[Python-checkins] [3.14] GH-132983: Remove subclassing support from zstd types (GH-133694) (#133762)

[AA-Turner]

https://github.com/python/cpython/commit/5dddedf327bc4c5b1d256d6994acdc27f4a7d6fd
commit: 5dddedf327bc4c5b1d256d6994acdc27f4a7d6fd
branch: 3.14
author: Miss Islington (bot) <31488909+miss-isling...@users.noreply.github.com>
committer: AA-Turner <9087854+aa-tur...@users.noreply.github.com>
date: 2025-05-09T14:43:52Z
summary:

[3.14] GH-132983: Remove subclassing support from zstd types (GH-133694) 
(#133762)

GH-132983: Remove subclassing support from zstd types (GH-133694)

For consistency with ``bz2``, ``lzma``, and ``zlib``.
(cherry picked from commit bd7c5859c6c4f23877afdf6ab7b8209de50127a6)

Co-authored-by: Adam Turner <9087854+aa-tur...@users.noreply.github.com>

files:
M Modules/_zstd/compressor.c
M Modules/_zstd/decompressor.c
M Modules/_zstd/zstddict.c

diff --git a/Modules/_zstd/compressor.c b/Modules/_zstd/compressor.c
index 9a3d8dedcf235e..fc1d3b9d210639 100644
--- a/Modules/_zstd/compressor.c
+++ b/Modules/_zstd/compressor.c
@@ -702,6 +702,6 @@ static PyType_Slot zstdcompressor_slots[] = {
 PyType_Spec zstdcompressor_type_spec = {
     .name = "_zstd.ZstdCompressor",
     .basicsize = sizeof(ZstdCompressor),
-    .flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HAVE_GC,
+    .flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,
     .slots = zstdcompressor_slots,
 };
diff --git a/Modules/_zstd/decompressor.c b/Modules/_zstd/decompressor.c
index dec917481ab1b5..4ac28d9c987d82 100644
--- a/Modules/_zstd/decompressor.c
+++ b/Modules/_zstd/decompressor.c
@@ -886,6 +886,6 @@ static PyType_Slot ZstdDecompressor_slots[] = {
 PyType_Spec zstddecompressor_type_spec = {
     .name = "_zstd.ZstdDecompressor",
     .basicsize = sizeof(ZstdDecompressor),
-    .flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HAVE_GC,
+    .flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,
     .slots = ZstdDecompressor_slots,
 };
diff --git a/Modules/_zstd/zstddict.c b/Modules/_zstd/zstddict.c
index a19224c4a6403b..53c96b104104e0 100644
--- a/Modules/_zstd/zstddict.c
+++ b/Modules/_zstd/zstddict.c
@@ -281,6 +281,6 @@ static PyType_Slot zstddict_slots[] = {
 PyType_Spec zstddict_type_spec = {
     .name = "_zstd.ZstdDict",
     .basicsize = sizeof(ZstdDict),
-    .flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HAVE_GC,
+    .flags = Py_TPFLAGS_DEFAULT | Py_TPFLAGS_HAVE_GC,
     .slots = zstddict_slots,
 };

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