Blender/Python: creating a tetrahedron

creating a tetrahedron in Python for blender (Code extracted from larger code available all over the interwebs ie. it is hard to give an actual source)

import math
import bpy


s = math.sqrt(2)/3.0
t = -1/3
u = math.sqrt(6)/3

# create tetrahedron with centre of mass being at Z=0
verts = [(0,0,1),
         (2*s,0,t),
         (-s,u,t),
         (-s,-u,t)]
faces = [[0,1,2],[0,2,3],[0,3,1],[1,3,2]]

# create another one where the base is at Z=0
#verts = [( 0.0, -1.0 / math.sqrt(3),       0.0),
#         ( 0.5,  1.0 / (2.0 * math.sqrt(3)), 0.0),
#         (-0.5,  1.0 / (2.0 * math.sqrt(3)), 0.0),
#         ( 0.0,  0.0, math.sqrt(2 / 3))]
#faces = [[0, 1, 2], [0, 1, 3], [1, 2, 3], [2, 0, 3]]

mesh = bpy.data.meshes.new("Tetrahedron")
mesh.from_pydata(verts, [], faces)
mesh.update()
obj = bpy.data.objects.new("Tetrahedron", mesh)
bpy.context.scene.objects.link(obj)