Multiple exception handling in Python - Mini Project: Build & Apply

Multiple exception handling

📖 Scenario: You are writing a simple calculator program that takes two numbers and divides them. Sometimes, users might enter invalid input or try to divide by zero. You want to handle these errors gracefully.

🎯 Goal: Build a program that asks for two numbers, divides them, and uses multiple exception handling to catch ValueError and ZeroDivisionError.

📋 What You'll Learn

Create two variables num1 and num2 to store user input

Create a variable to store the division result

Use a try block to convert inputs to integers and perform the division

Use multiple except blocks to catch ValueError and ZeroDivisionError

Print the result if no error occurs

💡 Why This Matters

🌍 Real World

Handling errors is important in programs that take user input or perform calculations to avoid crashes and provide clear feedback.

💼 Career

Knowing how to manage multiple exceptions is a key skill for writing robust and user-friendly software.

1

Create variables for user input

Create two variables called num1 and num2. Assign input("Enter first number: ") to num1 and input("Enter second number: ") to num2.

Python

# Create variables num1 and num2 to store user inputs
# Your code here

Need a hint?

Use input() to get user input as strings.

2

Create a variable for the result

Create a variable called result and set it to None.

Python

num1 = input("Enter first number: ")
num2 = input("Enter second number: ")
# Create a variable result and set it to None
# Your code here

Need a hint?

Initialize result to None before using it.

3

Use try and multiple except blocks

Write a try block that converts num1 and num2 to integers using int(), divides them, and assigns it to result. Add two except blocks: one for ValueError that prints "Invalid input! Please enter numbers." and one for ZeroDivisionError that prints "Cannot divide by zero.".

Python

num1 = input("Enter first number: ")
num2 = input("Enter second number: ")
result = None
# Use try block to convert num1 and num2 to integers, divide and assign to result
# Add except blocks for ValueError and ZeroDivisionError
# Your code here

Need a hint?

Put the integer conversions and division inside try. Use separate except blocks for each error type.

4

Print the result

Write a print statement that prints "Result: " followed by the value of result only if result is not None.

Python

num1 = input("Enter first number: ")
num2 = input("Enter second number: ")
result = None
try:
    num1 = int(num1)
    num2 = int(num2)
    result = num1 / num2
except ValueError:
    print("Invalid input! Please enter numbers.")
except ZeroDivisionError:
    print("Cannot divide by zero.")
# Print the result only if it is not None
# Your code here

Need a hint?

Use if result is not None: before printing.