code: def about_action(self):
          
          name = self.action.metavar or self.action.dest
          type_name = self.action.type.__name__ if self.action.type else ''
          if self.action.help or type_name:
              extra = ' (%s)' % (self.action.help or 'type: %s' % type_name)
          else:
              extra = ''
          return name + extra
docs: Simple string describing the action.