Add a key:value pair to dictionary in Python

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.

Code #1: Using Subscript notation

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

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# 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)

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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











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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)  



















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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











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# 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)  



















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Output:


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



          
          
          
          

            

    

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