Changelog
### 0.29.35
```
====================
Bugs fixed
----------
* A garbage collection enabled subtype of a non-GC extension type could call into the
deallocation function of the super type with GC tracking enabled. This could lead
to crashes during deallocation if GC was triggered on the type at the same time.
(Github issue :issue:`5432`)
* Some C compile failures and crashes in CPython 3.12 were resolved.
* ``except + nogil`` was syntactically not allowed.
``except +nogil`` (i.e. defining a C++ exception handling function called ``nogil``)
is now disallowed to prevent typos.
(Github issue :issue:`5430`)
* A C compile failure in PyPy 3.10 was resolved.
Patch by Matti Picus. (Github issue :issue:`5408`)
* Cython modules now use PEP-489 multi-phase init by default in PyPy 3.9 and later.
Original patch by Matti Picus. (Github issue :issue:`5413`)
* API header files generated by different Cython versions can now be included in the
same C file.
(Github issue :issue:`5383`)
* Function signatures containing a type like `tuple[()]` could not be printed.
Patch by Lisandro Dalcin. (Github issue :issue:`5355`)
```
### 0.29.34
```
====================
Bugs fixed
----------
* A refence leak of the for-loop list/tuple iterable was resolved if the for-loop's
``else:`` branch executes a ``break`` for an outer loop.
(Github issue :issue:`5347`)
* Some C compile failures in CPython 3.12 were resolved.
* Some old usages of the deprecated Python ``imp`` module were replaced with ``importlib``.
Patch by Matúš Valo. (Github issue :issue:`5300`)
* Some issues with ``depfile`` generation were resolved.
Patches by Eli Schwartz. (Github issues :issue:`5279`, :issue:`5291`)
```
### 0.29.33
```
====================
Features added
--------------
* The ``cythonize`` and ``cython`` commands have a new option ``-M`` / ``--depfile``
to generate ``.dep`` dependency files for the compilation unit. This can be used
by external build tools to track these dependencies.
The ``cythonize`` option was already available in Cython :ref:`0.29.27`.
Patches by Evgeni Burovski and Eli Schwartz. (Github issue :issue:`1214`)
Bugs fixed
----------
* ``const`` fused types could not be used with memory views.
Patch by Thomas Vincent. (Github issue :issue:`1772`)
* ``wstr`` usage was removed in Python 3.12 and later (PEP-623).
(Github issue :issue:`5145`)
* A type check assertion for Cython functions failed in debug Python builds.
(Github issue :issue:`5031`)
* Fixed various compiler warnings.
Patches by Lisandro Dalcin et al. (Github issues :issue:`4948`, :issue:`5086`)
* Fixed error when calculating complex powers of negative numbers.
(Github issue :issue:`5014`)
* Corrected a small mis-formatting of exception messages on Python 2.
(Github issue :issue:`5018`)
* The ``PyUnicode_AsUTF8AndSize()`` C-API function was missing from the CPython declarations.
(Github issue :issue:`5163`)
* A performance problem in the compiler was resolved when nesting conditional expressions.
(Github issue :issue:`5197`)
* Test suite problems with recent NumPy and CPython versions were resolved.
(Github issues :issue:`5183`, :issue:`5190`)
Other changes
-------------
* The undocumented, untested and apparently useless syntax
``from somemodule cimport class/struct/union somename`` was deprecated
in anticipation of its removal in Cython 3. The type
modifier is not needed here and a plain ``cimport`` of the name will do.
(Github issue :issue:`4905`)
* Properly disable generation of descriptor docstrings on PyPy since they cause crashes.
It was previously disabled, but only accidentally via a typo.
Patch by Matti Picus. (Github issue :issue:`5083`)
* The ``cpow`` directive of Cython 3.0 is available as a no-op.
(Github issue :issue:`5016`)
```
### 0.29.32
```
====================
Bugs fixed
----------
* Revert "Using memoryview typed arguments in inner functions is now rejected as unsupported."
Patch by David Woods. (Github issue :issue:`4798`)
* ``from module import *`` failed in 0.29.31 when using memoryviews.
Patch by David Woods. (Github issue :issue:`4927`)
```
### 0.29.31
```
====================
Features added
--------------
* A new argument ``--module-name`` was added to the ``cython`` command to
provide the (one) exact target module name from the command line.
Patch by Matthew Brett and h-vetinari. (Github issue :issue:`4906`)
* A new keyword ``noexcept`` was added for forward compatibility with Cython 3.
Patch by David Woods. (Github issue :issue:`4903`)
Bugs fixed
----------
* Use ``importlib.util.find_spec()`` instead of the deprecated ``importlib.find_loader()``
function when setting up the package path at import-time.
Patch by Matti Picus. (Github issue :issue:`4764`)
* Require the C compiler to support the two-arg form of ``va_start``
on Python 3.10 and higher.
Patch by Thomas Caswell. (Github issue :issue:`4820`)
* Make ``fused_type`` subscriptable in Shadow.py.
Patch by Pfebrer. (Github issue :issue:`4842`)
* Fix the incorrect code generation of the target type in ``bytearray`` loops.
Patch by Kenrick Everett. (Github issue :issue:`4108`)
* Atomic refcounts for memoryviews were not used on some GCC versions by accident.
Patch by Sam Gross. (Github issue :issue:`4915`)
* Silence some GCC ``-Wconversion`` warnings in C utility code.
Patch by Lisandro Dalcin. (Github issue :issue:`4854`)
* Tuple multiplication was ignored in expressions such as ``[*(1,) * 2]``.
Patch by David Woods. (Github issue :issue:`4864`)
* Calling ``append`` methods on extension types could fail to find the method
in some cases.
Patch by David Woods. (Github issue :issue:`4828`)
* Ensure that object buffers (e.g. ``ndarray[object, ndim=1]``) containing
``NULL`` pointers are safe to use, returning ``None`` instead of the ``NULL``
pointer.
Patch by Sebastian Berg. (Github issue :issue:`4859`)
* Using memoryview typed arguments in inner functions is now rejected as unsupported.
Patch by David Woods. (Github issue :issue:`4798`)
* Compilation could fail on systems (e.g. FIPS) that block MD5 checksums at runtime.
(Github issue :issue:`4909`)
* Experimental adaptations for the CPython "nogil" fork was added.
Note that there is no official support for this in Cython 0.x.
Patch by Sam Gross. (Github issue :issue:`4912`)
```
### 0.29.30
```
====================
Bugs fixed
----------
* The GIL handling changes in 0.29.29 introduced a regression where
objects could be deallocated without holding the GIL.
(Github issue :issue:`4796`)
```
### 0.29.29
```
====================
Features added
--------------
* Avoid acquiring the GIL at the end of nogil functions.
This change was backported in order to avoid generating wrong C code
that would trigger C compiler warnings with tracing support enabled.
Backport by Oleksandr Pavlyk. (Github issue :issue:`4637`)
Bugs fixed
----------
* Function definitions in ``finally:`` clauses were not correctly generated.
Patch by David Woods. (Github issue :issue:`4651`)
* A case where C-API functions could be called with a live exception set was fixed.
Patch by Jakub Kulík. (Github issue :issue:`4722`)
* Pickles can now be exchanged again with those generated from Cython 3.0 modules.
(Github issue :issue:`4680`)
* Cython now correctly generates Python methods for both the provided regular and
reversed special numeric methods of extension types.
Patch by David Woods. (Github issue :issue:`4750`)
* Calling unbound extension type methods without arguments could raise an
``IndexError`` instead of a ``TypeError``.
Patch by David Woods. (Github issue :issue:`4779`)
* Calling unbound ``.__contains__()`` super class methods on some builtin base
types could trigger an infinite recursion.
Patch by David Woods. (Github issue :issue:`4785`)
* The C union type in pure Python mode mishandled some field names.
Patch by Jordan Brière. (Github issue :issue:`4727`)
* Allow users to overwrite the C macro ``_USE_MATH_DEFINES``.
Patch by Yuriy Chernyshov. (Github issue :issue:`4690`)
* Improved compatibility with CPython 3.10/11.
Patches by Thomas Caswell, David Woods.
(Github issues :issue:`4609`, :issue:`4667`, :issue:`4721`, :issue:`4730`, :issue:`4777`)
* Docstrings of descriptors are now provided in PyPy 7.3.9.
Patch by Matti Picus. (Github issue :issue:`4701`)
```
### 0.29.28
```
====================
Bugs fixed
----------
* Due to backwards incompatible changes in CPython 3.11a4, the feature flags
``CYTHON_FAST_THREAD_STATE`` and ``CYTHON_USE_EXC_INFO_STACK`` are now disabled
in Python 3.11 and later. They are enabled again in Cython 3.0.
Patch by David Woods. (Github issue :issue:`4610`)
* A C compiler warning in older PyPy versions was resolved.
Patch by Matti Picus. (Github issue :issue:`4236`)
```
### 0.29.27
```
====================
Features added
--------------
* The ``cythonize`` command has a new option ``-M`` to generate ``.dep`` dependency
files for the compilation unit. This can be used by external build tools to track
these dependencies.
Patch by Evgeni Burovski. (Github issue :issue:`1214`)
Bugs fixed
----------
* Compilation failures on PyPy were resolved.
Patches by Matti Picus. (Github issues :issue:`4509`, :issue:`4517`)
* Calls to ``range()`` with more than three arguments did not fail.
Original patch by Max Bachmann. (Github issue :issue:`4550`)
* Some C compiler warnings about missing type struct initialisers in Py3.10 were resolved.
* Cython no longer warns about using OpenMP 3.0 features since they are now
considered generally available.
```
### 0.29.26
```
====================
Bugs fixed
----------
* An incompatibility with CPython 3.11.0a3 was resolved.
(Github issue :issue:`4499`)
* The ``in`` operator failed on literal lists with starred expressions.
Patch by Arvind Natarajan. (Github issue :issue:`3938`)
* A C compiler warning in PyPy about a missing struct field initialisation was resolved.
```
### 0.29.25
```
====================
Bugs fixed
----------
* Several incompatibilities with CPython 3.11 were resolved.
Patches by David Woods, Victor Stinner, Thomas Caswell.
(Github issues :issue:`4411`, :issue:`4414`, :issue:`4415`, :issue:`4416`, :issue:`4420`,
:issue:`4428`, :issue:`4473`, :issue:`4479`, :issue:`4480`)
* Some C compiler warnings were resolved.
Patches by Lisandro Dalcin and others. (Github issue :issue:`4439`)
* C++ ``std::move()`` should only be used automatically in MSVC versions that support it.
Patch by Max Bachmann. (Github issue :issue:`4191`)
* The ``Py_hash_t`` type failed to accept arbitrary "index" values.
(Github issue :issue:`2752`)
* Avoid copying unaligned 16-bit values since some platforms require them to be aligned.
Use memcpy() instead to let the C compiler decide how to do it.
(Github issue :issue:`4343`)
* Cython crashed on invalid truthiness tests on C++ types without ``operator bool``.
Patch by David Woods. (Github issue :issue:`4348`)
* The declaration of ``PyUnicode_CompareWithASCIIString()`` in ``cpython.unicode`` was incorrect.
Patch by Max Bachmann. (Github issue :issue:`4344`)
```
### 0.29.24
```
====================
Bugs fixed
----------
* Inline functions in pxd files that used memory views could lead to invalid
C code if the module that imported from them does not use memory views.
Patch by David Woods. (Github issue :issue:`1415`)
* Several declarations in ``libcpp.string`` were added and corrected.
Patch by Janek Bevendorff. (Github issue :issue:`4268`)
* Pickling unbound Cython compiled methods failed.
Patch by Pierre Glaser. (Github issue :issue:`2972`)
* The tracing code was adapted to work with CPython 3.10.
* The optimised ``in`` operator failed on unicode strings in Py3.9 and later
that were constructed from an external ``wchar_t`` source.
Also, related C compiler warnings about deprecated C-API usage were resolved.
(Github issue :issue:`3925`)
* Some compiler crashes were resolved.
Patch by David Woods. (Github issues :issue:`4214`, :issue:`2811`)
* An incorrect warning about 'unused' generator expressions was removed.
(GIthub issue :issue:`1699`)
* The attributes ``gen.gi_frame`` and ``coro.cr_frame`` of Cython compiled
generators and coroutines now return an actual frame object for introspection,
instead of ``None``.
(Github issue :issue:`2306`)
```
### 0.29.23
```
====================
Bugs fixed
----------
* Some problems with Python 3.10 were resolved.
Patches by Victor Stinner and David Woods. (Github issues :issue:`4046`, :issue:`4100`)
* An incorrect "optimisation" was removed that allowed changes to a keyword
dict to leak into keyword arguments passed into a function.
Patch by Peng Weikang. (Github issue :issue:`3227`)
* Multiplied str constants could end up as bytes constants with language_level=2.
Patch by Alphadelta14 and David Woods. (Github issue :issue:`3951`)
* ``PY_SSIZE_T_CLEAN`` does not get defined any more if it is already defined.
Patch by Andrew Jones. (Github issue :issue:`4104`)
```
### 0.29.22
```
====================
Features added
--------------
* Some declarations were added to the provided pxd includes.
Patches by Zackery Spytz and John Kirkham.
(Github issues :issue:`3811`, :issue:`3882`, :issue:`3899`, :issue:`3901`)
Bugs fixed
----------
* A crash when calling certain functions in Py3.9 and later was resolved.
(Github issue :issue:`3917`)
* ``const`` memory views of structs failed to compile.
(Github issue :issue:`2251`)
* ``const`` template declarations could not be nested.
Patch by Ashwin Srinath. (Github issue :issue:`1355`)
* The declarations in the ``cpython.pycapsule`` module were missing their
``const`` modifiers and generated incorrect C code.
Patch by Warren Weckesser. (Github issue :issue:`3964`)
* Casts to memory views failed for fused dtypes.
Patch by David Woods. (Github issue :issue:`3881`)
* ``repr()`` was assumed to return ``str`` instead of ``unicode`` with ``language_level=3``.
(Github issue :issue:`3736`)
* Calling ``cpdef`` functions from cimported modules crashed the compiler.
Patch by David Woods. (Github issue :issue:`4000`)
* Cython no longer validates the ABI size of the NumPy classes it compiled against.
See the discussion in https://github.com/numpy/numpy/pull/432
* A C compiler warning about enum value casting was resolved in GCC.
(Github issue :issue:`2749`)
* Coverage reporting in the annotated HTML file failed in Py3.9.
Patch by Nick Pope. (Github issue :issue:`3865`)
* The embedding code now reports Python errors as exit status.
* Long type declarations could lead to (harmless) random changes in the
C file when used in auto-generated Python wrappers or pickled classes.
Other changes
-------------
* Variables defined as ``cpdef`` now generate a warning since this
is currently useless and thus does not do what users would expect.
