code: def step(self, action):
      prev_step = self.current_step
      self.current_step += 1
      done = self.current_step >= self.max_steps
      return np.array([prev_step], dtype="int"), 0.0, done, {}
  
imports: import collections
  import functools
  import itertools
  import multiprocessing
  import pytest
  import gym
  import numpy
  from stable_baselines.common.vec_env import DummyVecEnv, SubprocVecEnv, VecNormalize, VecFrameStack
label_desc: Use image node_id 3 for calling the StepEnv obj's underlying member method code with example usage: obj.step(action) and returns: np,  int,  done,  dict