Putting It All Together: A Menu-Driven Calculator We’ve learned variables, data types, functions, user input, conditionals, loops, and error handling. Let’s combine them into one program: a menu-driven calculator. This calculator allows the user to perform multiple operations until they choose to exit. It demonstrates all the basic concepts we’ve covered so far. Step 1: Define Functions for Operations Step 2: Create the Menu Loop The loop keeps running until the user selects option . exits the loop. Step 3: Handle User Input with Error Checking converts user input to a number. If input is not a valid number, is caught. Division by zero is handled in the function. Step 4: Example Run Quick Takeaway Variables store numbers and choices. Functions organize operations. Input makes the program interactive. Conditionals decide which operation to run. Loops allow repeated use until exit. Error handling prevents crashes from invalid input or division by zero. This single program demonstrates the essential Python basics you need to start building larger applications.