code: def _open(file, mode='r', buffering=-1, encoding=None, errors=None, newline=None,
            closefd=True, opener=None, *, loop=None, executor=None):
      
      if loop is None:
          loop = asyncio.get_event_loop()
      cb = partial(sync_open, file, mode=mode, buffering=buffering,
                   encoding=encoding, errors=errors, newline=newline,
                   closefd=closefd, opener=opener)
      f = yield from loop.run_in_executor(executor, cb)
  
      return wrap(f, loop=loop, executor=executor)
docs: Open an asyncio file.