Una función que calcule cuántas horas pasaron con variables

def hours_difference(time_1, time_2):
  """ (number, number) -> number

  Return the number of hours later that a time in seconds
  time_2 is than a time in seconds time_1.
        
  >>> hours_difference(1800.0, 3600.0)
  0.5
  >>> hours_difference(3600.0, 1800.0)
  -0.5
  >>> hours_difference(1800.0, 2160.0)
  0.1
  >>> hours_difference(1800.0, 1800.0)
  0.0
  """
  return (time_2 - time_1) / 3600