class Car(object):
   '''
   This is a Car I'm defining
   '''
   def __init__(self):
       '''
       Here we set up some properties
       '''
       self.gasoline = 0
       self.distance = 0

   def run(self, hours):
       '''
       This is a method, so our car can run
       '''
       self.distance += hours * 100       # Our car runs 100 kilometers per hour
       self.gasoline -= hours * 4         # The car takes 4 liters to run 100 kilometers

   def put_gasoline(self, liters):
       '''
       We put gasoline in our car
       '''
       self.gasoline += liters

   def how_is_our_car(self):
       '''
       Let's see how the car goes
       '''
       print "Kilometers run: " + str(self.distance)
       print "Gasoline in tank: " + str(self.gasoline)


if __name__ == "__main__":
     # Now that we have the class Car, we create two actual
     # car objects. These will behave as cars as we defined
     # with our class
     car_one = Car()
     car_two = Car()

     # We put gas on our cars
     car_one.put_gasoline(40)
     car_two.put_gasoline(50)

     # And then we make them run
     car_one.run(3)
     car_two.run(4)

     # Now we check how each one is doing
     print "Car No. 1"
     car_one.how_is_our_car()
     print "Car No. 2"
     car_two.how_is_our_car()