From: Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com>
Date: Sat, 18 Jul 2026 07:21:46 +0000 (+0200)
Subject: [3.15] gh-150583: Fix zstd compression level with digested ZstdDict (GH-150586) ... 
X-Git-Tag: v3.15.0b4~1
X-Git-Url: http://git.ipfire.org/index.cgi?a=commitdiff_plain;h=c642dc83cc6da32f255b1537959b10f320ceff92;p=thirdparty%2FPython%2Fcpython.git

[3.15] gh-150583: Fix zstd compression level with digested ZstdDict (GH-150586) (#153883)

gh-150583: Fix zstd compression level with digested ZstdDict (GH-150586)
(cherry picked from commit 0983642c966d9c536416101e99b7d2b085483847)

Co-authored-by: Rogdham <3994389+Rogdham@users.noreply.github.com>
---

diff --git a/Misc/NEWS.d/next/Library/2026-06-03-19-35-32.gh-issue-150583.dedI24.rst b/Misc/NEWS.d/next/Library/2026-06-03-19-35-32.gh-issue-150583.dedI24.rst
new file mode 100644
index 000000000000..edb551b3c3c8
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2026-06-03-19-35-32.gh-issue-150583.dedI24.rst
@@ -0,0 +1,2 @@
+Correctly set the default compression level in :mod:`compression.zstd` when passing a digested
+dictionary during compression.
diff --git a/Modules/_zstd/compressor.c b/Modules/_zstd/compressor.c
index b2eb22d9ec8a..894568fce28d 100644
--- a/Modules/_zstd/compressor.c
+++ b/Modules/_zstd/compressor.c
@@ -347,6 +347,7 @@ _zstd_ZstdCompressor_new_impl(PyTypeObject *type, PyObject *level,
     }
 
     self->use_multithread = 0;
+    self->compression_level = ZSTD_CLEVEL_DEFAULT;
     self->dict = NULL;
     self->lock = (PyMutex){0};