code: def _format_contents(self, prefix, separator, suffix):
          
  
          params = self._list_args_kwargs()
  
          if len(params) <= 0:
              return ''
  
          string = prefix + dumps_list(params, escape=self.escape,
                                       token=separator) + suffix
  
          return string
docs: Format the parameters.
  
          The formatting is done using the three arguments suplied to this
          function.
  
          Arguments
          ---------
          prefix: str
          separator: str
          suffix: str
  
          Returns
          -------
          str