adju

Add Same Key in Python Dictionary

The task of adding the same key in a Python dictionary involves updating the value of an existing key rather than inserting a new key-value pair. Since dictionaries in Python do not allow duplicate keys, adding the same key results in updating the value of that key. For example, consider a dictionar

Python - Add Values to Dictionary of List

A dictionary of lists allows storing grouped values under specific keys. For example, in a = {'x': [10, 20]}, the key 'x' maps to the list [10, 20]. To add values like 30 to this list, we use efficient methods to update the dictionary dynamically. Letâ€™s look at some commonly used methods to efficien

Python Print Dictionary Keys and Values

When working with dictionaries, it's essential to be able to print their keys and values for better understanding and debugging. In this article, we'll explore different methods to Print Dictionary Keys and Values. Example: Using print() Method [GFGTABS] Python my_dict = {'a': 1, 'b'

Python - Mapping Key Values to Dictionary

We are given two list and we need to map key to values of another list so that it becomes dictionary. For example, we are given two list k = ['a', 'b', 'c'] and v = [1, 2, 3] we need to map the keys of list k to the values of list v so that the resultant output should be {'a': 1, 'b': 2, 'c': 3}. Us

Add Key to Dictionary Python Without Value

In Python, dictionaries are a versatile and widely used data structure that allows you to store and organize data in key-value pairs. While adding a key to a dictionary is straightforward when assigning a value, there are times when you may want to add a key without specifying a value initially. In

How to Add Values to Dictionary in Python

The task of adding values to a dictionary in Python involves inserting new key-value pairs or modifying existing ones. A dictionary stores data in key-value pairs, where each key must be unique. Adding values allows us to expand or update the dictionary's contents, enabling dynamic manipulation of d

Append a Value to a Dictionary Python

The task of appending a value to a dictionary in Python involves adding new data to existing key-value pairs or introducing new key-value pairs into the dictionary. This operation is commonly used when modifying or expanding a dictionary with additional information. For example, consider the diction

Dictionary keys as a list in Python

In Python, we will encounter some situations where we need to extract the keys from a dictionary as a list. In this article, we will explore various easy and efficient methods to achieve this. Using list() The simplest and most efficient way to convert dictionary keys to lists is by using a built-in

Python Program to print sum of all key value pairs in a Dictionary

Given a dictionary arr consisting of N items, where key and value are both of integer type, the task is to find the sum of all key value pairs in the dictionary. Examples: Input: arr = {1: 10, 2: 20, 3: 30}Output: 11 22 33Explanation: Sum of key and value of the first item in the dictionary = 1 + 10