try: from ppn_all import * except ImportError: raiseException('ppn_all.py missing') try: # computer from ppn_cp import * except ImportError: try: # Casio USB Power Graphic 3 from ppn_cas import * except ImportError: try: # 83P/84+ CE Python Edition from ppn_ce import * except ImportError: try: # NumWorks from ppn_nw import * except ImportError: try: # Ndless from ppn_ns import * except ImportError: raise Exception('device ppn_?.py missing')