Releases: cython/cython
3.1.0a1
3.1.0 alpha 1 (2024-11-08)
Features added
-
Support for freethreading builds of CPython 3.13 was added.
It comes with a new directivefreethreading_compatible=Trueto mark modules as
free-threading compatible (Py_mod_gil).
https://github.com/cython/cython/issues?q=label%3A"nogil+CPython"
Patches by Lysandros Nikolaou and Nathan Goldbaum. (Github issue :issue:6162) -
Support for monitoring Cython modules via
sys.monitoringin CPython 3.13+ was added.
For coverage reporting, this needs to be disabled with-DCYTHON_USE_SYS_MONITORING=0
as long ascoverage.pydoes not supportsys.monitoringfor coverage plugins.
(Github issue :issue:6144) -
Many issues with the Limited C-API were resolved.
It is now sufficient to define the macroPy_LIMITED_APIto activate the support.
https://github.com/cython/cython/issues?q=label%3A%22limited+api%22 -
Support for GraalPython was improved (but is still incomplete).
-
Several issues with the gdb support were resolved.
Patches by Kent Slaney. (Github issues :issue:5955, :issue:5948) -
typing.Union[SomeType, None]andSomeType | Noneare now understood and mean
the same astyping.Optional[SomeType], allowingNonein type checks.
(Github issue :issue:6254) -
cython.const[]andcython.volatile[]are now available as type modifiers in Python code.
(Github issue :issue:5728) -
cython.pointer[SomeCType]can now be used to define pointer types in Python type annotations.
(Github issue :issue:5071) -
Several improvements were made to reduce the size of the resulting extension modules.
(Github issue :issue:4425) -
Function calls now use the PEP-590 Vectorcall protocol, even when passing keyword arguments.
(Github issues :issue:5804) -
Coroutines now use the
am_sendslot function instead of going through a Python.send()call.
This has been backported for Python 3.7 - 3.9.
(Github issues :issue:4585) -
__set_name__is called when assigning to class attributes.
(Github issue :issue:6179) -
Most builtin methods now provide their return type for type inference.
(Github issues :issue:4829, :issue:5865, :issue:6412) -
Method calls on builtin literal values are evaluated at compile time, if applicable.
(Github issue :issue:6383) -
The Python
inttype now maps directly toPyLongand is inferred accordingly.
(Github issue :issue:4237) -
Integer operations on known
inttypes are faster.
(Github issue :issue:5785) -
f-strings are faster in some cases.
(Github issues :issue:5866, :issue:6342, :issue:6383) -
divmod()is faster on C integers.
Patch by Tong He. (Github issue :issue:6073) -
dict.pop()is faster in some cases.
(Github issue :issue:5911) -
.isprintable()is optimised for Unicode characters.
(Github issue :issue:3277) -
x in ()and similar tests against empty constant sequences (e.g. in generated code)
are now discarded if they have no side-effects.
(Github issue :issue:6288) -
Constant (non-GC) Python objects are no longer traversed with
Py_VISIT()during GC runs.
(Github issue :issue:6277) -
C++ classes implemented in Cython can now use method overloading.
Patch by samaingw. (Github issue :issue:3235) -
Assigning a Python container to a C++ vector now makes use of
__length_hint__
to avoid reallocations.
Patch by Denis Lukianov. (Github issue :issue:6077) -
The C++11
emplace*methods were added tolibcpp.deque.
Patch by Somin An. (Github issue :issue:6159) -
cpython.timewas updated and extended for Python 3.13.
(Github issue :issue:6187) -
Dataclasses support the
match_argsoption.
(Github issue :issue:5381) -
Threading in parallel sections can now be disabled with a new
use_threads_ifcondition.
(Github issue :issue:5919) -
New options
warn.deprecated.DEFandwarn.deprecated.IFcan silence the deprecation warnings.
Patch by Eric Larson. (Github issue :issue:6243) -
cygdbshows more helpful output for some objects.
