simple_calculator.py

while True:
    print("Options:")
    print("Enter 'add' to add two numbers")
    print("Enter 'subtract' to subtract two numbers")
    print("Enter 'multiply' to multiply two numbers")
    print("Enter 'divide' todivide two numbers")
    print("Enter 'quit' to end the program")
    user_input = input(": ")

    if user_input == "quit":
        break
    elif user_input == "add":
        num1 = float(input("Enter a number: "))
        num2 = float(input("Enter another number: "))
        result = str(num1 + num2)
    elif user_input == "subtract":
        num1 = float(input("Enter a number: "))
        num2 = float(input("Enter another number: "))
        result = str(num1 - num2)
    elif user_input == "multiply":
        num1 = float(input("Enter a number: "))
        num2 = float(input("Enter another number: "))
        result = str(num1 * num2)
    elif user_input == "divide":
        num1 = float(input("Enter a number: "))
        num2 = float(input("Enter another number: "))
        result = str(num1 / num2)
    else:
        print("Unkown input")
    print("The answer is " + result)