Patch by David Woods. (Github issue :issue:`3959`)
```
### 0.29.21
```
====================
Bugs fixed
----------
* Fix a regression in 0.29.20 where ``__div__`` failed to be found in extension types.
(Github issue :issue:`3688`)
* Fix a regression in 0.29.20 where a call inside of a finally clause could fail to compile.
Patch by David Woods. (Github issue :issue:`3712`)
* Zero-sized buffers could fail to validate as C/Fortran-contiguous.
Patch by Clemens Hofreither. (Github issue :issue:`2093`)
* ``exec()`` did not allow recent Python syntax features in Py3.8+ due to
https://bugs.python.org/issue35975.
(Github issue :issue:`3695`)
* Binding staticmethods of Cython functions were not behaving like Python methods in Py3.
Patch by Jeroen Demeyer and Michał Górny. (Github issue :issue:`3106`)
* Pythran calls to NumPy methods no longer generate useless method lookup code.
* The ``PyUnicode_GET_LENGTH()`` macro was missing from the ``cpython.*`` declarations.
Patch by Thomas Caswell. (Github issue :issue:`3692`)
* The deprecated ``PyUnicode_*()`` C-API functions are no longer used, except for Unicode
strings that contain lone surrogates. Unicode strings that contain non-BMP characters
or surrogate pairs now generate different C code on 16-bit Python 2.x Unicode deployments
(such as MS-Windows). Generating the C code on Python 3.x is recommended in this case.
Original patches by Inada Naoki and Victor Stinner.
(Github issues :issue:`3677`, :issue:`3721`, :issue:`3697`)
* Some template parameters were missing from the C++ ``std::unordered_map`` declaration.
Patch by will. (Github issue :issue:`3685`)
* Several internal code generation issues regarding temporary variables were resolved.
(Github issue :issue:`3708`)
```
### 0.29.20
```
====================
Bugs fixed
----------
* Nested try-except statements with multiple ``return`` statements could crash
due to incorrect deletion of the ``except as`` target variable.
(Github issue :issue:`3666`)
* The ``classmethod`` decorator no longer rejects unknown input from other decorators.
Patch by David Woods. (Github issue :issue:`3660`)
* Fused types could leak into unrelated usages.
Patch by David Woods. (Github issue :issue:`3642`)
* Now uses ``Py_SET_SIZE()`` and ``Py_SET_REFCNT()`` in Py3.9+ to avoid low-level
write access to these object fields.
Patch by Victor Stinner. (Github issue :issue:`3639`)
* The built-in ``abs()`` function could lead to undefined behaviour when used on
the negative-most value of a signed C integer type.
Patch by Serge Guelton. (Github issue :issue:`1911`)
* Usages of ``sizeof()`` and ``typeid()`` on uninitialised variables no longer
produce a warning.
Patch by Celelibi. (Github issue :issue:`3575`)
* The C++ ``typeid()`` function was allowed in C mode.
Patch by Celelibi. (Github issue :issue:`3637`)
* The error position reported for errors found in f-strings was misleading.
(Github issue :issue:`3674`)
* The new ``c_api_binop_methods`` directive was added for forward compatibility, but can
only be set to True (the current default value). It can be disabled in Cython 3.0.
```
### 0.29.19
```
====================
Bugs fixed
----------
* A typo in Windows specific code in 0.29.18 was fixed that broke "libc.math".
(Github issue :issue:`3622`)
* A platform specific test failure in 0.29.18 was fixed.
Patch by smutch. (Github issue :issue:`3620`)
```
### 0.29.18
```
====================
Bugs fixed
----------
* Exception position reporting could run into race conditions on threaded code.
It now uses function-local variables again.
* Error handling early in the module init code could lead to a crash.
* Error handling in ``cython.array`` creation was improved to avoid calling
C-API functions with an error held.
* A memory corruption was fixed when garbage collection was triggered during calls
to ``PyType_Ready()`` of extension type subclasses.
(Github issue :issue:`3603`)
* Memory view slicing generated unused error handling code which could negatively
impact the C compiler optimisations for parallel OpenMP code etc. Also, it is
now helped by static branch hints.
(Github issue :issue:`2987`)
* Cython's built-in OpenMP functions were not translated inside of call arguments.
Original patch by Celelibi and David Woods. (Github issue :issue:`3594`)
* Complex buffer item types of structs of arrays could fail to validate.
Patch by Leo and smutch. (Github issue :issue:`1407`)
* Decorators were not allowed on nested `async def` functions.
(Github issue :issue:`1462`)
* C-tuples could use invalid C struct casting.
Patch by MegaIng. (Github issue :issue:`3038`)
* Optimised ``%d`` string formatting into f-strings failed on float values.
(Github issue :issue:`3092`)
* Optimised aligned string formatting (``%05s``, ``%-5s``) failed.
(Github issue :issue:`3476`)
* When importing the old Cython ``build_ext`` integration with distutils, the
additional command line arguments leaked into the regular command.
Patch by Kamekameha. (Github issue :issue:`2209`)
* When using the ``CYTHON_NO_PYINIT_EXPORT`` option in C++, the module init function
was not declared as ``extern "C"``.
(Github issue :issue:`3414`)
* Three missing timedelta access macros were added in ``cpython.datetime``.
* The signature of the NumPy C-API function ``PyArray_SearchSorted()`` was fixed.
Patch by Brock Mendel. (Github issue :issue:`3606`)
```
### 0.29.17
```
====================
Features added
--------------
* ``std::move()`` is now available from ``libcpp.utility``.
Patch by Omer Ozarslan. (Github issue :issue:`2169`)
* The ``cython.binding`` decorator is available in Python code.
(Github issue :issue:`3505`)
Bugs fixed
----------
* Creating an empty unicode slice with large bounds could crash.
Patch by Sam Sneddon. (Github issue :issue:`3531`)
* Decoding an empty bytes/char* slice with large bounds could crash.
Patch by Sam Sneddon. (Github issue :issue:`3534`)
* Re-importing a Cython extension no longer raises the error
"``__reduce_cython__ not found``".
(Github issue :issue:`3545`)
* Unused C-tuples could generate incorrect code in 0.29.16.
Patch by Kirk Meyer. (Github issue :issue:`3543`)
* Creating a fused function attached it to the garbage collector before it
was fully initialised, thus risking crashes in rare failure cases.
Original patch by achernomorov. (Github issue :issue:`3215`)
* Temporary buffer indexing variables were not released and could show up in
C compiler warnings, e.g. in generators.
Patch by David Woods. (Github issues :issue:`3430`, :issue:`3522`)
* The compilation cache in ``cython.inline("…")`` failed to take the language
level into account.
Patch by will-ca. (Github issue :issue:`3419`)
* The deprecated ``PyUnicode_GET_SIZE()`` function is no longer used in Py3.
```
### 0.29.16
```
====================
Bugs fixed
----------
* Temporary internal variables in nested prange loops could leak into other
threads. Patch by Frank Schlimbach. (Github issue :issue:`3348`)
* Default arguments on fused functions could crash.
Patch by David Woods. (Github issue :issue:`3370`)
* C-tuples declared in ``.pxd`` files could generate incomplete C code.
Patch by Kirk Meyer. (Github issue :issue:`1427`)
* Fused functions were not always detected and optimised as Cython
implemented functions.
Patch by David Woods. (Github issue :issue:`3384`)
* Valid Python object concatenation of (iterable) strings to non-strings
could fail with an exception.
Patch by David Woods. (Github issue :issue:`3433`)
* Using C functions as temporary values lead to invalid C code.
Original patch by David Woods. (Github issue :issue:`3418`)
* Fix an unhandled C++ exception in comparisons.
Patch by David Woods. (Github issue :issue:`3361`)
* Fix deprecated import of "imp" module.
Patch by Matti Picus. (Github issue :issue:`3350`)
* Fix compatibility with Pythran 0.9.6 and later.
Patch by Serge Guelton. (Github issue :issue:`3308`)
* The ``_Py_PyAtExit()`` function in ``cpython.pylifecycle`` was misdeclared.
Patch by Zackery Spytz. (Github issue :issue:`3382`)
* Several missing declarations in ``cpython.*`` were added.
Patches by Zackery Spytz. (Github issue :issue:`3452`, :issue:`3421`, :issue:`3411`, :issue:`3402`)
* A declaration for ``libc.math.fpclassify()`` was added.
Patch by Zackery Spytz. (Github issue :issue:`2514`)
* Avoid "undeclared" warning about automatically generated pickle methods.
Patch by David Woods. (Github issue :issue:`3353`)
* Avoid C compiler warning about unreachable code in ``prange()``.
* Some C compiler warnings in PyPy were resolved.
Patch by Matti Picus. (Github issue :issue:`3437`)
```
### 0.29.15
```
====================
Bugs fixed
----------
* Crash when returning a temporary Python object from an async-def function.
(Github issue :issue:`3337`)
* Crash when using ``**kwargs`` in generators.
Patch by David Woods. (Github issue :issue:`3265`)
* Double reference free in ``__class__`` cell handling for ``super()`` calls.
(Github issue :issue:`3246`)
* Compile error when using ``*args`` as Python class bases.
(Github issue :issue:`3338`)
* Import failure in IPython 7.11.
(Github issue :issue:`3297`)
* Fixed C name collision in the auto-pickle code.
Patch by ThePrez. (Github issue :issue:`3238`)
* Deprecated import failed in Python 3.9.
(Github issue :issue:`3266`)
```
### 0.29.14
```
====================
Bugs fixed
----------
* The generated code failed to initialise the ``tp_print`` slot in CPython 3.8.
Patches by Pablo Galindo and Orivej Desh. (Github issues :issue:`3171`, :issue:`3201`)
* ``?`` for ``bool`` was missing from the supported NumPy dtypes.
Patch by Max Klein. (Github issue :issue:`2675`)
* ``await`` was not allowed inside of f-strings.
Patch by Dmitro Getz. (Github issue :issue:`2877`)
* Coverage analysis failed for projects where the code resides in separate
source sub-directories.
Patch by Antonio Valentino. (Github issue :issue:`1985`)
* An incorrect compiler warning was fixed in automatic C++ string conversions.
Patch by Gerion Entrup. (Github issue :issue:`3108`)
* Error reports in the Jupyter notebook showed unhelpful stack traces.
Patch by Matthew Edwards (Github issue :issue:`3196`).
* ``Python.h`` is now also included explicitly from ``public`` header files.
(Github issue :issue:`3133`).
* Distutils builds with ``--parallel`` did not work when using Cython's
deprecated ``build_ext`` command.
Patch by Alphadelta14 (Github issue :issue:`3187`).
Other changes
-------------
* The ``PyMemoryView_*()`` C-API is available in ``cpython.memoryview``.
Patch by Nathan Manville. (Github issue :issue:`2541`)
```
### 0.29.13
```
====================
Bugs fixed
----------
* A reference leak for ``None`` was fixed when converting a memoryview
to a Python object. (Github issue :issue:`3023`)
* The declaration of ``PyGILState_STATE`` in ``cpython.pystate`` was unusable.
Patch by Kirill Smelkov. (Github issue :issue:`2997`)
Other changes
-------------
* The declarations in ``posix.mman`` were extended.
Patches by Kirill Smelkov. (Github issues :issue:`2893`, :issue:`2894`, :issue:`3012`)
```
### 0.29.12
```
====================
Bugs fixed
----------
* Fix compile error in CPython 3.8b2 regarding the ``PyCode_New()`` signature.
(Github issue :issue:`3031`)
* Fix a C compiler warning about a missing ``int`` downcast.
(Github issue :issue:`3028`)
* Fix reported error positions of undefined builtins and constants.
Patch by Orivej Desh. (Github issue :issue:`3030`)
* A 32 bit issue in the Pythran support was resolved.
Patch by Serge Guelton. (Github issue :issue:`3032`)
```
### 0.29.11
```
====================
Bugs fixed
----------
* Fix compile error in CPython 3.8b2 regarding the ``PyCode_New()`` signature.
Patch by Nick Coghlan. (Github issue :issue:`3009`)
* Invalid C code generated for lambda functions in cdef methods.
Patch by Josh Tobin. (Github issue :issue:`2967`)
* Support slice handling in newer Pythran versions.
Patch by Serge Guelton. (Github issue :issue:`2989`)
* A reference leak in power-of-2 calculation was fixed.
Patch by Sebastian Berg. (Github issue :issue:`3022`)
* The search order for include files was changed. Previously it was
``include_directories``, ``Cython/Includes``, ``sys.path``. Now it is
``include_directories``, ``sys.path``, ``Cython/Includes``. This was done to
allow third-party ``*.pxd`` files to override the ones in Cython.
Original patch by Matti Picus. (Github issue :issue:`2905`)
* Setting ``language_level=2`` in a file did not work if ``language_level=3``
was enabled globally before.
Patch by Jeroen Demeyer. (Github issue :issue:`2791`)
```
### 0.29.10
```
====================
Bugs fixed
----------
* Fix compile errors in CPython 3.8b1 due to the new "tp_vectorcall" slots.
(Github issue :issue:`2976`)
```
### 0.29.9
```
===================
Bugs fixed
----------
* Fix a crash regression in 0.29.8 when creating code objects fails.
* Remove an incorrect cast when using true-division in C++ operations.
(Github issue :issue:`1950`)
```
### 0.29.8
```
===================
Bugs fixed
----------
* C compile errors with CPython 3.8 were resolved.
Patch by Marcel Plch. (Github issue :issue:`2938`)
* Python tuple constants that compare equal but have different item
types could incorrectly be merged into a single constant.
(Github issue :issue:`2919`)
* Non-ASCII characters in unprefixed strings could crash the compiler when
used with language level ``3str``.
* Starred expressions in %-formatting tuples could fail to compile for
unicode strings. (Github issue :issue:`2939`)
* Passing Python class references through ``cython.inline()`` was broken.
(Github issue :issue:`2936`)
```
### 0.29.7
```
===================
Bugs fixed
----------
* Crash when the shared Cython config module gets unloaded and another Cython
module reports an exceptions. Cython now makes sure it keeps an owned reference
to the module.
(Github issue :issue:`2885`)
* Resolved a C89 compilation problem when enabling the fast-gil sharing feature.
* Coverage reporting did not include the signature line of ``cdef`` functions.
(Github issue :issue:`1461`)
* Casting a GIL-requiring function into a nogil function now issues a warning.
(Github issue :issue:`2879`)
* Generators and coroutines were missing their return type annotation.
(Github issue :issue:`2884`)
```
### 0.29.6
```
===================
Bugs fixed
----------
* Fix a crash when accessing the ``__kwdefaults__`` special attribute of
fused functions. (Github issue :issue:`1470`)
* Fix the parsing of buffer format strings that contain numeric sizes, which
could lead to incorrect input rejections. (Github issue :issue:`2845`)
* Avoid a C pragma in old gcc versions that was only added in GCC 4.6.
