简单的汽车启动/停止sim卡问题

Question

所以我刚刚开始学习python，从一些冗长的youtube教程开始。一个教程希望我创建一个启动和停止汽车的sim/游戏。我的代码与解决方案非常相似。我不确定有什么问题。具体的问题是，当汽车已经启动或停止时，程序无法返回打印功能——它只是重申启动/停止打印，就好像指示汽车是否开启或关闭的布尔代码目前不存在一样。

start = input('Enter "help" to see instructions: ').lower()

if start == 'help':
    started = False
    user_input = input("start - start the car\nstop - stop the car\nquit - exist program\n").lower()
    while True:
        if user_input == "start":
            if started:
                print("The car is already on.\n") #so if i enter start two times in a row, the second time it should print "The car is already on."
            else:
                started = True
                print("The car has started. Now what?\n")
        elif user_input == "stop":
            if not started:
                print("The car is already stopped.\n")
            else:
                started = False
                print("The car has stopped. Now what?\n") #if this is the first command entered after "help", it should be printing "The car is already stopped." but doesn't do that.
        elif user_input == 'quit':
            break
else:
    print("This is not a valid command.")

Answer 1

您需要继续user_input在time循环中。只需将user_input移动到time循环中。

start = input('Enter "help" to see instructions: ').lower()

if start == 'help':
    started = False

    while True:
        user_input = input("start - start the car\nstop - stop the car\nquit - exist program\n").lower()
        if user_input == "start":
            if started:
                print("The car is already on.\n") #so if i enter start two times in a row, the second time it should print "The car is already on."
            else:
                started = True
                print("The car has started. Now what?\n")
        elif user_input == "stop":
            if not started:
                print("The car is already stopped.\n")
            else:
                started = False
                print("The car has stopped. Now what?\n") #if this is the first command entered after "help", it should be printing "The car is already stopped." but doesn't do that.
        elif user_input == 'quit':
            break
else:
    print("This is not a valid command.")

这里是输出：

[evaluate untitlewerwd-1.py]
Enter "help" to see instructions: help
start - start the car
stop - stop the car
quit - exist program
start
The car has started. Now what?

start - start the car
stop - stop the car
quit - exist program
start
The car is already on.

start - start the car
stop - stop the car
quit - exist program
stop
The car has stopped. Now what?

start - start the car
stop - stop the car
quit - exist program
stop
The car is already stopped.

start - start the car
stop - stop the car
quit - exist program
stop
The car is already stopped.

start - start the car
stop - stop the car
quit - exist program
quit