Python Program to Merge Two Dictionaries

Write a Python Program to Merge Two Dictionaries with a practical example.

Python Program to Merge Two Dictionaries Example

In this program, we are using the update function to update first_Dict with second_Dict values.

first_Dict = {1: 'apple', 2: 'Banana' , 3: 'Orange'}
second_Dict = { 4: 'Kiwi', 5: 'Mango'}
print("First : ", first_Dict)
print("Second : ", second_Dict)

first_Dict.update(second_Dict)
    
print("\nAfter Concatenating : ")
print(first_Dict)

First :  {1: 'apple', 2: 'Banana', 3: 'Orange'}
Second :  {4: 'Kiwi', 5: 'Mango'}

After Concatenating : 
{1: 'apple', 2: 'Banana', 3: 'Orange', 4: 'Kiwi', 5: 'Mango'}

Python Program to Concatenate Dictionaries Example 2

It is another way to merge in Python. In this program, we are using the dict keyword to create a new Dictionary using first_Dict and ** second_Dict. Here, ** allows you to pass multiple arguments.

first_Dict = {'a': 'apple', 'b': 'Banana' , 'o': 'Orange'}
second_Dict = { 'k': 'Kiwi', 'm': 'Mango'}
print("First : ", first_Dict)
print("Second : ", second_Dict)

print("\nAfter Concatenating : ")
print(dict(first_Dict, **second_Dict) )

output

First :  {'a': 'apple', 'b': 'Banana', 'o': 'Orange'}
Second :  {'k': 'Kiwi', 'm': 'Mango'}

After Concatenating : 
{'a': 'apple', 'b': 'Banana', 'o': 'Orange', 'k': 'Kiwi', 'm': 'Mango'}

Concatenate Two Dictionaries Example

This code is the same as above. However, using Function, we separated the two dictionaries’ concatenation logic in this program.

def Merge_Dictionaries(first, second):
    result = {**first_Dict, **second_Dict}
    return result

first_Dict = {'a': 'apple', 'b': 'Banana' , 'o': 'Orange'}
second_Dict = { 'k': 'Kiwi', 'm': 'Mango'}
print("First Dictionary: ", first_Dict)
print("Second Dictionary: ", second_Dict)

# Concatenate Two Dictionaries 
third_Dict = Merge_Dictionaries(first_Dict, second_Dict)

print("\nAfter Concatenating two Dictionaries : ")
print(third_Dict)