code: def inverse(self):
          
          if self.scalar == 0.0:
              raise ZeroDivisionError('scaling operator not invertible for '
                                      'scalar==0')
          return ScalingOperator(self.domain, 1.0 / self.scalar)
docs: Return the inverse operator.
  
          Examples
          --------
          >>> r3 = odl.rn(3)
          >>> vec = r3.element([1, 2, 3])
          >>> op = ScalingOperator(r3, 2.0)
          >>> inv = op.inverse
          >>> inv(op(vec)) == vec
          True
          >>> op(inv(vec)) == vec
          True