code: def assignrepr(self, prefix='') -> str:
          
          with objecttools.repr_.preserve_strings(True):
              with hydpy.pub.options.ellipsis(2, optional=True):
                  prefix += '%s(' % objecttools.classname(self)
                  repr_ = objecttools.assignrepr_values(
                      sorted(self.names), prefix, 70)
                  return repr_ + ')'
docs: Return a |repr| string with a prefixed assignment.