From: Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com>
Date: Thu, 3 Jul 2025 10:31:43 +0000 (+0200)
Subject: [3.13] gh-135069: Fix exception message in encodings.idna module (GH-135071) (#136236)
X-Git-Tag: v3.13.6~136
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=fc77192109f8aed83382ce7f4cd6fe517c051ab2;p=thirdparty%2FPython%2Fcpython.git

[3.13] gh-135069: Fix exception message in encodings.idna module (GH-135071) (#136236)

gh-135069: Fix exception message in encodings.idna module (GH-135071)
(cherry picked from commit 8dc3383abea72ee3deafec60818aeb817d8fec09)

Co-authored-by: Daniel Hollas <daniel.hollas@bristol.ac.uk>
---

diff --git a/Lib/encodings/idna.py b/Lib/encodings/idna.py
index 60a8d5eb227f..0c90b4c9fe18 100644
--- a/Lib/encodings/idna.py
+++ b/Lib/encodings/idna.py
@@ -316,7 +316,7 @@ class IncrementalEncoder(codecs.BufferedIncrementalEncoder):
 class IncrementalDecoder(codecs.BufferedIncrementalDecoder):
     def _buffer_decode(self, input, errors, final):
         if errors != 'strict':
-            raise UnicodeError("Unsupported error handling: {errors}")
+            raise UnicodeError(f"Unsupported error handling: {errors}")
 
         if not input:
             return ("", 0)
diff --git a/Misc/NEWS.d/next/Library/2025-06-03-12-59-17.gh-issue-135069.xop30V.rst b/Misc/NEWS.d/next/Library/2025-06-03-12-59-17.gh-issue-135069.xop30V.rst
new file mode 100644
index 000000000000..1affb5e2aada
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2025-06-03-12-59-17.gh-issue-135069.xop30V.rst
@@ -0,0 +1,3 @@
+Fix the "Invalid error handling" exception in
+:class:`!encodings.idna.IncrementalDecoder` to correctly replace the
+'errors' parameter.