def boxPrint(symbol, width, height): if len(symbol) != 1: raise Exception('Symbol(符号) must be a single character string.') if width <= 2: raise Exception('Width must be greater than 2.') if height <= 2: raise Exception('Height must be greater than 2.') print(symbol * width) for i in range(height - 2): print(symbol + (' ' * (width - 2)) + symbol) print(symbol * width) for sym, w, h in (('*', 4, 4), ('O', 5, 5), ('x', 1, 3), ('ZZ', 3, 3)): try: boxPrint(sym, w, h) except Exception as err: print('An exception happened: ' + str(err)) '''输出: **** * * * * **** OOOOO O O O O O O OOOOO An exception happened: Width must be greater than 2. An exception happened: Symbol must be a single character string.