uvloop fails on 3.14

ImportError while loading conftest '/home/runner/work/anyio/anyio/tests/conftest.py'.
tests/conftest.py:17: in <module>
    import uvloop
/opt/hostedtoolcache/Python/3.14.0-alpha.1/x64/lib/python3.14/site-packages/uvloop/__init__.py:9: in <module>
    from .loop import Loop as __BaseLoop  # NOQA
uvloop/includes/stdlib.pxi:47: in init uvloop.loop
    ???
E   AttributeError: module 'asyncio' has no attribute 'AbstractChildWatcher'

Ah, this has been deprecated since Python 3.12 and will be removed in 3.14. Let's get rid of it in uvloop too.

With Python 3.14.0a5 there's one more thing happening:

________________ ERROR collecting _empty/tests/test_aiohttp.py _________________
ImportError while importing test module '/builddir/build/BUILD/python-uvloop-0.21.0-build/uvloop-0.21.0/_empty/tests/test_aiohttp.py'.
Hint: make sure your test modules/packages have valid Python names.
Traceback:
tests/test_aiohttp.py:14: in <module>
    from uvloop import _testbase as tb
../../BUILDROOT/usr/lib64/python3.14/site-packages/uvloop/__init__.py:6: in <module>
    from asyncio.events import BaseDefaultEventLoopPolicy as __BasePolicy
E   ImportError: cannot import name 'BaseDefaultEventLoopPolicy' from 'asyncio.events' (/usr/lib64/python3.14/asyncio/events.py)

ImportError: cannot import name 'BaseDefaultEventLoopPolicy' from 'asyncio.events'

I reported that part as python/cpython#131148

Remove usage of asyncio.AbstractChildWatcher

Deal with removed AbstractChildWatcher

I attempted to do something in #658, but it doesn't work correctly.

I still get:

=================================== FAILURES ===================================
________________________ TestBaseAIO.test_set_task_name ________________________
Traceback (most recent call last):
  File "/usr/lib64/python3.14/unittest/case.py", line 58, in testPartExecutor
    yield
  File "/usr/lib64/python3.14/unittest/case.py", line 660, in run
    self._callTestMethod(testMethod)
    ~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^
  File "/usr/lib64/python3.14/unittest/case.py", line 606, in _callTestMethod
    result = method()
  File "/builddir/build/BUILD/python-uvloop-0.21.0-build/uvloop-0.21.0/_empty/tests/test_base.py", line 594, in test_set_task_name
    self.assertEqual(result, "mytask!")
    ~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^
  File "/usr/lib64/python3.14/unittest/case.py", line 916, in assertEqual
    assertion_func(first, second, msg=msg)
    ~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib64/python3.14/unittest/case.py", line 909, in _baseAssertEqual
    raise self.failureException(msg)
AssertionError: None != 'mytask!'
________________ TestUVExecutors.test_executors_process_pool_01 ________________
Traceback (most recent call last):
  File "/usr/lib64/python3.14/unittest/case.py", line 58, in testPartExecutor
    yield
  File "/usr/lib64/python3.14/unittest/case.py", line 660, in run
    self._callTestMethod(testMethod)
    ~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^
  File "/usr/lib64/python3.14/unittest/case.py", line 606, in _callTestMethod
    result = method()
  File "/builddir/build/BUILD/python-uvloop-0.21.0-build/uvloop-0.21.0/_empty/tests/test_executors.py", line 35, in test_executors_process_pool_01
    self.run_pool_test(concurrent.futures.ProcessPoolExecutor)
    ~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/builddir/build/BUILD/python-uvloop-0.21.0-build/uvloop-0.21.0/_empty/tests/test_executors.py", line 29, in run_pool_test
    self.loop.run_until_complete(run())
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^
  File "uvloop/loop.pyx", line 1518, in uvloop.loop.Loop.run_until_complete
  File "/builddir/build/BUILD/python-uvloop-0.21.0-build/uvloop-0.21.0/_empty/tests/test_executors.py", line 24, in run
    res = await asyncio.gather(*coros)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
concurrent.futures.process.BrokenProcessPool: A process in the process pool was terminated abruptly while the future was running or pending.
_______________ TestAIOExecutors.test_executors_process_pool_01 ________________
Traceback (most recent call last):
  File "/usr/lib64/python3.14/unittest/case.py", line 58, in testPartExecutor
    yield
  File "/usr/lib64/python3.14/unittest/case.py", line 660, in run
    self._callTestMethod(testMethod)
    ~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^
  File "/usr/lib64/python3.14/unittest/case.py", line 606, in _callTestMethod
    result = method()
  File "/builddir/build/BUILD/python-uvloop-0.21.0-build/uvloop-0.21.0/_empty/tests/test_executors.py", line 35, in test_executors_process_pool_01
    self.run_pool_test(concurrent.futures.ProcessPoolExecutor)
    ~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/builddir/build/BUILD/python-uvloop-0.21.0-build/uvloop-0.21.0/_empty/tests/test_executors.py", line 29, in run_pool_test
    self.loop.run_until_complete(run())
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^
  File "/usr/lib64/python3.14/asyncio/base_events.py", line 719, in run_until_complete
    return future.result()
           ~~~~~~~~~~~~~^^
  File "/builddir/build/BUILD/python-uvloop-0.21.0-build/uvloop-0.21.0/_empty/tests/test_executors.py", line 24, in run
    res = await asyncio.gather(*coros)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
concurrent.futures.process.BrokenProcessPool: A process in the process pool was terminated abruptly while the future was running or pending.
___________________ TestIssue39Regr.test_issue39_regression ____________________
Traceback (most recent call last):
  File "/builddir/build/BUILD/python-uvloop-0.21.0-build/uvloop-0.21.0/_empty/tests/test_regr1.py", line 114, in test_issue39_regression
    self.run_test()
    ~~~~~~~~~~~~~^^
  File "/builddir/build/BUILD/python-uvloop-0.21.0-build/uvloop-0.21.0/_empty/tests/test_regr1.py", line 93, in run_test
    addr = qout.get()
  File "/usr/lib64/python3.14/multiprocessing/queues.py", line 101, in get
    res = self._recv_bytes()
  File "/usr/lib64/python3.14/multiprocessing/connection.py", line 222, in recv_bytes
    buf = self._recv_bytes(maxlength)
  File "/usr/lib64/python3.14/multiprocessing/connection.py", line 437, in _recv_bytes
    buf = self._recv(4)
  File "/usr/lib64/python3.14/multiprocessing/connection.py", line 402, in _recv
    chunk = read(handle, to_read)
  File "/builddir/build/BUILD/python-uvloop-0.21.0-build/uvloop-0.21.0/_empty/tests/test_regr1.py", line 74, in on_alarm
    raise FailedTestError
tests.test_regr1.FailedTestError

