Translate this to python?

[Patrick Maupin]

> for (i = nPoints-1, j = 0; j < nPoints; i = j, j++)

Alternatively, if you don't like the initial setup of i and would
prefer your setup code at the top of the loop:

for j in range(npoints):
    i = (j-1) % npoints
    ... (your code here)

Finally, you could always do something like this:

pointrange = range(npoints)

for i,j in zip(pointrange[-1:]+pointrange[:-1], pointrange):
    ... (your code here)

This latter could be useful if you are reusing the range on a regular
basis -- in fact you could store a "rotatedpointrange" as well as a
point range.

HTH,
Pat