old_contents: # NeoPixel driver for MicroPython on ESP8266
  # MIT license; Copyright (c) 2016 Damien P. George
  
  from esp import neopixel_write
  
  class NeoPixel:
      def __init__(self, pin, n):
          self.pin = pin
          self.n = n
          self.buf = bytearray(n * 3)
          self.pin.init(pin.OUT, pin.PULL_NONE)
  
      def __setitem__(self, index, val):
          r, g, b = val
          self.buf[index * 3] = g
          self.buf[index * 3 + 1] = r
          self.buf[index * 3 + 2] = b
  
      def __getitem__(self, index):
          i = index * 3
          return self.buf[i], self.buf[i + 1], self.buf[i + 2]
  
      def write(self):
          neopixel_write(self.pin, self.buf, True)
  
new_contents: # NeoPixel driver for MicroPython on ESP8266
  # MIT license; Copyright (c) 2016 Damien P. George
  
  from esp import neopixel_write
  
  class NeoPixel:
      def __init__(self, pin, n):
          self.pin = pin
          self.n = n
          self.buf = bytearray(n * 3)
          self.pin.init(pin.OUT, pin.PULL_NONE)
  
      def __setitem__(self, index, val):
          r, g, b = val
          self.buf[index * 3] = g
          self.buf[index * 3 + 1] = r
          self.buf[index * 3 + 2] = b
  
      def __getitem__(self, index):
          i = index * 3
          return self.buf[i + 1], self.buf[i], self.buf[i + 2]
  
      def write(self):
          neopixel_write(self.pin, self.buf, True)
  
subject: Swap red and green in pixel accessor.