class Critter:
  def __init__ (self, health=0, fatigue=0):
     self.health = health
     self.fatigue = fatigue

  # This method returns a string representation of the attributes of the
  # object. Automatically called whenever an object of this class is passed
  # to print.
  def __str__ (self):
     return "Health: "+ str(self.health) + "\tFatigue:" + str(self.fatigue)

  def move (self):
     self.fatigue = self.fatigue + 1

class Foo:
   def __init__ (self):
      self.num1 = 1
      self.num2 = 20


def main ():
   barney = Critter (100,0)
   eric_cartman = Critter (10,20)
   barney.move()
   print barney
   print eric_cartman


   aFoo = Foo ()
   print aFoo
 
main ()