Python 3.12 compatibility (#881)

* Add 3.12 to the CI test matrix.
* Ignore depr warnings inside pytest on 3.12
* Upgrade cython to 3.0.0b3

.github/workflows/ci.yml

@@ -70,6 +70,7 @@ jobs:
         pyver: ['3.7', '3.8', '3.9', '3.10', '3.11']
         no-extensions: ['', 'Y']
         os: [ubuntu, macos, windows]
+        experimental: [false]
         exclude:
           - os: macos
             no-extensions: 'Y'
@@ -78,13 +79,24 @@ jobs:
         include:
           - pyver: pypy-3.9
             no-extensions: 'Y'
+            experimental: false
             os: ubuntu
           - pyver: pypy-3.8
             no-extensions: 'Y'
+            experimental: false
+            os: ubuntu
+          - pyver: 3.12-dev
+            no-extensions: ''
+            experimental: true
+            os: ubuntu
+          - pyver: 3.12-dev
+            no-extensions: 'Y'
+            experimental: true
             os: ubuntu
       fail-fast: false
     runs-on: ${{ matrix.os }}-latest
     timeout-minutes: 15
+    continue-on-error: ${{ matrix.experimental }}
     steps:
     - name: Checkout
       uses: actions/checkout@v3

CHANGES/829.bugfix.rst

@@ -0,0 +1 @@
+Support Python 3.12 (upgraded cython to 3.0.0b3, provided CI test coverage)

requirements/cython.txt

@@ -1 +1 @@
-cython==0.29.35
+cython==3.0.0b3

setup.cfg

@@ -4,12 +4,15 @@ license_file = LICENSE
 
 [tool:pytest]
 addopts = --cov=yarl -v
-filterwarnings=error
 norecursedirs = dist docs build .tox .eggs venv virtualenv .git
 minversion = 3.8.2
 testpaths = tests/
 junit_suite_name = yarl_test_suite
-
+filterwarnings =
+    error
+    # https://github.com/pytest-dev/pytest/issues/10977 and https://github.com/pytest-dev/pytest/pull/10894
+    ignore:ast\.(Num|NameConstant|Str) is deprecated and will be removed in Python 3\.14; use ast\.Constant instead:DeprecationWarning:_pytest
+    ignore:Attribute s is deprecated and will be removed in Python 3\.14; use value instead:DeprecationWarning:_pytest
 
 [pep8]
 max-line-length=79