gh-95077: [Enum] add code-based deprecation warnings for member.member access (GH-95083)

* issue deprecation warning for member.member access
* always store member property in current class
* remove __getattr__

1 files changed, 15 insertions, 1 deletions

diff --git a/Lib/test/test_enum.py b/Lib/test/test_enum.py
index bfab0bd..9d16fbc 100644
--- a/Lib/test/test_enum.py
+++ b/Lib/test/test_enum.py
@@ -2646,7 +2646,10 @@ class TestSpecial(unittest.TestCase):
         self.assertEqual(Private._Private__corporal, 'Radar')
         self.assertEqual(Private._Private__major_, 'Hoolihan')
 
-    @unittest.skip("Accessing all values retained for performance reasons, see GH-93910")
+    @unittest.skipIf(
+            python_version <= (3, 13),
+            'member.member access currently deprecated',
+            )
     def test_exception_for_member_from_member_access(self):
         with self.assertRaisesRegex(AttributeError, "<enum .Di.> member has no attribute .NO."):
             class Di(Enum):
@@ -2654,6 +2657,17 @@ class TestSpecial(unittest.TestCase):
                 NO = 0
             nope = Di.YES.NO
 
+    @unittest.skipIf(
+            python_version > (3, 13),
+            'member.member access now raises',
+            )
+    def test_warning_for_member_from_member_access(self):
+        with self.assertWarnsRegex(DeprecationWarning, '`member.member` access .* is deprecated and will be removed in 3.14'):
+            class Di(Enum):
+                YES = 1
+                NO = 0
+            warn = Di.YES.NO
+        self.assertIs(warn, Di.NO)
 
     def test_dynamic_members_with_static_methods(self):
         #