NeoPixel on esp8266 sample blink

from neopixel import NeoPixel
from machine import Pin
from time import sleep
pin = Pin(10, Pin.OUT)   # set GPIO0 to output to drive NeoPixels
np = NeoPixel(pin, 2)   # create NeoPixel driver on GPIO0 for 8 pixels
while True :
  np[0] = (0,0,20) # set the first pixel to white
  np[1] = (0,20,0) # set the first pixel to white
  np.write()              # write data to all pixels
  sleep(0.4)
  np[0] = (0,20,0) # set the first pixel to white
  np[1] = (0,0,20) # set the first pixel to white
  np.write()              # write data to all pixels
  sleep(0.4)

#r, g, b = np[0]         # get first pixel colour
#print (r,g,b)