Hello, this email is a notification from the Auto Upgrade Helper that the automatic attempt to upgrade the recipe(s) *python3-cython* to *3.3.0* has Succeeded.
Next steps:
- apply the patch: git am 0001-python3-cython-upgrade-3.2.9-3.3.0.patch
- check the changes to upstream patches and summarize them in the commit
message,
- compile an image that contains the package
- perform some basic sanity tests
- amend the patch and sign it off: git commit -s --reset-author --amend
- send it to the appropriate mailing list
Alternatively, if you believe the recipe should not be upgraded at this time,
you can fill RECIPE_NO_UPDATE_REASON in respective recipe file so that
automatic upgrades would no longer be attempted.
Please review the attached files for further information and build/update
failures.
Any problem please file a bug at
https://bugzilla.yoctoproject.org/enter_bug.cgi?product=Automated%20Update%20Handler
Regards,
The Upgrade Helper
-- >8 --
>From 11ce78ab83c6fa1c6762e7d35fbf6f417429750d Mon Sep 17 00:00:00 2001
From: Upgrade Helper <[email protected]>
Date: Sun, 23 Aug 2026 05:15:55 +0000
Subject: [PATCH] python3-cython: upgrade 3.2.9 -> 3.3.0
Source: CHANGES.rst
3.3.0 (2026-08-22)
==================
(Complete changelog for the 3.3.0 release, including pre-releases.)
Features added
--------------
* PEP-634 Pattern Matching is implemented.
(Github issue :issue:`4029`)
* ``except *`` (PEP-654 exception groups) is implemented for Python 3.11 and
later.
(Github issue :issue:`4993`)
* Unpacking in comprehensions (PEP-798) is implemented for list/set/dict
comprehensions.
It is not yet available for generator expressions.
Original patch by Morax. (Github issue :issue:`7898`)
* Changes were made to adapt to Python 3.15 and its Limited API.
This does not yet cover ``abi3t``.
(Github issues :issue:`6405`, :issue:`7190`, :issue:`7347`, :issue:`7348`,
:issue:`7358`)
* Cython now uses a new export/import naming scheme for fused C functions that
increases the resilience against seemingly compatible user code changes.
The original names are kept for backwards compatibility.
(Github issue :issue:`7656`)
* Declared container item types (e.g. ``list[float]`` or ``tuple[atype, ...]``)
are now used by the type system.
(Github issues :issue:`7288`, :issue:`7798`)
* Type inference was improved for builtin Python types and their methods.
(Github issues :issue:`7536`, :issue:`7644`, :issue:`7887`, :issue:`7888`)
* Exception base types are inferred for the target variable of multi-exception
``except``
clauses and for collections of exceptions. Properties like ``.args`` and
``.context``
use direct C access in CPython.
(Github issue :issue:`7783`)
* Annotations on global variables are now used by type inference.
(Github issue :issue:`7877`)
* The feature set of the shared module can be selected at build time
by listing named features to include or exclude.
This is an experimental configuration, subject to further improvements.
Failures to include used features will currently result in import failures.
(Github issue :issue:`7759`)
* To control the generation of the shared module, the ``cython`` command gained
a sub-command ``cython generate-shared pkg/modulename.c`` with additional
options
``--only`` and ``--exclude``.
Patch by Raza Khan. (Github issue :issue:`7842`)
* Conditions in strongly predictable if-clauses or if-else expressions can be
wrapped in
``cython.likely(condition)`` or ``cython.unlikely(condition)`` to help the C
compiler
optimise the branch. Note that Cython automatically detects ``raise`` and
``assert``
statements as terminators already and marks if-clauses that directly lead to
them as
``unlikely()``, without user interaction.
(Github issue :issue:`7667`)
* Extension types can declare themselves explicitly as sequence or mapping with
``@cython.collection_type("sequence")`` or
``@cython.collection_type("mapping")``.
This has an effect on their behaviour in pattern matching and subscripting.
(Github issue :issue:`5027`)
* Sequence types marked as ``@cython.collection_type("sequence")`` that use C
integers
in the
[Changelog truncated as it exceeds 3000 characters;
the full changelog can be found in an attachment to the AUH email]
---
...place-not-predictable-build-path-prefix-with-hardc.patch | 6 +++---
.../{python3-cython_3.2.9.bb => python3-cython_3.3.0.bb} | 2 +-
2 files changed, 4 insertions(+), 4 deletions(-)
rename meta/recipes-devtools/python/{python3-cython_3.2.9.bb =>
python3-cython_3.3.0.bb} (93%)
diff --git
a/meta/recipes-devtools/python/python3-cython/0001-Replace-not-predictable-build-path-prefix-with-hardc.patch
b/meta/recipes-devtools/python/python3-cython/0001-Replace-not-predictable-build-path-prefix-with-hardc.patch
index 573a53ee56..91afbea089 100644
---
a/meta/recipes-devtools/python/python3-cython/0001-Replace-not-predictable-build-path-prefix-with-hardc.patch
+++
b/meta/recipes-devtools/python/python3-cython/0001-Replace-not-predictable-build-path-prefix-with-hardc.patch
@@ -1,4 +1,4 @@
-From a3b9d4303b6aaf5ef2ce9ffd1ba42a93f9cc68e0 Mon Sep 17 00:00:00 2001
+From 07a9271f8d6e07d3eed92365ba1066ed40aee01b Mon Sep 17 00:00:00 2001
From: Hongxu Jia <[email protected]>
Date: Wed, 17 Sep 2025 01:42:08 -0700
Subject: [PATCH] Replace not predictable build path prefix with hardcode
@@ -53,10 +53,10 @@ Signed-off-by: Hongxu Jia <[email protected]>
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/Cython/Compiler/ModuleNode.py b/Cython/Compiler/ModuleNode.py
-index 34f1b32..b09350b 100644
+index 6e0a3e5..ce35b25 100644
--- a/Cython/Compiler/ModuleNode.py
+++ b/Cython/Compiler/ModuleNode.py
-@@ -877,7 +877,9 @@ class ModuleNode(Nodes.Node, Nodes.BlockNode):
+@@ -888,7 +888,9 @@ class ModuleNode(Nodes.Node, Nodes.BlockNode):
code.put_generated_by()
if metadata:
code.putln("/* BEGIN: Cython Metadata")
diff --git a/meta/recipes-devtools/python/python3-cython_3.2.9.bb
b/meta/recipes-devtools/python/python3-cython_3.3.0.bb
similarity index 93%
rename from meta/recipes-devtools/python/python3-cython_3.2.9.bb
