Blink

import rp2
from machine import Pin
from time import sleep
import neopixel

GREEN= (255, 0, 0)
RED = (0, 255, 0)
state=1

while True:
    state = not state
    np = neopixel.NeoPixel(machine.Pin(25), 8)
    np[0] = GREEN if state else RED
    np.write()
    sleep(1)