Python: Merge Two Dictionaries

1. Introduction

Dictionaries in Python provide a convenient way to store data as key-value pairs. Sometimes, we might need to combine the data from two dictionaries. This blog post demonstrates how to merge two dictionaries in Python.

2. Program Overview

1. Define two dictionaries with some data.

2. Use the update method to merge the second dictionary into the first.

3. Print the merged dictionary.

3. Code Program

# Python program to merge two dictionaries

# Define two dictionaries
dict1 = {"a": 1, "b": 2}
dict2 = {"b": 3, "c": 4}

# Merge dict2 into dict1
dict1.update(dict2)

# Print the merged dictionary
print("Merged dictionary:", dict1)

Output:

Merged dictionary: {'a': 1, 'b': 3, 'c': 4}

4. Step By Step Explanation

1. We start by defining two dictionaries, dict1 and dict2. Note that both dictionaries have a common key, "b".

2. To merge dict2 into dict1, we use the update method of dictionaries. This method takes a dictionary as an argument and updates the dictionary on which it's called. If there are common keys, the values from the second dictionary (in this case dict2) will overwrite the values in the first dictionary (dict1).

3. We then print out the merged dictionary, which shows the combination of both dictionaries. The value of the key "b" in the merged dictionary is 3, as the value from dict2 overwrites the value from dict1.