Scripting 3d bezier spline surface

Prompted by a question on blender.stackexchange

	import bpy
	from mathutils import Vector
	coordinates = [
	((-1, 0, 0), (-0.7, 0, 0), (-1, 0.5521, 0)),
	((0, 1, 0), (-0.5521, 1, 0), (0, 0.7, 0)),
	((0, 0, 0), (0, 0.3, 0), (-0.3, 0, 0))
	]
	def MakeCurveQuarter(objname, curvename, cList, origin=(0,0,0)):
	curvedata = bpy.data.curves.new(name=curvename, type='CURVE')
	curvedata.dimensions = '2D'
	objectdata = bpy.data.objects.new(objname, curvedata)
	objectdata.location = origin
	bpy.context.scene.objects.link(objectdata)
	polyline = curvedata.splines.new('BEZIER')
	polyline.bezier_points.add(len(cList)-1)
	for idx, (knot, h1, h2) in enumerate(cList):
	point = polyline.bezier_points[idx]
	point.co = knot
	point.handle_left = h1
	point.handle_right = h2
	point.handle_left_type = 'FREE'
	point.handle_right_type = 'FREE'
	polyline.use_cyclic_u = True
	MakeCurveQuarter("NameOfMyCurveObject", "NameOfMyCurve", coordinates)

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