import Blender
from Blender import NMesh, Material, Window

editmode = Window.EditMode()    # are we in edit mode?  If so ...
if editmode: Window.EditMode(0) # leave edit mode before getting the mesh

object = Blender.Object.GetSelected()[0]
me=object.getData()
for v in me.verts:               # loop the list of vertices
  v.uvco.x *= 2.5                 # multiply the coordinates
  v.uvco.y *= 5.0
  print"o"
  v.uvco.z *= 2.5
me.update()                      # update the real mesh in Blender

if editmode: Window.EditMode(1)  # optional, just being nice