#1
from machine import Pin
from time import sleep
#2
print("go")
led_pin = Pin(15,Pin.OUT)
button_pin = Pin(0,Pin.IN,Pin.PULL_DOWN)
#3
while True:
    button_state = button_pin.value()
    while button_state == 1:
        led_pin.on()
        sleep(0.5)
        led_pin.off()
        sleep(0.5)
        button_state = button_pin.value()
    led_pin.off()
    sleep (0.1)