Use raw string to avoid deprecation warning (GH-31427)

sweeneyde · web-flow · commit 7a4791e03613 · 2022-02-19T00:57:36.000-05:00
diff --git a/Lib/test/test_property.py b/Lib/test/test_property.py
@@ -342,7 +342,7 @@ class cls:
 
 
 class PropertyUnreachableAttributeNoName(_PropertyUnreachableAttribute, unittest.TestCase):
-    msg_format = "^property of 'PropertyUnreachableAttributeNoName\.cls' object {}$"
+    msg_format = r"^property of 'PropertyUnreachableAttributeNoName\.cls' object {}$"
 
     class cls:
         pass
