Make plugin aware of PEP 669

After this PEP there is now a formal way to determine if a debugger is
active, which replaces sys.gettrace.

Fixes #32

Author: delfick

alt_pytest_asyncio/plugin.py

@@ -117,6 +117,15 @@ def __init__(self, *, default_timeout: float) -> None:
     def use_default_timeout(self) -> None:
         self.set_timeout_seconds(self.timeout)
 
+    def debugger_enabled(self) -> bool:
+        if sys.version_info >= (3, 12):
+            return sys.monitoring.get_tool(sys.monitoring.DEBUGGER_ID) is not None
+        else:
+            # sys.gettrace is not a language feature and not guaranteed to be available
+            # on all python implementations, so we see if it exists
+            gettrace = getattr(sys, "gettrace", None)
+            return gettrace is not None and gettrace() is not None
+
     def set_timeout_seconds(self, timeout: float) -> None:
         if self._timeout:
             self._timeout.cancel()
@@ -130,10 +139,7 @@ def timeout_task(task: asyncio.Task[object] | None) -> None:
 
             if task and not task.done():
                 # If the debugger is active then don't cancel, so that debugging may continue
-                # sys.gettrace is not a language feature and not guaranteed to be available
-                # on all python implementations, so we see if it exists
-                gettrace = getattr(sys, "gettrace", None)
-                if gettrace is None or gettrace() is None:
+                if not self.debugger_enabled():
                     self.cancelled = True
                     task.cancel()
 

docs/index.rst

@@ -25,6 +25,11 @@ generator fixtures.
 Changelog
 ---------
 
+.. _release-0.9.4:
+
+0.9.4 - TBD
+    * Make the plugin aware of PEP 669 (`#33 <https://github.com/delfick/alt-pytest-asyncio/pull/33>`_)
+
 .. _release-0.9.3:
 
 0.9.3 - 14 April 2025