code: def linsolve(self, A, b):
          
          if self.sparselib == 'umfpack':
              return umfpack.linsolve(A, b)
  
          elif self.sparselib == 'klu':
              return klu.linsolve(A, b)
docs: Solve linear equation set ``Ax = b`` and store the solutions in ``b``.
  
          Parameters
          ----------
          A
              Sparse matrix
  
          b
              RHS of the equation
  
          Returns
          -------
          None