[3.13] gh-126699: allow AsyncIterator to be used as a base for Protocols (GH-126702) (#126762)

miss-islington · tungol · web-flow · commit a5672bec6806 · 2024-12-02T15:10:25.000+01:00
gh-126699: allow AsyncIterator to be used as a base for Protocols (GH-126702) (cherry picked from commit feb3e0b) Co-authored-by: Stephen Morton <github@tungol.org>
diff --git a/Lib/test/test_typing.py b/Lib/test/test_typing.py
@@ -4254,6 +4254,9 @@ class CustomProtocol(TestCase, Protocol):
         class CustomContextManager(typing.ContextManager, Protocol):
             pass
 
+        class CustomAsyncIterator(typing.AsyncIterator, Protocol):
+            pass
+
     def test_non_runtime_protocol_isinstance_check(self):
         class P(Protocol):
             x: int
diff --git a/Lib/typing.py b/Lib/typing.py
@@ -1989,7 +1989,8 @@ def _allow_reckless_class_checks(depth=2):
 _PROTO_ALLOWLIST = {
     'collections.abc': [
         'Callable', 'Awaitable', 'Iterable', 'Iterator', 'AsyncIterable',
-        'Hashable', 'Sized', 'Container', 'Collection', 'Reversible', 'Buffer',
+        'AsyncIterator', 'Hashable', 'Sized', 'Container', 'Collection',
+        'Reversible', 'Buffer',
     ],
     'contextlib': ['AbstractContextManager', 'AbstractAsyncContextManager'],
 }
diff --git a/Misc/NEWS.d/next/Library/2024-11-11-13-24-22.gh-issue-126699.ONGbMd.rst b/Misc/NEWS.d/next/Library/2024-11-11-13-24-22.gh-issue-126699.ONGbMd.rst
@@ -0,0 +1 @@
+Allow :class:`collections.abc.AsyncIterator` to be a base for Protocols.

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1 @@`
	`1`	+Allow :class:`collections.abc.AsyncIterator` to be a base for Protocols.