How to Concatenate Two Dictionaries in Python

1. Introduction

In Python, dictionaries are a flexible way to store and manipulate data. There might be scenarios where you need to combine two dictionaries into one. This operation is known as concatenation of dictionaries.

Concatenating two dictionaries involves merging their key-value pairs into a single dictionary. In Python 3.5+, this can be easily done with the {**d1, **d2} syntax or dict1.update(dict2) in earlier versions.

2. Program Steps

1. Create two dictionaries that you want to concatenate.

2. Concatenate them into a third dictionary.

3. Output the concatenated dictionary.

3. Code Program

# First dictionary
dict1 = {'a': 1, 'b': 2}

# Second dictionary
dict2 = {'c': 3, 'd': 4}

# Concatenate two dictionaries into dict3
dict3 = {**dict1, **dict2}

# Print the concatenated dictionary
print(f"The concatenated dictionary is: {dict3}")

Output:

The concatenated dictionary is: {'a': 1, 'b': 2, 'c': 3, 'd': 4}

Explanation:

1. dict1 and dict2 are the two original dictionaries to be concatenated, each containing two key-value pairs.

2. dict3 is created using {dict1, dict2}, which unpacks both dictionaries into a new dictionary, effectively concatenating them.

3. The print function displays dict3, showing a single dictionary with all the key-value pairs from both dict1 and dict2.