Support Py3.12 (#113)

* test py3.12 and selected pypy up to 3.10

* skip concurrency test on PyPy

* extend package markers up to Py3.12

Author: maxfischer2781

.github/workflows/unittests.yml

@@ -11,7 +11,10 @@ jobs:
     runs-on: ubuntu-20.04
     strategy:
       matrix:
-        python-version: ['3.6', '3.7', '3.8', '3.9', '3.10', 'pypy-3.6', 'pypy-3.7']
+        python-version: [
+          '3.6', '3.7', '3.8', '3.9', '3.10', '3.11', '3.12',
+          'pypy-3.6', 'pypy-3.8', 'pypy-3.10'
+        ]
 
     steps:
     - uses: actions/checkout@v3

pyproject.toml

@@ -20,6 +20,8 @@ classifiers = [
     "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
+    "Programming Language :: Python :: 3.11",
+    "Programming Language :: Python :: 3.12",
 ]
 license = {"file" = "LICENSE"}
 keywords = ["async", "enumerate", "itertools", "builtins", "functools", "contextlib"]

unittests/test_itertools.py

@@ -1,5 +1,6 @@
 import itertools
 import sys
+import platform
 
 import pytest
 
@@ -318,21 +319,27 @@ async def test_peer(peer_tee):
     sys.version_info < (3, 8),
     reason="async generators only protect against concurrent access since 3.8",
 )
+@pytest.mark.skipif(
+    platform.python_implementation() != "CPython",
+    reason="async generators only protect against concurrent access on CPython",
+)
 @multi_sync
 async def test_tee_concurrent_unlocked():
-    """Test that does not prevent concurrency without a lock"""
+    """Test that tee does not prevent concurrency without a lock"""
     items = list(range(12))
 
+    # concurrency-unsafe iterator that task-switches between yields
     async def iter_values():
         for item in items:
-            # switch to other tasks a few times to guarantees another runs
+            # switch to other tasks a few times to guarantee another runs
             for _ in range(5):
                 await Switch()
             yield item
 
     async def test_peer(peer_tee):
         assert await a.list(peer_tee) == items
 
+    # schedule two tasks that read via tee from the same iterator
     this, peer = a.tee(iter_values(), n=2)
     await Schedule(test_peer(peer))
     await Switch()