code: def set_exception(self, exc):
      self._exception = exc
  
      waiter = self._waiter
      if waiter is not None:
          self._waiter = None
          if not waiter.cancelled():
              waiter.set_exception(exc)
  
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 4 for calling the StreamReader obj's underlying member method code with example usage: obj.set_exception(exc) without return types