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Description
Environment:
Windows 10, Python 3.9.0
consider this example script:
#!/usr/bin/env python3
import asyncio
async def execAsync():
cmd = 'timeout 10'
process = await asyncio.create_subprocess_shell(cmd, stdout=asyncio.subprocess.PIPE, stderr=asyncio.subprocess.STDOUT)
try:
while process.returncode is None:
output = await process.stdout.readline()
print(output)
await asyncio.sleep(0) # in case of a continuous streem of b'' give other processes time to do their stuff
await process.wait() # this seems to do nothing of help
except asyncio.CancelledError:
process.terminate() # this seems to do nothing of help
await process.wait() # this seems to do nothing of help
finally:
process.terminate() # this seems to do nothing of help
# process._transport.close() # This is required for me. "ValueError: I/O operation on closed pipe" otherwise
await process.wait() # this seems to do nothing of help
async def main():
canReader = asyncio.create_task(execAsync())
await asyncio.sleep(1)
canReader.cancel()
await canReader
return 0
if __name__ == '__main__':
exit(asyncio.run(main()))with process._transport.close() commented (as above) results in the following error:
Expand
Exception ignored in: <function _ProactorBasePipeTransport.__del__ at 0x0000018B72FF4A60>
Traceback (most recent call last):
File "<path to user folder>\AppData\Local\Programs\Python\Python39\lib\asyncio\proactor_events.py", line 115, in __del__
_warn(f"unclosed transport {self!r}", ResourceWarning, source=self)
File "<path to user folder>\AppData\Local\Programs\Python\Python39\lib\asyncio\proactor_events.py", line 79, in __repr__
info.append(f'fd={self._sock.fileno()}')
File "<path to user folder>\AppData\Local\Programs\Python\Python39\lib\asyncio\windows_utils.py", line 102, in fileno
raise ValueError("I/O operation on closed pipe")
ValueError: I/O operation on closed pipe
Exception ignored in: <function BaseSubprocessTransport.__del__ at 0x0000018B72FEE160>
Traceback (most recent call last):
File "<path to user folder>\AppData\Local\Programs\Python\Python39\lib\asyncio\base_subprocess.py", line 125, in __del__
_warn(f"unclosed transport {self!r}", ResourceWarning, source=self)
File "<path to user folder>\AppData\Local\Programs\Python\Python39\lib\asyncio\base_subprocess.py", line 78, in __repr__
info.append(f'stdout={stdout.pipe}')
File "<path to user folder>\AppData\Local\Programs\Python\Python39\lib\asyncio\proactor_events.py", line 79, in __repr__
info.append(f'fd={self._sock.fileno()}')
File "<path to user folder>\AppData\Local\Programs\Python\Python39\lib\asyncio\windows_utils.py", line 102, in fileno
raise ValueError("I/O operation on closed pipe")
ValueError: I/O operation on closed pipewith process._transport.close() it finishes without an error. but _transport seems to not be made to be accessed. Is there something I have missed to fix this?
See this Stackoverflow where I have found that solution (and decided to create this issue as this seems not intended).
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