code: def update(self):
          '''
          Update the image before drawing.
          '''
          self.image = self.blank.copy()
          vcenter_blit(self.image, 
                  self.font.render(self.get(), True, self.color), 
                  self.marginf update(self):
          '''
          Update the image before drawing.
          '''
          self.image = self.blank.copy()
          vcenter_blit(self.image, 
                  self.font.render(self.get(), True, self.color), 
                  self.margin)
docs: Update the image before drawing.