def METHOD_NAME(self):
    self.black = (0.0, 0.0, 0.0, 1.0)
    self.multiblack = np.array([(0.0, 0.0, 0.0, 1.0), (0.0, 0.0, 0.0, 1.0)])
    for color in ["green", "red", "purple"]:
        setattr(self, color, matplotlib.colors.to_rgba(color))