def calculator():
    print("Welcome to the Python Calculator!")
    print("Select an operation:")
    print("1. Addition (+)")
    print("2. Subtraction (-)")
    print("3. Multiplication (*)")
    print("4. Division (/)")
    print("5. Exponentiation (^)")
    print("6. Modulus (%)")
    print("7. Exit")

    while True:
        # Get user input for operation
        try:
            choice = int(input("\nEnter the number of the operation (1-7): "))
        except ValueError:
            print("Invalid input! Please enter a number between 1 and 7.")
            continue

        if choice == 7:
            print("Thank you for using the calculator. Goodbye!")
            break

        if choice not in range(1, 7):
            print("Invalid choice! Please select a valid operation.")
            continue

        # Get numbers from user
        try:
            num1 = float(input("Enter the first number: "))
            num2 = float(input("Enter the second number: "))
        except ValueError:
            print("Invalid input! Please enter numeric values.")
            continue

        # Perform the selected operation
        if choice == 1:
            print(f"Result: {num1} + {num2} = {num1 + num2}")
        elif choice == 2:
            print(f"Result: {num1} - {num2} = {num1 - num2}")
        elif choice == 3:
            print(f"Result: {num1} * {num2} = {num1 * num2}")
        elif choice == 4:
            if num2 == 0:
                print("Error: Division by zero is not allowed.")
            else:
                print(f"Result: {num1} / {num2} = {num1 / num2}")
        elif choice == 5:
            print(f"Result: {num1} ^ {num2} = {num1 ** num2}")
        elif choice == 6:
            print(f"Result: {num1} % {num2} = {num1 % num2}")

if __name__ == "__main__":
    calculator()