code: def print_internal_state(self):
      print("Step", self.step_cnt)
  
      def state_to_chr(s):
          state_index = np.nonzero(s)[0]
          if len(state_index) != 1:
              # initial state
              return "I"
          return CHARACTERS[state_index.item()]
  
      state_str = "".join([state_to_chr(s) for s in self.recent_states])
      action_str = "".join([CHARACTERS[c] for c in self.recent_actions])
      print(
          "Internal state: recent states {}, recent actions {}".format(
              state_str, action_str
          )
      )
  
imports: import itertools
  import logging
  from collections import deque
  import numpy
  import torch
  from gym import Env
  from gym.spaces import Box, Discrete
label_desc: Use image node_id 9 for calling the StringGameEnv obj's underlying member method code with example usage: obj.print_internal_state() and returns: CHARACTERS, str