revpi_shutdown_button.py

import os

import revpimodio2

class Application():
    def __init__(self):
        self.rpi = revpimodio2.RevPiModIO(autorefresh=True)
        self.rpi.handlesignalend(self.cleanup_revpi)
        self.rpi.core.x2in.reg_event(self.event_shutdown, edge=revpimodio2.RISING)

    def __shutdown(self):
        self.rpi.exit()
        os.system("sudo shutdown -h now")
    
    def cleanup_revpi(self):
        self.rpi.core.a1green.value = False
    
    def event_shutdown(self, ioname, iovalue):
        self.__shutdown()

    def start(self):
        self.rpi.mainloop(blocking=False)

        while not self.rpi.exitsignal.wait(0.5):
            self.rpi.core.a1green.value = not self.rpi.core.a1green.value

if __name__ == "__main__":
    app = Application()
    app.start()