Translate RGB colour to XY for HUE Lights

rgb_xy

#!/usr/bin/env python3

def rgb_xy(red, green, blue):
    red = int(red, 16)
    green = int(green, 16)
    blue = int(blue, 16)
    x = round((red * 0.649926 + green * 0.103455 + blue * 0.197109), 6)
    y = round((red * 0.234327 + green * 0.743075 + blue * 0.022598), 6)
    z = round((red * 0.0000000 + green * 0.053077 + blue * 1.035763), 6)

    X = round(x / (x + y + z), 4)
    Y = round(y / (x + y + z), 4)

    return [X, Y]