code: def _get_sympy_evaluator(self):
      fy = self.d_vars[0]
      x = self.t_interval.v
  
      @float_vec3
      def e(_x):
          return (_x, fy.subs(x, _x), 0.0)
  
      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 Cartesian2D obj's underlying member method code with example usage: obj._get_sympy_evaluator() and returns: e, _x,  fy,  int