code: def __len__(self):
      return len(self._force())
  
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 4 for calling the LazyFrames obj's underlying member method code with example usage: obj.__len__() and returns: len