<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _hsla(h, s, l, a, **kwargs):
 """ HSL with alpha channel color value. """

    res = colorsys.hls_to_rgb(float(h), float(l), float(s))
    return ColorValue([x * 255.0 for x in res] + [float(a)])