code: def serialize(self):
          
          data = {
              'type': self.__class__.__name__,
              'caption': self.caption.serialize(),
              'headings': [[cell.serialize() for cell in hrow] for hrow in self.headings],
              'rows': [[cell.serialize() for cell in row] for row in self.rows],
          }
          return data
docs: Convert Table element to python dictionary.