Lesson 10.1: Mini Project 1 – Calculator Application

Python Programming for Beginners to Advanced

Lesson 10.1: Mini Project 1 – Calculator Application

Introduction:
This project allows students to apply basic Python concepts such as functions, conditionals, loops, and user input to create a functional calculator. The project focuses on building a menu-driven application for arithmetic operations.

1. Project Overview:

Features: Addition, Subtraction, Multiplication, Division
Menu-driven interface for selecting operations
Handles invalid inputs and division by zero

2. Step-by-Step Implementation:

Step 1 – Define Functions:

Step 2 – Menu Interface:

while True:

    print("\nSelect operation:")

    print("1. Add")

    print("2. Subtract")

    print("3. Multiply")

    print("4. Divide")

    print("5. Exit")
    choice = input("Enter choice (1-5): ")
    if choice == "5":

        print("Exiting Calculator...")

        break
    num1 = float(input("Enter first number: "))

    num2 = float(input("Enter second number: "))

if choice == "1": print("Result:", add(num1, num2)) elif choice == "2": print("Result:", subtract(num1, num2)) elif choice == "3": print("Result:", multiply(num1, num2)) elif choice == "4": print("Result:", divide(num1, num2)) else: print("Invalid choice")

3. Practical Tips:

Use functions for clean and modular code
Always validate user input
Extend the calculator by adding advanced functions like exponent, modulus, or square root

Learning Outcome of This Lesson:

Build a fully functional Python calculator
Implement user input validation and error handling
Apply functions, loops, and conditionals effectively
Understand how to structure a small Python project