code: def getRectArea(*args):
      
      rect = args[0]
      if len(args) > 1:
          unit = args[1]
      else:
          unit = "px"    
      u = {"px": (1,1), "in": (1.,72.), "cm": (2.54, 72.), "mm": (25.4, 72.)}
      f = (u[unit][0] / u[unit][1])**2
      return f * rect.width * rect.height
docs: Calculate area of rectangle.\nparameter is one of 'px' (default), 'in', 'cm', or 'mm'.