blinky-py/colortest.py

#!/usr/bin/python3

import board
import neopixel
import sys

length = 50

pixels = neopixel.NeoPixel(board.D18, length, pixel_order=neopixel.RGB, auto_write=False)

pixels.fill(tuple(int(sys.argv[x]) for x in (1, 2, 3)))
pixels.show()