Python 3.9 support

[gaby]

Now that Python 3.9 has been officially been release. Is support for Python 3.9 in the near timeline?

Changes: https://docs.python.org/3.9/whatsnew/3.9.html

[greatvovan]

Version 0.14.0 throws NotImplementedError in the very end of the program, after successful execution:

Traceback (most recent call last):
  File "/Users/vryabtsev/PycharmProjects/fastapi/benchmark2.py", line 43, in <module>
    asyncio.run(main())
  File "/Users/vryabtsev/.pyenv/versions/3.9.0/lib/python3.9/asyncio/runners.py", line 49, in run
    loop.run_until_complete(loop.shutdown_default_executor())
  File "uvloop/loop.pyx", line 1456, in uvloop.loop.Loop.run_until_complete
  File "/Users/vryabtsev/.pyenv/versions/3.9.0/lib/python3.9/asyncio/events.py", line 253, in shutdown_default_executor
    raise NotImplementedError
NotImplementedError

Process finished with exit code 1

Somehow AbstractEventLoop.shutdown_default_executor gets called here, which causes the exception.

[sileht]

It's fixed here I guess, #353.

[mhxie]

I have the same issue here. And the benchmark shows that using the Python 3.9 echo server with uvloop 0.14.0 is performing even worse than the default asyncio server. Any idea on this?

[Pyvonix]

Python 3.9.1 and uvloop 0.14.0 (in django context):

/usr/lib/python3.9/asyncio/runners.py, line 49, in run:

    loop.run_until_complete(loop.shutdown_default_executor())

uvloop/loop.pyx, line 1456, in uvloop.loop.Loop.run_until_complete:

    <source code not available>

/usr/lib/python3.9/asyncio/events.py, line 253, in shutdown_default_executor:

    raise NotImplementedError

The problem is always present.

[Tinche]

Also, can we get 3.9 wheels up on PyPI? 😇

[gaby]

Any news on this?

[fantix]

Yes - this is on my priority list and I'm hoping to help in getting a release for 3.9 soon!

[adamantike]

@fantix, with 0.15.0 release notes mentioning Python 3.9 fixes, and 0.16.0 release notes mentioning Python 3.10 support, should this issue be considered fixed?

With the following simple Dockerfile, I no longer get the NotImplementedError exception on version 0.15.0 onwards:

FROM python:3.9

RUN pip install --no-cache-dir uvloop==0.15.0

RUN echo "\
import asyncio\n\
import uvloop\n\
\n\
async def main():\n\
    ...\n\
\n\
uvloop.install()\n\
asyncio.run(main())\n\
" > /main.py

CMD ["python", "/main.py"]

[fantix]

Oh yes, thanks for the reminder! Closing now.