From 8665769614183263a4370b35a4fdbe852e651e17 Mon Sep 17 00:00:00 2001
From: ROHAN WINSOR <61073765+rohanwinsor@users.noreply.github.com>
Date: Fri, 15 Aug 2025 02:56:02 +0530
Subject: [PATCH] gh-137716:  Fix double period in AttributeError message for
 invalid mock assertions (#137717)

---
 Lib/unittest/mock.py                                            | 2 +-
 .../2025-08-13-16-58-58.gh-issue-137716.ZcZSyi.rst              | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)
 create mode 100644 Misc/NEWS.d/next/Core_and_Builtins/2025-08-13-16-58-58.gh-issue-137716.ZcZSyi.rst

diff --git a/Lib/unittest/mock.py b/Lib/unittest/mock.py
index e1dbfdacf563..0bb675065538 100644
--- a/Lib/unittest/mock.py
+++ b/Lib/unittest/mock.py
@@ -700,7 +700,7 @@ class NonCallableMock(Base):
             if name.startswith(('assert', 'assret', 'asert', 'aseert', 'assrt')) or name in _ATTRIB_DENY_LIST:
                 raise AttributeError(
                     f"{name!r} is not a valid assertion. Use a spec "
-                    f"for the mock if {name!r} is meant to be an attribute.")
+                    f"for the mock if {name!r} is meant to be an attribute")
 
         with NonCallableMock._lock:
             result = self._mock_children.get(name)
diff --git a/Misc/NEWS.d/next/Core_and_Builtins/2025-08-13-16-58-58.gh-issue-137716.ZcZSyi.rst b/Misc/NEWS.d/next/Core_and_Builtins/2025-08-13-16-58-58.gh-issue-137716.ZcZSyi.rst
new file mode 100644
index 000000000000..82d8e1577905
--- /dev/null
+++ b/Misc/NEWS.d/next/Core_and_Builtins/2025-08-13-16-58-58.gh-issue-137716.ZcZSyi.rst
@@ -0,0 +1 @@
+Fix double period in :exc:`AttributeError` message for invalid mock assertions
-- 
2.47.3