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib64/python3.14/unittest/case.py", line 58, in testPartExecutor
    yield
  File "/usr/lib64/python3.14/unittest/case.py", line 660, in run
    self._callTestMethod(testMethod)
    ~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^
  File "/usr/lib64/python3.14/unittest/case.py", line 606, in _callTestMethod
    result = method()
  File "/builddir/build/BUILD/python-uvloop-0.21.0-build/uvloop-0.21.0/_empty/tests/test_regr1.py", line 116, in test_issue39_regression
    self.fail('deadlocked in libuv')
    ~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/lib64/python3.14/unittest/case.py", line 741, in fail
    raise self.failureException(msg)
AssertionError: deadlocked in libuv

@hroncok

@hroncok #662 should help with one of the failures there.

@hroncok

@hroncok I have been looking at your work rather closely since I am the maintainer of the windows branch since I am trying to get caught up with some of these changes being made here and I was wondering if maybe migrating to using AbstractEventLoop would be a good solution and then making some form a deprecation warning that discourages the usage of event-loop-policies.

Any update on this? Now that 3.14 is out it would be nice to get things working.

+1 also blocked on the upgrade because of this

uvloop 0.22.0

Hi, thanks so much for the fix, however on pypi there is still no 0.22.0 release (as well github releases).

@tajchert

Hi, thanks so much for the fix, however on pypi there is still no 0.22.0 release (as well github releases).

@tajchert it hasn't been published yet, see #692

fix: Downgrade Python to 3.13.7 for uvloop compatibility

test: Add uvloop event loop functionality test

uvloop 0.22.0

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uvloop fails on 3.14 #637

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uvloop fails on 3.14 #637

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fantix commented on Oct 21, 2024

befeleme commented on Mar 12, 2025

hroncok commented on Mar 12, 2025

hroncok commented on Mar 12, 2025

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