code: def _get_sympy_evaluator(self):
      fx, fy, fz = self.d_vars
      u = self.u_interval.v
      v = self.v_interval.v
  
      @float_vec3
      def e(_u, _v):
          return (
              fx.subs(u, _u).subs(v, _v),
              fy.subs(u, _u).subs(v, _v),
              fz.subs(u, _u).subs(v, _v),
          )
  
      return e
  
imports: from sympy.utilities.lambdify import lambdify
  from sympy.core.numbers import pi
  from sympy.functions import sin, cos
  from sympy.plotting.pygletplot.plot_curve import PlotCurve
  from sympy.plotting.pygletplot.plot_surface import PlotSurface
  from math import sin
  from math import cos
label_desc: Use image node_id 1 for calling the ParametricSurface obj's underlying member method code with example usage: obj._get_sympy_evaluator() and returns: e, fx,  fy,  fz