code: def _solve(self):
          
  
          # Remove temporary constraints
          while len(self._remove_constr) > 0:
              self._remove_constr.pop().delete()
  
          try:
              self._prob.solve(lp.ObjectiveSense.Maximize)
          except lp.SolverError as e:
              raise_from(FluxBalanceError('Failed to solve: {}'.format(
                  e), result=self._prob.result), e)
          finally:
              # Set temporary constraints to be removed on next solve call
              self._remove_constr = self._temp_constr
              self._temp_constr = []
docs: Solve the problem with the current objective.