code: def dump_grid(grid):
      
      header = 'ver:%s' % dump_str(str(grid._version), version=grid._version)
      if bool(grid.metadata):
          header += ' ' + dump_meta(grid.metadata, version=grid._version)
      columns = dump_columns(grid.column, version=grid._version)
      rows = dump_rows(grid)
      return '\n'.join([header, columns] + rows + [''])
docs: Dump a single grid to its ZINC representation.