How to Merge Two Dictionaries in Python

How to Merge Two Dictionaries in Python ?

Answer

To merge two dictionaries in Python, you can use the `update()` method or the dictionary unpacking operator (`**`). This allows you to combine the key-value pairs from both dictionaries.

✐ Examples

1 Merging Two Dictionaries Using `update()` Method

We can merge two dictionaries in Python using the `update()` method. This example demonstrates how to declare and initialize two dictionaries, use the `update()` method to merge them, and print the merged dictionary.

For example,

We start by declaring and initializing two dictionaries named first_dict and second_dict with integer keys and string values.
We use the `update()` method to merge the dictionaries.
We print the merged dictionary.

Python Program

first_dict = {
    1: 'One',
    2: 'Two'
}

second_dict = {
    3: 'Three',
    4: 'Four'
}

# Merge the dictionaries using update()
first_dict.update(second_dict)

# Print the merged dictionary
print('Merged dictionary:')
for key, value in first_dict.items():
    print(f'Key: {key}, Value: {value}')

Output

Merged dictionary:
Key: 1, Value: One
Key: 2, Value: Two
Key: 3, Value: Three
Key: 4, Value: Four

2 Merging Two Dictionaries Using Dictionary Unpacking

We can merge two dictionaries in Python using the dictionary unpacking operator (`**`). This example demonstrates how to declare and initialize two dictionaries, use dictionary unpacking to merge them, and print the merged dictionary.

For example,

We start by declaring and initializing two dictionaries named first_dict and second_dict with integer keys and string values.
We use the dictionary unpacking operator (`**`) to merge the dictionaries.
We print the merged dictionary.

Python Program

first_dict = {
    1: 'One',
    2: 'Two'
}

second_dict = {
    3: 'Three',
    4: 'Four'
}

# Merge the dictionaries using dictionary unpacking
merged_dict = {**first_dict, **second_dict}

# Print the merged dictionary
print('Merged dictionary:')
for key, value in merged_dict.items():
    print(f'Key: {key}, Value: {value}')

Output

Merged dictionary:
Key: 1, Value: One
Key: 2, Value: Two
Key: 3, Value: Three
Key: 4, Value: Four

Summary

In this tutorial, we learned How to Merge Two Dictionaries in Python language with well detailed examples.

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