How to use the slepc4py.SLEPc.EPS.ProblemType.PGNHEP function in slepc4py

ksp.getPC().setFactorSolverType(value)
                    else:
                        ksp.getPC().setFactorSolverPackage(value)
                elif key == "maximum_iterations":
                    eps_tolerances[1] = value
                elif key == "problem_type":
                    if value == "hermitian":
                        self.eps.setProblemType(SLEPc.EPS.ProblemType.HEP)
                    elif value == "non_hermitian":
                        self.eps.setProblemType(SLEPc.EPS.ProblemType.NHEP)
                    elif value == "gen_hermitian":
                        self.eps.setProblemType(SLEPc.EPS.ProblemType.GHEP)
                    elif value == "gen_non_hermitian":
                        self.eps.setProblemType(SLEPc.EPS.ProblemType.GNHEP)
                    elif value == "pos_gen_non_hermitian":
                        self.eps.setProblemType(SLEPc.EPS.ProblemType.PGNHEP)
                    else:
                        raise RuntimeError("Invalid problem type")
                elif key == "solver":
                    if value == "power":
                        self.eps.setType(SLEPc.EPS.Type.POWER)
                    elif value == "subspace":
                        self.eps.setType(SLEPc.EPS.Type.SUBSPACE)
                    elif value == "arnoldi":
                        self.eps.setType(SLEPc.EPS.Type.ARNOLDI)
                    elif value == "lanczos":
                        self.eps.setType(SLEPc.EPS.Type.LANCZOS)
                    elif value == "krylov-schur":
                        self.eps.setType(SLEPc.EPS.Type.KRYLOVSCHUR)
                    elif value == "lapack":
                        self.eps.setType(SLEPc.EPS.Type.LAPACK)
                    elif value == "arpack":