code: def step(self, ac):
      done = False
      totrew = 0
      for i in range(self.n):
          # First step after reset, use action
          if self.curac is None:
              self.curac = ac
          # First substep, delay with probability=stickprob
          elif i == 0:
              if self.rng.rand() > self.stickprob:
                  self.curac = ac
          # Second substep, new action definitely kicks in
          elif i == 1:
              self.curac = ac
          if self.supports_want_render and i < self.n - 1:
              ob, rew, done, info = self.env.step(
                  self.curac, want_render=False
              )
          else:
              ob, rew, done, info = self.env.step(self.curac)
          totrew += rew
          if done:
              break
      return ob, totrew, done, info
  
imports: from collections import deque
  import cv2
  from .atari_wrappers import WarpFrame, ClipRewardEnv, FrameStack, ScaledFloatFrame
  from .wrappers import TimeLimit
  import numpy
  import gym
label_desc: Use image node_id 3 for calling the StochasticFrameSkip obj's underlying member method code with example usage: obj.step(ac) and returns: ob,  totrew,  done,  info