rename to meta/recipes-devtools/python/python3-cython_3.3.0.bb
index 3457a91490..7992892e60 100644
--- a/meta/recipes-devtools/python/python3-cython_3.2.9.bb
+++ b/meta/recipes-devtools/python/python3-cython_3.3.0.bb
@@ -7,7 +7,7 @@ SECTION = "devel/python"
LICENSE = "Apache-2.0"
LIC_FILES_CHKSUM = "file://LICENSE.txt;md5=61c3ee8961575861fa86c7e62bc9f69c"
-SRC_URI[sha256sum] =
"d249c9022ab13286b17bd66f30609e800c5f95efeecb06168990c7a66cecde6c"
+SRC_URI[sha256sum] =
"eed0d93fbca7087f143b42c34b05a825849bdf17f101572c2105acfa49aa88b8"
inherit pypi setuptools3 cython
--
2.47.1
packages/x86-64-v3-poky-linux/python3-cython/python3-cython: FILELIST: directory renamed /usr/lib/python3.14/site-packages/cython-3.2.9.dist-info -> /usr/lib/python3.14/site-packages/cython-3.3.0.dist-info, removed "/usr/lib/python3.14/site-packages/Cython/__init__.pyi /usr/lib/python3.14/site-packages/Cython/Shadow.pyi /usr/lib/python3.14/site-packages/Cython/Utility/Printing.c", added "/usr/lib/python3.14/site-packages/Cython/Utility/Exceptions_Cy.pyx /usr/lib/python3.14/site-packages/Cython/Includes/cpython/sentinel.pxd /usr/lib/python3.14/site-packages/Cython/Utility/MatchCase_Cy.pyx /usr/lib/python3.14/site-packages/Cython/LZSS.cpython-314-x86_64-linux-gnu.so /usr/lib/python3.14/site-packages/Cython/__pycache__/LZSS.cpython-314.pyc /usr/lib/python3.14/site-packages/Cython/Utility/MatchCase.c /usr/lib/python3.14/site-packages/Cython/LZSS.py /usr/lib/python3.14/site-packages/Cython/Includes/cpython/frozendict.pxd /usr/lib/python3.14/site-packages/Cython/_shared.cpython-314-x86_64- linux-gnu.so /usr/lib/python3.14/site-packages/Cython/Compiler/StringEncoding.cpython-314-x86_64-linux-gnu.so" Changes to packages/x86-64-v3-poky-linux/python3-cython (sysroot): /usr/lib/python3.14/site-packages/cython-3.2.9.dist-info moved to /usr/lib/python3.14/site-packages/cython-3.3.0.dist-info /usr/lib/python3.14/site-packages/Cython/Compiler/StringEncoding.cpython-314-x86_64-linux-gnu.so was added /usr/lib/python3.14/site-packages/Cython/Includes/cpython/frozendict.pxd was added /usr/lib/python3.14/site-packages/Cython/Includes/cpython/sentinel.pxd was added /usr/lib/python3.14/site-packages/Cython/LZSS.cpython-314-x86_64-linux-gnu.so was added /usr/lib/python3.14/site-packages/Cython/LZSS.py was added /usr/lib/python3.14/site-packages/Cython/__pycache__/LZSS.cpython-314.pyc was added /usr/lib/python3.14/site-packages/Cython/_shared.cpython-314-x86_64-linux-gnu.so was added /usr/lib/python3.14/site-packages/Cython/Utility/Exceptions_Cy.pyx was added /usr/lib/python3.14/site-packages/Cython/Utility/MatchCase.c was added /usr/lib/python3.14/site-packages/Cython/Utility/MatchCase_Cy.pyx was added /usr/lib/python3.14/site-packages/Cython/__init__.pyi was removed /usr/lib/python3.14/site-packages/Cython/Shadow.pyi was removed /usr/lib/python3.14/site-packages/Cython/Utility/Printing.c was removed
packages/x86-64-v3-poky-linux/python3-cython: SRC_URI changed from "https://files.pythonhosted.org/packages/source/c/cython/cython-3.2.9.tar.gz;downloadfilename=cython-3.2.9.tar.gz file://0001-Replace-not-predictable-build-path-prefix-with-hardc.patch" to "https://files.pythonhosted.org/packages/source/c/cython/cython-3.3.0.tar.gz;downloadfilename=cython-3.3.0.tar.gz file://0001-Replace-not-predictable-build-path-prefix-with-hardc.patch" packages/x86-64-v3-poky-linux/python3-cython: PKGV changed from 3.2.9 [default] to 3.3.0 [default] packages/x86-64-v3-poky-linux/python3-cython: PV changed from "3.2.9" to "3.3.0" packages/x86-64-v3-poky-linux/python3-cython/python3-cython-dbg: PKGSIZE changed from 27467952 to 27914992 (+2%) packages/x86-64-v3-poky-linux/python3-cython/python3-cython-dbg: FILELIST: added "/usr/lib/python3.14/site-packages/Cython/.debug/LZSS.cpython-314-x86_64-linux-gnu.so /usr/lib/python3.14/site-packages/Cython/.debug/_shared.cpython-314-x86_64-linux-gnu.so /usr/lib/python3.14/site-packages/Cython/Compiler/.debug/StringEncoding.cpython-314-x86_64-linux-gnu.so" packages/x86-64-v3-poky-linux/python3-cython/python3-cython-dbg: PKGV changed from 3.2.9 [default] to 3.3.0 [default] packages/x86-64-v3-poky-linux/python3-cython/python3-cython-dbg: PV changed from "3.2.9" to "3.3.0" packages/x86-64-v3-poky-linux/python3-cython/python3-cython-dev: PKGV changed from 3.2.9 [default] to 3.3.0 [default] packages/x86-64-v3-poky-linux/python3-cython/python3-cython-dev: PV changed from "3.2.9" to "3.3.0" packages/x86-64-v3-poky-linux/python3-cython/python3-cython-doc: PKGV changed from 3.2.9 [default] to 3.3.0 [default] packages/x86-64-v3-poky-linux/python3-cython/python3-cython-doc: PV changed from "3.2.9" to "3.3.0" packages/x86-64-v3-poky-linux/python3-cython/python3-cython-locale: PKGV changed from 3.2.9 [default] to 3.3.0 [default] packages/x86-64-v3-poky-linux/python3-cython/python3-cython-locale: PV changed from "3.2.9" to "3.3.0" packages/x86-64-v3-poky-linux/python3-cython/python3-cython-src: PKGSIZE changed from 23866107 to 26112107 (+9%) packages/x86-64-v3-poky-linux/python3-cython/python3-cython-src: FILELIST: directory renamed /usr/src/debug/python3-cython/3.2.9/Cython/Runtime -> /usr/src/debug/python3-cython/3.3.0/Cython/Runtime, directory renamed /usr/src/debug/python3-cython/3.2.9/Cython/Plex -> /usr/src/debug/python3-cython/3.3.0/Cython/Plex, directory renamed /usr/src/debug/python3-cython/3.2.9/Cython/Tempita -> /usr/src/debug/python3-cython/3.3.0/Cython/Tempita, removed "/usr/src/debug/python3-cython/3.2.9/Cython/Compiler/Scanning.c /usr/src/debug/python3-cython/3.2.9/Cython/Utils.c /usr/src/debug/python3-cython/3.2.9/Cython/Compiler/FusedNode.c /usr/src/debug/python3-cython/3.2.9/Cython/Compiler/Code.c /usr/src/debug/python3-cython/3.2.9/Cython/Compiler/FlowControl.c /usr/src/debug/python3-cython/3.2.9/Cython/Compiler/LineTable.c /usr/src/debug/python3-cython/3.2.9/Cython/Compiler/Visitor.c /usr/src/debug/python3-cython/3.2.9/Cython/StringIOTree.c /usr/src/debug/python3-cython/3.2.9/Cython/Compiler/Parsing.c ", added "/usr/src/debug/python3-cython/3.3.0/Cython/Compiler/Code.c /usr/src/debug/python3-cython/3.3.0/Cython/LZSS.c /usr/src/debug/python3-cython/3.3.0/Cython/Compiler/FusedNode.c /usr/src/debug/python3-cython/3.3.0/Cython/_shared.c /usr/src/debug/python3-cython/3.3.0/Cython/StringIOTree.c /usr/src/debug/python3-cython/3.3.0/Cython/Utils.c /usr/src/debug/python3-cython/3.3.0/Cython/Compiler/Parsing.c /usr/src/debug/python3-cython/3.3.0/Cython/Compiler/Visitor.c /usr/src/debug/python3-cython/3.3.0/Cython/Compiler/Scanning.c /usr/src/debug/python3-cython/3.3.0/Cython/Compiler/LineTable.c /usr/src/debug/python3-cython/3.3.0/Cython/Compiler/FlowControl.c /usr/src/debug/python3-cython/3.3.0/Cython/Compiler/StringEncoding.c" packages/x86-64-v3-poky-linux/python3-cython/python3-cython-src: PKGV changed from 3.2.9 [default] to 3.3.0 [default] packages/x86-64-v3-poky-linux/python3-cython/python3-cython-src: PV changed from "3.2.9" to "3.3.0" packages/x86-64-v3-poky-linux/python3-cython/python3-cython-staticdev: PKGV changed from 3.2.9 [default] to 3.3.0 [default] packages/x86-64-v3-poky-linux/python3-cython/python3-cython-staticdev: PV changed from "3.2.9" to "3.3.0" packages/x86-64-v3-poky-linux/python3-cython/python3-cython: PKGSIZE changed from 15370086 to 16167909 (+5%) packages/x86-64-v3-poky-linux/python3-cython/python3-cython: FILELIST: directory renamed /usr/lib/python3.14/site-packages/cython-3.2.9.dist-info -> /usr/lib/python3.14/site-packages/cython-3.3.0.dist-info, removed "/usr/lib/python3.14/site-packages/Cython/Utility/Printing.c /usr/lib/python3.14/site-packages/Cython/Shadow.pyi /usr/lib/python3.14/site-packages/Cython/__init__.pyi", added "/usr/lib/python3.14/site-packages/Cython/LZSS.cpython-314-x86_64-linux-gnu.so /usr/lib/python3.14/site-packages/Cython/Includes/cpython/sentinel.pxd /usr/lib/python3.14/site-packages/Cython/LZSS.py /usr/lib/python3.14/site-packages/Cython/Utility/Exceptions_Cy.pyx /usr/lib/python3.14/site-packages/Cython/__pycache__/LZSS.cpython-314.pyc /usr/lib/python3.14/site-packages/Cython/Utility/MatchCase_Cy.pyx /usr/lib/python3.14/site-packages/Cython/Utility/MatchCase.c /usr/lib/python3.14/site-packages/Cython/Compiler/StringEncoding.cpython-314-x86_64-linux-gnu.so /usr/lib/python3.14/site-packages/Cython/_sh ared.cpython-314-x86_64-linux-gnu.so /usr/lib/python3.14/site-packages/Cython/Includes/cpython/frozendict.pxd" packages/x86-64-v3-poky-linux/python3-cython/python3-cython: PKGV changed from 3.2.9 [default] to 3.3.0 [default] packages/x86-64-v3-poky-linux/python3-cython/python3-cython: PV changed from "3.2.9" to "3.3.0" Changes to packages/x86-64-v3-poky-linux/python3-cython (sysroot): /usr/lib/python3.14/site-packages/cython-3.2.9.dist-info moved to /usr/lib/python3.14/site-packages/cython-3.3.0.dist-info /usr/lib/python3.14/site-packages/Cython/Compiler/StringEncoding.cpython-314-x86_64-linux-gnu.so was added /usr/lib/python3.14/site-packages/Cython/Includes/cpython/frozendict.pxd was added /usr/lib/python3.14/site-packages/Cython/Includes/cpython/sentinel.pxd was added /usr/lib/python3.14/site-packages/Cython/LZSS.cpython-314-x86_64-linux-gnu.so was added /usr/lib/python3.14/site-packages/Cython/LZSS.py was added /usr/lib/python3.14/site-packages/Cython/__pycache__/LZSS.cpython-314.pyc was added /usr/lib/python3.14/site-packages/Cython/_shared.cpython-314-x86_64-linux-gnu.so was added /usr/lib/python3.14/site-packages/Cython/Utility/Exceptions_Cy.pyx was added /usr/lib/python3.14/site-packages/Cython/Utility/MatchCase.c was added /usr/lib/python3.14/site-packages/Cython/Utility/MatchCase_Cy.pyx was added /usr/lib/python3.14/site-packages/Cython/__init__.pyi was removed /usr/lib/python3.14/site-packages/Cython/Shadow.pyi was removed /usr/lib/python3.14/site-packages/Cython/Utility/Printing.c was removed
0001-python3-cython-upgrade-3.2.9-3.3.0.patch
Description: Binary data
Changelog for python3-cython: 3.2.9 -> 3.3.0
Source: CHANGES.rst
3.3.0 (2026-08-22)
==================
(Complete changelog for the 3.3.0 release, including pre-releases.)
Features added
--------------
* PEP-634 Pattern Matching is implemented.
(Github issue :issue:`4029`)
* ``except *`` (PEP-654 exception groups) is implemented for Python 3.11 and
later.
(Github issue :issue:`4993`)
* Unpacking in comprehensions (PEP-798) is implemented for list/set/dict
comprehensions.
It is not yet available for generator expressions.
Original patch by Morax. (Github issue :issue:`7898`)
* Changes were made to adapt to Python 3.15 and its Limited API.
This does not yet cover ``abi3t``.
(Github issues :issue:`6405`, :issue:`7190`, :issue:`7347`, :issue:`7348`,
:issue:`7358`)
* Cython now uses a new export/import naming scheme for fused C functions that
increases the resilience against seemingly compatible user code changes.
The original names are kept for backwards compatibility.
(Github issue :issue:`7656`)
* Declared container item types (e.g. ``list[float]`` or ``tuple[atype, ...]``)
are now used by the type system.
(Github issues :issue:`7288`, :issue:`7798`)
* Type inference was improved for builtin Python types and their methods.
(Github issues :issue:`7536`, :issue:`7644`, :issue:`7887`, :issue:`7888`)
* Exception base types are inferred for the target variable of multi-exception
``except``
clauses and for collections of exceptions. Properties like ``.args`` and
``.context``
use direct C access in CPython.
(Github issue :issue:`7783`)
* Annotations on global variables are now used by type inference.
(Github issue :issue:`7877`)
* The feature set of the shared module can be selected at build time
by listing named features to include or exclude.
This is an experimental configuration, subject to further improvements.
Failures to include used features will currently result in import failures.
(Github issue :issue:`7759`)
* To control the generation of the shared module, the ``cython`` command gained
a sub-command ``cython generate-shared pkg/modulename.c`` with additional
options
``--only`` and ``--exclude``.
