code: def set_v_steps(self, v_steps):
      if v_steps is None:
          self._v_steps = None
          return
      if isinstance(v_steps, int):
          v_steps = Integer(v_steps)
      elif not isinstance(v_steps, Integer):
          raise ValueError("v_steps must be an int or SymPy Integer.")
      if v_steps <= S.Zero:
          raise ValueError("v_steps must be positive.")
      self._v_steps = v_steps
  
imports: from sympy.core.singleton import S
  from sympy.core.symbol import Symbol
  from sympy.core.sympify import sympify
  from sympy.core.numbers import Integer
label_desc: Use image node_id 10 for calling the PlotInterval obj's underlying member method code with example usage: obj.set_v_steps(v_steps) without return types