The most common answer is:

num1 = int(input("What is the first number?: "))
num2 = int(input("What is the second number?: "))

def add(n1, n2):
    result = n1 + n2
    print(str(n1) + " + " + str(n2) + " = " + str(result))

def subtract(n1, n2):
    result = n1 - n2
    print(str(n1) + " - " + str(n2) + " = " + str(result))

def multiply(n1, n2):
    result = n1 * n2
    print(str(n1) + " * " + str(n2) + " = " + str(result))

def invalid():
    print("An invalid option was selected")

operation = input("Choose an operation (add, subtract, multiply): ").lower()

if operation == "add":
    add(num1, num2)
elif operation == "subtract":
    subtract(num1, num2)
elif operation == "multiply":
    multiply(num1, num2)
else:
    invalid()

In this version:

• Functions now take parameters, making them reusable for different numbers, not just num1 and num2.
• The input prompt for choosing an operation converts the response to lowercase to ensure case-insensitive comparison.
• Standard ASCII quotation marks are used for compatibility with Python syntax.
• The variable Operation has been changed to lowercase (operation) to follow Python naming conventions for variables.

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