[英]How to check if a command has already been executed
问题是:我不知道如何编写脚本,因此如果我多次键入 start 或 stop 脚本将打印诸如“已在运行”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. ")
例子:
>start
You started the car.
>start
Car is already running.
>stop
You stopped the car.
>stop
Car isn't turned on.
首先,如果你想停车,你必须先启动它,对吗?
创建一个全局变量——我们称之为started
——并将其设置为False
。 现在,当我们想要“启动”汽车时,首先我们需要检查:
elif user_input==("START"):
if started:
print("Car is already running")
else:
print("You started the car")
started = True
然后就停止类似的声明:如果started
是True
,那么这意味着你的车正在运行,你可以停下来。 将started
设置为False
并打印汽车停止的消息。 否则,你甚至没有打开汽车。
PS 注意:在 while 循环之前声明和初始化started
!
声明:本站的技术帖子网页,遵循CC BY-SA 4.0协议,如果您需要转载,请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.