Patch by Raza Khan. (Github issue :issue:`7842`)
* Conditions in strongly predictable if-clauses or if-else expressions can be
wrapped in
``cython.likely(condition)`` or ``cython.unlikely(condition)`` to help the C
compiler
optimise the branch. Note that Cython automatically detects ``raise`` and
``assert``
statements as terminators already and marks if-clauses that directly lead to
them as
``unlikely()``, without user interaction.
(Github issue :issue:`7667`)
* Extension types can declare themselves explicitly as sequence or mapping with
``@cython.collection_type("sequence")`` or
``@cython.collection_type("mapping")``.
This has an effect on their behaviour in pattern matching and subscripting.
(Github issue :issue:`5027`)
* Sequence types marked as ``@cython.collection_type("sequence")`` that use C
integers
in the subscript special methods now implement only the sequence and not the
mapping protocol.
This allows subscripting code to avoid creating Python index objects when the
index
is already available as C integer.
(Github issue :issue:`7435`)
* Sequence types that have their ``Py_TPFLAGS_SEQUENCE`` type flag set can
benefit from
faster subscripting via the sequence protocol as Cython now bypasses the
mapping protocol
for them if both protocols are implemented.
(Github issue :issue:`7432`)
* The Py3.15 ``frozendict`` builtin type is supported and has been backported
as an alias
for ``dict`` in older Python versions.
Patches to adapt existing ``dict`` optimisations were contributed by Omkar
Kabde.
(Github issues :issue:`7545`, :issue:`7647`)
* The Py3.15 ``sentinel`` builtin is supported and its C-API declarations are
available in
``cpython.sentinel``.
* ``cython.py_int`` (and the same for ``py_float``, ``py_complex`` and
``py_bool``)
can be used to refer to Python's builtin types in a C type context, e.g.
after ``cdef``,
where they are normally shadowed by the C types of the same name.
(Github issue :issue:`7844`)
* The builtin Python types ``int``, ``float``, ``str``, ``bytes`` and
``bytearray``
are special cased in comparisons to speed them up.
(Github issues :issue:`7452`, :issue:`7474`)
* The builtin Python types ``int`` and ``float`` are special cased in ``+``,
``-`` and ``*``
operations with (compile-time) unknown Python types in order to speed them up.
The bit operations ``^``, ``|`` and ``&`` are additionally special cased for
``int``.
(Github issues :issue:`7485`, :issue:`7541`)
* ``<bool>`` casts can be used to convert C values to Python ``True`` /
``False``.
(Github issue :issue:`7513`)
* ``cdef`` property methods support setters.
(Github issues :issue:`7505`, :issue:`7791`)
* The C ``restrict`` modifier can be used in declarations.
(Github issue :issue:`7617`)
* C arrays may now be declared with (``extern`` or internal) enum values as
their size.
(Github issues :issue:`7401`, :issue:`7406`)
* ``prange(num_threads=0)`` automatically selects the maximum number of OpenMP
threads.
(Github issue :issue:`7586`)
* ``prange()`` and ``parallel()`` sections can be used without releasing the
GIL, which
helps in freethreading builds. When releasing the GIL as part of the section
declaration,
re-acquiring it immediately inside is now faster, e.g. to do per-thread
Python initialisations.
(Github issue :issue:`6562`)
* ``cython.pymutex`` and ``cython.pythread_type_lock`` now support a
``.locked()`` method
to check if the lock is currently held without blocking. The method works on
all Python
versions using atomic reads on Python 3.13+ and a try-acquire approach on
older versions.
(Github issue :issue:`7275`)
* A simpler mechanism was added for implementing C++ exception handlers in
Cython code.
(Github issues :issue:`7388`, :issue:`7390`)
* Repeated memoryview slicing inside of loops now avoids redundant reference
counting,
making it substantially faster.
(Github issue :issue:`5507`)
* Indexing into Cython memoryview objects from Python is faster.
(Github issue :issue:`7529`)
* Some internal call overhead in the memoryview code was removed.
(Github issue :issue:`7609`)
* Extension types use the vectorcall interface for their instantiation in many
cases.
This can be configured with a new C feature macro ``CYTHON_VECTORCALL_TPNEW``.
(Github issue :issue:`7698`)
* Coroutine methods use the faster vectorcall interface.
(Github issue :issue:`7678`)
* Vectorcalls with literal keyword arguments use cached constant keyword name
tuples.
(Github issue :issue:`7713`)
* List comprehensions that generate new objects avoid refcounting overhead for
appending.
(Github issue :issue:`7748`)
* Method calls in older Limited API versions are slightly faster.
(Github issue :issue:`7707`)
* Constant ``frozenset`` objects are deduplicated and cached at module init time
(similar to constant tuple and slice objects).
Original Patch by Zhenbo Li. (Github issue :issue:`2741`)
* C arrays are substituted for sequence iteration in more cases, also inside of
generators.
Ad-hoc C array storage on the stack and in closures was reworked along the
way.
(Github issues :issue:`7323`, :issue:`7339`)
* Single character `in`-tests on ``str``, ``bytes`` and ``bytearray`` are
optimised.
(Github issue :issue:`3888`)
* Unicode string comparisons to single character literals are faster.
(Github issue :issue:`7418`)
* F-strings are a little faster in some cases.
(Github issues :issue:`7495`, :issue:`7526`)
* Formatting C floating point values in f-strings avoids creating Python floats
in some cases.
Patch by Vladimir Saraikin. (Github issue :issue:`7797`)
* ``bytearray.extend(bytes)`` is faster.
(Github issue :issue:`7797`)
* ``assert`` conditions are constant-folded.
(Github issue :issue:`7809`)
* PyPy and GraalPython use the vectorcall protocol to enable faster Python
calls in future releases.
(Github issue :issue:`7614`)
* The runtime conversion from a Python mapping to a C struct/union uses less
code.
(Github issue :issue:`7343`)
* The error handling of memoryviews uses less code.
(Github issue :issue:`7525`)
* The runtime dispatch code of fused types uses less code.
(Github issue :issue:`7501`)
* More code is extracted to the shared utility code module.
(Github issues :issue:`7556`, :issue:`7570`)
* Async generator objects are slightly smaller.
(Github issue :issue:`7776`)
* Cython compiled functions have a more efficient memory layout in the Limited
API.
(Github issue :issue:`7519`)
* Module string content is now compressed with LZSS by default, which reduces
the footprint of the
decompressor code compared to the 3.2.x default ``zlib``. This also avoids a
runtime dependency
on the ``zlib`` module since the tiny LZSS decompressor can be embedded in
the module.
(Github issue :issue:`7577`)
* The Py2 ``print`` statement is now implemented in Cython instead of C to make
it
thread-safe and uses a vectorcall into Python.
(Github issue :issue:`7642`)
* Several C++ exception declarations were added to ``libcpp.exceptions``.
(Github issue :issue:`7389`)
* Missing Python type flag declarations were added to ``cpython.object``.
(Github issue :issue:`7441`)
* Declarations for ``PyType_GetSlot()`` and the corresponding type slot IDs
were added
to ``cpython.type``.
* Declarations for specialised byte-conversion functions were added to
``cpython.long`` and ``cpython.float``.
