func2.py

# this is set.
misc_materials = {
    "Stationary_Water", 
    "Flowing_Water", 
    "Slime", 
    "Ice", 
    "Stained_Glass", 
    "Stained_Glass_Pane"
}

for material in bpy.data.materials:

    print("Started "+str(material))
    
    # if the material is transparent use a special shader
    if any((material == bpy.data.materials.get(tm)) for tm in transparentBlocks):
        pass

    # if the material is a light emmitting block use a special shader
    elif any((material == bpy.data.materials.get(lm)) for lm in lightBlocks):
        pass

    elif material.name in misc_materials:
        pass
    
    else:
        # use a normal shader
        Normal_Shader(material)

    print("Finished "+str(material))