modify examples/scf/24-tune_diis.py, #493
modify examples/scf/24-tune_diis.py, #493

sunqm/pyscf,sunqm/pyscf,gkc1000/pyscf,gkc1000/pyscf,sunqm/pyscf,gkc1000/pyscf,gkc1000/pyscf,sunqm/pyscf,gkc1000/pyscf