https://github.com/python/cpython/commit/2674c322c6cc5a81ce54d807c64cb0e221521786
commit: 2674c322c6cc5a81ce54d807c64cb0e221521786
branch: main
author: Stelar <[email protected]>
committer: JelleZijlstra <[email protected]>
date: 2026-04-28T16:50:53-07:00
summary:
gh-149119: docs: mention that sentinel does not support subclassing (#149120)
Add note about sentinel objects not supporting subclassing
Clarify that sentinel objects do not support subclassing.
files:
M Doc/library/functions.rst
diff --git a/Doc/library/functions.rst b/Doc/library/functions.rst
index aa99d198e436d5..06fd5cdc7be2a6 100644
--- a/Doc/library/functions.rst
+++ b/Doc/library/functions.rst
@@ -1839,6 +1839,8 @@ are always available. They are listed here in
alphabetical order.
Sentinel objects are truthy and compare equal only to themselves. They are
intended to be compared with the :keyword:`is` operator.
+ ``sentinel`` does not support subclassing.
+
Shallow and deep copies of a sentinel object return the object itself.
Sentinels are conventionally assigned to a variable with a matching name.
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