Patch by Michael Anselmi. (Github issue :issue:`2838`)
* Auto-encoding of Unicode strings to UTF-8 C/C++ strings failed in Python 3,
even though the default encoding there is UTF-8.
(Github issue :issue:`2819`)
```
### 0.29.5
```
===================
Bugs fixed
----------
* Crash when defining a Python subclass of an extension type and repeatedly calling
a cpdef method on it. (Github issue :issue:`2823`)
* Compiler crash when ``prange()`` loops appear inside of with-statements.
(Github issue :issue:`2780`)
* Some C compiler warnings were resolved.
Patches by Christoph Gohlke. (Github issues :issue:`2815`, :issue:`2816`, :issue:`2817`, :issue:`2822`)
* Python conversion of C++ enums failed in 0.29.
Patch by Orivej Desh. (Github issue :issue:`2767`)
```
### 0.29.4
```
===================
Bugs fixed
----------
* Division of numeric constants by a runtime value of 0 could fail to raise a
``ZeroDivisionError``. (Github issue :issue:`2820`)
```
### 0.29.3
```
===================
Bugs fixed
----------
* Some C code for memoryviews was generated in a non-deterministic order.
Patch by Martijn van Steenbergen. (Github issue :issue:`2779`)
* C89 compatibility was accidentally lost since 0.28.
Patches by gastineau and true-pasky. (Github issues :issue:`2778`, :issue:`2801`)
* A C compiler cast warning was resolved.
Patch by Michael Buesch. (Github issue :issue:`2774`)
* An compilation failure with complex numbers under MSVC++ was resolved.
(Github issue :issue:`2797`)
* Coverage reporting could fail when modules were moved around after the build.
Patch by Wenjun Si. (Github issue :issue:`2776`)
```
### 0.29.2
```
===================
Bugs fixed
----------
* The code generated for deduplicated constants leaked some references.
(Github issue :issue:`2750`)
* The declaration of ``sigismember()`` in ``libc.signal`` was corrected.
(Github issue :issue:`2756`)
* Crashes in compiler and test runner were fixed.
(Github issue :issue:`2736`, :issue:`2755`)
* A C compiler warning about an invalid safety check was resolved.
(Github issue :issue:`2731`)
```
### 0.29.1
```
===================
Bugs fixed
----------
* Extensions compiled with MinGW-64 under Windows could misinterpret integer
objects larger than 15 bit and return incorrect results.
(Github issue :issue:`2670`)
* Cython no longer requires the source to be writable when copying its data
into a memory view slice.
Patch by Andrey Paramonov. (Github issue :issue:`2644`)
* Line tracing of ``try``-statements generated invalid C code.
(Github issue :issue:`2274`)
* When using the ``warn.undeclared`` directive, Cython's own code generated
warnings that are now fixed.
Patch by Nicolas Pauss. (Github issue :issue:`2685`)
* Cython's memoryviews no longer require strides for setting the shape field
but only the ``PyBUF_ND`` flag to be set.
Patch by John Kirkham. (Github issue :issue:`2716`)
* Some C compiler warnings about unused memoryview code were fixed.
Patch by Ho Cheuk Ting. (Github issue :issue:`2588`)
* A C compiler warning about implicit signed/unsigned conversion was fixed.
(Github issue :issue:`2729`)
* Assignments to C++ references returned by ``operator[]`` could fail to compile.
(Github issue :issue:`2671`)
* The power operator and the support for NumPy math functions were fixed
in Pythran expressions.
Patch by Serge Guelton. (Github issues :issue:`2702`, :issue:`2709`)
* Signatures with memory view arguments now show the expected type
when embedded in docstrings.
Patch by Matthew Chan and Benjamin Weigel. (Github issue :issue:`2634`)
* Some ``from ... cimport ...`` constructs were not correctly considered
when searching modified dependencies in ``cythonize()`` to decide
whether to recompile a module.
Patch by Kryštof Pilnáček. (Github issue :issue:`2638`)
* A struct field type in the ``cpython.array`` declarations was corrected.
Patch by John Kirkham. (Github issue :issue:`2712`)
```
### 0.29
```
=================
Features added
--------------
* PEP-489 multi-phase module initialisation has been enabled again. Module
reloads in other subinterpreters raise an exception to prevent corruption
of the static module state.
* A set of ``mypy`` compatible PEP-484 declarations were added for Cython's C data
types to integrate with static analysers in typed Python code. They are available
in the ``Cython/Shadow.pyi`` module and describe the types in the special ``cython``
module that can be used for typing in Python code.
Original patch by Julian Gethmann. (Github issue :issue:`1965`)
* Memoryviews are supported in PEP-484/526 style type declarations.
(Github issue :issue:`2529`)
* ``cython.nogil`` is supported as a C-function decorator in Python code.
(Github issue :issue:`2557`)
* Raising exceptions from nogil code will automatically acquire the GIL, instead
of requiring an explicit ``with gil`` block.
* C++ functions can now be declared as potentially raising both C++ and Python
exceptions, so that Cython can handle both correctly.
(Github issue :issue:`2615`)
* ``cython.inline()`` supports a direct ``language_level`` keyword argument that
was previously only available via a directive.
* A new language level name ``3str`` was added that mostly corresponds to language
level 3, but keeps unprefixed string literals as type 'str' in both Py2 and Py3,
and the builtin 'str' type unchanged. This will become the default in the next
Cython release and is meant to help user code a) transition more easily to this
new default and b) migrate to Python 3 source code semantics without making support
for Python 2.x difficult.
* In CPython 3.6 and later, looking up globals in the module dict is almost
as fast as looking up C globals.
(Github issue :issue:`2313`)
* For a Python subclass of an extension type, repeated method calls to non-overridden
cpdef methods can avoid the attribute lookup in Py3.6+, which makes them 4x faster.
(Github issue :issue:`2313`)
* (In-)equality comparisons of objects to integer literals are faster.
(Github issue :issue:`2188`)
* Some internal and 1-argument method calls are faster.
* Modules that cimport many external extension types from other Cython modules
execute less import requests during module initialisation.
* Constant tuples and slices are deduplicated and only created once per module.
(Github issue :issue:`2292`)
* The coverage plugin considers more C file extensions such as ``.cc`` and ``.cxx``.
(Github issue :issue:`2266`)
* The ``cythonize`` command accepts compile time variable values (as set by ``DEF``)
through the new ``-E`` option.
Patch by Jerome Kieffer. (Github issue :issue:`2315`)
* ``pyximport`` can import from namespace packages.
Patch by Prakhar Goel. (Github issue :issue:`2294`)
* Some missing numpy and CPython C-API declarations were added.
Patch by John Kirkham. (Github issues :issue:`2523`, :issue:`2520`, :issue:`2537`)
* Declarations for the ``pylifecycle`` C-API functions were added in a new .pxd file
``cpython.pylifecycle``.
* The Pythran support was updated to work with the latest Pythran 0.8.7.
Original patch by Adrien Guinet. (Github issue :issue:`2600`)
* ``%a`` is included in the string formatting types that are optimised into f-strings.
In this case, it is also automatically mapped to ``%r`` in Python 2.x.
* New C macro ``CYTHON_HEX_VERSION`` to access Cython's version in the same style as
``PY_VERSION_HEX``.
* Constants in ``libc.math`` are now declared as ``const`` to simplify their handling.
* An additional ``check_size`` clause was added to the ``ctypedef class`` name
specification to allow suppressing warnings when importing modules with
backwards-compatible ``PyTypeObject`` size changes.
Patch by Matti Picus. (Github issue :issue:`2627`)
Bugs fixed
----------
* The exception handling in generators and coroutines under CPython 3.7 was adapted
to the newly introduced exception stack. Users of Cython 0.28 who want to support
Python 3.7 are encouraged to upgrade to 0.29 to avoid potentially incorrect error
reporting and tracebacks. (Github issue :issue:`1958`)
* Crash when importing a module under Stackless Python that was built for CPython.
Patch by Anselm Kruis. (Github issue :issue:`2534`)
* 2-value slicing of typed sequences failed if the start or stop index was None.
Patch by Christian Gibson. (Github issue :issue:`2508`)
* Multiplied string literals lost their factor when they are part of another
constant expression (e.g. 'x' * 10 + 'y' => 'xy').
* String formatting with the '%' operator didn't call the special ``__rmod__()``
method if the right side is a string subclass that implements it.
(Python issue 28598)
* The directive ``language_level=3`` did not apply to the first token in the
source file. (Github issue :issue:`2230`)
* Overriding cpdef methods did not work in Python subclasses with slots.
Note that this can have a performance impact on calls from Cython code.
(Github issue :issue:`1771`)
* Fix declarations of builtin or C types using strings in pure python mode.
(Github issue :issue:`2046`)
* Generator expressions and lambdas failed to compile in ``cfunc`` functions.
(Github issue :issue:`459`)
* Global names with ``const`` types were not excluded from star-import assignments
which could lead to invalid C code.
(Github issue :issue:`2621`)
* Several internal function signatures were fixed that lead to warnings in gcc-8.
(Github issue :issue:`2363`)
* The numpy helper functions ``set_array_base()`` and ``get_array_base()``
were adapted to the current numpy C-API recommendations.
Patch by Matti Picus. (Github issue :issue:`2528`)
* Some NumPy related code was updated to avoid deprecated API usage.
Original patch by jbrockmendel. (Github issue :issue:`2559`)
* Several C++ STL declarations were extended and corrected.
Patch by Valentin Valls. (Github issue :issue:`2207`)
* C lines of the module init function were unconditionally not reported in
exception stack traces.
Patch by Jeroen Demeyer. (Github issue :issue:`2492`)
* When PEP-489 support is enabled, reloading the module overwrote any static
module state. It now raises an exception instead, given that reloading is
not actually supported.
* Object-returning, C++ exception throwing functions were not checking that
the return value was non-null.
Original patch by Matt Wozniski (Github issue :issue:`2603`)
* The source file encoding detection could get confused if the
``c_string_encoding`` directive appeared within the first two lines.
(Github issue :issue:`2632`)
* Cython generated modules no longer emit a warning during import when the
size of the NumPy array type is larger than what was found at compile time.
Instead, this is assumed to be a backwards compatible change on NumPy side.
Other changes
-------------
* Cython now emits a warning when no ``language_level`` (2, 3 or '3str') is set
explicitly, neither as a ``cythonize()`` option nor as a compiler directive.
This is meant to prepare the transition of the default language level from
currently Py2 to Py3, since that is what most new users will expect these days.
The future default will, however, not enforce unicode literals, because this
has proven a major obstacle in the support for both Python 2.x and 3.x. The
next major release is intended to make this change, so that it will parse all
code that does not request a specific language level as Python 3 code, but with
``str`` literals. The language level 2 will continue to be supported for an
indefinite time.
* The documentation was restructured, cleaned up and examples are now tested.
The NumPy tutorial was also rewritten to simplify the running example.
Contributed by Gabriel de Marmiesse. (Github issue :issue:`2245`)
* Cython compiles less of its own modules at build time to reduce the installed
package size to about half of its previous size. This makes the compiler
slightly slower, by about 5-7%.
```
### 0.28.6
```
===================
Bugs fixed
----------
* Extensions compiled with MinGW-64 under Windows could misinterpret integer
objects larger than 15 bit and return incorrect results.
(Github issue :issue:`2670`)
* Multiplied string literals lost their factor when they are part of another
constant expression (e.g. 'x' * 10 + 'y' => 'xy').
```
### 0.28.5
```
===================
Bugs fixed
----------
* The discouraged usage of GCC's attribute ``optimize("Os")`` was replaced by the
similar attribute ``cold`` to reduce the code impact of the module init functions.
(Github issue :issue:`2494`)
* A reference leak in Py2.x was fixed when comparing str to unicode for equality.
```
### 0.28.4
```
===================
Bugs fixed
----------
* Reallowing ``tp_clear()`` in a subtype of an ``no_gc_clear`` extension type
generated an invalid C function call to the (non-existent) base type implementation.
(Github issue :issue:`2309`)
* Exception catching based on a non-literal (runtime) tuple could fail to match the
exception. (Github issue :issue:`2425`)
* Compile fix for CPython 3.7.0a2. (Github issue :issue:`2477`)
```
### 0.28.3
```
===================
Bugs fixed
----------
* Set iteration was broken in non-CPython since 0.28.
* ``UnicodeEncodeError`` in Py2 when ``%s`` formatting is optimised for
unicode strings. (Github issue :issue:`2276`)
* Work around a crash bug in g++ 4.4.x by disabling the size reduction setting
of the module init function in this version. (Github issue :issue:`2235`)
* Crash when exceptions occur early during module initialisation.
(Github issue :issue:`2199`)
```
### 0.28.2
```
===================
Features added
--------------
* ``abs()`` is faster for Python long objects.
* The C++11 methods ``front()`` and ``end()`` were added to the declaration of
``libcpp.string``. Patch by Alex Huszagh. (Github issue :issue:`2123`)
* The C++11 methods ``reserve()`` and ``bucket_count()`` are declared for
``libcpp.unordered_map``. Patch by Valentin Valls. (Github issue :issue:`2168`)
Bugs fixed
----------
* The copy of a read-only memoryview was considered read-only as well, whereas
a common reason to copy a read-only view is to make it writable. The result
of the copying is now a writable buffer by default.
(Github issue :issue:`2134`)
* The ``switch`` statement generation failed to apply recursively to the body of
converted if-statements.
* ``NULL`` was sometimes rejected as exception return value when the returned
type is a fused pointer type.
Patch by Callie LeFave. (Github issue :issue:`2177`)
* Fixed compatibility with PyPy 5.11.
Patch by Matti Picus. (Github issue :issue:`2165`)
Other changes
-------------
* The NumPy tutorial was rewritten to use memoryviews instead of the older
buffer declaration syntax.
Contributed by Gabriel de Marmiesse. (Github issue :issue:`2162`)
```
### 0.28.1
```
===================
Bugs fixed
----------
* ``PyFrozenSet_New()`` was accidentally used in PyPy where it is missing
from the C-API.
* Assignment between some C++ templated types were incorrectly rejected
when the templates mix ``const`` with ``ctypedef``.
(Github issue :issue:`2148`)
* Undeclared C++ no-args constructors in subclasses could make the compilation
fail if the base class constructor was declared without ``nogil``.
(Github issue :issue:`2157`)
* Bytes %-formatting inferred ``basestring`` (bytes or unicode) as result type
in some cases where ``bytes`` would have been safe to infer.
(Github issue :issue:`2153`)
* ``None`` was accidentally disallowed as typed return value of ``dict.pop()``.
(Github issue :issue:`2152`)
```
### 0.28
```
=================
Features added
--------------
* Cdef classes can now multiply inherit from ordinary Python classes.
(The primary base must still be a c class, possibly ``object``, and
the other bases must *not* be cdef classes.)
