How to use the wpgtk.data.util.alter_brightness function in wpgtk

print("\n".join(name_list))
        exit(0)

    if args.sat:
        cl = color.get_color_list(args.sat[0])
        val = float(args.sat[1])
        cl = [util.alter_brightness(x, 0, val) for x in cl]

        color.write_colors(args.sat[0], cl)
        sample.create_sample(cl, files.get_sample_path(args.sat[0]))
        exit(0)

    if args.brt:
        cl = color.get_color_list(args.brt[0])
        val = float(args.brt[1])
        cl = [util.alter_brightness(x, val, 0) for x in cl]

        color.write_colors(args.brt[0], cl)
        sample.create_sample(cl, files.get_sample_path(args.brt[0]))
        exit(0)

    if args.theme and args.theme != "list":
        light = settings['light_theme'] == "true"
        themer.set_pywal_theme(args.theme, light)
        exit(0)

    if args.backend == "list":
        print("\n".join(pywal.colors.list_backends()))
        exit(0)

    if args.update:
        for arg in args.update:

def hls_change(self, widget, *gparam):
        if gparam[0] == "sat":
            val = 0.05 if gparam[1] == "add" else -0.05
            self.color_list = [util.alter_brightness(x, 0, val)
                               for x in self.color_list]
        elif gparam[0] == "light":
            val = 10 if gparam[1] == "add" else -10
            self.color_list = [util.alter_brightness(x, val, 0)
                               for x in self.color_list]
        self.render_buttons()
        self.render_sample()

"""extract active and inactive colors from a given
    hex color value"""
    brightness = util.get_hls_val(hexc, "light")

    active = util.alter_brightness(hexc, brightness * -0.20) \
        if is_dark_theme else util.alter_brightness(hexc, brightness * 0.30)

    inactive = util.alter_brightness(hexc, brightness * -0.45) \
        if is_dark_theme else hexc

    return {
        "active": active,
        "inactive": inactive,
        "newfront": active,
        "newback": inactive,
        "newglyph": util.alter_brightness(inactive, -15)
    }

def keyword_colors(hexc, is_dark_theme=True):
    """extract active and inactive colors from a given
    hex color value"""
    brightness = util.get_hls_val(hexc, "light")

    active = util.alter_brightness(hexc, brightness * -0.20) \
        if is_dark_theme else util.alter_brightness(hexc, brightness * 0.30)

    inactive = util.alter_brightness(hexc, brightness * -0.45) \
        if is_dark_theme else hexc

    return {
        "active": active,
        "inactive": inactive,
        "newfront": active,
        "newback": inactive,
        "newglyph": util.alter_brightness(inactive, -15)
    }

def keyword_colors(hexc, is_dark_theme=True):
    """extract active and inactive colors from a given
    hex color value"""
    brightness = util.get_hls_val(hexc, "light")

    active = util.alter_brightness(hexc, brightness * -0.20) \
        if is_dark_theme else util.alter_brightness(hexc, brightness * 0.30)

    inactive = util.alter_brightness(hexc, brightness * -0.45) \
        if is_dark_theme else hexc

    return {
        "active": active,
        "inactive": inactive,
        "newfront": active,
        "newback": inactive,
        "newglyph": util.alter_brightness(inactive, -15)
    }

def auto_adjust(colors):
    """create a clear foreground and background set of colors"""
    light = settings.getboolean("light_theme", False)

    if settings.getboolean("smart_sort", True):
        colors = smart_sort(colors)

    alter_brightness = util.alter_brightness
    get_hls_val = util.get_hls_val

    added_sat = 0.25 if light else 0.1
    sign = -1 if light else 1

    if light == is_dark_theme(colors):
        colors[7], colors[0] = colors[0], colors[7]

    comment = [alter_brightness(colors[0], sign * 25)]
    fg = [alter_brightness(colors[7], sign * 60)]
    colors = colors[:8] + comment \
        + [alter_brightness(x, sign * get_hls_val(x, "light") * 0.3, added_sat)
           for x in colors[1:7]] + fg

    return colors