Skip to content
Related Articles

Related Articles

Improve Article
Save Article
Like Article

Add a key:value pair to dictionary in Python

  • Last Updated : 14 Jan, 2019

Dictionary in Python is an unordered collection of data values, used to store data values like a map, which unlike other Data Types that hold only single value as an element, Dictionary holds key:value pair.

While using Dictionary, sometimes, we need to add or modify the key/value inside the dictionary. Let’s see how to add a key:value pair to dictionary in Python.

 Attention geek! Strengthen your foundations with the Python Programming Foundation Course and learn the basics.  

To begin with, your interview preparations Enhance your Data Structures concepts with the Python DS Course. And to begin with your Machine Learning Journey, join the Machine Learning - Basic Level Course

Code #1: Using Subscript notation



This method will create a new key:value pair on a dictionary by assigning a value to that key.




# Python program to add a key:value pair to dictionary
  
dict = {'key1':'geeks', 'key2':'for'
print("Current Dict is: ", dict
    
# using the subscript notation 
# Dictionary_Name[New_Key_Name] = New_Key_Value 
  
dict['key3'] = 'Geeks'
dict['key4'] = 'is'
dict['key5'] = 'portal'
dict['key6'] = 'Computer'
print("Updated Dict is: ", dict)
Output:

Current Dict is: {‘key2’: ‘for’, ‘key1’: ‘geeks’}
Updated Dict is: {‘key3’: ‘Geeks’, ‘key5’: ‘portal’, ‘key6’: ‘Computer’, ‘key4’: ‘is’, ‘key1’: ‘geeks’, ‘key2’: ‘for’}

Code #2: Using update() method




dict = {'key1':'geeks', 'key2':'for'
print("Current Dict is: ", dict
  
# adding dict1 (key3, key4 and key5) to dict 
dict1 = {'key3':'geeks', 'key4':'is', 'key5':'fabulous'
dict.update(dict1) 
  
# by assigning 
dict.update(newkey1 ='portal'
print(dict
Output:

Current Dict is: {‘key2’: ‘for’, ‘key1’: ‘geeks’}
{‘newkey1’: ‘portal’, ‘key4’: ‘is’, ‘key2’: ‘for’, ‘key1’: ‘geeks’, ‘key5’: ‘fabulous’, ‘key3’: ‘geeks’}

Code #3: Taking Key:value as input




# Let's add key:value to a dictionary, the functional way 
  
# Create your dictionary class 
class my_dictionary(dict): 
  
    # __init__ function 
    def __init__(self): 
        self = dict() 
          
    # Function to add key:value 
    def add(self, key, value): 
        self[key] = value 
  
# Main Function 
dict_obj = my_dictionary() 
  
# Taking input key = 1, value = Geek
dict_obj.key = input("Enter the key: ")
dict_obj.value = input("Enter the value: ")
  
dict_obj.add(dict_obj.key, dict_obj.value) 
dict_obj.add(2, 'forGeeks'
  
print(dict_obj) 

Output:

 {'1': 'Geeks', 2: 'forGeeks'}



My Personal Notes arrow_drop_up
Recommended Articles
Page :