from machine import Pin, Timer

led_3 = Pin(21, Pin.OUT)
led_2 = Pin(18, Pin.OUT)
led_1 = Pin(19, Pin.OUT)
led_0 = Pin(5, Pin.OUT)

def handler_0(time_0):
    led_0.value(not led_0.value())
def handler_1(time_1):
    led_1.value(not led_1.value())
def handler_2(time_2):
    led_2.value(not led_2.value())
def handler_3(time_3):
    led_3.value(not led_3.value())

time_3 = Timer(3)
time_3.init(period = 2000, mode = Timer.PERIODIC, callback = handler_3)
time_2 = Timer(2)
time_2.init(period = 400, mode = Timer.PERIODIC, callback=handler_2)
time_1 = Timer(1)
time_1.init(period = 1000, mode = Timer.PERIODIC, callback = handler_1)
time_0 = Timer(0)
time_0.init(period = 200, mode = Timer.PERIODIC, callback=handler_0)