calculator.py

#!/usr/bin/env python
# This is a continuation of the my playing with python on the Raspberry
#    This program will functionally be a calculator that takes two different numeric imputs and then
#    prompts the user what they want to do with them, in a super-simple fashion.   The user enters
#     two numbers, which are saved as longs'.  Then, since I imported regular expressions, you can check
#     the input text to meet one of the if, elif conditionals below it.  For user input validation, I've
#     placed the first number and second numbers in a while loop that throws an exception for invalid input.

import re

#The main loop that keeps the py script in its entirety going

goAgain = 1
while goAgain == 1:

        # The first value entered

        validity = True
        while validity == True:
                try:
                        firstNumber = long(raw_input("Type the first number: "))
                        validity = False # If the user's input is good, exit the while loop
                except ValueError:
                        print("That's not a valid number, please re-enter the value ")
                        

        # The second value entered

        validity = True
        while validity == True:
                try:
                        secondNumber = long(raw_input("Type the second number: "))
                        validity = False # If the user's input is good, exit the while loop
                except ValueError:
                        print("That's not a valid number, please re-enter the value ")
                        

        # This section performs the user's mathematical operation based on their text input

        mathChoice = str(raw_input("Add, subtract, multiply, or divide? "))

        if "add" in mathChoice.lower():
                print firstNumber, "added to", secondNumber, "equals", firstNumber + secondNumber
        elif "subtract" in mathChoice.lower():
                print firstNumber, "minus", secondNumber, "equals", firstNumber - secondNumber
        elif "multiply" in mathChoice.lower():
                print firstNumber, "times", secondNumber, "equals", firstNumber * secondNumber
        elif "divide" in mathChoice.lower():
                print firstNumber, "divided by", secondNumber, "equals", firstNumber / secondNumber

        # This keeps the while loop going or exits it based on the text you see
        goAgain = int(raw_input("Type 1 to enter more numbers, or any other number to quit: "))

print "Goodbye!\n"

does not work