Support Python 3.14 and remove event loop's support for child watchers

.github/workflows/ci.yml

@@ -64,11 +64,13 @@ jobs:
           # M1 runners
           "macos-14"
         ]
-        python-version: [ "3.8", "3.9", "3.10", "3.11", "3.12", "3.13-dev" ]
+        python-version: [ "3.8", "3.9", "3.10", "3.11", "3.12", "3.13-dev", "3.14-dev" ]
         include:
           - experimental: false
           - python-version: "3.13-dev"
             experimental: true
+          - python-version: "3.14-dev"
+            experimental: true
 
         exclude:
           # actions/setup-python doesn't provide Python3.8 or 3.9 for M1.

changes/498.feature.rst

@@ -0,0 +1 @@
+Support for Python 3.14 was added.

changes/498.removal.rst

@@ -0,0 +1 @@
+For Python 3.14 and beyond, the event loop's support for child watchers was removed.

pyproject.toml

@@ -35,6 +35,7 @@ classifiers = [
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
     "Programming Language :: Python :: 3.13",
+    "Programming Language :: Python :: 3.14",
     "Programming Language :: Python :: 3 :: Only",
     "Topic :: Software Development",
 ]

src/rubicon/objc/ctypes_patch.py

@@ -21,10 +21,10 @@
 # This module relies on the layout of a few internal Python and ctypes
 # structures. Because of this, it's possible (but not all that likely) that
 # things will break on newer/older Python versions.
-if sys.version_info < (3, 6) or sys.version_info >= (3, 14):
+if sys.version_info < (3, 6) or sys.version_info >= (3, 15):
     v = sys.version_info
     warnings.warn(
-        "rubicon.objc.ctypes_patch has only been tested with Python 3.6 through 3.13. "
+        "rubicon.objc.ctypes_patch has only been tested with Python 3.6 through 3.14. "
         f"You are using Python {v.major}.{v.minor}.{v.micro}. Most likely things will "
         "work properly, but you may experience crashes if Python's internals have "
         "changed significantly."

src/rubicon/objc/eventloop.py

@@ -1,10 +1,10 @@
 """PEP 3156 event loop based on CoreFoundation."""
 
 import contextvars
+import sys
 import threading
 from asyncio import (
     DefaultEventLoopPolicy,
-    SafeChildWatcher,
     coroutines,
     events,
     tasks,
@@ -16,6 +16,9 @@
 from .runtime import load_library, objc_id
 from .types import CFIndex
 
+if sys.version_info < (3, 14):
+    from asyncio import SafeChildWatcher
+
 __all__ = [
     "EventLoopPolicy",
     "CocoaLifecycle",
@@ -702,23 +705,30 @@ def _init_watcher(self):
                 if threading.current_thread() == threading.main_thread():
                     self._watcher.attach_loop(self._default_loop)
 
-    def get_child_watcher(self):
-        """Get the watcher for child processes.
+    if sys.version_info < (3, 14):
 
-        If not yet set, a :class:`~asyncio.SafeChildWatcher` object is
-        automatically created.
-        """
-        if self._watcher is None:
-            self._init_watcher()
+        def get_child_watcher(self):
+            """Get the watcher for child processes.
+
+            If not yet set, a :class:`~asyncio.SafeChildWatcher` object is
+            automatically created.
+
+            REMOVED: Child watcher support was obsoleted in Python 3.14.
+            """
+            if self._watcher is None:
+                self._init_watcher()
+
+            return self._watcher
 
-        return self._watcher
+        def set_child_watcher(self, watcher):
+            """Set the watcher for child processes.
 
-    def set_child_watcher(self, watcher):
-        """Set the watcher for child processes."""
-        if self._watcher is not None:
-            self._watcher.close()
+            REMOVED: Child watcher support was obsoleted in Python 3.14.
+            """
+            if self._watcher is not None:
+                self._watcher.close()
 
-        self._watcher = watcher
+            self._watcher = watcher
 
 
 class CFLifecycle:

tox.ini

@@ -12,7 +12,7 @@ extend-ignore =
     E203,
 
 [tox]
-envlist = towncrier-check,pre-commit,docs{,-lint,-all},py{38,39,310,311,312,313}
+envlist = towncrier-check,pre-commit,docs{,-lint,-all},py{38,39,310,311,312,313,314}
 skip_missing_interpreters = true
 
 [testenv:pre-commit]
@@ -21,7 +21,7 @@ wheel_build_env = .pkg
 extras = dev
 commands = pre-commit run --all-files --show-diff-on-failure --color=always
 
-[testenv:py{,38,39,310,311,312,313}]
+[testenv:py{,38,39,310,311,312,313,314}]
 package = wheel
 wheel_build_env = .pkg
 depends = pre-commit