Python function for Blender to automate the process of repeated extruding, rotation and scaling of a given face.

blender_extrude.py

def extrude(step = 5, start = 0, end = 360, minimum_width = 0.5, hstep = 1, rotation = 2) :
    """Extrude, rotate and scale at same time. Before calling, select the
face that this should be applied in the 3d view.

    """
    K = (sin(radians(start)) + 1 + minimum_width)
    for x in range(start + step, end, step) :
        bpy.ops.mesh.extrude_region_move(TRANSFORM_OT_translate={"value":(0,0,hstep)})
        bpy.ops.transform.rotate(value=radians(rotation), axis=(0, 0, 1))
        L = (sin(radians(x)) + 1 + minimum_width)
        M = L / K
        K = L
        bpy.ops.transform.resize(value=(M,M,0), constraint_axis=(True, True, False))