bpo-43024: improve signature (in help, etc) for functions taking sent… (GH-24331) (GH-26773)
…inel defaults
(cherry picked from commit f73377d57c5272390de63cccc3c292c44689310a)
Co-authored-by: Irit Katriel <1055913+iritkatriel@users.noreply.github.com>
diff --git a/Lib/traceback.py b/Lib/traceback.py
index 8f908dd..7a7cca1 100644
--- a/Lib/traceback.py
+++ b/Lib/traceback.py
@@ -84,8 +84,11 @@ def extract_tb(tb, limit=None):
"another exception occurred:\n\n")
-_sentinel = object()
+class _Sentinel:
+ def __repr__(self):
+ return "<implicit>"
+_sentinel = _Sentinel()
def _parse_value_tb(exc, value, tb):
if (value is _sentinel) != (tb is _sentinel):