bpo-45614: Fix traceback display for exceptions with invalid module name (GH-29726...

(cherry picked from commit 4dfae6f38e1720ddafcdd68043e476ecb41cb4d5)

diff --git a/Lib/test/test_traceback.py b/Lib/test/test_traceback.py
index 8d9d514d8deaaafed1508cc06a91996c61e9ef3d..c0b3388b2d363279c1fdbd4c79292d59d5b22214 100644 (file)
--- a/Lib/test/test_traceback.py
+++ b/Lib/test/test_traceback.py
@@ -740,6 +740,17 @@ class BaseExceptionReportingTests:
         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 d65a6098cc621fdde90f0dffe9fdb59d4aef620f..c771a137cd9e8103beea52b8f246ea3ec3a1868e 100644 (file)
--- a/Lib/traceback.py
+++ b/Lib/traceback.py
@@ -574,6 +574,8 @@ class TracebackException:
         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 (file)
index 0000000..4255e18
--- /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 50c59b69f31fc8ab730a7a99d430c4f3b27739ed..364101e99de2dc6ad9dd1af973efe193e1d95be9 100644 (file)
--- a/Python/pythonrun.c
+++ b/Python/pythonrun.c
@@ -903,7 +903,7 @@ 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))