Patch by Valentin Valls. (Github issue :issue:`7738`)
* Error detection when assigning to ``const`` variables was improved.
(Github issue :issue:`7359`)
* Some cases of likely misuse of ``critical_section`` now generate warnings.
(Github issue :issue:`6766`)
* Programmatic use of Cython has become easier by avoiding the need to manually
set up
the error reporting.
(Github issue :issue:`7235`)
* Autoscaling in ``cymeit`` is a little faster.
* ``TreeFragment.parse_from_strings()`` now supports full modules and ``.pxd``
files.
Patch by Itamar Turner-Trauring. (Github issue :issue:`7827`)
* Unicode 17.0.0 is used to parse identifiers.
Bugs fixed
----------
* Several issues with ``.close()`` or ``.throw()`` of Async generator
asend/athrow
objects were resolved, following fixes in CPython.
(Github issue :issue:`7777`)
* The ``__class__`` method cell misbehaved when used together with class
decorators
and passed the decorated class (and thus an arbitrary object) into ``super()``
instead of the class object.
(Github issue :issue:`7721`)
* A ``return value`` from within a ``prange()`` loop could silently return the
default value of the return type instead of the user provided value.
(Github issue :issue:`7587`)
* Assigning a Python 3.14+ ``.__annotate__`` function to a Cython compiled
function no
longer evaluates annotations eagerly.
(Github issue :issue:`7767`)
* Generated Cython language features like properties, auto-pickle or dataclasses
now use a critical section (on the object itself) as guard for concurrent
access.
(Github issue :issue:`6621`)
* The star-import implementation needlessly rejected several names in internal
use.
They are now allowed and become regular Python module attributes.
(Github issue :issue:`4931`)
* Mixing function signature declarations in Python modules and their ``.pxd``
modules could fail.
(Github issues :issue:`5970`, :issue:`4388`)
* C array declarations with type and size could fail with an exception in pure
Python code.
(Github issue :issue:`7372`)
* A ``const`` modifier in C++ template type arguments could be mapped
incorrectly.
(Github issue :issue:`6294`)
* C++ ``typeid()`` failed to compile on more complex expressions.
(Github issue :issue:`7069`)
* Optimised Python ``int`` and ``float`` operations did not remember their
result type,
leading to less optimised code in longer expressions.
(Github issues :issue:`7363`, :issue:`7502`)
* Slices as dictionary keys confused the type inference of item access.
(Github issue :issue:`7702`)
* A race condition when ``return``ing from a ``cython.parallel.parallel``
section was fixed.
(Github issue :issue:`6521`)
* Cython still used ``(type, exc, traceback)`` for saving and restoring
exception state,
even though modern CPython versions only store the exception object itself
internally.
This is now modernised in many places to reduce overhead.
(Github issue :issue:`7481`)
* Exceptions originating from the ``Py_UNICODE_IS*()`` character classification
macros and
the corresponding ``str.is*()`` methods, which they alias, were not handled
but ignored in
the Limited API.
(Github issue :issue:`7602`)
* In the Limited API, import time failures to create code objects for compiled
functions,
e.g. due to future Python API changes, are no longer fatal but generate a
warning.
(Github issue :issue:`5718`)
* Several internal cases where exceptions are caught and discarded now
propagate the
``BaseException`` errors and only discard the expected exceptions.
(Github issue :issue:`7600`)
* Error handling was improved when setting up the table of ``cdef`` methods for
extension types
and unexpected errors are propagated.
(Github issue :issue:`7613`)
* Exceptions while setting up the automatic pickle support are now propagated.
(Github issue :issue:`7613`)
* Exceptions thrown into async generators could leave the generator in an
unclosed state.
(Github issue :issue:`7618`)
* In the Limited API, failures while formatting type names in exceptions are
now uniformly handled.
(Github issue :issue:`7680`)
* A ``cpdef enum`` with negative values changed to non-negative in Python 3.15.
It now uses a dedicated enum implementation class to allow this.
(Github issue :issue:`7185`)
* ``cpdef fused`` functions generated redundant code.
(Github issue :issue:`7778`)
* Automatic C++ STL conversions in different compiler directive contexts could
generate
invalid code duplications in C++ code.
Original Patch by bjodah. (Github issue :issue:`6981`)
* The global module state struct now lives in an anonymous namespace in C++
mode to
allow linking multiple modules together in one shared library file.
(Github issue :issue:`7159`)
* Cached methods of builtin types were not GC-traversed and cleaned up as part
of the module state.
Patch by Maxwell Bernstein. (Github issue :issue:`7468`)
* Dict iteration generates safer code in PyPy/GraalPy/free-threading.
(Github issue :issue:`7637`)
* The floating point parsing code relied on C implementation specific "pointer
compare after free" behaviour.
Patch by stratakis. (Github issue :issue:`7463`)
* When non-heap types were used as base classes of extension heap types, the
heap types
were not correctly reference counted by their instances.
(Github issue :issue:`7483`)
* The ``.__signatures__`` dict of fused functions is no longer writable.
(Github issue :issue:`7386`)
* A minimal implementation of ``.__annotate__`` was added to Cython compiled
functions to make
``@functools.wraps`` work in Python 3.14+.
(Github issue :issue:`7675`)
* The ``--embed-positions`` option no longer includes absolute file paths in
the C code.
(Github issue :issue:`6755`)
* Casting to an unresolved ``typeof()`` type (e.g.
``cython.cast(cython.typeof(x), ...)``
where the type could not be inferred) crashed the compiler instead of
reporting an error.
Patch by Vladimir Saraikin. (Github issue :issue:`7683`)
* Error reporting on missing braces in f-strings was misleading.
(Github issue :issue:`7436`)
* Declaring a ``__dict__`` attribute in a class as ``public`` or ``readonly``
generated incorrect code. It is now detected as an error.
Patch by Anthony Donlon. (Github issue :issue:`7823`)
* ``None`` default values for function arguments declared as ``not None`` are
now rejected
at compile time rather than leading to errors at runtime.
Patch by Vyas Ramasubramani. (Github issue :issue:`7762`)
* Cython did not reject code with multiple contradicting type annotations on
the same variable.
(Github issue :issue:`7246`)
* Cython no longer warns if ``@profile`` or ``@linetrace`` is applied to a
function
without changing the global/outer setting. This avoids annoyance when users
leave
such redundant decorators in the code for occasional use.
* The virtualenv activation inside of ``cygdb`` when it is run from a
virtualenv works in more cases.
Original patch by Pierrick Koch and Ashutosh Varma. (Github issues
:issue:`1961`, :issue:`3629`)
* Modules with non-ASCII names could end up with UTF-8 characters in their C
code.
(Github issue :issue:`7588`)
* MSVC could silently truncate long C string literals (including internal ones)
at a 64k bytes border. This is now worked around using C char arrays.
(Github issue :issue:`7824`)
* Several C compiler warnings related to mixed signed/unsigned C integer usage
were resolved.
* Some compiler directives failed to apply to Cython's build, which lead to
unintentionally (slightly) increased wheel sizes.
(Github issue :issue:`7801`)
* A regression in 3.3.0b1 that generated invalid C code for exception type
checks was fixed.
