def set_alpha(self, alpha):
        alpha = float(alpha)
        self.diffuse[3] = alpha
        self.ambient[3] = alpha
        self.specular[3] = alpha
        self.emissive[3] = alpha
Set alpha/last value on all four lighting attributes.
dataset/ETHPy150Open greenmoss/PyWavefront/pywavefront/material.py/Material.set_alpha