import RPi.GPIO as GPIO

import time

LedPin = 17 # Set GPIO17 as LED pin

BtnPin = 18 # Set GPIO18 as button pin

# Set Led status to True(OFF)

Led_status = True

# Define a setup function for some setup

def setup():

# Set the GPIO modes to BCM Numbering

GPIO.setmode(GPIO.BCM)

GPIO.setup(BtnPin, GPIO.IN)

def swLed(ev=None):

print('press!')

def main():

GPIO.add_event_detect(BtnPin, GPIO.FALLING, callback=swLed)

while True:

time.sleep(1)

def destroy():

GPIO.cleanup()

# If run this script directly, do:

if __name__ == '__main__':

setup()

try:

main()

# When 'Ctrl+C' is pressed, the program

# destroy() will be executed.

except KeyboardInterrupt:

destroy()