Get support for Python 3.11

[twisted-trac]

	@adiroiban reported
Trac ID	trac#10343
Type	enhancement
Created	2022-05-11 20:27:34Z

Some info at #1723 (comment) from Colin

BTW, I haven't attempted to add test runs for 3.11 yet because there are some other problems. We need a Cython release with cython/cython#4667, an Automat release with glyph/automat#7453, there are some weird builtins.TypeError: __dict__ must be set to a dictionary, not a '_Dereference' test failures that I don't understand, and there are a few fairly trivial test failures due to https://docs.python.org/3.11/whatsnew/3.11.html#enhanced-error-locations-in-tracebacks. But it's generally looking closer, and this on its own is enough to let me get the testtools test suite passing.

Searchable metadata

trac-id__10343 10343
type__enhancement enhancement
reporter__adiroiban adiroiban
priority__normal normal
milestone__None None
branch__ 
branch_author__ 
status__new new
resolution__None None
component__core core
keywords__None None
time__1652300854237229 1652300854237229
changetime__1652425385864237 1652425385864237
version__None None
owner__None None
cc__mgorny

[twisted-trac]

	@mgorny commented

You can run tests using cython from 0.29.x git branch. In virtualenv it's a bit of PITA because of the new fancy PEP517 logic that insists on building using pypi's current cython but it's doable if you use setup.py install instead.

[adiroiban]

From gitter https://gitter.im/twisted/twisted?at=63529430bad3c73752e7654a

from @DMRobertson

Hi all. I've been trying to run Synapse in CI against Python 3.11 RCs, but I'm running into some new errors. One class of errors involves code objects, and I think is fixed in recent Twisted releases provided you use a sufficiently new version of automat. (See glyph/automat#139 (comment))

I reached out here to ask if there were plans to make a new release but haven't heard back. Does anyone here know more?

[eevelweezel]

I've created a PR for enabling tests against Python 3.11. There's still a huge number of failing tests. There's a ticket for fixing the jelly tests, should I create others for fixing the rest?