code: def __str__(self):
      # Use user-facing string, because this is shown for flag choices.
      return self.value
  
imports: import enum
  import functools
  import random
  import threading
  import time
  import grpc
  from tensorboard import version
  from tensorboard.util import tb_logging
label_desc: Use image node_id 3 for calling the ChannelCredsType obj's underlying member method code with example usage: obj.__str__() and returns: self