Raising exceptions in Python - Mini Project: Build & Apply

Raising Exceptions in Python

📖 Scenario: You are building a simple program that checks user input for age eligibility to enter a club. If the age is below the allowed limit, the program should raise an exception to stop the process and inform the user.

🎯 Goal: Create a program that raises an exception when the user's age is below 18, using Python's raise statement.

📋 What You'll Learn

Create a variable called age with a specific integer value.

Create a variable called minimum_age set to 18.

Use an if statement to check if age is less than minimum_age.

Raise a ValueError with the message 'Age is below the minimum allowed.' when the condition is true.

Print 'Access granted.' if the age is valid.

💡 Why This Matters

🌍 Real World

Programs often need to check if input values are valid and stop running if they are not. Raising exceptions helps catch errors early.

💼 Career

Understanding how to raise exceptions is important for writing safe and reliable code in software development jobs.

1

Create the age variable

Create a variable called age and set it to the integer 16.

Python

# Create a variable called age and set it to 16
# Your code here

Need a hint?

Use age = 16 to store the user's age.

2

Set the minimum age

Create a variable called minimum_age and set it to the integer 18.

Python

age = 16
# Create a variable called minimum_age and set it to 18
# Your code here

Need a hint?

Use minimum_age = 18 to set the allowed age limit.

3

Raise an exception if age is too low

Write an if statement that checks if age is less than minimum_age. Inside the if, use raise ValueError('Age is below the minimum allowed.') to stop the program with an error.

Python

age = 16
minimum_age = 18
# Add an if statement to check if age is less than minimum_age
# Inside the if, raise a ValueError with the message 'Age is below the minimum allowed.'
# Your code here

Need a hint?

Use if age < minimum_age: and then raise ValueError('Age is below the minimum allowed.').

4

Print access granted if age is valid

After the if statement, write print('Access granted.') to show a success message when no exception is raised.

Python

age = 16
minimum_age = 18
if age < minimum_age:
    raise ValueError('Age is below the minimum allowed.')
# Print 'Access granted.' below
# Your code here

Need a hint?

Use print('Access granted.') after the if block.

Note: Because age is 16, the program will raise an error and not print 'Access granted.'