gh-139531: Fix TypeError in inspect.getframeinfo when lineno is None

Lib/inspect.py

@@ -1582,6 +1582,9 @@ def getframeinfo(frame, context=1):
 
     lineno = positions[0]
 
+    if lineno is None:
+        lineno = 1
+
     if not isframe(frame):
         raise TypeError('{!r} is not a frame or traceback object'.format(frame))
 

Lib/test/test_inspect/test_inspect.py

@@ -28,6 +28,7 @@
 import unittest.mock
 import warnings
 import weakref
+import unittest
 
 
 try:
@@ -6245,8 +6246,22 @@ def f():
         expected = "The source is: <<<def f():\n    print(0)\n    return 1 + 2\n>>>"
         self.assertIn(expected, output)
 
-
-
+class TestInspect(unittest.TestCase):
+    def test_getframeinfo_with_exceptiongroup(self):
+        code = """
+try:
+    1/0
+except* Exception:
+    raise
+"""
+        with self.assertRaises(TypeError):  # expect the bug to raise TypeError
+            try:
+                exec(code)
+            except:
+                tb = sys.exc_info()[2]
+                while tb:
+                    info = inspect.getframeinfo(tb.tb_frame)
+                    tb = tb.tb_next
 
 if __name__ == "__main__":
     unittest.main()

Misc/NEWS.d/next/139531.bpo

@@ -0,0 +1 @@
+Fix TypeError in inspect.getframeinfo when lineno is None (gh-139531, #139535).

Misc/NEWS.d/next/Tests/2025-10-03-07-24-36.gh-issue-139531.jOs0fO.rst

@@ -0,0 +1 @@
+gh-139531: Fix TypeError in inspect.getframeinfo when lineno is None #139535

Misc/mypy/_colorize.py

@@ -1 +1 @@
-../../Lib/_colorize.py
+../../Lib/_colorize.py

Misc/mypy/token.py

@@ -1 +1 @@
-../../Lib/token.py
+../../Lib/token.py