code: def _scalar_coef_op_right(func):
          
          @wraps(func)
          def verif(self, scoef):
              if isinstance(scoef, numbers.Number):
                  return ScalarCoefs(func(self, self._vec, scoef),
                                     self.nmax, self.mmax)
              else:
                  raise TypeError(err_msg['no_combi_SC'])
          return verif
docs: decorator for operator overloading when ScalarCoef is on the
          right