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Python Program to Merge Two Dictionaries

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In this article, we will show you, How to write a Python Program to Merge Two Dictionaries with practical example. Before you start, please refer Dictionary article to understand everything about Dictionaries.

Python Program to Merge Two Dictionaries Example

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

# Python Program to Concatenate Two Dictionaries

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

# Concatenate Two Dictionaries in Python
first_Dict.update(second_Dict)
    
print("\nAfter Concatenating two Dictionaries : ")
print(first_Dict)

OUTPUT

Python Program to Merge Two Dictionaries 1

Python Program to Concatenate Dictionaries Example 2

This is an another way to merge dictionaries in Python. In this program, we are using dict to create a new dictionary using first_Dict and ** second_Dict. Here, ** allows you to pass multiple arguments.

# Python Program to Concatenate Two Dictionaries

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 in Python
print("\nAfter Concatenating two Dictionaries : ")
print(dict(first_Dict, **second_Dict) )

OUTPUT

Python Program to Merge Two Dictionaries 2

Python Program to Concatenate Two Dictionaries Example 3

This program is same as above. However, we separated the logic using Function concept.

# Python Program to Concatenate Two Dictionaries

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 in Python
third_Dict = Merge_Dictionaries(first_Dict, second_Dict)

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

OUTPUT

Python Program to Merge Two Dictionaries 3