Integers as the only valid inputs

Question

What I\'m trying to do is ask users for two inputs, if one of the inputs is less than zero or if the input is some string then ask for the inputs again. The only valid input are

Answer 1

Use the try except method

while stringval = input("What is the number you want to enter"):
  try:
    intval = int(stringval)
    if intval > -1:
      break
  except ValueError:
    print 'Invalid answer, try again'

# Process intval now