Why exceptions occur in Python - See It in Action

Why Exceptions Occur

📖 Scenario: Imagine you are writing a simple program that asks a user to enter two numbers and divides the first number by the second. Sometimes, things can go wrong, like if the user types a word instead of a number or tries to divide by zero. These problems cause exceptions in the program.

🎯 Goal: You will create a small program that shows why exceptions happen by trying to divide two numbers. You will see what causes errors and how Python tells you about them.

📋 What You'll Learn

Create two variables with exact names and values

Add a variable to hold the divisor

Write code that divides the numbers and can cause an exception

Print the result or the error message

💡 Why This Matters

🌍 Real World

Handling exceptions is important in real programs to avoid crashes and give users helpful messages.

💼 Career

Knowing why exceptions occur and how to handle them is a key skill for all programmers to write reliable software.

1

Create two variables with numbers

Create two variables called num1 and num2 with the exact values 10 and 0 respectively.

Python

# Create variables num1 and num2 with values 10 and 0
# Your code here

Need a hint?

Use the equals sign = to assign values to variables.

2

Add a variable for the divisor

Create a variable called divisor and set it to the value of num2.

Python

num1 = 10
num2 = 0
# Create a variable divisor and set it to num2
# Your code here

Need a hint?

Assign the value of num2 to divisor using =.

3

Divide the numbers to cause an exception

Write a line that divides num1 by divisor and stores the result in a variable called result.

Python

num1 = 10
num2 = 0
divisor = num2
# Divide num1 by divisor and store in result
# Your code here

Need a hint?

Use the division operator / to divide numbers.

4

Print the result or the error message

Use a try and except block to print result if division works, or print "Error: Division by zero is not allowed." if an exception occurs.

Python

num1 = 10
num2 = 0
divisor = num2
result = num1 / divisor
# Use try-except to print result or error message
# Your code here

Need a hint?

Put the division inside try, and catch ZeroDivisionError in except.