272     def _loop_reading(self, fut=None):  argument
276             if fut is not None:
277                 assert self._read_fut is fut or (self._read_fut is None and
280                 if fut.done():
282                     length = fut.result()
290                     fut.cancel()
439     def _pipe_closed(self, fut):  argument
440         if fut.cancelled():
443         assert fut.result() == b''
447         assert fut is self._read_fut, (fut, self._read_fut)
506     def _loop_writing(self, fut=None):  argument
511             assert fut is self._write_fut
513             if fut:
515                 fut.result()
539     def _loop_reading(self, fut=None):  argument
545             assert self._read_fut is fut or (self._read_fut is None and
549             if fut is not None:
550                 res = fut.result()