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I don't know that this is 'natively' available, though we do have some splines - from GSL and a nice complex spline class. It doesn't sound like either of these are what you are looking for.

There apparently does exist some Python NURBS stuff, though, which would be easy to use within Sage.

• See this page and search for NURBS for something the SciPy people want to integrate.
• This thread on the Numpy list also seems relevant, another place where that library was integrated.