docs: def move_forward(num_steps):
      """Moves the pen forward a few steps in the direction that its "turtle" is facing.
  
      Arguments:
          num_steps - a number like 20. A bigger number makes the pen move farther.
      """
      assert int(num_steps) == num_steps, "move_forward() only accepts integers, but you gave it " + str(num_steps)
  
      _make_cnc_request("move.forward./" + str(num_steps))
  
      state['turtle'].forward(num_steps)