Patch by Kent Slaney. (Github issue :issue:5958) -
Bazel build support for improved.
Patch by mering. (Github issue :issue:6452) -
The parser was updated for Unicode 15.1 (as provided by CPython 3.13b4).
Bugs fixed
-
C functions used different start lines and columns for error reporting and tracing
than Python functions. They now use the line and column of their first decorator
or (if none) their definition line, as in Python.
(Github issue :issue:6366) -
Dataclasses did not handle default fields without init value correctly.
(Github issue :issue:5858) -
Implementing a special method based on another could lead to infinite recursion.
(Github issue :issue:5863) -
The
__class__cell variable in methods was not always working as in Python.
Initial patch by Tom Keefe. (Github issue :issue:2912) -
Lambda functions had no code objects. Their signature can now be introspected.
(Github issue :issue:2983) -
Subtyping
complexas extension type could fail.
(Github issue :issue:6346) -
hasattr()now propagates exceptions that occur during lookup.
(Github issue :issue:6269) -
The base type of extension heap types is now traversed during GC runs in Py3.9+.
(Github issue :issue:4193) -
The Python
&operator could touch invalid memory with certain0values in Python <= 3.10.
Patch by Michael J. Sullivan. (Github issue :issue:4193) -
Exception values were not always recognised as equal at compile time.
(Github issue :issue:5709) -
Running Cython in different Python versions could generate slightly different C code
due to differences in the builtins.
(Github issue :issue:5591) -
The
common_include_dirfeature used different file paths in the C code on Windows and Posix.
It now uses forward slashes as directory separator consistently.
(Github issue :issue:6355) -
File paths in the C code are now relative to the build directory.
Patch by Oscar Benjamin. (Github issue :issue:6341) -
depfiles now use relative paths whenever possible.
Patch by Loïc Estève. (Github issue :issue:6345) -
The
-aoption in the IPython magic no longer copies the complete HTML document
into the notebook but only a more reasonable content snippet.
Patch by Min RK. (Github issue :issue:5760) -
Uselessly referring to C enums (not enum values) as Python objects is now rejected.
Patch by Vyas Ramasubramani. (Github issue :issue:5638) -
Cython no longer acquires the GIL during in-place assignments to C attributes in nogil sections.
Patch by Mads Ynddal. (Github issue :issue:6407) -
Several C++ warnings about
char*casts were resolved.
(Github issues :issue:5515, :issue:5847) -
C++ undefined behaviour was fixed in an error handling case.
(Github issue :issue:5278) -
Dict assignments to struct members with reserved C/C++ names could generate invalid C code.
-
The PEP-479 implementation could raise a visible
RuntimeErrorwithout
a trace of the originalStopIteration.
(Github issue :issue:5953) -
A crash was fixed when assigning a zero-length slice to a memoryview.
Patch by Michael Man. (Github issue :issue:6227) -
Conditionally assigning to variables with the walrus operator could crash.
(Github issue :issue:6094) -
Unterminated string literals could lock up the build in an infinite loop.
(Github issue :issue:5977) -
Exporting C functions uses better platform compatible code.
(Github issue :issue:4683) -
The shebang in
libpython.pywas incorrect.
Patch by Luke Hamburg. (Github issue :issue:6439) -
Cython now uses
SHA-256instead ofSHA-1for caching etc. as the latter may not be
available on all Python installations.
(Github issue :issue:6354)
Other changes
-
Support for Python 2.7 - 3.7 was removed, along with large chunks of legacy code.
(Github issue :issue:2800) -
The pxd files
cpython.int,cpython.cobject,cpython.oldbufferandcpython.string
were removed as they refer to C-API declarations that are only in Python 2.x.
(Github issue :issue:5870) -
The generated C code now requires a C99 compatible C compiler.
-
language_level=3is now the default.
language_level=3strhas become a legacy alias.
