code: def get_below_left_key_rect(self):
          
  
          key_left = self.row, self.col - 1, self.tab
          key_below_left = self.row + 1, self.col - 1, self.tab
  
          border_width_right = \
              float(self.cell_attributes[key_below_left]["borderwidth_right"]) \
              / 2.0
          border_width_bottom = \
              float(self.cell_attributes[key_left]["borderwidth_bottom"]) / 2.0
  
          rect_below_left = (self.x-border_width_right, self.y-self.height,
                             border_width_right, border_width_bottom)
          return key_below_left, rect_below_left
docs: Returns tuple key rect of below left cell