Raspberry Pi tests with button and leds

leb_button.py

#Raspberry Pi GPIO led blink and button

import RPi.GPIO as GPIO
import time
import sys
# blinking function
def blink(pin):
        GPIO.output(pin,GPIO.HIGH)
        time.sleep(1)
        GPIO.output(pin,GPIO.LOW)
        time.sleep(1)
        return
# to use Raspberry Pi board pin numbers
GPIO.setmode(GPIO.BOARD)
# set up GPIO output channel
GPIO.setup(11, GPIO.OUT)
GPIO.setup(13, GPIO.OUT)

# set up GPIO input channel
GPIO.setup(3, GPIO.IN, pull_up_down=GPIO.PUD_UP)

try:
    while True:
        blink(11)
        input_state = GPIO.input(3)
        if input_state == False:
            blink(13)
        time.sleep(0.4)
except KeyboardInterrupt:
    GPIO.cleanup()
    sys.exit(1)


GPIO.cleanup()