(Github issue :issue:`7902`)
* Includes all fixes as of Cython 3.2.9.
Other changes
-------------
* Support for Python 3.8 has been removed.
As a side-effekt, support for StacklessPython and Pyston (last release was
3.8) was also removed.
Python 3.9 is planned to remain supported for several years due to its use in
LTS Linux distributions.
(Github issue :issue:`7271`)
* The vectorcall feature macros were unified to make ``CYTHON_VECTORCALL`` the
only way to
disable this feature (if need arises). Previously the option macros
``CYTHON_METH_FASTCALL``,
``CYTHON_FAST_PYCALL`` and ``CYTHON_VECTORCALL`` all controlled different
aspects of the
implementation.
(Github issue :issue:`7616`)
* Setting the Limited API version macro ``Py_LIMITED_API`` in PyPy or
GraalPython
now enables the Limited API usage in these runtimes. This will currently fail
due to lack of support in the runtimes, but is intended for initial testing
and future improvements.
(Github issue :issue:`7831`)
* Setting ``Py_LIMITED_API`` to a newer API version x.y than the current runtime
(and its header files) is now detected and will explicitly fail to compile,
rather than running into less obvious C compile or runtime issues.
(Github issue :issue:`7185`)
* Coroutines no longer provide the legacy ``_is_coroutine`` property.
(Github issue :issue:`7709`)
* Two more Cython modules are compiled in the binary wheels, which should
improve the
translation speed for modules with many strings.
(Github issue :issue:`7795`)
* The distributed Cython binary wheels now use a shared utility code module to
reduce their size.
(Github issue :issue:`7865`)
* ``Cython/Shadow.pyi`` has been merged into ``Cython/Shadow.py``.
(Github issue :issue:`7376`)
* The documentation now uses the "Clarity" Sphinx theme.
Patch by Libor Jelínek. (Github issue :issue:`7564`)
3.3.0b1 (2026-08-14)
====================
Features added
--------------
* Cython now uses a new export/import naming scheme for fused C functions that
increases the resilience against seemingly compatible user code changes.
The original names are kept for backwards compatibility.
(Github issue :issue:`7656`)
* ``except *`` (PEP-654 exception groups) is implemented for Python 3.11 and
later.
(Github issue :issue:`4993`)
* Unpacking in comprehensions (PEP-798) is implemented for list/set/dict
comprehensions.
It is not yet available for generator expressions.
Original patch by Morax. (Github issue :issue:`7898`)
* The feature set of the shared module can be selected at build time
by listing named features to include or exclude.
This is an experimental configuration, subject to further improvements.
Failures to include used features will currently result in import failures.
(Github issue :issue:`7759`)
* To control the generation of the shared module, the ``cython`` command gained
a sub-command ``cython generate-shared pkg/modulename.c`` with additional
options
``--only`` and ``--exclude``.
Patch by Raza Khan. (Github issue :issue:`7842`)
* Exception base types are inferred for the target variable of multi-exception
``except``
clauses and for collections of exceptions. Properties like ``.args`` and
``.context``
use direct C access in CPython.
(Github issue :issue:`7783`)
* Annotations on global variables are now used by type inference.
(Github issue :issue:`7877`)
* C property setters can now explicitly propagate exceptions, instead of always
triggering
a call to ``PyErr_Occurred()`` by returning ``void``.
(Github issue :issue:`7791`)
* Conditions in strongly predictable if-clauses or if-else expressions can be
wrapped in
``cython.likely(condition)`` or ``cython.unlikely(condition)`` to help the C
compiler
optimise the branch. Note that Cython automatically detects ``raise`` and
``assert``
statements as terminators already and marks if-clauses that directly lead to
them as
``unlikely()``, without user interaction.
(Github issue :issue:`7667`)
* The typed tuple syntax ``tuple[atype, ...]`` for homogeneous tuples is
supported.
(Github issue :issue:`7798`)
* The return type inference for calls to builtin methods was improved,
including dict views.
(Github issues :issue:`7887`, :issue:`7888`)
* ``cython.py_int`` (and the same for ``py_float``, ``py_complex`` and
``py_bool``)
can be used to refer to Python's builtin types in a C type context, e.g.
after ``cdef``,
where they are normally shadowed by the C types of the same name.
(Github issue :issue:`7844`)
* Constant ``frozenset`` objects are deduplicated and cached at module init time
(similar to constant tuple and slice objects).
Original Patch by Zhenbo Li. (Github issue :issue:`2741`)
* Formatting C floating point values in f-strings is faster.
Patch by Vladimir Saraikin. (Github issue :issue:`7797`)
* ``bytearray.extend(bytes)`` is faster.
(Github issue :issue:`7797`)
* Single character `in`-tests on ``str``, ``bytes`` and ``bytearray`` are
optimised.
(Github issue :issue:`3888`)
* ``assert`` conditions are constant-folded.
(Github issue :issue:`7809`)
* Async generator objects are slightly smaller.
(Github issue :issue:`7776`)
* Two more Cython modules are compiled in the binary wheels, which should
improve the
translation speed for modules with many strings.
(Github issue :issue:`7795`)
* ``TreeFragment.parse_from_strings()`` now supports full modules and ``.pxd``
files.
Patch by Itamar Turner-Trauring. (Github issue :issue:`7827`)
Bugs fixed
----------
* Several issues with ``.close()`` or ``.throw()`` of Async generator
asend/athrow
objects were resolved, following fixes in CPython.
(Github issue :issue:`7777`)
* The ``__class__`` method cell misbehaved when used together with class
decorators
and passed the decorated class (and thus an arbitrary object) into ``super()``
instead of the class object.
(Github issue :issue:`7721`)
* Declaring a ``__dict__`` attribute in a class as ``public`` or ``readonly``
generated incorrect code. It is now detected as an error.
Patch by Anthony Donlon. (Github issue :issue:`7823`)
* A ``return value`` from within a ``prange()`` loop could silently return the
default value of the return type instead of the user provided value.
(Github issue :issue:`7587`)
* Setting ``Py_LIMITED_API`` to a newer API version x.y than the current runtime
(and its header files) is now detected and will explicitly fail to compile,
rather than running into arbitrary C compile or runtime issues.
(Github issue :issue:`7185`)
* A ``cpdef enum`` with negative values changed to non-negative in Python 3.15.
It now uses a dedicated enum implementation class to allow this.
(Github issue :issue:`7185`)
* Casting to an unresolved ``typeof()`` type (e.g.
``cython.cast(cython.typeof(x), ...)``
where the type could not be inferred) crashed the compiler instead of
reporting an error.
Patch by Vladimir Saraikin. (Github issue :issue:`7683`)
* ``cpdef fused`` functions generated redundant code.
(Github issue :issue:`7778`)
* Automatic C++ STL conversions in different compiler directive contexts could
generate
invalid code duplications in C++ code.
Original Patch by bjodah. (Github issue :issue:`6981`)
* Subscripting frozendicts with integer keys could fail in 3.3.0a1.
* When calling builtin types to create an instance, type inference could
incorrectly
assume ``type`` as the type of the result rather the concrete builtin type in
3.3.0a1.
