How to use the pytradfri.const.ATTR_LIGHT_COLOR_HEX function in pytradfri

ATTR_DEVICE_STATE: False,
            },
        ],

        [
            "set_hex_color", "valid", {
                'color': '4a418a',
            }, {
                ATTR_LIGHT_COLOR_HEX: '4a418a',
            },
        ],
        [
            "set_hex_color", "invalid", {
                'color': 'RandomString',
            }, {
                ATTR_LIGHT_COLOR_HEX: 'RandomString',
            },
        ],
        [
            "set_hex_color", "with_transitiontime", {
                'color': '4a418a',
                'transition_time': 2
            }, {
                ATTR_LIGHT_COLOR_HEX: '4a418a',
                ATTR_TRANSITION_TIME: 2
            },
        ],

        [
            "set_predefined_color", "valid", {
                'colorname': 'Saturated Purple'
            }, {

def supported_features(data):
    SUPPORTED_COLOR_FEATURES = 0

    if ATTR_LIGHT_DIMMER in data:
        SUPPORTED_COLOR_FEATURES = SUPPORTED_COLOR_FEATURES\
            + SUPPORT_BRIGHTNESS

    if ATTR_LIGHT_COLOR_HEX in data:
        SUPPORTED_COLOR_FEATURES = SUPPORTED_COLOR_FEATURES\
            + SUPPORT_HEX_COLOR

    if ATTR_LIGHT_MIREDS in data:
        SUPPORTED_COLOR_FEATURES = SUPPORTED_COLOR_FEATURES\
            + SUPPORT_COLOR_TEMP

    if X in data and Y in data:
        SUPPORTED_COLOR_FEATURES = SUPPORTED_COLOR_FEATURES\
            + SUPPORT_XY_COLOR

    if ATTR_LIGHT_MIREDS not in data and X in data and Y in data and \
            ATTR_LIGHT_COLOR_SATURATION in data and ATTR_LIGHT_COLOR_HUE\
            in data:
        SUPPORTED_COLOR_FEATURES = SUPPORTED_COLOR_FEATURES\
            + SUPPORT_RGB_COLOR

def hex_color(self):
        if self.supported_features & SUPPORT_HEX_COLOR:
            return self.raw.get(ATTR_LIGHT_COLOR_HEX)

def set_hex_color(self, color, *, index=0, transition_time=None):
        """Set hex color of the light."""
        values = {
            ATTR_LIGHT_COLOR_HEX: color,
        }

        if transition_time is not None:
            values[ATTR_TRANSITION_TIME] = transition_time

        return self.set_values(values, index=index)

def hex_color(self):
        return self.raw.get(ATTR_LIGHT_COLOR_HEX)

def set_hex_color(self, color, transition_time=None):
        """Set hex color of a group."""
        values = {
            ATTR_LIGHT_COLOR_HEX: color,
        }
        if transition_time is not None:
            values[ATTR_TRANSITION_TIME] = transition_time
        return self.set_values(values)