code: def exception(self):
      return self._exception
  
imports: import collections
  import socket
  import sys
  import warnings
  import weakref
  from .None import coroutines
  from .None import events
  from .None import exceptions
  from .None import format_helpers
  from .None import protocols
  from .log import logger
  from .tasks import sleep
label_desc: Use image node_id 3 for calling the StreamReader obj's underlying member method code with example usage: obj.exception() and returns: self