Lambda syntax and behavior in Python - Mini Project: Build & Apply

Lambda syntax and behavior

📖 Scenario: Imagine you are helping a small shop calculate discounts on products quickly using simple functions.

🎯 Goal: You will create a lambda function to calculate discounted prices, then use it to find the discounted price of a product.

📋 What You'll Learn

Create a lambda function called discount that takes price and rate and returns the discounted price

Use the discount lambda function to calculate the price after a 20% discount on a product priced at 50

Print the discounted price

💡 Why This Matters

🌍 Real World

Shops and businesses often use quick calculations like discounts to update prices fast.

💼 Career

Understanding lambda functions helps you write concise code for small tasks, useful in data processing and automation jobs.

1

Create a lambda function for discount calculation

Create a lambda function called discount that takes two parameters: price and rate. It should return the price after subtracting the discount (price minus price times rate).

Python

# Create the lambda function called discount
# Your code here

Need a hint?

Remember, a lambda function is written as lambda parameters: expression.

2

Set product price and discount rate

Create two variables: product_price set to 50 and discount_rate set to 0.2 (which means 20%).

Python

discount = lambda price, rate: price - price * rate
# Create product_price and discount_rate variables
# Your code here

Need a hint?

Just assign the numbers 50 and 0.2 to the variables as shown.

3

Calculate discounted price using the lambda function

Create a variable called final_price and set it to the result of calling the discount lambda function with product_price and discount_rate as arguments.

Python

discount = lambda price, rate: price - price * rate
product_price = 50
discount_rate = 0.2
# Calculate final_price using discount lambda
# Your code here

Need a hint?

Call the lambda function like a normal function with the two variables.

4

Print the discounted price

Write a print statement to display the value of final_price.

Python

discount = lambda price, rate: price - price * rate
product_price = 50
discount_rate = 0.2
final_price = discount(product_price, discount_rate)
# Print the final_price
# Your code here

Need a hint?

Use print(final_price) to show the discounted price.