问题出在这里:我不知道如何编写脚本,因此,如果我多次键入该脚本,则启动或停止脚本将显示“已运行”或“未运行”之类的内容
running = True
print("Type help for a list of commands. ")
while running :
user=input("> ")
user_input=user.upper()
if user_input==("HELP"):
print(f"""Type start to start the car.
Type stop to stop the car.
Type quit to quit the game.""")
elif user_input==("START"):
print("You started the car. ")
elif user_input==("STOP"):
print("You stopped the car. ")
elif user_input==("QUIT"):
print("You stopped the game.")
running=False
elif user_input!=("START") and user_input!=("STOP") and user_input!=("QUIT"):
print("I don't understand that. ")
示例:
>start
You started the car.
>start
Car is already running.
>stop
You stopped the car.
>stop
Car isn't turned on.
答案 0 :(得分:3)
首先,如果要停车,必须先启动,对吗?
制作一个全局变量(我们将其命名为started
)并将其设置为False
。
现在,当我们要“启动”汽车时,首先需要检查:
elif user_input==("START"):
if started:
print("Car is already running")
else:
print("You started the car")
started = True
然后只需停止就执行类似的声明:如果started
是True
,则意味着您的汽车正在运行,您可以停止它。将started
设置为False
并显示汽车已停止的消息。否则,您甚至都没有打开汽车。
P.S。注意:在while循环之前声明并初始化started
!