From de9e4dc2461f1d8a05a830dce3ad44e895deaf25 Mon Sep 17 00:00:00 2001
From: Irit Katriel <1055913+iritkatriel@users.noreply.github.com>
Date: Sat, 27 Nov 2021 22:00:10 +0000
Subject: [PATCH] bpo-45614: Fix traceback display for exceptions with invalid
 module name (GH-29726)

(cherry picked from commit 4dfae6f38e1720ddafcdd68043e476ecb41cb4d5)
---
 Lib/test/test_traceback.py                            | 11 +++++++++++
 Lib/traceback.py                                      |  2 ++
 .../2021-11-23-12-06-41.bpo-45614.fIekgI.rst          |  1 +
 Python/pythonrun.c                                    |  2 +-
 4 files changed, 15 insertions(+), 1 deletion(-)
 create mode 100644 Misc/NEWS.d/next/Core and Builtins/2021-11-23-12-06-41.bpo-45614.fIekgI.rst

diff --git a/Lib/test/test_traceback.py b/Lib/test/test_traceback.py
index ba03ce46294c57..18cd4aba24af26 100644
--- a/Lib/test/test_traceback.py
+++ b/Lib/test/test_traceback.py
@@ -785,6 +785,17 @@ def test_message_none(self):
         err = self.get_report(Exception(''))
         self.assertIn('Exception\n', err)
 
+    def test_exception_modulename_not_unicode(self):
+        class X(Exception):
+            def __str__(self):
+                return "I am X"
+
+        X.__module__ = 42
+
+        err = self.get_report(X())
+        exp = f'<unknown>.{X.__qualname__}: I am X\n'
+        self.assertEqual(exp, err)
+
     def test_syntax_error_various_offsets(self):
         for offset in range(-5, 10):
             for add in [0, 2]:
diff --git a/Lib/traceback.py b/Lib/traceback.py
index 901b99476aaf85..d6a010f4157582 100644
--- a/Lib/traceback.py
+++ b/Lib/traceback.py
@@ -604,6 +604,8 @@ def format_exception_only(self):
         stype = self.exc_type.__qualname__
         smod = self.exc_type.__module__
         if smod not in ("__main__", "builtins"):
+            if not isinstance(smod, str):
+                smod = "<unknown>"
             stype = smod + '.' + stype
 
         if not issubclass(self.exc_type, SyntaxError):
diff --git a/Misc/NEWS.d/next/Core and Builtins/2021-11-23-12-06-41.bpo-45614.fIekgI.rst b/Misc/NEWS.d/next/Core and Builtins/2021-11-23-12-06-41.bpo-45614.fIekgI.rst
new file mode 100644
index 00000000000000..4255e1885ad67c
--- /dev/null
+++ b/Misc/NEWS.d/next/Core and Builtins/2021-11-23-12-06-41.bpo-45614.fIekgI.rst	
@@ -0,0 +1 @@
+Fix :mod:`traceback` display for exceptions with invalid module name.
\ No newline at end of file
diff --git a/Python/pythonrun.c b/Python/pythonrun.c
index 5704bcc7589f32..0f1794acec73ae 100644
--- a/Python/pythonrun.c
+++ b/Python/pythonrun.c
@@ -972,7 +972,7 @@ print_exception(PyObject *f, PyObject *value)
         {
             Py_XDECREF(modulename);
             PyErr_Clear();
-            err = PyFile_WriteString("<unknown>", f);
+            err = PyFile_WriteString("<unknown>.", f);
         }
         else {
             if (!_PyUnicode_EqualToASCIIId(modulename, &PyId_builtins))