Bug report

Here's an example function usingtest_capi/test_watchers.py that passes in 3.12, but fails in 3.13 and 3.14:

deftest_watch_obj_dict(self):o=MyClass()withself.watcher()aswid:self.watch(wid,o.__dict__)o.foo="bar"self.assert_events(["new:foo:bar"])# fails in 3.13+

The dictionary watcher doesn't fire in 3.13+ even though theo.__dict__ changes wheno.foo is set to"bar". The problem is specific to inline values -- our code paths for inline values do not trigger dictionary watcher events. If the object does not use inline values, then the watcher events fire as expected.

This is a problem forPyTorch Dyanmo because it uses dictionary watchers for compiler guards.

cc@williamwen42@markshannon

Linked PRs

• gh-125608: Trigger dictionary watchers when inline values change #125611
• [3.13] gh-125608: Trigger dictionary watchers when inline values change (GH-125611) #125982