From 9d99b5b2ca1e424e9082a5ef145453708d75f32f Mon Sep 17 00:00:00 2001
From: Tian Gao <gaogaotiantian@hotmail.com>
Date: Mon, 1 Dec 2025 21:07:52 -0800
Subject: [PATCH] =?utf8?q?[3.13]=20gh-59000:=20Fix=20pdb=20breakpoint=20re?=
 =?utf8?q?solution=20for=20class=20methods=20when=E2=80=A6=20(#142172)?=
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* [3.13] gh-59000: Fix pdb breakpoint resolution for class methods when module not imported (GH-141949)
(cherry picked from commit 5e58548ebe8f7ac8c6cb0bad775912caa4090515)

Co-authored-by: LloydZ <35182391+cocolato@users.noreply.github.com>
---
 Lib/pdb.py                                       |  4 +++-
 Lib/test/test_pdb.py                             | 16 ++++++++++++++++
 ...2025-11-25-16-00-29.gh-issue-59000.YtOyJy.rst |  1 +
 3 files changed, 20 insertions(+), 1 deletion(-)
 create mode 100644 Misc/NEWS.d/next/Library/2025-11-25-16-00-29.gh-issue-59000.YtOyJy.rst

diff --git a/Lib/pdb.py b/Lib/pdb.py
index a990d60fe1c2..063b12cc856c 100755
--- a/Lib/pdb.py
+++ b/Lib/pdb.py
@@ -1262,7 +1262,9 @@ class Pdb(bdb.Bdb, cmd.Cmd):
             f = self.lookupmodule(parts[0])
             if f:
                 fname = f
-            item = parts[1]
+                item = parts[1]
+            else:
+                return failed
         answer = find_function(item, self.canonic(fname))
         return answer or failed
 
diff --git a/Lib/test/test_pdb.py b/Lib/test/test_pdb.py
index 92a0180ecc9a..dd31649ab262 100644
--- a/Lib/test/test_pdb.py
+++ b/Lib/test/test_pdb.py
@@ -4013,6 +4013,22 @@ def bœr():
             self.assertIn('42', stdout)
             self.assertIn('return x + 1', stdout)
 
+    def test_issue_59000(self):
+        script = """
+            def foo():
+                pass
+
+            class C:
+                def foo(self):
+                    pass
+        """
+        commands = """
+            break C.foo
+            quit
+        """
+        stdout, stderr = self.run_pdb_script(script, commands)
+        self.assertIn("The specified object 'C.foo' is not a function", stdout)
+
 
 class ChecklineTests(unittest.TestCase):
     def setUp(self):
diff --git a/Misc/NEWS.d/next/Library/2025-11-25-16-00-29.gh-issue-59000.YtOyJy.rst b/Misc/NEWS.d/next/Library/2025-11-25-16-00-29.gh-issue-59000.YtOyJy.rst
new file mode 100644
index 000000000000..33ab8a0659e4
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2025-11-25-16-00-29.gh-issue-59000.YtOyJy.rst
@@ -0,0 +1 @@
+Fix :mod:`pdb` breakpoint resolution for class methods when the module defining the class is not imported.
-- 
2.47.3