code: def add_holes(self, holes_list, make_ccw=True):
          
          if type(holes_list) != list: holes_list = [holes_list]
          self.holes += [Polygon(hole, make_ccw) for hole in holes_list]
docs: Add holes to the holes list.
          
          :param holes_list: Polygons that will be treated as holes.
          :type holes_list: list or pyny.Polygon
          :param make_ccw: If True, points will be sorted ccw.
          :type make_ccw: bool
          :returns: None
          
          .. note:: The holes can be anywhere, not necesarily on the 
              surface.