(Github issue :issue:5827) -
The Py2 types
unicodeandbasestringare now deprecated and have become aliases
of thestrtype.
(Github issue :issue:6374) -
Docstrings now strip their leading whitespace according to PEP-257.
Patch by Lawrence Mitchell. (Github issue :issue:6241) -
Type checkers should have it easier to find and validate Cython types in .py files.
(Github issue :issue:4327) -
The previously shipped NumPy C-API declarations (
cimport numpy) were removed.
NumPy has been providing version specific declarations for several versions now.
(Github issue :issue:5842) -
Usages of the outdated
WITH_THREADmacro guard were removed.
(Github issue :issue:5812) -
The options for showing the C code line in Python exception stack traces were cleaned up.
Previously, disabling the option with theCYTHON_CLINE_IN_TRACEBACKmacro did not
reduce the code overhead of the feature, and thec_line_in_tracebackcompile option
was partly redundant with the C macro switches and lead to warnings about unused code.
Since this is considered mostly a debug feature, the new default is that it is disabled
to avoid code and runtime overhead. It can be enabled by setting the C macro to 1, and
a new macro ``CYTHON_CLINE_IN_TRACEBACK...
3.0.11-1
3.0.11 (2024-08-05) =================== Features added -------------- * The C++11 ``emplace*`` methods were added to ``libcpp.deque``. Patch by Somin An. (Github issue :issue:`6159`) Bugs fixed ---------- * The exception check value of functions declared in pxd files was not always applied in 3.0.10. (Github issue :issue:`6122`) * A crash on exception deallocations was fixed. (Github issue :issue:`6022`) * A crash was fixed when assigning a zero-length slice to a memoryview. Patch by Michael Man. (Github issue :issue:`6227`) * ``libcpp.optional.value()`` could crash if it raised a C++ exception. Patch by Alexander Condello. (Github issue :issue:`6190`) * The return type of ``str()`` was mishandled, leading to crashes with ``language_level=3``. (Github issue :issue:`6166`) * ``bytes.startswith/endswith()`` failed for non-bytes substrings (e.g. ``bytearray``). (Github issue :issue:`6168`) * Fused ctuples crashed Cython. (Github issue :issue:`6068`) * A compiler crash was fixed when using extension types in fused types. (Github issue :issue:`6204`) * The module cleanup code was incorrect for globally defined memory view slices. (Github issue :issue:`6276`) * Some adaptations were made to enable compilation in Python 3.13. (Github issues :issue:`5997`, :issue:`6182`, :issue:`6251`)
3.0.10
3.0.10 (2024-03-30) =================== Bugs fixed ---------- * Cython generated incorrect self-casts when directly calling final methods of subtypes. Patch by Lisandro Dalcin. (Github issue :issue:`2747`) * Internal C names generated from C function signatures could become too long for MSVC. (Github issue :issue:`6052`) * The ``noexcept`` warnings could be misleading in some cases. Patch by Gonzalo Tornaría. (Github issue :issue:`6087`) * The ``@cython.ufunc`` implementation could generate incomplete C code. (Github issue :issue:`6064`) * The ``libcpp.complex`` declarations could result in incorrect C++ code. Patch by Raffi Enficiaud. (Github issue :issue:`6037`) * Several tests were adapted to work with both NumPy 1.x and 2.0. Patch by Matti Picus. (Github issues :issue:`6076`, :issue:`6100`) * C compiler warnings when the freelist implementation is disabled (e.g. on PyPy) were fixed. It can now be disabled explicitly with the C macro guard ``CYTHON_USE_FREELISTS=0``. (Github issue :issue:`6099`) * Some C macro guards for feature flags were missing from the NOGIL Python configuration. * Some recently added builtins were unconditionally looked up at module import time (if used by user code) that weren't available on all Python versions and could thus fail the import. * A performance hint regarding exported pxd declarations was improved. (Github issue :issue:`6001`)