code: def __anext__(self) -> Awaitable[_T]:
      return self.q.get()
  
imports: import collections
  import datetime
  import heapq
  from tornado import gen, ioloop
  from tornado.concurrent import Future, future_set_result_unless_cancelled
  from tornado.locks import Event
  from typing import Union, TypeVar, Generic, Awaitable, Optional
  import typing
label_desc: Use image node_id 2 for calling the _QueueIterator obj's underlying member method code with example usage: obj.__anext__() and returns: self