From ab038ba5a47c94d48a126223b58ab1ddb365e0b5 Mon Sep 17 00:00:00 2001
From: Harry Kwon <harrykwon20@gmail.com>
Date: Fri, 15 Aug 2025 14:29:52 +0900
Subject: [PATCH 1/2] add tests for current formatter behavior on exc_text

---
 Lib/test/test_logging.py | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/Lib/test/test_logging.py b/Lib/test/test_logging.py
index 275f7ce47d09b5..1dc627ff0b5c76 100644
--- a/Lib/test/test_logging.py
+++ b/Lib/test/test_logging.py
@@ -4570,6 +4570,9 @@ def setUp(self):
         self.variants = {
             'custom': {
                 'custom': 1234
+            },
+            'exception': {
+                'exc_info': ZeroDivisionError()
             }
         }
 
@@ -4909,6 +4912,20 @@ def test_relativeCreated_has_higher_precision(self):
                 # After PR gh-102412, precision (places) increases from 3 to 7
                 self.assertAlmostEqual(relativeCreated, offset_ns / 1e6, places=7)
 
+    def test_multiple_formatters_exc_text(self):
+        # Regression test for current behavior where exc_text is only set if it is None
+        r = self.get_record()
+        r.exc_info = (ZeroDivisionError, ZeroDivisionError(), None)
+
+        f = logging.Formatter('${%(message)s}')
+        f.format(r)
+        self.assertIsNotNone(r.exc_text)
+        exc_text = r.exc_text
+
+        f = logging.Formatter('%(asctime)s')
+        f.format(r)
+        self.assertEqual(exc_text, r.exc_text)
+
 
 class TestBufferingFormatter(logging.BufferingFormatter):
     def formatHeader(self, records):
@@ -5010,7 +5027,6 @@ def inner():
 
 
 class RecordingHandler(logging.NullHandler):
-
     def __init__(self, *args, **kwargs):
         super(RecordingHandler, self).__init__(*args, **kwargs)
         self.records = []

From 1f468f129c67ff02d2a7a295b47128964f3ee7e8 Mon Sep 17 00:00:00 2001
From: Harry Kwon <harrykwon20@gmail.com>
Date: Fri, 15 Aug 2025 14:32:21 +0900
Subject: [PATCH 2/2] Add test for proposed override behavior

---
 Lib/test/test_logging.py | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/Lib/test/test_logging.py b/Lib/test/test_logging.py
index 1dc627ff0b5c76..95f0f2494aca7e 100644
--- a/Lib/test/test_logging.py
+++ b/Lib/test/test_logging.py
@@ -4926,6 +4926,20 @@ def test_multiple_formatters_exc_text(self):
         f.format(r)
         self.assertEqual(exc_text, r.exc_text)
 
+    def test_multiple_formatters_set_exc_text(self):
+        # Tests that exc_text is changed when set_exc_text option is set on the Formatter
+        r = self.get_record()
+        r.exc_info = (ZeroDivisionError, ZeroDivisionError(), None)
+
+        f = logging.Formatter('${%(message)s}')
+        f.format(r)
+        self.assertIsNotNone(r.exc_text)
+        exc_text = r.exc_text
+
+        f = logging.Formatter('%(asctime)s', set_exc_text=True)
+        f.format(r)
+        self.assertNotEqual(exc_text, r.exc_text)
+
 
 class TestBufferingFormatter(logging.BufferingFormatter):
     def formatHeader(self, records):