* Type inference is now supported for Pythran compiled NumPy expressions.
Patch by Nils Braun. (Github issue :issue:`1954`)
* The ``const`` modifier can be applied to memoryview declarations to allow
read-only buffers as input. (Github issues :issue:`1605`, :issue:`1869`)
* C code in the docstring of a ``cdef extern`` block is copied verbatimly
into the generated file.
Patch by Jeroen Demeyer. (Github issue :issue:`1915`)
* When compiling with gcc, the module init function is now tuned for small
code size instead of whatever compile flags were provided externally.
Cython now also disables some code intensive optimisations in that function
to further reduce the code size. (Github issue :issue:`2102`)
* Decorating an async coroutine with ``cython.iterable_coroutine`` changes its
type at compile time to make it iterable. While this is not strictly in line
with PEP-492, it improves the interoperability with old-style coroutines that
use ``yield from`` instead of ``await``.
* The IPython magic has preliminary support for JupyterLab.
(Github issue :issue:`1775`)
* The new TSS C-API in CPython 3.7 is supported and has been backported.
Patch by Naotoshi Seo. (Github issue :issue:`1932`)
* Cython knows the new ``Py_tss_t`` type defined in PEP-539 and automatically
initialises variables declared with that type to ``Py_tss_NEEDS_INIT``,
a value which cannot be used outside of static assignments.
* The set methods ``.remove()`` and ``.discard()`` are optimised.
Patch by Antoine Pitrou. (Github issue :issue:`2042`)
* ``dict.pop()`` is optimised.
Original patch by Antoine Pitrou. (Github issue :issue:`2047`)
* Iteration over sets and frozensets is optimised.
(Github issue :issue:`2048`)
* Safe integer loops (< range(2^30)) are automatically optimised into C loops.
* ``alist.extend([a,b,c])`` is optimised into sequential ``list.append()`` calls
for short literal sequences.
* Calls to builtin methods that are not specifically optimised into C-API calls
now use a cache that avoids repeated lookups of the underlying C function.
(Github issue :issue:`2054`)
* Single argument function calls can avoid the argument tuple creation in some cases.
* Some redundant extension type checks are avoided.
* Formatting C enum values in f-strings is faster, as well as some other special cases.
* String formatting with the '%' operator is optimised into f-strings in simple cases.
* Subscripting (item access) is faster in some cases.
* Some ``bytearray`` operations have been optimised similar to ``bytes``.
* Some PEP-484/526 container type declarations are now considered for
loop optimisations.
* Indexing into memoryview slices with ``view[i][j]`` is now optimised into
``view[i, j]``.
* Python compatible ``cython.*`` types can now be mixed with type declarations
in Cython syntax.
* Name lookups in the module and in classes are faster.
* Python attribute lookups on extension types without instance dict are faster.
* Some missing signals were added to ``libc/signal.pxd``.
Patch by Jeroen Demeyer. (Github issue :issue:`1914`)
* The warning about repeated extern declarations is now visible by default.
(Github issue :issue:`1874`)
* The exception handling of the function types used by CPython's type slot
functions was corrected to match the de-facto standard behaviour, so that
code that uses them directly benefits from automatic and correct exception
propagation. Patch by Jeroen Demeyer. (Github issue :issue:`1980`)
* Defining the macro ``CYTHON_NO_PYINIT_EXPORT`` will prevent the module init
function from being exported as symbol, e.g. when linking modules statically
in an embedding setup. Patch by AraHaan. (Github issue :issue:`1944`)
Bugs fixed
----------
* If a module name is explicitly provided for an ``Extension()`` that is compiled
via ``cythonize()``, it was previously ignored and replaced by the source file
name. It can now be used to override the target module name, e.g. for compiling
prefixed accelerator modules from Python files. (Github issue :issue:`2038`)
* The arguments of the ``num_threads`` parameter of parallel sections
were not sufficiently validated and could lead to invalid C code.
(Github issue :issue:`1957`)
* Catching exceptions with a non-trivial exception pattern could call into
CPython with a live exception set. This triggered incorrect behaviour
and crashes, especially in CPython 3.7.
* The signature of the special ``__richcmp__()`` method was corrected to recognise
the type of the first argument as ``self``. It was previously treated as plain
object, but CPython actually guarantees that it always has the correct type.
Note: this can change the semantics of user code that previously relied on
``self`` being untyped.
* Some Python 3 exceptions were not recognised as builtins when running Cython
under Python 2.
* Some async helper functions were not defined in the generated C code when
compiling simple async code. (Github issue :issue:`2075`)
* Line tracing did not include generators and coroutines.
(Github issue :issue:`1949`)
* C++ declarations for ``unordered_map`` were corrected.
Patch by Michael Schatzow. (Github issue :issue:`1484`)
* Iterator declarations in C++ ``deque`` and ``vector`` were corrected.
Patch by Alex Huszagh. (Github issue :issue:`1870`)
* The const modifiers in the C++ ``string`` declarations were corrected, together
with the coercion behaviour of string literals into C++ strings.
(Github issue :issue:`2132`)
* Some declaration types in ``libc.limits`` were corrected.
Patch by Jeroen Demeyer. (Github issue :issue:`2016`)
* ``cython.final`` was not accepted on Python classes with an ``cython.cclass``
decorator. (Github issue :issue:`2040`)
* Cython no longer creates useless and incorrect ``PyInstanceMethod`` wrappers for
methods in Python 3. Patch by Jeroen Demeyer. (Github issue :issue:`2105`)
* The builtin ``bytearray`` type could not be used as base type of cdef classes.
(Github issue :issue:`2106`)
Other changes
-------------
```
### 0.27.3
```
===================
Bugs fixed
----------
* String forward references to extension types like ``cython.locals(x="ExtType")``
failed to find the named type. (Github issue :issue:`1962`)
* NumPy slicing generated incorrect results when compiled with Pythran.
Original patch by Serge Guelton (Github issue :issue:`1946`).
* Fix "undefined reference" linker error for generators on Windows in Py3.3-3.5.
(Github issue :issue:`1968`)
* Adapt to recent C-API change of ``PyThreadState`` in CPython 3.7.
* Fix signature of ``PyWeakref_GetObject()`` API declaration.
Patch by Jeroen Demeyer (Github issue :issue:`1975`).
```
### 0.27.2
```
===================
Bugs fixed
----------
* Comprehensions could incorrectly be optimised away when they appeared in boolean
test contexts. (Github issue :issue:`1920`)
* The special methods ``__eq__``, ``__lt__`` etc. in extension types did not type
their first argument as the type of the class but ``object``. (Github issue :issue:`1935`)
* Crash on first lookup of "cline_in_traceback" option during exception handling.
(Github issue :issue:`1907`)
* Some nested module level comprehensions failed to compile.
(Github issue :issue:`1906`)
* Compiler crash on some complex type declarations in pure mode.
(Github issue :issue:`1908`)
* ``std::unordered_map.erase()`` was declared with an incorrect ``void`` return
type in ``libcpp.unordered_map``. (Github issue :issue:`1484`)
* Invalid use of C++ ``fallthrough`` attribute before C++11 and similar issue in clang.
(Github issue :issue:`1930`)
* Compiler crash on misnamed properties. (Github issue :issue:`1905`)
```
### 0.27.1
```
===================
Features added
--------------
* The Jupyter magic has a new debug option ``--verbose`` that shows details about
the distutils invocation. Patch by Boris Filippov (Github issue :issue:`1881`).
Bugs fixed
----------
* Py3 list comprehensions in class bodies resulted in invalid C code.
(Github issue :issue:`1889`)
* Modules built for later CPython 3.5.x versions failed to import in 3.5.0/3.5.1.
(Github issue :issue:`1880`)
* Deallocating fused types functions and methods kept their GC tracking enabled,
which could potentially lead to recursive deallocation attempts.
* Crash when compiling in C++ mode with old setuptools versions.
(Github issue :issue:`1879`)
* C++ object arguments for the constructor of Cython implemented C++ are now
passed by reference and not by value to allow for non-copyable arguments, such
as ``unique_ptr``.
* API-exported C++ classes with Python object members failed to compile.
(Github issue :issue:`1866`)
* Some issues with the new relaxed exception value handling were resolved.
* Python classes as annotation types could prevent compilation.
(Github issue :issue:`1887`)
* Cython annotation types in Python files could lead to import failures
with a "cython undefined" error. Recognised types are now turned into strings.
* Coverage analysis could fail to report on extension modules on some platforms.
* Annotations could be parsed (and rejected) as types even with
``annotation_typing=False``.
Other changes
-------------
* PEP 489 support has been disabled by default to counter incompatibilities with
import setups that try to reload or reinitialise modules.
```
### 0.27
```
=================
Features added
--------------
* Extension module initialisation follows
`PEP 489 <https://www.python.org/dev/peps/pep-0489/>`_ in CPython 3.5+, which
resolves several differences with regard to normal Python modules. This makes
the global names ``__file__`` and ``__path__`` correctly available to module
level code and improves the support for module-level relative imports.
(Github issues :issue:`1715`, :issue:`1753`, :issue:`1035`)
* Asynchronous generators (`PEP 525 <https://www.python.org/dev/peps/pep-0525/>`_)
and asynchronous comprehensions (`PEP 530 <https://www.python.org/dev/peps/pep-0530/>`_)
have been implemented. Note that async generators require finalisation support
in order to allow for asynchronous operations during cleanup, which is only
available in CPython 3.6+. All other functionality has been backported as usual.
* Variable annotations are now parsed according to
`PEP 526 <https://www.python.org/dev/peps/pep-0526/>`_. Cython types (e.g.
``cython.int``) are evaluated as C type declarations and everything else as Python
types. This can be disabled with the directive ``annotation_typing=False``.
Note that most complex PEP-484 style annotations are currently ignored. This will
change in future releases. (Github issue :issue:`1850`)
* Extension types (also in pure Python mode) can implement the normal special methods
``__eq__``, ``__lt__`` etc. for comparisons instead of the low-level ``__richcmp__``
method. (Github issue :issue:`690`)
* New decorator ``cython.exceptval(x=None, check=False)`` that makes the signature
declarations ``except x``, ``except? x`` and ``except *`` available to pure Python
code. Original patch by Antonio Cuni. (Github issue :issue:`1653`)
* Signature annotations are now included in the signature docstring generated by
the ``embedsignature`` directive. Patch by Lisandro Dalcin (Github issue :issue:`1781`).
* The gdb support for Python code (``libpython.py``) was updated to the latest
version in CPython 3.7 (git rev 5fe59f8).
* The compiler tries to find a usable exception return value for cdef functions
with ``except *`` if the returned type allows it. Note that this feature is subject
to safety limitations, so it is still better to provide an explicit declaration.
* C functions can be assigned to function pointers with a compatible exception
declaration, not only with exact matches. A side-effect is that certain compatible
signature overrides are now allowed and some more mismatches of exception signatures
are now detected and rejected as errors that were not detected before.
* The IPython/Jupyter magic integration has a new option ``%%cython --pgo`` for profile
guided optimisation. It compiles the cell with PGO settings for the C compiler,
executes it to generate a runtime profile, and then compiles it again using that
profile for C compiler optimisation. Currently only tested with gcc.
* ``len(memoryview)`` can be used in nogil sections to get the size of the
first dimension of a memory view (``shape[0]``). (Github issue :issue:`1733`)
* C++ classes can now contain (properly refcounted) Python objects.
* NumPy dtype subarrays are now accessible through the C-API.
Patch by Gerald Dalley (Github issue :issue:`245`).
* Resolves several issues with PyPy and uses faster async slots in PyPy3.
Patch by Ronan Lamy (Github issues :issue:`1871`, :issue:`1878`).
Bugs fixed
----------
* Extension types that were cimported from other Cython modules could disagree
about the order of fused cdef methods in their call table. This could lead
to wrong methods being called and potentially also crashes. The fix required
changes to the ordering of fused methods in the call table, which may break
existing compiled modules that call fused cdef methods across module boundaries,
if these methods were implemented in a different order than they were declared
in the corresponding .pxd file. (Github issue :issue:`1873`)
* The exception state handling in generators and coroutines could lead to
exceptions in the caller being lost if an exception was raised and handled
inside of the coroutine when yielding. (Github issue :issue:`1731`)
* Loops over ``range(enum)`` were not converted into C for-loops. Note that it
is still recommended to use an explicit cast to a C integer type in this case.
* Error positions of names (e.g. variables) were incorrectly reported after the
name and not at the beginning of the name.
* Compile time ``DEF`` assignments were evaluated even when they occur inside of
falsy ``IF`` blocks. (Github issue :issue:`1796`)
* Disabling the line tracing from a trace function could fail.
Original patch by Dmitry Trofimov. (Github issue :issue:`1769`)
* Several issues with the Pythran integration were resolved.
* abs(signed int) now returns a signed rather than unsigned int.
(Github issue :issue:`1837`)
* Reading ``frame.f_locals`` of a Cython function (e.g. from a debugger or profiler
could modify the module globals. (Github issue :issue:`1836`)
* Buffer type mismatches in the NumPy buffer support could leak a reference to the
buffer owner.
* Using the "is_f_contig" and "is_c_contig" memoryview methods together could leave
one of them undeclared. (Github issue :issue:`1872`)
* Compilation failed if the for-in-range loop target was not a variable but a more
complex expression, e.g. an item assignment. (Github issue :issue:`1831`)
* Compile time evaluations of (partially) constant f-strings could show incorrect
results.
* Escape sequences in raw f-strings (``fr'...'``) were resolved instead of passing
them through as expected.
* Some ref-counting issues in buffer error handling have been resolved.
Other changes
-------------
* Type declarations in signature annotations are now parsed according to
`PEP 484 <https://www.python.org/dev/peps/pep-0484/>`_
typing. Only Cython types (e.g. ``cython.int``) and Python builtin types are
currently considered as type declarations. Everything else is ignored, but this
will change in a future Cython release.
(Github issue :issue:`1672`)
* The directive ``annotation_typing`` is now ``True`` by default, which enables
parsing type declarations from annotations.
* This release no longer supports Python 3.2.
```
### 0.26.1
```
===================
Features added
--------------
Bugs fixed
----------
* ``cython.view.array`` was missing ``.__len__()``.
* Extension types with a ``.pxd`` override for their ``__releasebuffer__`` slot
(e.g. as provided by Cython for the Python ``array.array`` type) could leak
a reference to the buffer owner on release, thus not freeing the memory.
(Github issue :issue:`1638`)
* Auto-decoding failed in 0.26 for strings inside of C++ containers.
(Github issue :issue:`1790`)
* Compile error when inheriting from C++ container types.
(Github issue :issue:`1788`)
* Invalid C code in generators (declaration after code).
(Github issue :issue:`1801`)
* Arithmetic operations on ``const`` integer variables could generate invalid code.
