Question

我是python的新手并上课。下面是我的代码。我的问题是在我想要它的最后一行，所以如果有人只是按下输入它将计算好像有人做了一个输入而不是（1/2/3或4），这将基本上回复最后一个elif并重新启动问题。但此刻它给了我这个：

SyntaxError: unexpected EOF while parsing.

有人可以帮忙吗？

def menu_loop():
    ans = True
    while ans:
        print("""
        1. My freedom awaits me, give me my blade!
        2. I've never fought before, might you help me?
        3. I have already forsaken freedom, I will fight till the death.
        4. Fighting is for the wicked. I refuse to fight.

        Press enter to quit
        """)

        ans= input("What would you like to do now?")
        if ans == 1:
            main_loop()
            break
        elif ans == 2:
            instructions_loop()
            break
        elif ans == 3:
            gauntlet_loop()
            break
        elif ans == 4:
            print("\nMen... come relieve this man of his life.")
            time.sleep(2)
            end_game_loop()
            break
        elif ans == '': 
            print("\nDo you not speak Latin, slave?")

谢谢，我找到了答案，感谢Christian。我想我得到的指令来自于Python 3，而我是2（这是大学任务）。它现在正在工作，非常感谢！

Answer 1

如果您使用的是python 2，请更改：

ans = input("What would you like to do now?")

为：

ans = raw_input("What would you like to do now?")

raw_input返回一个字符串，而输入返回integer这在python 3中被更改，在3中只有input并且它返回一个字符串

所以，如果您使用的是python 2，请将其更改为raw_input，然后调用您的其他条件：

if int(ans) == 1:
    main_loop()
    break

Answer 2

将最后的elif条件更改为elif not ans

def menu_loop():
    ans = True
    while ans:
        print("""
        1. My freedom awaits me, give me my blade!
        2. I've never fought before, might you help me?
        3. I have already forsaken freedom, I will fight till the death.
        4. Fighting is for the wicked. I refuse to fight.

        Press enter to quit
        """)

        ans = input("What would you like to do now?")
        if ans == 1:
            main_loop()
            break
        elif ans == 2:
            instructions_loop()
            break
        elif ans == 3:
            gauntlet_loop()
            break
        elif ans == 4:
            print("\nMen... come relieve this man of his life.")
            time.sleep(2)
            end_game_loop()
            break
        elif not ans: 
            print("\nDo you not speak Latin, slave?")

编辑：答案是针对python 3的。对于python 2.7，使用raw_input而不是input，并相应地使用int（ans）或字符串文字。

Answer 3

使用raw_input代替input。 input将尝试评估输入，评估空字符串会引发错误。 raw_input没有评估，只给你一个字符串。请参阅this explanation。

def main_loop():
    pass
def instructions_loop():
    pass
def gauntlet_loop():
    pass
def end_game_loop():
    pass

next_loop_func = {
    '1': main_loop, 
    '2': instructions_loop, 
    '3': gauntlet_loop,
    '4': end_game_loop,
}
def menu_loop():
    while True:
        print("""
        1. My freedom awaits me, give me my blade!
        2. I've never fought before, might you help me?
        3. I have already forsaken freedom, I will fight till the death.
        4. Fighting is for the wicked. I refuse to fight.

        Press enter to quit
        """)

        ans = raw_input("What would you like to do now?")
        if ans in next_loop_func:
            next_loop_func[ans]
        else: 
            print("\nDo you not speak Latin, slave?")


menu_loop()

如何将空输入计为else

3 个答案: