From cd91e0b9a55f29845b7e66e0c9d00b945988d540 Mon Sep 17 00:00:00 2001
From: Jelle Zijlstra <jelle.zijlstra@gmail.com>
Date: Tue, 19 Sep 2023 20:15:52 -0700
Subject: [PATCH] gh-109543: Remove unnecessary hasattr check (#109544)

Also added a new test case covering the scenario I thought this
might be about.
---
 Lib/test/test_typing.py                               | 11 +++++++++++
 Lib/typing.py                                         |  3 +--
 .../2023-09-18-07-43-22.gh-issue-109543.1tOGoV.rst    |  2 ++
 3 files changed, 14 insertions(+), 2 deletions(-)
 create mode 100644 Misc/NEWS.d/next/Library/2023-09-18-07-43-22.gh-issue-109543.1tOGoV.rst

diff --git a/Lib/test/test_typing.py b/Lib/test/test_typing.py
index 69f5ff913c57bb..4d1c0f2c724b86 100644
--- a/Lib/test/test_typing.py
+++ b/Lib/test/test_typing.py
@@ -7586,6 +7586,17 @@ def test_total(self):
         self.assertEqual(Options.__required_keys__, frozenset())
         self.assertEqual(Options.__optional_keys__, {'log_level', 'log_path'})
 
+    def test_total_inherits_non_total(self):
+        class TD1(TypedDict, total=False):
+            a: int
+
+        self.assertIs(TD1.__total__, False)
+
+        class TD2(TD1):
+            b: str
+
+        self.assertIs(TD2.__total__, True)
+
     def test_optional_keys(self):
         class Point2Dor3D(Point2D, total=False):
             z: int
diff --git a/Lib/typing.py b/Lib/typing.py
index 8655b756a9fd13..183d5b29a23362 100644
--- a/Lib/typing.py
+++ b/Lib/typing.py
@@ -2886,8 +2886,7 @@ def __new__(cls, name, bases, ns, total=True):
         tp_dict.__annotations__ = annotations
         tp_dict.__required_keys__ = frozenset(required_keys)
         tp_dict.__optional_keys__ = frozenset(optional_keys)
-        if not hasattr(tp_dict, '__total__'):
-            tp_dict.__total__ = total
+        tp_dict.__total__ = total
         return tp_dict
 
     __call__ = dict  # static method
diff --git a/Misc/NEWS.d/next/Library/2023-09-18-07-43-22.gh-issue-109543.1tOGoV.rst b/Misc/NEWS.d/next/Library/2023-09-18-07-43-22.gh-issue-109543.1tOGoV.rst
new file mode 100644
index 00000000000000..e790f7750c332a
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2023-09-18-07-43-22.gh-issue-109543.1tOGoV.rst
@@ -0,0 +1,2 @@
+Remove unnecessary :func:`hasattr` check during :data:`typing.TypedDict`
+creation.