如何停止导入当前模块

Question

如何停止导入当前模块？

例如，我们说我有这段代码：

try:
    import RPi.GPIO as GPIO
except ImportError:
    # not on a raspberry pi, warning functions do nothing
    warn_with_led = lambda: None
    warn_with_sound = lambda: None
else:
    # on a raspberry pi
    def warn_with_led():
        GPIO.setmode(GPIO.BCM)
        # more stuff
        # more stuff
        # more stuff
        GPIO.cleanup()

    def warn_with_sound():
        GPIO.setmode(GPIO.BCM)
        # more stuff
        # more stuff
        # more stuff
        GPIO.cleanup()

不是用额外的缩进级别（由import try / except创建）编写整个代码，有没有办法从当前文件退出/返回？是否有解除缩进的解决方案，可能是：

try:
    import RPi.GPIO as GPIO
except ImportError:
    # not on a raspberry pi, warning functions do nothing
    warn_with_led = lambda: None
    warn_with_sound = lambda: None
    exit_this_module()   # <========= I would like to exit this file only

def warn_with_led():
    GPIO.setmode(GPIO.BCM)
    # more stuff
    # more stuff
    # more stuff
    GPIO.cleanup()

def warn_with_sound():
    GPIO.setmode(GPIO.BCM)
    # more stuff
    # more stuff
    # more stuff
    GPIO.cleanup()