Try–except–finally behavior in Python - Mini Project: Build & Apply

Try-except-finally behavior

📖 Scenario: Imagine you are writing a small program that divides numbers. Sometimes, the user might enter zero as the divisor, which causes an error. You want to handle this error gracefully and always print a message at the end.

🎯 Goal: You will create a program that divides two numbers, handles division by zero using try and except, and always prints a final message using finally.

📋 What You'll Learn

Create two variables with exact values for dividend and divisor

Create a variable to store the result initialized to None

Use a try-except-finally block to perform division and handle ZeroDivisionError

Print the result or an error message

Always print a final message regardless of error

💡 Why This Matters

🌍 Real World

Handling errors like division by zero is common in programs that do calculations, such as calculators or financial apps.

💼 Career

Understanding try-except-finally is important for writing robust code that doesn't crash unexpectedly, a key skill for any programmer.

1

DATA SETUP: Create variables for dividend and divisor

Create two variables called dividend and divisor with values 10 and 0 respectively.

Python

# Your code here

Need a hint?

Use simple assignment like dividend = 10 and divisor = 0.

2

CONFIGURATION: Create a variable to store the result

Create a variable called result and set it to None.

Python

dividend = 10
divisor = 0
# Your code here

Need a hint?

Initialize result to None before the try block.

3

CORE LOGIC: Use try-except-finally to divide and handle errors

Write a try block that divides dividend by divisor and assigns it to result. Add an except ZeroDivisionError block that sets result to the string 'Cannot divide by zero'. Add a finally block that prints 'Execution completed'.

Python

dividend = 10
divisor = 0
result = None
# Your code here

Need a hint?

Use try, except ZeroDivisionError, and finally blocks exactly as described.

4

OUTPUT: Print the result

Write a print(result) statement to display the value of result.

Python

dividend = 10
divisor = 0
result = None

try:
    result = dividend / divisor
except ZeroDivisionError:
    result = 'Cannot divide by zero'
finally:
    print('Execution completed')
# Your code here

Need a hint?

Print the result after the try-except-finally block.