bezier splines from given control points (2D)

Hi,
I am looking for a way to calculate x,y-coordinates for a polygon
interpolating a cubic or (better) a quadratic bezier spline.
The bezier spline would be defined by known x,y coordinates of n control points.
I found spline references both in scipy.interpolate and in scipy.signal.

Which of the spline "stuff" in scipy in best suited for me ?

Thanks for any help,
Sebastian Haase