code: def frame(self, i):
      return self._force()[..., i]
  
imports: import numpy
  import os
  from collections import deque
  import gym
  from gym import spaces
  import cv2
  from .wrappers import TimeLimit
label_desc: Use image node_id 7 for calling the LazyFrames obj's underlying member method code with example usage: obj.frame(i) and returns: self