code: def require_all_args(f):
      def check(self, *args, **kwargs):
          for g in [self._v, self._v_min, self._v_max, self._v_steps]:
              if g is None:
                  raise ValueError("PlotInterval is incomplete.")
          return f(self, *args, **kwargs)
  
      return check
  
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 1 for calling the PlotInterval obj's underlying member method code with example usage: obj.require_all_args(f) and returns: check, f