Here is an example using matplotlib.delaunay, which automatically
returns the edges and triangules:
import matplotlib.delaunay as delaunay
import matplotlib.pyplot as pp
#generate points
npts=41
xpt=sp.random.random_sample(npts)
ypt=sp.random.random_sample(npts)
#create triangulation
circumcenters,edges,tri_points,tri_neighbors=delaunay.delaunay(xpt, ypt)
#plot using edges
pp.plot(xpt[edges.T],ypt[edges.T],'b-')
#following extracts same edges from triangles
# but does not worry about repeating edges
from numpy import vstack
my_edges=vstack( (tri_points[:,0:2],
tri_points[:,1:],
tri_points[:,2::-2]) )
#plot the edges extracted (possibly multiple times) from triangles
pp.plot(xpt[my_edges.T],ypt[my_edges.T],'r--')
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