code: def _fill_column_holes(self):
          '''
          Same as _fill_row_holes but for columns.
          '''
          for column_index in range(self.start[1], self.end[1]):
              table_column = TableTranspose(self.table)[column_index]
              column_start = table_column[self.start[0]]
              if is_text_cell(column_start):
                  self._check_fill_title_column(column_indexf _fill_column_holes(self):
          '''
          Same as _fill_row_holes but for columns.
          '''
          for column_index in range(self.start[1], self.end[1]):
              table_column = TableTranspose(self.table)[column_index]
              column_start = table_column[self.start[0]]
              if is_text_cell(column_start):
                  self._check_fill_title_column(column_index)
docs: Same as _fill_row_holes but for columns.