(Github issue :issue:`7848`)
* The return type of some builtin methods were not correctly inferred in
chained calls in 3.3.0a1.
(Github issue :issue:`7664`)
* Iterating over a container with an incorrectly declared item type could
generate
incorrect C code in 3.3.0a1.
(Github issues :issue:`7775`, :issue:`7889`)
* ``NULL`` pointer comparisons could fail to compile with C++ in 3.3.0a1.
Patch by Vyas Ramasubramani. (Github issue :issue:`7766`)
* A C helper function for mapping function arguments could be missing in
3.3.0a1.
(Github issue :issue:`7785`)
* MSVC could silently truncate long C string literals (including internal ones)
at a 64k bytes border. This is now worked around using C char arrays.
(Github issue :issue:`7824`)
* The virtualenv activation inside of ``cygdb`` when it is run from a
virtualenv works in more cases.
Original patch by Pierrick Koch and Ashutosh Varma. (Github issues
:issue:`1961`, :issue:`3629`)
* Some compiler directives failed to apply to Cython's build, which lead to
unintentionally (slightly) increased wheel sizes.
(Github issue :issue:`7801`)
* Includes all fixes as of Cython 3.2.9.
Other changes
-------------
* Setting the Limited API version macro ``Py_LIMITED_API`` in PyPy or
GraalPython
now enables the Limited API usage in these runtimes. This will currently fail
due to lack of support in the runtimes, but is intended for initial testing
and future improvements.
(Github issue :issue:`7831`)
* Cython wheels now use a shared utility code module to reduce their size.
(Github issue :issue:`7865`)
3.3.0a1 (2026-06-24)
====================
Features added
--------------
* Changes were made to adapt to Python 3.15 and its Limited API.
(Github issues :issue:`6405`, :issue:`7190`, :issue:`7347`, :issue:`7348`,
:issue:`7358`)
* PEP-634 Pattern Matching is implemented.
(Github issue :issue:`4029`)
* Declared container item types (e.g. ``list[float]``) are now used by the type
system.
(Github issue :issue:`7288`)
* Type inference was improved for builtin Python types.
(Github issues :issue:`7536`, :issue:`7644`)
* Extension types can declare themselves explicitly as sequence or mapping with
``@cython.collection_type("sequence")`` or
``@cython.collection_type("mapping")``.
This has an effect on their behaviour in pattern matching and subscripting.
(Github issue :issue:`5027`)
* Sequence types that have their ``Py_TPFLAGS_SEQUENCE`` type flag set can
benefit from
faster subscripting via the sequence protocol as Cython now bypasses the
mapping protocol
for them if both protocols are implemented.
(Github issue :issue:`7432`)
* Sequence types marked as ``@cython.collection_type("sequence")`` that use C
integers
in the subscript special methods now implement only the sequence and not the
mapping protocol.
This allows subscripting code to avoid creating Python index objects when the
index
is already available as C integer.
(Github issue :issue:`7435`)
* The Py3.15 ``frozendict`` builtin type is supported and has been backported
as an alias
for ``dict`` in older Python versions.
Patches to adapt existing ``dict`` optimisations were contributed by Omkar
Kabde.
(Github issues :issue:`7545`, :issue:`7647`)
* The Py3.15 ``sentinel`` builtin is supported and its C-API declarations are
available in
``cpython.sentinel``.
* The builtin Python types ``int``, ``float``, ``str``, ``bytes`` and
``bytearray``
are special cased in comparisons to speed them up.
(Github issues :issue:`7452`, :issue:`7474`)
* The builtin Python types ``int`` and ``float`` are special cased in ``+``,
``-`` and ``*``
operations with (compile-time) unknown Python types in order to speed them up.
The bit operations ``^``, ``|`` and ``&`` are additionally special cased for
``int``.
(Github issues :issue:`7485`, :issue:`7541`)
* ``<bool>`` casts can be used to convert C values to Python ``True`` /
``False``.
(Github issue :issue:`7513`)
* ``cdef`` property methods support setters.
(Github issue :issue:`7505`)
* The C ``restrict`` modifier can be used in declarations.
(Github issue :issue:`7617`)
* C arrays may now be declared with (``extern`` or internal) enum values as
their size.
(Github issues :issue:`7401`, :issue:`7406`)
* ``prange(num_threads=0)`` automatically selects the maximum number of OpenMP
threads.
(Github issue :issue:`7586`)
* ``prange()`` and ``parallel()`` sections can be used without releasing the
GIL, which
helps in freethreading builds. When releasing the GIL as part of the section
declaration,
re-acquiring it immediately inside is now faster, e.g. to do per-thread
Python initialisations.
(Github issue :issue:`6562`)
* ``cython.pymutex`` and ``cython.pythread_type_lock`` now support a
``.locked()`` method
to check if the lock is currently held without blocking. The method works on
all Python
versions using atomic reads on Python 3.13+ and a try-acquire approach on
older versions.
(Github issue :issue:`7275`)
* A simpler mechanism was added for implementing C++ exception handlers in
Cython code.
(Github issues :issue:`7388`, :issue:`7390`)
* Repeated memoryview slicing inside of loops now avoids redundant reference
counting,
making it substantially faster.
(Github issue :issue:`5507`)
* Indexing into Cython memoryview objects from Python is faster.
(Github issue :issue:`7529`)
* Some internal call overhead in the memoryview code was removed.
(Github issue :issue:`7609`)
* Extension types use the vectorcall interface for their instantiation in many
cases.
This can be configured with a new C feature macro ``CYTHON_VECTORCALL_TPNEW``.
(Github issue :issue:`7698`)
* Coroutine methods use the faster vectorcall interface.
(Github issue :issue:`7678`)
* Vectorcalls with literal keyword arguments use cached constant keyword name
tuples.
(Github issue :issue:`7713`)
* List comprehensions that generate new objects avoid refcounting overhead for
appending.
(Github issue :issue:`7748`)
* Method calls in older Limited API versions are slightly faster.
(Github issue :issue:`7707`)
* C arrays are substituted for sequence iteration in more cases, also inside of
generators.
Ad-hoc C array storage on the stack and in closures was reworked along the
way.
(Github issues :issue:`7323`, :issue:`7339`)
* Unicode string comparisons to single character literals are faster.
(Github issue :issue:`7418`)
* F-strings are a little faster in some cases.
(Github issues :issue:`7495`, :issue:`7526`)
* PyPy and GraalPython use the vectorcall protocol to enable faster Python
calls in future releases.
(Github issue :issue:`7614`)
* The runtime conversion from a Python mapping to a C struct/union uses less
code.
(Github issue :issue:`7343`)
* The error handling of memoryviews uses less code.
(Github issue :issue:`7525`)
* The runtime dispatch code of fused types uses less code.
(Github issue :issue:`7501`)
* More code is extracted to the shared utility code module.
(Github issues :issue:`7556`, :issue:`7570`)
* Cython compiled functions have a more efficient memory layout in the Limited
API.
(Github issue :issue:`7519`)
* Module string content is now compressed with LZSS by default, which reduces
the footprint of the
decompressor code compared to the 3.2.x default ``zlib``. This also avoids a
runtime dependency
on the ``zlib`` module since the tiny LZSS decompressor can be embedded in
the module.
