import Blender
from Blender import *

selection = Blender.Object.GetSelected()

for ob in selection:

	try:
		black=Blender.Material.Get('black')
	except:
		black=Blender.Material.New('black')
		black.rgbCol = 0.0,0.0,0.0
		black.mode |= Material.Modes.SHADELESS
		
	# Get the mesh from the object
	me = ob.getData(mesh=True)
		
	me.materials = [black]