code: def format_help(self):
      
  
      if not self._cell_args:
        return super(CommandParser, self).format_help()
      else:
        # Print the standard argparse info, the cell arg block, and then the epilog
        # If we don't remove epilog before calling the super, then epilog will
        # be printed before the 'Cell args' block.
        epilog = self.epilog
        self.epilog = None
        orig_help = super(CommandParser, self).format_help()
  
        cell_args_help = '\nCell args:\n\n'
        for cell_arg, v in six.iteritems(self._cell_args):
          required = 'Required' if v['required'] else 'Optional'
          cell_args_help += '%s: %s. %s.\n\n' % (cell_arg, required, v['help'])
  
        orig_help += cell_args_help
        if epilog:
          orig_help += epilog + '\n\n'
        return orig_help
docs: Override help doc to add cell args.