code: def loop_exception_handler(self, loop, context):
      self.__unhandled_exceptions.append(context)
      self.loop.default_exception_handler(context)
  
imports: import asyncio
  import asyncio.events
  import contextlib
  import os
  import pprint
  import select
  import socket
  import tempfile
  import threading
  from test import support
label_desc: Use image node_id 3 for calling the FunctionalTestCaseMixin obj's underlying member method code with example usage: obj.loop_exception_handler(loop, context) without return types