使用while和if循环查询

Question

如果用户输入启动，程序应显示：：：：启动；如果用户输入停止，则汽车停止；如果用户输入退出，则我们退出汽车； ***我的查询是，如果我不使用break，则print语句将无限次执行 ***如果我使用刹车，则会退出while循环 ***我想让print语句执行一次并重复while循环

help= input(" Enter 'help' if needed ")
help = help.lower()
if help == 'help':
    command= input(" start - start the car \n stop - stop the car \n exit - to quit ")
    command = command.lower()
    while command == "start" or "stop" or "exit":

        if command == "start":
            print("car started and ready to go....")
            break
        elif command == "stop" :
            print("car has been stopped......")
            break
        elif command == "exit":
            print("we have exited .........")
            break
        else:
            print("I don't understand!!!!")
            break