compile_stylus.py

def compile_stylus():
    def start_compiler():
        # Forming args
        args.insert(0, os.path.join(_node_bin_path, 'stylus'))
        with TemporaryDirectory(suffix='styl') as tmpdir:
            args.append(tmpdir)
            sp.call(args)
            sh.copyfile(os.path.join(tmpdir, 'app.css'),
                os.path.join(css_path, '.app_styl.css'))

    p  = mp.Process(target=start_compiler)
    p.start()
    return p