old_contents: """Output formatters using prettytable.
  """
  
  import prettytable
  
  from .base import ListFormatter
  
  
  class TableLister(ListFormatter):
  
      ALIGNMENTS = {
          int: 'r',
          str: 'l',
          unicode: 'l',
          float: 'r',
          }
  
      def add_argument_group(self, parser):
          group = parser.add_argument_group('Table Formatter')
          group.add_argument(
              '-c', '--column',
              action='append',
              default=[],
              dest='columns',
              help='specify the column(s) to include, can be repeated',
              )
  
      def emit_list(self, column_names, data, stdout, parsed_args):
          x = prettytable.PrettyTable(column_names)
          x.set_padding_width(1)
          # Figure out the types of the columns in the
          # first row and set the alignment of the
          # output accordingly.
          data_iter = iter(data)
          first_row = next(data_iter)
          for value, name in zip(first_row, column_names):
              alignment = self.ALIGNMENTS.get(type(value), 'l')
              x.set_field_align(name, alignment)
          # Now iterate over the data and add the rows.
          x.add_row(first_row)
          for row in data_iter:
              x.add_row(row)
          formatted = x.get_string(fields=(parsed_args.columns or column_names))
          stdout.write(formatted)
          stdout.write('\n')
          return
  
new_contents: """Output formatters using prettytable.
  """
  
  import prettytable
  
  from .base import ListFormatter
  
  
  class TableLister(ListFormatter):
  
      ALIGNMENTS = {
          int: 'r',
          str: 'l',
          unicode: 'l',
          float: 'r',
          }
  
      def add_argument_group(self, parser):
          group = parser.add_argument_group('Table Formatter')
          group.add_argument(
              '-c', '--column',
              action='append',
              default=[],
              dest='columns',
              help='specify the column(s) to include, can be repeated',
              )
  
      def emit_list(self, column_names, data, stdout, parsed_args):
          x = prettytable.PrettyTable(column_names)
          x.set_padding_width(1)
          # Figure out the types of the columns in the
          # first row and set the alignment of the
          # output accordingly.
          data_iter = iter(data)
          try:
              first_row = next(data_iter)
          except StopIteration:
              pass
          else:
              for value, name in zip(first_row, column_names):
                  alignment = self.ALIGNMENTS.get(type(value), 'l')
                  x.set_field_align(name, alignment)
              # Now iterate over the data and add the rows.
              x.add_row(first_row)
              for row in data_iter:
                  x.add_row(row)
          formatted = x.get_string(fields=(parsed_args.columns or column_names))
          stdout.write(formatted)
          stdout.write('\n')
          return
  
subject: handle an empty data set