(Github issue :issue:`1798`)
* Local variables with names of special Python methods failed to compile inside of
closures. (Github issue :issue:`1797`)
* Problem with indirect Emacs buffers in cython-mode.
Patch by Martin Albrecht (Github issue :issue:`1743`).
* Extension types named ``result`` or ``PickleError`` generated invalid unpickling code.
Patch by Jason Madden (Github issue :issue:`1786`).
* Bazel integration failed to compile ``.py`` files.
Patch by Guro Bokum (Github issue :issue:`1784`).
* Some include directories and dependencies were referenced with their absolute paths
in the generated files despite lying within the project directory.
* Failure to compile in Py3.7 due to a modified signature of ``_PyCFunctionFast()``
```
### 0.26
```
=================
Features added
--------------
* Pythran can be used as a backend for evaluating NumPy array expressions.
Patch by Adrien Guinet (Github issue :issue:`1607`).
* cdef classes now support pickling by default when possible.
This can b
pyup-bot
commented
1 year ago
This PR updates Cython from 0.24 to 0.29.35.
Changelog
### 0.29.35 ``` ==================== Bugs fixed ---------- * A garbage collection enabled subtype of a non-GC extension type could call into the deallocation function of the super type with GC tracking enabled. This could lead to crashes during deallocation if GC was triggered on the type at the same time. (Github issue :issue:`5432`) * Some C compile failures and crashes in CPython 3.12 were resolved. * ``except + nogil`` was syntactically not allowed. ``except +nogil`` (i.e. defining a C++ exception handling function called ``nogil``) is now disallowed to prevent typos. (Github issue :issue:`5430`) * A C compile failure in PyPy 3.10 was resolved. Patch by Matti Picus. (Github issue :issue:`5408`) * Cython modules now use PEP-489 multi-phase init by default in PyPy 3.9 and later. Original patch by Matti Picus. (Github issue :issue:`5413`) * API header files generated by different Cython versions can now be included in the same C file. (Github issue :issue:`5383`) * Function signatures containing a type like `tuple[()]` could not be printed. Patch by Lisandro Dalcin. (Github issue :issue:`5355`) ``` ### 0.29.34 ``` ==================== Bugs fixed ---------- * A refence leak of the for-loop list/tuple iterable was resolved if the for-loop's ``else:`` branch executes a ``break`` for an outer loop. (Github issue :issue:`5347`) * Some C compile failures in CPython 3.12 were resolved. * Some old usages of the deprecated Python ``imp`` module were replaced with ``importlib``. Patch by Matúš Valo. (Github issue :issue:`5300`) * Some issues with ``depfile`` generation were resolved. Patches by Eli Schwartz. (Github issues :issue:`5279`, :issue:`5291`) ``` ### 0.29.33 ``` ==================== Features added -------------- * The ``cythonize`` and ``cython`` commands have a new option ``-M`` / ``--depfile`` to generate ``.dep`` dependency files for the compilation unit. This can be used by external build tools to track these dependencies. The ``cythonize`` option was already available in Cython :ref:`0.29.27`. Patches by Evgeni Burovski and Eli Schwartz. (Github issue :issue:`1214`) Bugs fixed ---------- * ``const`` fused types could not be used with memory views. Patch by Thomas Vincent. (Github issue :issue:`1772`) * ``wstr`` usage was removed in Python 3.12 and later (PEP-623). (Github issue :issue:`5145`) * A type check assertion for Cython functions failed in debug Python builds. (Github issue :issue:`5031`) * Fixed various compiler warnings. Patches by Lisandro Dalcin et al. (Github issues :issue:`4948`, :issue:`5086`) * Fixed error when calculating complex powers of negative numbers. (Github issue :issue:`5014`) * Corrected a small mis-formatting of exception messages on Python 2. (Github issue :issue:`5018`) * The ``PyUnicode_AsUTF8AndSize()`` C-API function was missing from the CPython declarations. (Github issue :issue:`5163`) * A performance problem in the compiler was resolved when nesting conditional expressions. (Github issue :issue:`5197`) * Test suite problems with recent NumPy and CPython versions were resolved. (Github issues :issue:`5183`, :issue:`5190`) Other changes ------------- * The undocumented, untested and apparently useless syntax ``from somemodule cimport class/struct/union somename`` was deprecated in anticipation of its removal in Cython 3. The type modifier is not needed here and a plain ``cimport`` of the name will do. (Github issue :issue:`4905`) * Properly disable generation of descriptor docstrings on PyPy since they cause crashes. It was previously disabled, but only accidentally via a typo. Patch by Matti Picus. (Github issue :issue:`5083`) * The ``cpow`` directive of Cython 3.0 is available as a no-op. (Github issue :issue:`5016`) ``` ### 0.29.32 ``` ==================== Bugs fixed ---------- * Revert "Using memoryview typed arguments in inner functions is now rejected as unsupported." Patch by David Woods. (Github issue :issue:`4798`) * ``from module import *`` failed in 0.29.31 when using memoryviews. Patch by David Woods. (Github issue :issue:`4927`) ``` ### 0.29.31 ``` ==================== Features added -------------- * A new argument ``--module-name`` was added to the ``cython`` command to provide the (one) exact target module name from the command line. Patch by Matthew Brett and h-vetinari. (Github issue :issue:`4906`) * A new keyword ``noexcept`` was added for forward compatibility with Cython 3. Patch by David Woods. (Github issue :issue:`4903`) Bugs fixed ---------- * Use ``importlib.util.find_spec()`` instead of the deprecated ``importlib.find_loader()`` function when setting up the package path at import-time. Patch by Matti Picus. (Github issue :issue:`4764`) * Require the C compiler to support the two-arg form of ``va_start`` on Python 3.10 and higher. Patch by Thomas Caswell. (Github issue :issue:`4820`) * Make ``fused_type`` subscriptable in Shadow.py. Patch by Pfebrer. (Github issue :issue:`4842`) * Fix the incorrect code generation of the target type in ``bytearray`` loops. Patch by Kenrick Everett. (Github issue :issue:`4108`) * Atomic refcounts for memoryviews were not used on some GCC versions by accident. Patch by Sam Gross. (Github issue :issue:`4915`) * Silence some GCC ``-Wconversion`` warnings in C utility code. Patch by Lisandro Dalcin. (Github issue :issue:`4854`) * Tuple multiplication was ignored in expressions such as ``[*(1,) * 2]``. Patch by David Woods. (Github issue :issue:`4864`) * Calling ``append`` methods on extension types could fail to find the method in some cases. Patch by David Woods. (Github issue :issue:`4828`) * Ensure that object buffers (e.g. ``ndarray[object, ndim=1]``) containing ``NULL`` pointers are safe to use, returning ``None`` instead of the ``NULL`` pointer. Patch by Sebastian Berg. (Github issue :issue:`4859`) * Using memoryview typed arguments in inner functions is now rejected as unsupported. Patch by David Woods. (Github issue :issue:`4798`) * Compilation could fail on systems (e.g. FIPS) that block MD5 checksums at runtime. (Github issue :issue:`4909`) * Experimental adaptations for the CPython "nogil" fork was added. Note that there is no official support for this in Cython 0.x. Patch by Sam Gross. (Github issue :issue:`4912`) ``` ### 0.29.30 ``` ==================== Bugs fixed ---------- * The GIL handling changes in 0.29.29 introduced a regression where objects could be deallocated without holding the GIL. (Github issue :issue:`4796`) ``` ### 0.29.29 ``` ==================== Features added -------------- * Avoid acquiring the GIL at the end of nogil functions. This change was backported in order to avoid generating wrong C code that would trigger C compiler warnings with tracing support enabled. Backport by Oleksandr Pavlyk. (Github issue :issue:`4637`) Bugs fixed ---------- * Function definitions in ``finally:`` clauses were not correctly generated. Patch by David Woods. (Github issue :issue:`4651`) * A case where C-API functions could be called with a live exception set was fixed. Patch by Jakub Kulík. (Github issue :issue:`4722`) * Pickles can now be exchanged again with those generated from Cython 3.0 modules. (Github issue :issue:`4680`) * Cython now correctly generates Python methods for both the provided regular and reversed special numeric methods of extension types. Patch by David Woods. (Github issue :issue:`4750`) * Calling unbound extension type methods without arguments could raise an ``IndexError`` instead of a ``TypeError``. Patch by David Woods. (Github issue :issue:`4779`) * Calling unbound ``.__contains__()`` super class methods on some builtin base types could trigger an infinite recursion. Patch by David Woods. (Github issue :issue:`4785`) * The C union type in pure Python mode mishandled some field names. Patch by Jordan Brière. (Github issue :issue:`4727`) * Allow users to overwrite the C macro ``_USE_MATH_DEFINES``. Patch by Yuriy Chernyshov. (Github issue :issue:`4690`) * Improved compatibility with CPython 3.10/11. Patches by Thomas Caswell, David Woods. (Github issues :issue:`4609`, :issue:`4667`, :issue:`4721`, :issue:`4730`, :issue:`4777`) * Docstrings of descriptors are now provided in PyPy 7.3.9. Patch by Matti Picus. (Github issue :issue:`4701`) ``` ### 0.29.28 ``` ==================== Bugs fixed ---------- * Due to backwards incompatible changes in CPython 3.11a4, the feature flags ``CYTHON_FAST_THREAD_STATE`` and ``CYTHON_USE_EXC_INFO_STACK`` are now disabled in Python 3.11 and later. They are enabled again in Cython 3.0. Patch by David Woods. (Github issue :issue:`4610`) * A C compiler warning in older PyPy versions was resolved. Patch by Matti Picus. (Github issue :issue:`4236`) ``` ### 0.29.27 ``` ==================== Features added -------------- * The ``cythonize`` command has a new option ``-M`` to generate ``.dep`` dependency files for the compilation unit. This can be used by external build tools to track these dependencies. Patch by Evgeni Burovski. (Github issue :issue:`1214`) Bugs fixed ---------- * Compilation failures on PyPy were resolved. Patches by Matti Picus. (Github issues :issue:`4509`, :issue:`4517`) * Calls to ``range()`` with more than three arguments did not fail. Original patch by Max Bachmann. (Github issue :issue:`4550`) * Some C compiler warnings about missing type struct initialisers in Py3.10 were resolved. * Cython no longer warns about using OpenMP 3.0 features since they are now considered generally available. ``` ### 0.29.26 ``` ==================== Bugs fixed ---------- * An incompatibility with CPython 3.11.0a3 was resolved. (Github issue :issue:`4499`) * The ``in`` operator failed on literal lists with starred expressions. Patch by Arvind Natarajan. (Github issue :issue:`3938`) * A C compiler warning in PyPy about a missing struct field initialisation was resolved. ``` ### 0.29.25 ``` ==================== Bugs fixed ---------- * Several incompatibilities with CPython 3.11 were resolved. Patches by David Woods, Victor Stinner, Thomas Caswell. (Github issues :issue:`4411`, :issue:`4414`, :issue:`4415`, :issue:`4416`, :issue:`4420`, :issue:`4428`, :issue:`4473`, :issue:`4479`, :issue:`4480`) * Some C compiler warnings were resolved. Patches by Lisandro Dalcin and others. (Github issue :issue:`4439`) * C++ ``std::move()`` should only be used automatically in MSVC versions that support it. Patch by Max Bachmann. (Github issue :issue:`4191`) * The ``Py_hash_t`` type failed to accept arbitrary "index" values. (Github issue :issue:`2752`) * Avoid copying unaligned 16-bit values since some platforms require them to be aligned. Use memcpy() instead to let the C compiler decide how to do it. (Github issue :issue:`4343`) * Cython crashed on invalid truthiness tests on C++ types without ``operator bool``. Patch by David Woods. (Github issue :issue:`4348`) * The declaration of ``PyUnicode_CompareWithASCIIString()`` in ``cpython.unicode`` was incorrect. Patch by Max Bachmann. (Github issue :issue:`4344`) ``` ### 0.29.24 ``` ==================== Bugs fixed ---------- * Inline functions in pxd files that used memory views could lead to invalid C code if the module that imported from them does not use memory views. Patch by David Woods. (Github issue :issue:`1415`) * Several declarations in ``libcpp.string`` were added and corrected. Patch by Janek Bevendorff. (Github issue :issue:`4268`) * Pickling unbound Cython compiled methods failed. Patch by Pierre Glaser. (Github issue :issue:`2972`) * The tracing code was adapted to work with CPython 3.10. * The optimised ``in`` operator failed on unicode strings in Py3.9 and later that were constructed from an external ``wchar_t`` source. Also, related C compiler warnings about deprecated C-API usage were resolved. (Github issue :issue:`3925`) * Some compiler crashes were resolved. Patch by David Woods. (Github issues :issue:`4214`, :issue:`2811`) * An incorrect warning about 'unused' generator expressions was removed. (GIthub issue :issue:`1699`) * The attributes ``gen.gi_frame`` and ``coro.cr_frame`` of Cython compiled generators and coroutines now return an actual frame object for introspection, instead of ``None``. (Github issue :issue:`2306`) ``` ### 0.29.23 ``` ==================== Bugs fixed ---------- * Some problems with Python 3.10 were resolved. Patches by Victor Stinner and David Woods. (Github issues :issue:`4046`, :issue:`4100`) * An incorrect "optimisation" was removed that allowed changes to a keyword dict to leak into keyword arguments passed into a function. Patch by Peng Weikang. (Github issue :issue:`3227`) * Multiplied str constants could end up as bytes constants with language_level=2. Patch by Alphadelta14 and David Woods. (Github issue :issue:`3951`) * ``PY_SSIZE_T_CLEAN`` does not get defined any more if it is already defined. Patch by Andrew Jones. (Github issue :issue:`4104`) ``` ### 0.29.22 ``` ==================== Features added -------------- * Some declarations were added to the provided pxd includes. Patches by Zackery Spytz and John Kirkham. (Github issues :issue:`3811`, :issue:`3882`, :issue:`3899`, :issue:`3901`) Bugs fixed ---------- * A crash when calling certain functions in Py3.9 and later was resolved. (Github issue :issue:`3917`) * ``const`` memory views of structs failed to compile. (Github issue :issue:`2251`) * ``const`` template declarations could not be nested. Patch by Ashwin Srinath. (Github issue :issue:`1355`) * The declarations in the ``cpython.pycapsule`` module were missing their ``const`` modifiers and generated incorrect C code. Patch by Warren Weckesser. (Github issue :issue:`3964`) * Casts to memory views failed for fused dtypes. Patch by David Woods. (Github issue :issue:`3881`) * ``repr()`` was assumed to return ``str`` instead of ``unicode`` with ``language_level=3``. (Github issue :issue:`3736`) * Calling ``cpdef`` functions from cimported modules crashed the compiler. Patch by David Woods. (Github issue :issue:`4000`) * Cython no longer validates the ABI size of the NumPy classes it compiled against. See the discussion in https://github.com/numpy/numpy/pull/432 * A C compiler warning about enum value casting was resolved in GCC. (Github issue :issue:`2749`) * Coverage reporting in the annotated HTML file failed in Py3.9. Patch by Nick Pope. (Github issue :issue:`3865`) * The embedding code now reports Python errors as exit status. * Long type declarations could lead to (harmless) random changes in the C file when used in auto-generated Python wrappers or pickled classes. Other changes ------------- * Variables defined as ``cpdef`` now generate a warning since this is currently useless and thus does not do what users would expect. Patch by David Woods. (Github issue :issue:`3959`) ``` ### 0.29.21 ``` ==================== Bugs fixed ---------- * Fix a regression in 0.29.20 where ``__div__`` failed to be found in extension types. (Github issue :issue:`3688`) * Fix a regression in 0.29.20 where a call inside of a finally clause could fail to compile. Patch by David Woods. (Github issue :issue:`3712`) * Zero-sized buffers could fail to validate as C/Fortran-contiguous. Patch by Clemens Hofreither. (Github issue :issue:`2093`) * ``exec()`` did not allow recent Python syntax features in Py3.8+ due to https://bugs.python.org/issue35975. (Github issue :issue:`3695`) * Binding staticmethods of Cython functions were not behaving like Python methods in Py3. Patch by Jeroen Demeyer and Michał Górny. (Github issue :issue:`3106`) * Pythran calls to NumPy methods no longer generate useless method lookup code. * The ``PyUnicode_GET_LENGTH()`` macro was missing from the ``cpython.