gh-130250: fix regression in traceback.print_last (#130318)

diff --git a/Doc/library/traceback.rst b/Doc/library/traceback.rst
index 7e05144bfb34cbb05a4970553c64658cbd1f932d..3475b014634d58e871f77f1e1b30cb3c90fb8d4e 100644 (file)
--- a/Doc/library/traceback.rst
+++ b/Doc/library/traceback.rst
@@ -115,14 +115,14 @@ Module-Level Functions
 
 .. function:: print_exc(limit=None, file=None, chain=True)
 
-   This is a shorthand for ``print_exception(sys.exception(), limit, file,
-   chain)``.
+   This is a shorthand for ``print_exception(sys.exception(), limit=limit, file=file,
+   chain=chain)``.
 
 
 .. function:: print_last(limit=None, file=None, chain=True)
 
-   This is a shorthand for ``print_exception(sys.last_exc, limit, file,
-   chain)``.  In general it will work only after an exception has reached
+   This is a shorthand for ``print_exception(sys.last_exc, limit=limit, file=file,
+   chain=chain)``.  In general it will work only after an exception has reached
    an interactive prompt (see :data:`sys.last_exc`).
 
 

diff --git a/Lib/test/test_traceback.py b/Lib/test/test_traceback.py
index c2b115b53889d360516c22ee52f171c332346d38..58f28902686a17cd601afc24bea02297332ec1bb 100644 (file)
--- a/Lib/test/test_traceback.py
+++ b/Lib/test/test_traceback.py
@@ -510,6 +510,13 @@ class TracebackCases(unittest.TestCase):
         traceback.print_exception(Exception("projector"), file=output)
         self.assertEqual(output.getvalue(), "Exception: projector\n")
 
+    def test_print_last(self):
+        self.assertIsNone(getattr(sys, "last_exc", None))
+        sys.last_exc = ValueError(42)
+        output = StringIO()
+        traceback.print_last(file=output)
+        self.assertEqual(output.getvalue(), "ValueError: 42\n")
+
     def test_format_exception_exc(self):
         e = Exception("projector")
         output = traceback.format_exception(e)

diff --git a/Lib/traceback.py b/Lib/traceback.py
index 2b402dd4cc2401ee3ab4ae746f7ceb141ee4214f..38ea5b4bdccf6d7dc01fcaa71bcd0f39be0bceb6 100644 (file)
--- a/Lib/traceback.py
+++ b/Lib/traceback.py
@@ -204,7 +204,7 @@ def _safe_string(value, what, func=str):
 # --
 
 def print_exc(limit=None, file=None, chain=True):
-    """Shorthand for 'print_exception(sys.exception(), limit, file, chain)'."""
+    """Shorthand for 'print_exception(sys.exception(), limit=limit, file=file, chain=chain)'."""
     print_exception(sys.exception(), limit=limit, file=file, chain=chain)
 
 def format_exc(limit=None, chain=True):
@@ -212,15 +212,15 @@ def format_exc(limit=None, chain=True):
     return "".join(format_exception(sys.exception(), limit=limit, chain=chain))
 
 def print_last(limit=None, file=None, chain=True):
-    """This is a shorthand for 'print_exception(sys.last_exc, limit, file, chain)'."""
+    """This is a shorthand for 'print_exception(sys.last_exc, limit=limit, file=file, chain=chain)'."""
     if not hasattr(sys, "last_exc") and not hasattr(sys, "last_type"):
         raise ValueError("no last exception")
 
     if hasattr(sys, "last_exc"):
-        print_exception(sys.last_exc, limit, file, chain)
+        print_exception(sys.last_exc, limit=limit, file=file, chain=chain)
     else:
         print_exception(sys.last_type, sys.last_value, sys.last_traceback,
-                        limit, file, chain)
+                        limit=limit, file=file, chain=chain)
 
 
 #

diff --git a/Misc/NEWS.d/next/Library/2025-02-19-19-29-19.gh-issue-130250.T00tql.rst b/Misc/NEWS.d/next/Library/2025-02-19-19-29-19.gh-issue-130250.T00tql.rst
new file mode 100644 (file)
index 0000000..10ffb9d
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2025-02-19-19-29-19.gh-issue-130250.T00tql.rst
@@ -0,0 +1 @@
+Fix regression in ``traceback.print_last()``.