code: def generate_help(self):
          
          result = []
          result.append(self.__class__.__name__)
          result.append(re.sub(r'.', '=', self.__class__.__name__))
          result.append("")
          result.append("Supported value names:")
          for a in self.allowed:
              result.append(a)
          return '\n'.join(result)
docs: Generates a help string for this container.
  
          :return: the help string
          :rtype: str