在程序退出的消息中忽略exception

我最初想在Windows上进行asynchronousstream通信。

from asyncio import * from asyncio.subprocess import PIPE,STDOUT,DEVNULL import sys async def test(exe): inst = await create_subprocess_exec(exe,stdin=PIPE,stdout=PIPE,stderr=STDOUT) inst.stdin.close() inst.wait() # for subprocess' pipes on Windows def initialize_async(): if sys.platform == 'win32': set_event_loop(ProactorEventLoop()) return get_event_loop() loop = initialize_async() loop.run_until_complete(test('attrib.exe')) loop.close()

上面的代码生成以下内容。

Exception ignored in: <bound method BaseSubprocesstransport.__del__ of <_WindowsSubprocesstransport closed pid=65088 running stdin=<_ProactorWritePipeTransport closed> stdout=<_ProactorReadPipeTransport closing fd=476 read=<_OverlappedFuture cancelled>>>> Traceback (most recent call last): File "C:Program Filespython36libasynciobase_subprocess.py",line 132,in __del__ self.close() File "C:Program Filespython36libasynciobase_subprocess.py",line 106,in close proto.pipe.close() File "C:Program Filespython36libasyncioproactor_events.py",line 84,in close self._loop.call_soon(self._call_connection_lost,None) File "C:Program Filespython36libasynciobase_events.py",line 573,in call_soon self._check_closed() File "C:Program Filespython36libasynciobase_events.py",line 357,in _check_closed raise RuntimeError('Event loop is closed') RuntimeError: Event loop is closed Exception ignored in: <object repr() Failed> Traceback (most recent call last): File "C:Program Filespython36libasyncioproactor_events.py",line 95,in __del__ warnings.warn("unclosed transport %r" % self,ResourceWarning,File "C:Program Filespython36libasyncioproactor_events.py",line 54,in __repr__ info.append('fd=%s' % self._sock.fileno()) File "C:Program Filespython36libasynciowindows_utils.py",line 152,in fileno raise ValueError("I/O operatioon on closed pipe") ValueError: I/O operatioon on closed pipe

我怎样才能删除这个错误？ stdin.close和等待似乎是不够的。

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请注意，与同步编程不同，许多asyncio函数实际上是应该等待的coroutines 。 看看如何在文档中定义wait() ：

你应该修复你的代码来等待这个协程：

async def test(exe): inst = await create_subprocess_exec(exe,stderr=STDOUT) data = await inst.stdout.readline() # readline,for example,is also coroutine. print(data) await inst.wait()

你现在不会看到任何错误。