code: def _options_string(self):
          
          if len(self.options) > 0:
              s = ""
              for op in self.options:
                  if self._sized_op:
                      s += "{:s}={:s} ".format(*map(str, op))
                  else:
                      s += "{:s} ".format(str(op))
              return s.strip()
          else:
              return ""
docs: Return the option string.