*`` declarations. Patch by Thomas Caswell. (Github issue :issue:`3692`) * The deprecated ``PyUnicode_*()`` C-API functions are no longer used, except for Unicode strings that contain lone surrogates. Unicode strings that contain non-BMP characters or surrogate pairs now generate different C code on 16-bit Python 2.x Unicode deployments (such as MS-Windows). Generating the C code on Python 3.x is recommended in this case. Original patches by Inada Naoki and Victor Stinner. (Github issues :issue:`3677`, :issue:`3721`, :issue:`3697`) * Some template parameters were missing from the C++ ``std::unordered_map`` declaration. Patch by will. (Github issue :issue:`3685`) * Several internal code generation issues regarding temporary variables were resolved. (Github issue :issue:`3708`) ``` ### 0.29.20 ``` ==================== Bugs fixed ---------- * Nested try-except statements with multiple ``return`` statements could crash due to incorrect deletion of the ``except as`` target variable. (Github issue :issue:`3666`) * The ``classmethod`` decorator no longer rejects unknown input from other decorators. Patch by David Woods. (Github issue :issue:`3660`) * Fused types could leak into unrelated usages. Patch by David Woods. (Github issue :issue:`3642`) * Now uses ``Py_SET_SIZE()`` and ``Py_SET_REFCNT()`` in Py3.9+ to avoid low-level write access to these object fields. Patch by Victor Stinner. (Github issue :issue:`3639`) * The built-in ``abs()`` function could lead to undefined behaviour when used on the negative-most value of a signed C integer type. Patch by Serge Guelton. (Github issue :issue:`1911`) * Usages of ``sizeof()`` and ``typeid()`` on uninitialised variables no longer produce a warning. Patch by Celelibi. (Github issue :issue:`3575`) * The C++ ``typeid()`` function was allowed in C mode. Patch by Celelibi. (Github issue :issue:`3637`) * The error position reported for errors found in f-strings was misleading. (Github issue :issue:`3674`) * The new ``c_api_binop_methods`` directive was added for forward compatibility, but can only be set to True (the current default value). It can be disabled in Cython 3.0. ``` ### 0.29.19 ``` ==================== Bugs fixed ---------- * A typo in Windows specific code in 0.29.18 was fixed that broke "libc.math". (Github issue :issue:`3622`) * A platform specific test failure in 0.29.18 was fixed. Patch by smutch. (Github issue :issue:`3620`) ``` ### 0.29.18 ``` ==================== Bugs fixed ---------- * Exception position reporting could run into race conditions on threaded code. It now uses function-local variables again. * Error handling early in the module init code could lead to a crash. * Error handling in ``cython.array`` creation was improved to avoid calling C-API functions with an error held. * A memory corruption was fixed when garbage collection was triggered during calls to ``PyType_Ready()`` of extension type subclasses. (Github issue :issue:`3603`) * Memory view slicing generated unused error handling code which could negatively impact the C compiler optimisations for parallel OpenMP code etc. Also, it is now helped by static branch hints. (Github issue :issue:`2987`) * Cython's built-in OpenMP functions were not translated inside of call arguments. Original patch by Celelibi and David Woods. (Github issue :issue:`3594`) * Complex buffer item types of structs of arrays could fail to validate. Patch by Leo and smutch. (Github issue :issue:`1407`) * Decorators were not allowed on nested `async def` functions. (Github issue :issue:`1462`) * C-tuples could use invalid C struct casting. Patch by MegaIng. (Github issue :issue:`3038`) * Optimised ``%d`` string formatting into f-strings failed on float values. (Github issue :issue:`3092`) * Optimised aligned string formatting (``%05s``, ``%-5s``) failed. (Github issue :issue:`3476`) * When importing the old Cython ``build_ext`` integration with distutils, the additional command line arguments leaked into the regular command. Patch by Kamekameha. (Github issue :issue:`2209`) * When using the ``CYTHON_NO_PYINIT_EXPORT`` option in C++, the module init function was not declared as ``extern "C"``. (Github issue :issue:`3414`) * Three missing timedelta access macros were added in ``cpython.datetime``. * The signature of the NumPy C-API function ``PyArray_SearchSorted()`` was fixed. Patch by Brock Mendel. (Github issue :issue:`3606`) ``` ### 0.29.17 ``` ==================== Features added -------------- * ``std::move()`` is now available from ``libcpp.utility``. Patch by Omer Ozarslan. (Github issue :issue:`2169`) * The ``cython.binding`` decorator is available in Python code. (Github issue :issue:`3505`) Bugs fixed ---------- * Creating an empty unicode slice with large bounds could crash. Patch by Sam Sneddon. (Github issue :issue:`3531`) * Decoding an empty bytes/char* slice with large bounds could crash. Patch by Sam Sneddon. (Github issue :issue:`3534`) * Re-importing a Cython extension no longer raises the error "``__reduce_cython__ not found``". (Github issue :issue:`3545`) * Unused C-tuples could generate incorrect code in 0.29.16. Patch by Kirk Meyer. (Github issue :issue:`3543`) * Creating a fused function attached it to the garbage collector before it was fully initialised, thus risking crashes in rare failure cases. Original patch by achernomorov. (Github issue :issue:`3215`) * Temporary buffer indexing variables were not released and could show up in C compiler warnings, e.g. in generators. Patch by David Woods. (Github issues :issue:`3430`, :issue:`3522`) * The compilation cache in ``cython.inline("…")`` failed to take the language level into account. Patch by will-ca. (Github issue :issue:`3419`) * The deprecated ``PyUnicode_GET_SIZE()`` function is no longer used in Py3. ``` ### 0.29.16 ``` ==================== Bugs fixed ---------- * Temporary internal variables in nested prange loops could leak into other threads. Patch by Frank Schlimbach. (Github issue :issue:`3348`) * Default arguments on fused functions could crash. Patch by David Woods. (Github issue :issue:`3370`) * C-tuples declared in ``.pxd`` files could generate incomplete C code. Patch by Kirk Meyer. (Github issue :issue:`1427`) * Fused functions were not always detected and optimised as Cython implemented functions. Patch by David Woods. (Github issue :issue:`3384`) * Valid Python object concatenation of (iterable) strings to non-strings could fail with an exception. Patch by David Woods. (Github issue :issue:`3433`) * Using C functions as temporary values lead to invalid C code. Original patch by David Woods. (Github issue :issue:`3418`) * Fix an unhandled C++ exception in comparisons. Patch by David Woods. (Github issue :issue:`3361`) * Fix deprecated import of "imp" module. Patch by Matti Picus. (Github issue :issue:`3350`) * Fix compatibility with Pythran 0.9.6 and later. Patch by Serge Guelton. (Github issue :issue:`3308`) * The ``_Py_PyAtExit()`` function in ``cpython.pylifecycle`` was misdeclared. Patch by Zackery Spytz. (Github issue :issue:`3382`) * Several missing declarations in ``cpython.*`` were added. Patches by Zackery Spytz. (Github issue :issue:`3452`, :issue:`3421`, :issue:`3411`, :issue:`3402`) * A declaration for ``libc.math.fpclassify()`` was added. Patch by Zackery Spytz. (Github issue :issue:`2514`) * Avoid "undeclared" warning about automatically generated pickle methods. Patch by David Woods. (Github issue :issue:`3353`) * Avoid C compiler warning about unreachable code in ``prange()``. * Some C compiler warnings in PyPy were resolved. Patch by Matti Picus. (Github issue :issue:`3437`) ``` ### 0.29.15 ``` ==================== Bugs fixed ---------- * Crash when returning a temporary Python object from an async-def function. (Github issue :issue:`3337`) * Crash when using ``**kwargs`` in generators. Patch by David Woods. (Github issue :issue:`3265`) * Double reference free in ``__class__`` cell handling for ``super()`` calls. (Github issue :issue:`3246`) * Compile error when using ``*args`` as Python class bases. (Github issue :issue:`3338`) * Import failure in IPython 7.11. (Github issue :issue:`3297`) * Fixed C name collision in the auto-pickle code. Patch by ThePrez. (Github issue :issue:`3238`) * Deprecated import failed in Python 3.9. (Github issue :issue:`3266`) ``` ### 0.29.14 ``` ==================== Bugs fixed ---------- * The generated code failed to initialise the ``tp_print`` slot in CPython 3.8. Patches by Pablo Galindo and Orivej Desh. (Github issues :issue:`3171`, :issue:`3201`) * ``?`` for ``bool`` was missing from the supported NumPy dtypes. Patch by Max Klein. (Github issue :issue:`2675`) * ``await`` was not allowed inside of f-strings. Patch by Dmitro Getz. (Github issue :issue:`2877`) * Coverage analysis failed for projects where the code resides in separate source sub-directories. Patch by Antonio Valentino. (Github issue :issue:`1985`) * An incorrect compiler warning was fixed in automatic C++ string conversions. Patch by Gerion Entrup. (Github issue :issue:`3108`) * Error reports in the Jupyter notebook showed unhelpful stack traces. Patch by Matthew Edwards (Github issue :issue:`3196`). * ``Python.h`` is now also included explicitly from ``public`` header files. (Github issue :issue:`3133`). * Distutils builds with ``--parallel`` did not work when using Cython's deprecated ``build_ext`` command. Patch by Alphadelta14 (Github issue :issue:`3187`). Other changes ------------- * The ``PyMemoryView_*()`` C-API is available in ``cpython.memoryview``. Patch by Nathan Manville. (Github issue :issue:`2541`) ``` ### 0.29.13 ``` ==================== Bugs fixed ---------- * A reference leak for ``None`` was fixed when converting a memoryview to a Python object. (Github issue :issue:`3023`) * The declaration of ``PyGILState_STATE`` in ``cpython.pystate`` was unusable. Patch by Kirill Smelkov. (Github issue :issue:`2997`) Other changes ------------- * The declarations in ``posix.mman`` were extended. Patches by Kirill Smelkov. (Github issues :issue:`2893`, :issue:`2894`, :issue:`3012`) ``` ### 0.29.12 ``` ==================== Bugs fixed ---------- * Fix compile error in CPython 3.8b2 regarding the ``PyCode_New()`` signature. (Github issue :issue:`3031`) * Fix a C compiler warning about a missing ``int`` downcast. (Github issue :issue:`3028`) * Fix reported error positions of undefined builtins and constants. Patch by Orivej Desh. (Github issue :issue:`3030`) * A 32 bit issue in the Pythran support was resolved. Patch by Serge Guelton. (Github issue :issue:`3032`) ``` ### 0.29.11 ``` ==================== Bugs fixed ---------- * Fix compile error in CPython 3.8b2 regarding the ``PyCode_New()`` signature. Patch by Nick Coghlan. (Github issue :issue:`3009`) * Invalid C code generated for lambda functions in cdef methods. Patch by Josh Tobin. (Github issue :issue:`2967`) * Support slice handling in newer Pythran versions. Patch by Serge Guelton. (Github issue :issue:`2989`) * A reference leak in power-of-2 calculation was fixed. Patch by Sebastian Berg. (Github issue :issue:`3022`) * The search order for include files was changed. Previously it was ``include_directories``, ``Cython/Includes``, ``sys.path``. Now it is ``include_directories``, ``sys.path``, ``Cython/Includes``. This was done to allow third-party ``*.pxd`` files to override the ones in Cython. Original patch by Matti Picus. (Github issue :issue:`2905`) * Setting ``language_level=2`` in a file did not work if ``language_level=3`` was enabled globally before. Patch by Jeroen Demeyer. (Github issue :issue:`2791`) ``` ### 0.29.10 ``` ==================== Bugs fixed ---------- * Fix compile errors in CPython 3.8b1 due to the new "tp_vectorcall" slots. (Github issue :issue:`2976`) ``` ### 0.29.9 ``` =================== Bugs fixed ---------- * Fix a crash regression in 0.29.8 when creating code objects fails. * Remove an incorrect cast when using true-division in C++ operations. (Github issue :issue:`1950`) ``` ### 0.29.8 ``` =================== Bugs fixed ---------- * C compile errors with CPython 3.8 were resolved. Patch by Marcel Plch. (Github issue :issue:`2938`) * Python tuple constants that compare equal but have different item types could incorrectly be merged into a single constant. (Github issue :issue:`2919`) * Non-ASCII characters in unprefixed strings could crash the compiler when used with language level ``3str``. * Starred expressions in %-formatting tuples could fail to compile for unicode strings. (Github issue :issue:`2939`) * Passing Python class references through ``cython.inline()`` was broken. (Github issue :issue:`2936`) ``` ### 0.29.7 ``` =================== Bugs fixed ---------- * Crash when the shared Cython config module gets unloaded and another Cython module reports an exceptions. Cython now makes sure it keeps an owned reference to the module. (Github issue :issue:`2885`) * Resolved a C89 compilation problem when enabling the fast-gil sharing feature. * Coverage reporting did not include the signature line of ``cdef`` functions. (Github issue :issue:`1461`) * Casting a GIL-requiring function into a nogil function now issues a warning. (Github issue :issue:`2879`) * Generators and coroutines were missing their return type annotation. (Github issue :issue:`2884`) ``` ### 0.29.6 ``` =================== Bugs fixed ---------- * Fix a crash when accessing the ``__kwdefaults__`` special attribute of fused functions. (Github issue :issue:`1470`) * Fix the parsing of buffer format strings that contain numeric sizes, which could lead to incorrect input rejections. (Github issue :issue:`2845`) * Avoid a C pragma in old gcc versions that was only added in GCC 4.6. Patch by Michael Anselmi. (Github issue :issue:`2838`) * Auto-encoding of Unicode strings to UTF-8 C/C++ strings failed in Python 3, even though the default encoding there is UTF-8. (Github issue :issue:`2819`) ``` ### 0.29.5 ``` =================== Bugs fixed ---------- * Crash when defining a Python subclass of an extension type and repeatedly calling a cpdef method on it. (Github issue :issue:`2823`) * Compiler crash when ``prange()`` loops appear inside of with-statements. (Github issue :issue:`2780`) * Some C compiler warnings were resolved. Patches by Christoph Gohlke. (Github issues :issue:`2815`, :issue:`2816`, :issue:`2817`, :issue:`2822`) * Python conversion of C++ enums failed in 0.29. Patch by Orivej Desh. (Github issue :issue:`2767`) ``` ### 0.29.4 ``` =================== Bugs fixed ---------- * Division of numeric constants by a runtime value of 0 could fail to raise a ``ZeroDivisionError``. (Github issue :issue:`2820`) ``` ### 0.29.3 ``` =================== Bugs fixed ---------- * Some C code for memoryviews was generated in a non-deterministic order. Patch by Martijn van Steenbergen. (Github issue :issue:`2779`) * C89 compatibility was accidentally lost since 0.28. Patches by gastineau and true-pasky. (Github issues :issue:`2778`, :issue:`2801`) * A C compiler cast warning was resolved. Patch by Michael Buesch. (Github issue :issue:`2774`) * An compilation failure with complex numbers under MSVC++ was resolved. (Github issue :issue:`2797`) * Coverage reporting could fail when modules were moved around after the build. Patch by Wenjun Si. (Github issue :issue:`2776`) ``` ### 0.29.2 ``` =================== Bugs fixed ---------- * The code generated for deduplicated constants leaked some references. (Github issue :issue:`2750`) * The declaration of ``sigismember()`` in ``libc.signal`` was corrected. (Github issue :issue:`2756`) * Crashes in compiler and test runner were fixed. (Github issue :issue:`2736`, :issue:`2755`) * A C compiler warning about an invalid safety check was resolved. (Github issue :issue:`2731`) ``` ### 0.29.1 ``` =================== Bugs fixed ---------- * Extensions compiled with MinGW-64 under Windows could misinterpret integer objects larger than 15 bit and return incorrect results. (Github issue :issue:`2670`) * Cython no longer requires the source to be writable when copying its data into a memory view slice. Patch by Andrey Paramonov. (Github issue :issue:`2644`) * Line tracing of ``try``-statements generated invalid C code. (Github issue :issue:`2274`) * When using the ``warn.undeclared`` directive, Cython's own code generated warnings that are now fixed. Patch by Nicolas Pauss. (Github issue :issue:`2685`) * Cython's memoryviews no longer require strides for setting the shape field but only the ``PyBUF_ND`` flag to be set. Patch by John Kirkham. (Github issue :issue:`2716`) * Some C compiler warnings about unused memoryview code were fixed. Patch by Ho Cheuk Ting. (Github issue :issue:`2588`) * A C compiler warning about implicit signed/unsigned conversion was fixed. (Github issue :issue:`2729`) * Assignments to C++ references returned by ``operator[]`` could fail to compile. (Github issue :issue:`2671`) * The power operator and the support for NumPy math functions were fixed in Pythran expressions. Patch by Serge Guelton. (Github issues :issue:`2702`, :issue:`2709`) * Signatures with memory view arguments now show the expected type when embedded in docstrings. Patch by Matthew Chan and Benjamin Weigel. (Github issue :issue:`2634`) * Some ``from ... cimport ...