map() function in Python - Mini Project: Build & Apply

Using the map() function in Python

📖 Scenario: You work at a fruit store and have a list of fruit prices in dollars. You want to quickly calculate the prices in cents to help with a new pricing system.

🎯 Goal: Learn how to use the map() function to apply a calculation to each item in a list.

📋 What You'll Learn

Create a list of fruit prices in dollars

Create a function to convert dollars to cents

Use the map() function with the conversion function and the list

Print the resulting list of prices in cents

💡 Why This Matters

🌍 Real World

Stores and shops often need to convert prices between units like dollars and cents for calculations and display.

💼 Career

Understanding map() helps automate repetitive tasks on lists, which is common in data processing and software development.

1

Create the list of fruit prices in dollars

Create a list called prices_dollars with these exact values: 0.5, 1.2, 0.75, 2.0, 1.5

Python

# Create the list prices_dollars with the given values
# Your code here

Need a hint?

Use square brackets [] to create a list and separate values with commas.

2

Create a function to convert dollars to cents

Define a function called dollars_to_cents that takes one parameter price and returns price * 100

Python

prices_dollars = [0.5, 1.2, 0.75, 2.0, 1.5]
# Define the function dollars_to_cents(price) below
# Your code here

Need a hint?

Use def to define the function and multiply the input by 100.

3

Use map() to convert all prices to cents

Create a variable called prices_cents that uses map() with the function dollars_to_cents and the list prices_dollars. Convert the result to a list.

Python

prices_dollars = [0.5, 1.2, 0.75, 2.0, 1.5]
def dollars_to_cents(price):
    return price * 100
# Use map() to create prices_cents list
# Your code here

Need a hint?

Use list(map(function, list)) to apply the function to each item and get a list back.

4

Print the list of prices in cents

Write a print() statement to display the variable prices_cents

Python

prices_dollars = [0.5, 1.2, 0.75, 2.0, 1.5]
def dollars_to_cents(price):
    return price * 100
prices_cents = list(map(dollars_to_cents, prices_dollars))
# Print the prices_cents list
# Your code here

Need a hint?

Use print(prices_cents) to show the final list.