import RPi.GPIO as GPIO

GPIO.setmode(GPIO.BCM)

GPIO.setwarnings(False)

pinBtn = 25

GPIO.setup(pinBtn,GPIO.IN, pull_up_down=GPIO.PUD_UP)

pinLED = 18

GPIO.setup(pinLED,GPIO.OUT)

LEDon = False

GPIO.output(pinLED, LEDon)

# Polling

while(True):

GPIO.output(pinLED,0)

while(GPIO.input(pinBtn)==0):

GPIO.output(pinLED,1)

# Interrupt Driven

"""

GPIO.set_high_event(pinBtn)

while(True):

if(GPIO.event_detected(pinBtn)):

print 'button pushed!'

LEDon = not LEDon

GPIO.output(pinLED,LEDon)

"""