Failed to import scipy.spatial.voronoi file

Question

I'm trying to use Voronoi tessellation from scipy

http://docs.scipy.org/doc/scipy-dev/reference/generated/scipy.spatial.Voronoi.html

but python will not import it

from scipy.spatial import Voronoi Traceback (most recent call last): File "<stdin>", line 1, in <module> ImportError: cannot import name Voronoi 

however i have no problem importing other classes from scipy.spatial

 from scipy.spatial import Delaunay