python将色彩HSL转为RGB表示的方法

def HSL2RGB(h, s, l):
    u"HSL -> RGB，返回一个元组，格式为：(r, g, b)"

    if s > 0:
        v_1_3 = 1.0 / 3
        v_1_6 = 1.0 / 6
        v_2_3 = 2.0 / 3

        q = l * (1 + s) if l < 0.5 else l + s - (l * s)
        p = l * 2 - q
        hk = h / 360.0 # h 规范化到值域 [0, 1) 内
        tr = hk + v_1_3
        tg = hk
        tb = hk - v_1_3

        rgb = [
            tc + 1.0 if tc < 0 else
            tc - 1.0 if tc > 1 else
            tc
            for tc in (tr, tg, tb)
        ]

        rgb = [
            p + ((q - p) * 6 * tc) if tc < v_1_6 else
            q if v_1_6 <= tc < 0.5 else
            p + ((q - p) * 6 * (v_2_3 - tc)) if 0.5 <= tc < v_2_3 else
            p
            for tc in rgb
        ]

        rgb = tuple(int(i * 256) for i in rgb)

    # s == 0 的情况
    else:
        rgb = l, l, l

    return rgb
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