`` constructs were not correctly considered when searching modified dependencies in ``cythonize()`` to decide whether to recompile a module. Patch by Kryštof Pilnáček. (Github issue :issue:`2638`) * A struct field type in the ``cpython.array`` declarations was corrected. Patch by John Kirkham. (Github issue :issue:`2712`) ``` ### 0.29 ``` ================= Features added -------------- * PEP-489 multi-phase module initialisation has been enabled again. Module reloads in other subinterpreters raise an exception to prevent corruption of the static module state. * A set of ``mypy`` compatible PEP-484 declarations were added for Cython's C data types to integrate with static analysers in typed Python code. They are available in the ``Cython/Shadow.pyi`` module and describe the types in the special ``cython`` module that can be used for typing in Python code. Original patch by Julian Gethmann. (Github issue :issue:`1965`) * Memoryviews are supported in PEP-484/526 style type declarations. (Github issue :issue:`2529`) * ``cython.nogil`` is supported as a C-function decorator in Python code. (Github issue :issue:`2557`) * Raising exceptions from nogil code will automatically acquire the GIL, instead of requiring an explicit ``with gil`` block. * C++ functions can now be declared as potentially raising both C++ and Python exceptions, so that Cython can handle both correctly. (Github issue :issue:`2615`) * ``cython.inline()`` supports a direct ``language_level`` keyword argument that was previously only available via a directive. * A new language level name ``3str`` was added that mostly corresponds to language level 3, but keeps unprefixed string literals as type 'str' in both Py2 and Py3, and the builtin 'str' type unchanged. This will become the default in the next Cython release and is meant to help user code a) transition more easily to this new default and b) migrate to Python 3 source code semantics without making support for Python 2.x difficult. * In CPython 3.6 and later, looking up globals in the module dict is almost as fast as looking up C globals. (Github issue :issue:`2313`) * For a Python subclass of an extension type, repeated method calls to non-overridden cpdef methods can avoid the attribute lookup in Py3.6+, which makes them 4x faster. (Github issue :issue:`2313`) * (In-)equality comparisons of objects to integer literals are faster. (Github issue :issue:`2188`) * Some internal and 1-argument method calls are faster. * Modules that cimport many external extension types from other Cython modules execute less import requests during module initialisation. * Constant tuples and slices are deduplicated and only created once per module. (Github issue :issue:`2292`) * The coverage plugin considers more C file extensions such as ``.cc`` and ``.cxx``. (Github issue :issue:`2266`) * The ``cythonize`` command accepts compile time variable values (as set by ``DEF``) through the new ``-E`` option. Patch by Jerome Kieffer. (Github issue :issue:`2315`) * ``pyximport`` can import from namespace packages. Patch by Prakhar Goel. (Github issue :issue:`2294`) * Some missing numpy and CPython C-API declarations were added. Patch by John Kirkham. (Github issues :issue:`2523`, :issue:`2520`, :issue:`2537`) * Declarations for the ``pylifecycle`` C-API functions were added in a new .pxd file ``cpython.pylifecycle``. * The Pythran support was updated to work with the latest Pythran 0.8.7. Original patch by Adrien Guinet. (Github issue :issue:`2600`) * ``%a`` is included in the string formatting types that are optimised into f-strings. In this case, it is also automatically mapped to ``%r`` in Python 2.x. * New C macro ``CYTHON_HEX_VERSION`` to access Cython's version in the same style as ``PY_VERSION_HEX``. * Constants in ``libc.math`` are now declared as ``const`` to simplify their handling. * An additional ``check_size`` clause was added to the ``ctypedef class`` name specification to allow suppressing warnings when importing modules with backwards-compatible ``PyTypeObject`` size changes. Patch by Matti Picus. (Github issue :issue:`2627`) Bugs fixed ---------- * The exception handling in generators and coroutines under CPython 3.7 was adapted to the newly introduced exception stack. Users of Cython 0.28 who want to support Python 3.7 are encouraged to upgrade to 0.29 to avoid potentially incorrect error reporting and tracebacks. (Github issue :issue:`1958`) * Crash when importing a module under Stackless Python that was built for CPython. Patch by Anselm Kruis. (Github issue :issue:`2534`) * 2-value slicing of typed sequences failed if the start or stop index was None. Patch by Christian Gibson. (Github issue :issue:`2508`) * Multiplied string literals lost their factor when they are part of another constant expression (e.g. 'x' * 10 + 'y' => 'xy'). * String formatting with the '%' operator didn't call the special ``__rmod__()`` method if the right side is a string subclass that implements it. (Python issue 28598) * The directive ``language_level=3`` did not apply to the first token in the source file. (Github issue :issue:`2230`) * Overriding cpdef methods did not work in Python subclasses with slots. Note that this can have a performance impact on calls from Cython code. (Github issue :issue:`1771`) * Fix declarations of builtin or C types using strings in pure python mode. (Github issue :issue:`2046`) * Generator expressions and lambdas failed to compile in ``cfunc`` functions. (Github issue :issue:`459`) * Global names with ``const`` types were not excluded from star-import assignments which could lead to invalid C code. (Github issue :issue:`2621`) * Several internal function signatures were fixed that lead to warnings in gcc-8. (Github issue :issue:`2363`) * The numpy helper functions ``set_array_base()`` and ``get_array_base()`` were adapted to the current numpy C-API recommendations. Patch by Matti Picus. (Github issue :issue:`2528`) * Some NumPy related code was updated to avoid deprecated API usage. Original patch by jbrockmendel. (Github issue :issue:`2559`) * Several C++ STL declarations were extended and corrected. Patch by Valentin Valls. (Github issue :issue:`2207`) * C lines of the module init function were unconditionally not reported in exception stack traces. Patch by Jeroen Demeyer. (Github issue :issue:`2492`) * When PEP-489 support is enabled, reloading the module overwrote any static module state. It now raises an exception instead, given that reloading is not actually supported. * Object-returning, C++ exception throwing functions were not checking that the return value was non-null. Original patch by Matt Wozniski (Github issue :issue:`2603`) * The source file encoding detection could get confused if the ``c_string_encoding`` directive appeared within the first two lines. (Github issue :issue:`2632`) * Cython generated modules no longer emit a warning during import when the size of the NumPy array type is larger than what was found at compile time. Instead, this is assumed to be a backwards compatible change on NumPy side. Other changes ------------- * Cython now emits a warning when no ``language_level`` (2, 3 or '3str') is set explicitly, neither as a ``cythonize()`` option nor as a compiler directive. This is meant to prepare the transition of the default language level from currently Py2 to Py3, since that is what most new users will expect these days. The future default will, however, not enforce unicode literals, because this has proven a major obstacle in the support for both Python 2.x and 3.x. The next major release is intended to make this change, so that it will parse all code that does not request a specific language level as Python 3 code, but with ``str`` literals. The language level 2 will continue to be supported for an indefinite time. * The documentation was restructured, cleaned up and examples are now tested. The NumPy tutorial was also rewritten to simplify the running example. Contributed by Gabriel de Marmiesse. (Github issue :issue:`2245`) * Cython compiles less of its own modules at build time to reduce the installed package size to about half of its previous size. This makes the compiler slightly slower, by about 5-7%. ``` ### 0.28.6 ``` =================== Bugs fixed ---------- * Extensions compiled with MinGW-64 under Windows could misinterpret integer objects larger than 15 bit and return incorrect results. (Github issue :issue:`2670`) * Multiplied string literals lost their factor when they are part of another constant expression (e.g. 'x' * 10 + 'y' => 'xy'). ``` ### 0.28.5 ``` =================== Bugs fixed ---------- * The discouraged usage of GCC's attribute ``optimize("Os")`` was replaced by the similar attribute ``cold`` to reduce the code impact of the module init functions. (Github issue :issue:`2494`) * A reference leak in Py2.x was fixed when comparing str to unicode for equality. ``` ### 0.28.4 ``` =================== Bugs fixed ---------- * Reallowing ``tp_clear()`` in a subtype of an ``no_gc_clear`` extension type generated an invalid C function call to the (non-existent) base type implementation. (Github issue :issue:`2309`) * Exception catching based on a non-literal (runtime) tuple could fail to match the exception. (Github issue :issue:`2425`) * Compile fix for CPython 3.7.0a2. (Github issue :issue:`2477`) ``` ### 0.28.3 ``` =================== Bugs fixed ---------- * Set iteration was broken in non-CPython since 0.28. * ``UnicodeEncodeError`` in Py2 when ``%s`` formatting is optimised for unicode strings. (Github issue :issue:`2276`) * Work around a crash bug in g++ 4.4.x by disabling the size reduction setting of the module init function in this version. (Github issue :issue:`2235`) * Crash when exceptions occur early during module initialisation. (Github issue :issue:`2199`) ``` ### 0.28.2 ``` =================== Features added -------------- * ``abs()`` is faster for Python long objects. * The C++11 methods ``front()`` and ``end()`` were added to the declaration of ``libcpp.string``. Patch by Alex Huszagh. (Github issue :issue:`2123`) * The C++11 methods ``reserve()`` and ``bucket_count()`` are declared for ``libcpp.unordered_map``. Patch by Valentin Valls. (Github issue :issue:`2168`) Bugs fixed ---------- * The copy of a read-only memoryview was considered read-only as well, whereas a common reason to copy a read-only view is to make it writable. The result of the copying is now a writable buffer by default. (Github issue :issue:`2134`) * The ``switch`` statement generation failed to apply recursively to the body of converted if-statements. * ``NULL`` was sometimes rejected as exception return value when the returned type is a fused pointer type. Patch by Callie LeFave. (Github issue :issue:`2177`) * Fixed compatibility with PyPy 5.11. Patch by Matti Picus. (Github issue :issue:`2165`) Other changes ------------- * The NumPy tutorial was rewritten to use memoryviews instead of the older buffer declaration syntax. Contributed by Gabriel de Marmiesse. (Github issue :issue:`2162`) ``` ### 0.28.1 ``` =================== Bugs fixed ---------- * ``PyFrozenSet_New()`` was accidentally used in PyPy where it is missing from the C-API. * Assignment between some C++ templated types were incorrectly rejected when the templates mix ``const`` with ``ctypedef``. (Github issue :issue:`2148`) * Undeclared C++ no-args constructors in subclasses could make the compilation fail if the base class constructor was declared without ``nogil``. (Github issue :issue:`2157`) * Bytes %-formatting inferred ``basestring`` (bytes or unicode) as result type in some cases where ``bytes`` would have been safe to infer. (Github issue :issue:`2153`) * ``None`` was accidentally disallowed as typed return value of ``dict.pop()``. (Github issue :issue:`2152`) ``` ### 0.28 ``` ================= Features added -------------- * Cdef classes can now multiply inherit from ordinary Python classes. (The primary base must still be a c class, possibly ``object``, and the other bases must *not* be cdef classes.) * Type inference is now supported for Pythran compiled NumPy expressions. Patch by Nils Braun. (Github issue :issue:`1954`) * The ``const`` modifier can be applied to memoryview declarations to allow read-only buffers as input. (Github issues :issue:`1605`, :issue:`1869`) * C code in the docstring of a ``cdef extern`` block is copied verbatimly into the generated file. Patch by Jeroen Demeyer. (Github issue :issue:`1915`) * When compiling with gcc, the module init function is now tuned for small code size instead of whatever compile flags were provided externally. Cython now also disables some code intensive optimisations in that function to further reduce the code size. (Github issue :issue:`2102`) * Decorating an async coroutine with ``cython.iterable_coroutine`` changes its type at compile time to make it iterable. While this is not strictly in line with PEP-492, it improves the interoperability with old-style coroutines that use ``yield from`` instead of ``await``. * The IPython magic has preliminary support for JupyterLab. (Github issue :issue:`1775`) * The new TSS C-API in CPython 3.7 is supported and has been backported. Patch by Naotoshi Seo. (Github issue :issue:`1932`) * Cython knows the new ``Py_tss_t`` type defined in PEP-539 and automatically initialises variables declared with that type to ``Py_tss_NEEDS_INIT``, a value which cannot be used outside of static assignments. * The set methods ``.remove()`` and ``.discard()`` are optimised. Patch by Antoine Pitrou. (Github issue :issue:`2042`) * ``dict.pop()`` is optimised. Original patch by Antoine Pitrou. (Github issue :issue:`2047`) * Iteration over sets and frozensets is optimised. (Github issue :issue:`2048`) * Safe integer loops (< range(2^30)) are automatically optimised into C loops. * ``alist.extend([a,b,c])`` is optimised into sequential ``list.append()`` calls for short literal sequences. * Calls to builtin methods that are not specifically optimised into C-API calls now use a cache that avoids repeated lookups of the underlying C function. (Github issue :issue:`2054`) * Single argument function calls can avoid the argument tuple creation in some cases. * Some redundant extension type checks are avoided. * Formatting C enum values in f-strings is faster, as well as some other special cases. * String formatting with the '%' operator is optimised into f-strings in simple cases. * Subscripting (item access) is faster in some cases. * Some ``bytearray`` operations have been optimised similar to ``bytes``. * Some PEP-484/526 container type declarations are now considered for loop optimisations. * Indexing into memoryview slices with ``view[i][j]`` is now optimised into ``view[i, j]``. * Python compatible ``cython.