[3.13] gh-59000: Fix pdb breakpoint resolution for class methods when… (#142172)

gaogaotiantian · cocolato · web-flow · commit 9d99b5b2ca1e · 2025-12-02T05:07:52.000Z
* [3.13] gh-59000: Fix pdb breakpoint resolution for class methods when module not imported (GH-141949) (cherry picked from commit 5e58548) Co-authored-by: LloydZ <35182391+cocolato@users.noreply.github.com>
diff --git a/Lib/pdb.py b/Lib/pdb.py
@@ -1262,7 +1262,9 @@ def lineinfo(self, identifier):
             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
@@ -4013,6 +4013,22 @@ def f(x):
             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
@@ -0,0 +1 @@
+Fix :mod:`pdb` breakpoint resolution for class methods when the module defining the class is not imported.

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1 @@`
	`1`	+Fix :mod:`pdb` breakpoint resolution for class methods when the module defining the class is not imported.