(Github issue :issue:`7577`)
* The Py2 ``print`` statement is now implemented in Cython instead of C to make
it
thread-safe and uses a vectorcall into Python.
(Github issue :issue:`7642`)
* Several C++ exception declarations were added to ``libcpp.exceptions``.
(Github issue :issue:`7389`)
* Missing Python type flag declarations were added to ``cpython.object``.
(Github issue :issue:`7441`)
* Declarations for ``PyType_GetSlot()`` and the corresponding type slot IDs
were added
to ``cpython.type``.
* Declarations for specialised byte-conversion functions were added to
``cpython.long`` and ``cpython.float``.
Patch by Valentin Valls. (Github issue :issue:`7738`)
* Error detection when assigning to ``const`` variables was improved.
(Github issue :issue:`7359`)
* Some cases of likely misuse of ``critical_section`` now generate warnings.
(Github issue :issue:`6766`)
* Programmatic use of Cython has become easier by avoiding the need to manually
set up
the error reporting.
(Github issue :issue:`7235`)
* Autoscaling in ``cymeit`` is a little faster.
* Unicode 17.0.0 is used to parse identifiers.
Bugs fixed
----------
* Assigning a Python 3.14+ ``.__annotate__`` function to a Cython compiled
function no
longer evaluates annotations eagerly.
(Github issue :issue:`7767`)
* Generated Cython language features like properties, auto-pickle or dataclasses
now use a critical section (on the object itself) as guard for concurrent
access.
(Github issue :issue:`6621`)
* The star-import implementation needlessly rejected several names in internal
use.
They are now allowed and become regular Python module attributes.
(Github issue :issue:`4931`)
* Mixing function signature declarations in Python modules and their ``.pxd``
modules could fail.
(Github issues :issue:`5970`, :issue:`4388`)
* C array declarations with type and size could fail with an exception in pure
Python code.
(Github issue :issue:`7372`)
* A ``const`` modifier in C++ template type arguments could be mapped
incorrectly.
(Github issue :issue:`6294`)
* C++ ``typeid()`` failed to compile on more complex expressions.
(Github issue :issue:`7069`)
* Optimised Python ``int`` and ``float`` operations did not remember their
result type,
leading to less optimised code in longer expressions.
(Github issues :issue:`7363`, :issue:`7502`)
* Slices as dictionary keys confused the type inference of item access.
(Github issue :issue:`7702`)
* A race condition when ``return``ing from a ``cython.parallel.parallel``
section was fixed.
(Github issue :issue:`6521`)
* Cython still used ``(type, exc, traceback)`` for saving and restoring
exception state,
even though modern CPython versions only store the exception object itself
internally.
This is now modernised in many places to reduce overhead.
(Github issue :issue:`7481`)
* Exceptions originating from the ``Py_UNICODE_IS*()`` character classification
macros and
the corresponding ``str.is*()`` methods, which they alias, were not handled
but ignored in
the Limited API.
(Github issue :issue:`7602`)
* In the Limited API, import time failures to create code objects for compiled
functions,
e.g. due to future Python API changes, are no longer fatal but generate a
warning.
(Github issue :issue:`5718`)
* Several internal cases where exceptions are caught and discarded now
propagate the
``BaseException`` errors and only discard the expected exceptions.
(Github issue :issue:`7600`)
* Error handling was improved when setting up the table of ``cdef`` methods for
extension types
and unexpected errors are propagated.
(Github issue :issue:`7613`)
* Exceptions while setting up the automatic pickle support are now propagated.
(Github issue :issue:`7613`)
* Exceptions thrown into async generators could leave the generator in an
unclosed state.
(Github issue :issue:`7618`)
* In the Limited API, failures while formatting type names in exceptions are
now uniformly handled.
(Github issue :issue:`7680`)
* The global module state struct now lives in an anonymous namespace in C++
mode to
allow linking multiple modules together in one shared library file.
(Github issue :issue:`7159`)
* Dict iteration generates safer code in PyPy/GraalPy/free-threading.
(Github issue :issue:`7637`)
* The floating point parsing code relied on C implementation specific "pointer
compare after free" behaviour.
Patch by stratakis. (Github issue :issue:`7463`)
* When non-heap types were used as base classes of extension heap types, the
heap types
were not correctly reference counted by their instances.
(Github issue :issue:`7483`)
* The ``.__signatures__`` dict of fused functions is no longer writable.
(Github issue :issue:`7386`)
* A minimal implementation of ``.__annotate__`` was added to Cython compiled
functions to make
``@functools.wraps`` work in Python 3.14+.
(Github issue :issue:`7675`)
* The ``--embed-positions`` option no longer includes absolute file paths in
the C code.
(Github issue :issue:`6755`)
* Error reporting on missing braces in f-strings was misleading.
(Github issue :issue:`7436`)
* ``None`` default values for function arguments declared as ``not None`` are
now rejected at compile time
rather than leading to errors at runtime.
Patch by Vyas Ramasubramani. (Github issue :issue:`7762`)
* Cython did not reject code with multiple contradicting type annotations on
the same variable.
(Github issue :issue:`7246`)
* Cython no longer warns if ``@profile`` or ``@linetrace`` is applied to a
function
without changing the global/outer setting. This avoids annoyance when users
leave
such redundant decorators in the code for occasional use.
* Cached methods of builtin types were not GC-traversed and cleaned up as part
of the module state.
Patch by Maxwell Bernstein. (Github issue :issue:`7468`)
* Modules with non-ASCII names could end up with UTF-8 characters in their C
code.
(Github issue :issue:`7588`)
* Several C compiler warnings related to mixed signed/unsigned C integer usage
were resolved.
* Includes all fixes as of Cython 3.2.6.
Other changes
-------------
* Support for Python 3.8 has been removed.
As a side-effekt, support for StacklessPython and Pyston (last release was
3.8) was also removed.
Python 3.9 is planned to remain supported for several years due to its use in
LTS Linux distributions.
(Github issue :issue:`7271`)
* The vectorcall feature macros were unified to make ``CYTHON_VECTORCALL`` the
only way to
disable this feature (if need arises). Previously the option macros
``CYTHON_METH_FASTCALL``,
``CYTHON_FAST_PYCALL`` and ``CYTHON_VECTORCALL`` all controlled different
aspects of the
implementation.
(Github issue :issue:`7616`)
* Coroutines no longer provide the legacy ``_is_coroutine`` property.
(Github issue :issue:`7709`)
* ``Cython/Shadow.pyi`` has been merged into ``Cython/Shadow.py``.
(Github issue :issue:`7376`)
* The documentation now uses the "Clarity" Sphinx theme.
Patch by Libor Jelínek. (Github issue :issue:`7564`)
3.2.10 (2026-0?-??)
==================
Bugs fixed
----------
* Unpickling wrappers of compiled functions failed.
(Github issue :issue:`7846`)
* A compiler crash was fixed when using comprehension results directly in
in-place assignments.
Patch by AbhinavMir. (Github issue :issue:`7846`)
* A compiler crash was fixed when keyword arguments were used in C++ class
calls.
Patch by Vladimir Saraikin. (Github issue :issue:`7206`)
3.2.9 (2026-07-24)
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