*`` types can now be mixed with type declarations in Cython syntax. * Name lookups in the module and in classes are faster. * Python attribute lookups on extension types without instance dict are faster. * Some missing signals were added to ``libc/signal.pxd``. Patch by Jeroen Demeyer. (Github issue :issue:`1914`) * The warning about repeated extern declarations is now visible by default. (Github issue :issue:`1874`) * The exception handling of the function types used by CPython's type slot functions was corrected to match the de-facto standard behaviour, so that code that uses them directly benefits from automatic and correct exception propagation. Patch by Jeroen Demeyer. (Github issue :issue:`1980`) * Defining the macro ``CYTHON_NO_PYINIT_EXPORT`` will prevent the module init function from being exported as symbol, e.g. when linking modules statically in an embedding setup. Patch by AraHaan. (Github issue :issue:`1944`) Bugs fixed ---------- * If a module name is explicitly provided for an ``Extension()`` that is compiled via ``cythonize()``, it was previously ignored and replaced by the source file name. It can now be used to override the target module name, e.g. for compiling prefixed accelerator modules from Python files. (Github issue :issue:`2038`) * The arguments of the ``num_threads`` parameter of parallel sections were not sufficiently validated and could lead to invalid C code. (Github issue :issue:`1957`) * Catching exceptions with a non-trivial exception pattern could call into CPython with a live exception set. This triggered incorrect behaviour and crashes, especially in CPython 3.7. * The signature of the special ``__richcmp__()`` method was corrected to recognise the type of the first argument as ``self``. It was previously treated as plain object, but CPython actually guarantees that it always has the correct type. Note: this can change the semantics of user code that previously relied on ``self`` being untyped. * Some Python 3 exceptions were not recognised as builtins when running Cython under Python 2. * Some async helper functions were not defined in the generated C code when compiling simple async code. (Github issue :issue:`2075`) * Line tracing did not include generators and coroutines. (Github issue :issue:`1949`) * C++ declarations for ``unordered_map`` were corrected. Patch by Michael Schatzow. (Github issue :issue:`1484`) * Iterator declarations in C++ ``deque`` and ``vector`` were corrected. Patch by Alex Huszagh. (Github issue :issue:`1870`) * The const modifiers in the C++ ``string`` declarations were corrected, together with the coercion behaviour of string literals into C++ strings. (Github issue :issue:`2132`) * Some declaration types in ``libc.limits`` were corrected. Patch by Jeroen Demeyer. (Github issue :issue:`2016`) * ``cython.final`` was not accepted on Python classes with an ``cython.cclass`` decorator. (Github issue :issue:`2040`) * Cython no longer creates useless and incorrect ``PyInstanceMethod`` wrappers for methods in Python 3. Patch by Jeroen Demeyer. (Github issue :issue:`2105`) * The builtin ``bytearray`` type could not be used as base type of cdef classes. (Github issue :issue:`2106`) Other changes ------------- ``` ### 0.27.3 ``` =================== Bugs fixed ---------- * String forward references to extension types like ``cython.locals(x="ExtType")`` failed to find the named type. (Github issue :issue:`1962`) * NumPy slicing generated incorrect results when compiled with Pythran. Original patch by Serge Guelton (Github issue :issue:`1946`). * Fix "undefined reference" linker error for generators on Windows in Py3.3-3.5. (Github issue :issue:`1968`) * Adapt to recent C-API change of ``PyThreadState`` in CPython 3.7. * Fix signature of ``PyWeakref_GetObject()`` API declaration. Patch by Jeroen Demeyer (Github issue :issue:`1975`). ``` ### 0.27.2 ``` =================== Bugs fixed ---------- * Comprehensions could incorrectly be optimised away when they appeared in boolean test contexts. (Github issue :issue:`1920`) * The special methods ``__eq__``, ``__lt__`` etc. in extension types did not type their first argument as the type of the class but ``object``. (Github issue :issue:`1935`) * Crash on first lookup of "cline_in_traceback" option during exception handling. (Github issue :issue:`1907`) * Some nested module level comprehensions failed to compile. (Github issue :issue:`1906`) * Compiler crash on some complex type declarations in pure mode. (Github issue :issue:`1908`) * ``std::unordered_map.erase()`` was declared with an incorrect ``void`` return type in ``libcpp.unordered_map``. (Github issue :issue:`1484`) * Invalid use of C++ ``fallthrough`` attribute before C++11 and similar issue in clang. (Github issue :issue:`1930`) * Compiler crash on misnamed properties. (Github issue :issue:`1905`) ``` ### 0.27.1 ``` =================== Features added -------------- * The Jupyter magic has a new debug option ``--verbose`` that shows details about the distutils invocation. Patch by Boris Filippov (Github issue :issue:`1881`). Bugs fixed ---------- * Py3 list comprehensions in class bodies resulted in invalid C code. (Github issue :issue:`1889`) * Modules built for later CPython 3.5.x versions failed to import in 3.5.0/3.5.1. (Github issue :issue:`1880`) * Deallocating fused types functions and methods kept their GC tracking enabled, which could potentially lead to recursive deallocation attempts. * Crash when compiling in C++ mode with old setuptools versions. (Github issue :issue:`1879`) * C++ object arguments for the constructor of Cython implemented C++ are now passed by reference and not by value to allow for non-copyable arguments, such as ``unique_ptr``. * API-exported C++ classes with Python object members failed to compile. (Github issue :issue:`1866`) * Some issues with the new relaxed exception value handling were resolved. * Python classes as annotation types could prevent compilation. (Github issue :issue:`1887`) * Cython annotation types in Python files could lead to import failures with a "cython undefined" error. Recognised types are now turned into strings. * Coverage analysis could fail to report on extension modules on some platforms. * Annotations could be parsed (and rejected) as types even with ``annotation_typing=False``. Other changes ------------- * PEP 489 support has been disabled by default to counter incompatibilities with import setups that try to reload or reinitialise modules. ``` ### 0.27 ``` ================= Features added -------------- * Extension module initialisation follows `PEP 489 <https://www.python.org/dev/peps/pep-0489/>`_ in CPython 3.5+, which resolves several differences with regard to normal Python modules. This makes the global names ``__file__`` and ``__path__`` correctly available to module level code and improves the support for module-level relative imports. (Github issues :issue:`1715`, :issue:`1753`, :issue:`1035`) * Asynchronous generators (`PEP 525 <https://www.python.org/dev/peps/pep-0525/>`_) and asynchronous comprehensions (`PEP 530 <https://www.python.org/dev/peps/pep-0530/>`_) have been implemented. Note that async generators require finalisation support in order to allow for asynchronous operations during cleanup, which is only available in CPython 3.6+. All other functionality has been backported as usual. * Variable annotations are now parsed according to `PEP 526 <https://www.python.org/dev/peps/pep-0526/>`_. Cython types (e.g. ``cython.int``) are evaluated as C type declarations and everything else as Python types. This can be disabled with the directive ``annotation_typing=False``. Note that most complex PEP-484 style annotations are currently ignored. This will change in future releases. (Github issue :issue:`1850`) * Extension types (also in pure Python mode) can implement the normal special methods ``__eq__``, ``__lt__`` etc. for comparisons instead of the low-level ``__richcmp__`` method. (Github issue :issue:`690`) * New decorator ``cython.exceptval(x=None, check=False)`` that makes the signature declarations ``except x``, ``except? x`` and ``except *`` available to pure Python code. Original patch by Antonio Cuni. (Github issue :issue:`1653`) * Signature annotations are now included in the signature docstring generated by the ``embedsignature`` directive. Patch by Lisandro Dalcin (Github issue :issue:`1781`). * The gdb support for Python code (``libpython.py``) was updated to the latest version in CPython 3.7 (git rev 5fe59f8). * The compiler tries to find a usable exception return value for cdef functions with ``except *`` if the returned type allows it. Note that this feature is subject to safety limitations, so it is still better to provide an explicit declaration. * C functions can be assigned to function pointers with a compatible exception declaration, not only with exact matches. A side-effect is that certain compatible signature overrides are now allowed and some more mismatches of exception signatures are now detected and rejected as errors that were not detected before. * The IPython/Jupyter magic integration has a new option ``%%cython --pgo`` for profile guided optimisation. It compiles the cell with PGO settings for the C compiler, executes it to generate a runtime profile, and then compiles it again using that profile for C compiler optimisation. Currently only tested with gcc. * ``len(memoryview)`` can be used in nogil sections to get the size of the first dimension of a memory view (``shape[0]``). (Github issue :issue:`1733`) * C++ classes can now contain (properly refcounted) Python objects. * NumPy dtype subarrays are now accessible through the C-API. Patch by Gerald Dalley (Github issue :issue:`245`). * Resolves several issues with PyPy and uses faster async slots in PyPy3. Patch by Ronan Lamy (Github issues :issue:`1871`, :issue:`1878`). Bugs fixed ---------- * Extension types that were cimported from other Cython modules could disagree about the order of fused cdef methods in their call table. This could lead to wrong methods being called and potentially also crashes. The fix required changes to the ordering of fused methods in the call table, which may break existing compiled modules that call fused cdef methods across module boundaries, if these methods were implemented in a different order than they were declared in the corresponding .pxd file. (Github issue :issue:`1873`) * The exception state handling in generators and coroutines could lead to exceptions in the caller being lost if an exception was raised and handled inside of the coroutine when yielding. (Github issue :issue:`1731`) * Loops over ``range(enum)`` were not converted into C for-loops. Note that it is still recommended to use an explicit cast to a C integer type in this case. * Error positions of names (e.g. variables) were incorrectly reported after the name and not at the beginning of the name. * Compile time ``DEF`` assignments were evaluated even when they occur inside of falsy ``IF`` blocks. (Github issue :issue:`1796`) * Disabling the line tracing from a trace function could fail. Original patch by Dmitry Trofimov. (Github issue :issue:`1769`) * Several issues with the Pythran integration were resolved. * abs(signed int) now returns a signed rather than unsigned int. (Github issue :issue:`1837`) * Reading ``frame.f_locals`` of a Cython function (e.g. from a debugger or profiler could modify the module globals. (Github issue :issue:`1836`) * Buffer type mismatches in the NumPy buffer support could leak a reference to the buffer owner. * Using the "is_f_contig" and "is_c_contig" memoryview methods together could leave one of them undeclared. (Github issue :issue:`1872`) * Compilation failed if the for-in-range loop target was not a variable but a more complex expression, e.g. an item assignment. (Github issue :issue:`1831`) * Compile time evaluations of (partially) constant f-strings could show incorrect results. * Escape sequences in raw f-strings (``fr'...'``) were resolved instead of passing them through as expected. * Some ref-counting issues in buffer error handling have been resolved. Other changes ------------- * Type declarations in signature annotations are now parsed according to `PEP 484 <https://www.python.org/dev/peps/pep-0484/>`_ typing. Only Cython types (e.g. ``cython.int``) and Python builtin types are currently considered as type declarations. Everything else is ignored, but this will change in a future Cython release. (Github issue :issue:`1672`) * The directive ``annotation_typing`` is now ``True`` by default, which enables parsing type declarations from annotations. * This release no longer supports Python 3.2. ``` ### 0.26.1 ``` =================== Features added -------------- Bugs fixed ---------- * ``cython.view.array`` was missing ``.__len__()``. * Extension types with a ``.pxd`` override for their ``__releasebuffer__`` slot (e.g. as provided by Cython for the Python ``array.array`` type) could leak a reference to the buffer owner on release, thus not freeing the memory. (Github issue :issue:`1638`) * Auto-decoding failed in 0.26 for strings inside of C++ containers. (Github issue :issue:`1790`) * Compile error when inheriting from C++ container types. (Github issue :issue:`1788`) * Invalid C code in generators (declaration after code). (Github issue :issue:`1801`) * Arithmetic operations on ``const`` integer variables could generate invalid code. (Github issue :issue:`1798`) * Local variables with names of special Python methods failed to compile inside of closures. (Github issue :issue:`1797`) * Problem with indirect Emacs buffers in cython-mode. Patch by Martin Albrecht (Github issue :issue:`1743`). * Extension types named ``result`` or ``PickleError`` generated invalid unpickling code. Patch by Jason Madden (Github issue :issue:`1786`). * Bazel integration failed to compile ``.py`` files. Patch by Guro Bokum (Github issue :issue:`1784`). * Some include directories and dependencies were referenced with their absolute paths in the generated files despite lying within the project directory. * Failure to compile in Py3.7 due to a modified signature of ``_PyCFunctionFast()`` ``` ### 0.26 ``` ================= Features added -------------- * Pythran can be used as a backend for evaluating NumPy array expressions. Patch by Adrien Guinet (Github issue :issue:`1607`). * cdef classes now support pickling by default when possible. This can b