def volume_convert(): volume = Volume() while True: title() option = str(input(''' [1] centimetro cúbico a Litro [2] Litros a centimetro cúbico [3] Milimetros cúbicos a Litros [s]alir ''')).lower() if option == '1': volume.cmAL() elif option == '2': volume.LAcm() elif option == '3': volume.mcAL() elif option == 's': break else: print('Ingreso un dato invalido')