daft.js

function gen_verts(r1, r2, num_verts, ramp){
    var tv = [];
    var edges = [];
    
    // # verts
    for (var i=0; i<num_verts; i+=1){
        var tamp = i/num_verts * 14 * Math.PI;
        var theta = i/num_verts * 2 * Math.PI;
        var x = (Math.sin(theta)*r1) + (Math.sin(tamp) * ramp),
            y = (Math.cos(theta)*r2) + (Math.cos(tamp) * ramp),
            z = 0.0;
        tv.push([x, y, z])
    }
    
    // # edges
    for (var i=0; i<(num_verts-1); i+=1){
        edges.push([i, i+1])
    }
    edges.push([num_verts-1, 0])
    return [tv, edges]
}

some_execjs.py

import bpy
import execjs

# https://github.com/doloopwhile/PyExecJS  (for python 3.4 too!)

class CompiledCall():
    def __init__(self, text_name):
        local_file = bpy.data.texts[text_name].as_string()
        self.ctx = execjs.compile(local_file)

    def call(self, r1, r2, nv, ramp):
        return self.ctx.call("gen_verts", r1, r2, nv, ramp)


CC = CompiledCall('daft.js')        


def sv_main(radius1=0.3, radius2=0.4, num_verts=10, ramp=0.5):
    verts_out = []
    edges_out = []

    in_sockets = [
        ['s', 'radius1', radius1],
        ['s', 'radius2', radius2],
        ['s', 'num_verts', num_verts],
        ['s', 'ramp', ramp]
    ]

    out_sockets = [
        ['v', 'verts', [verts_out]],
        ['s', 'edges', [edges_out]],
    ]

    verts, edges = CC.call(radius1, radius2, num_verts, ramp)
    verts_out.extend(verts)
    edges_out.extend(edges)    

    return in_sockets, out_sockets