Add Python 3.12 support (#64)

* ci: Include Python 3.12 as one of primary test targets
* doc: Mention the child watcher API deprecation issue
* ci: Upgrade black (23.7.0 -> 23.9.1)
* setup: Update the trove classifier to include Python 3.12

.github/workflows/default.yml

@@ -12,10 +12,7 @@ jobs:
         os: [ubuntu-latest, macos-latest]
         python-version:
         - "3.11"
-        experimental: [false]
-        include:
-        - python-version: "~3.12.0-0"
-          experimental: true
+        - "3.12"
     steps:
     - uses: actions/checkout@v3
     - name: Set up Python

.gitignore

@@ -82,6 +82,7 @@ celerybeat-schedule
 .envrc
 
 # virtualenv
+.venv/
 venv/
 ENV/
 

changes/64.feature.md

@@ -0,0 +1 @@
+Add Python 3.12 support

setup.cfg

@@ -15,6 +15,7 @@ classifiers =
     Programming Language :: Python
     Programming Language :: Python :: 3
     Programming Language :: Python :: 3.11
+    Programming Language :: Python :: 3.12
     Topic :: Software Development
 url = https://github.com/achimnol/aiotools
 project_urls =
@@ -41,7 +42,7 @@ build =
     twine~=4.0
     towncrier~=22.12
 test =
-    pytest~=7.2.2
+    pytest~=7.4.2
     pytest-asyncio~=0.21
     pytest-cov
     pytest-mock
@@ -53,7 +54,7 @@ lint =
     ruff>=0.0.285
     ruff-lsp>=0.0.37
 typecheck =
-    mypy~=1.4.1
+    mypy~=1.5.1
 docs =
     sphinx~=4.3
     sphinx-rtd-theme~=1.0

src/aiotools/server.py

@@ -228,18 +228,20 @@ def helper(*args, **kwargs):
 
 
 def setup_child_watcher(loop: asyncio.AbstractEventLoop) -> None:
-    try:
-        watcher_cls = getattr(asyncio, "PidfdChildWatcher", None)
-        if _has_pidfd and watcher_cls:
-            watcher = watcher_cls()
-            asyncio.set_child_watcher(watcher)
-        else:
-            # Just get the default child watcher.
-            watcher = asyncio.get_child_watcher()
-        if not watcher.is_active():
-            watcher.attach_loop(loop)
-    except NotImplementedError:
-        pass  # for uvloop
+    if sys.version_info < (3, 12, 0):
+        # see python/cpython#94597 (issue) and python/cpython#98215 (pr)
+        try:
+            watcher_cls = getattr(asyncio, "PidfdChildWatcher", None)
+            if _has_pidfd and watcher_cls:
+                watcher = watcher_cls()
+                asyncio.set_child_watcher(watcher)
+            else:
+                # Just get the default child watcher.
+                watcher = asyncio.get_child_watcher()
+            if not watcher.is_active():
+                watcher.attach_loop(loop)
+        except NotImplementedError:
+            pass  # for uvloop
 
 
 async def cancel_all_tasks() -> None: