import machine
import time

RED_LED_PIN=1
YELLOW_LED_PIN=5
GREEN_LED_PIN=9
red_led = machine.Pin(RED_LED_PIN,machine.Pin.OUT)
yellow_led=machine.Pin(YELLOW_LED_PIN,machine.Pin.OUT)
green_led=machine.Pin(GREEN_LED_PIN,machine.Pin.OUT)

def turn_on_led(led_pin):
      red_led.value(led_Pin == RED_LED_PIN)

      yellow_led.value(led_Pin==YELLOW_LED_PIN)

      green_led.value(led_Pin == GREEN_LED_PIN)  

while True:
    turn_on_led(RED_LED_PIN)
    time.sleep(2)

    turn_on_led(YELLOW_LED_PIN)
    time.sleep(5)

    turn_on_led(GREEN_LED_PIN)
    time.sleep(2)

    turn_on_led(YELLOW_LED_PIN)
    time.sleep(5)