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Calculating distances in 3-dimensions

Does anyone know the python function to calculate distances between points using the Euclidean calculation in 3-dimensional space? Is there a wrapper or module with this function out there?

Thanks,

Winn

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Use the numpy module , already included in ArcGIS 10

import numpy
a = numpy.array((xa,ya,za))
b = numpy.array((xb,yb,zb))
diagDist = numpy.linalg.norm(a-b)

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