Inverting a dictionary in Python - Mini Project: Build & Apply

Inverting a dictionary

📖 Scenario: Imagine you have a dictionary that stores the names of fruits as keys and their colors as values. You want to create a new dictionary that flips this information, so the colors become the keys and the fruits become the values.

🎯 Goal: Build a Python program that inverts a dictionary by swapping its keys and values.

📋 What You'll Learn

Create a dictionary with fruit names as keys and their colors as values

Create a variable to hold the inverted dictionary

Use a dictionary comprehension to invert the original dictionary

Print the inverted dictionary

💡 Why This Matters

🌍 Real World

Inverting dictionaries is useful when you want to look up information in reverse, like finding all fruits by their color instead of the other way around.

💼 Career

Understanding how to manipulate dictionaries and use comprehensions is important for data processing, software development, and many programming tasks.

1

Create the original dictionary

Create a dictionary called fruits with these exact entries: 'apple': 'red', 'banana': 'yellow', 'grape': 'purple', 'orange': 'orange', 'lemon': 'yellow'.

Python

# Create the dictionary called fruits with the given fruit-color pairs
# Your code here

Need a hint?

Use curly braces {} to create the dictionary and separate each key-value pair with a comma.

2

Create an empty dictionary for the inverted data

Create an empty dictionary called inverted to hold the inverted fruit-color pairs.

Python

fruits = {'apple': 'red', 'banana': 'yellow', 'grape': 'purple', 'orange': 'orange', 'lemon': 'yellow'}
# Create an empty dictionary called inverted
# Your code here

Need a hint?

Use empty curly braces {} to create an empty dictionary.

3

Invert the dictionary using dictionary comprehension

Use a dictionary comprehension to create the inverted dictionary by swapping keys and values from fruits. Use color and fruit as the variable names in the comprehension.

Python

fruits = {'apple': 'red', 'banana': 'yellow', 'grape': 'purple', 'orange': 'orange', 'lemon': 'yellow'}
inverted = {}
# Use dictionary comprehension to invert fruits into inverted
# Your code here

Need a hint?

Use {key: value for key, value in dictionary.items()} format, swapping the key and value positions.

4

Print the inverted dictionary

Write a print statement to display the inverted dictionary.

Python

fruits = {'apple': 'red', 'banana': 'yellow', 'grape': 'purple', 'orange': 'orange', 'lemon': 'yellow'}
inverted = {color: fruit for fruit, color in fruits.items()}
# Print the inverted dictionary
# Your code here

Need a hint?

Use print(inverted) to show the result.