code: def status(self):
          
          if self.request_list.conflict:
              return SolverStatus.failed
  
          if self.callback_return == SolverCallbackReturn.fail:
              # the solve has failed because a callback has nominated the most
              # recent failure as the reason.
              return SolverStatus.failed
  
          st = self.phase_stack[-1].status
          if st == SolverStatus.cyclic:
              return SolverStatus.failed
          elif len(self.phase_stack) > 1:
              if st == SolverStatus.solved:
                  return SolverStatus.solved
              else:
                  return SolverStatus.unsolved
          elif st in (SolverStatus.pending, SolverStatus.exhausted):
              return SolverStatus.unsolved
          else:
              return st
docs: Return the current status of the solve.
  
          Returns:
            SolverStatus: Enum representation of the state of the solver.