code: def draw_box(self, x, y, fillcolor="", line_color="gray"):
      self.t.up()
      self.t.goto(x * self.unit, y * self.unit)
      self.t.color(line_color)
      self.t.fillcolor(fillcolor)
      self.t.setheading(90)
      self.t.down()
      self.t.begin_fill()
      for i in range(4):
          self.t.forward(self.unit)
          self.t.right(90)
      self.t.end_fill()
  
file_path: PARL/examples/tutorials/lesson1/gridworld.py
imports: import gym
  import turtle
  import numpy
label_desc: Use image node_id 4 for calling the CliffWalkingWapper obj's underlying member method code with example usage: obj.draw_box(x, y, fillcolor, line_color) without return types