https://github.com/python/cpython/commit/df7247a3802f44234b923e3149b0cc11d6133bb7
commit: df7247a3802f44234b923e3149b0cc11d6133bb7
branch: 3.14
author: Miss Islington (bot) <31488909+miss-isling...@users.noreply.github.com>
committer: serhiy-storchaka <storch...@gmail.com>
date: 2025-06-01T06:21:34Z
summary:
[3.14] gh-134970: Fix exception message in argparse module (GH-134971)
(GH-134991)
Fix the "unknown action" exception in
argparse.ArgumentParser.add_argument_group()
to correctly replace the action class.
(cherry picked from commit 965c48056633d3f4b41520c8cd07f0275f00fb4c)
Co-authored-by: Michał Górny <mgo...@gentoo.org>
files:
A Misc/NEWS.d/next/Library/2025-05-31-12-08-12.gh-issue-134970.lgSaxq.rst
M Lib/argparse.py
diff --git a/Lib/argparse.py b/Lib/argparse.py
index d1a6350c3fda6d..83258cf3e0f37d 100644
--- a/Lib/argparse.py
+++ b/Lib/argparse.py
@@ -1534,7 +1534,7 @@ def add_argument(self, *args, **kwargs):
action_name = kwargs.get('action')
action_class = self._pop_action_class(kwargs)
if not callable(action_class):
- raise ValueError('unknown action {action_class!r}')
+ raise ValueError(f'unknown action {action_class!r}')
action = action_class(**kwargs)
# raise an error if action for positional argument does not
diff --git
a/Misc/NEWS.d/next/Library/2025-05-31-12-08-12.gh-issue-134970.lgSaxq.rst
b/Misc/NEWS.d/next/Library/2025-05-31-12-08-12.gh-issue-134970.lgSaxq.rst
new file mode 100644
index 00000000000000..20f53569ef4566
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2025-05-31-12-08-12.gh-issue-134970.lgSaxq.rst
@@ -0,0 +1,3 @@
+Fix the "unknown action" exception in
+:meth:`argparse.ArgumentParser.add_argument_group` to correctly replace the
+action class.
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