Metadata-Version: 2.4
Name: Cython
Version: 3.2.5
Summary: The Cython compiler for writing C extensions in the Python language.
Home-page: https://cython.org/
Author: Robert Bradshaw, Stefan Behnel, David Woods, Greg Ewing, et al.
Author-email: cython-devel@python.org
License: Apache-2.0
Project-URL: Documentation, https://cython.readthedocs.io/
Project-URL: Donate, https://cython.readthedocs.io/en/latest/src/donating.html
Project-URL: Source Code, https://github.com/cython/cython
Project-URL: Bug Tracker, https://github.com/cython/cython/issues/
Project-URL: User Group, https://groups.google.com/g/cython-users
Classifier: Development Status :: 5 - Production/Stable
Classifier: Intended Audience :: Developers
Classifier: Operating System :: OS Independent
Classifier: Programming Language :: Python
Classifier: Programming Language :: Python :: 3
Classifier: Programming Language :: Python :: 3.8
Classifier: Programming Language :: Python :: 3.9
Classifier: Programming Language :: Python :: 3.10
Classifier: Programming Language :: Python :: 3.11
Classifier: Programming Language :: Python :: 3.12
Classifier: Programming Language :: Python :: 3.13
Classifier: Programming Language :: Python :: 3.14
Classifier: Programming Language :: Python :: Implementation :: CPython
Classifier: Programming Language :: Python :: Implementation :: PyPy
Classifier: Programming Language :: Python :: Implementation :: Stackless
Classifier: Programming Language :: C
Classifier: Programming Language :: C++
Classifier: Programming Language :: Cython
Classifier: Topic :: Software Development :: Code Generators
Classifier: Topic :: Software Development :: Compilers
Classifier: Topic :: Software Development :: Libraries :: Python Modules
Classifier: Typing :: Typed
Requires-Python: >=3.8
Description-Content-Type: text/x-rst
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Dynamic: author-email
Dynamic: classifier
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The Cython language makes writing C extensions for the Python language as
easy as Python itself.  Cython is a source code translator based on Pyrex_,
but supports more cutting edge functionality and optimizations.

The Cython language is a superset of the Python language (almost all Python
code is also valid Cython code), but Cython additionally supports optional
static typing to natively call C functions, operate with C++ classes and
declare fast C types on variables and class attributes.  This allows the
compiler to generate very efficient C code from Cython code.

This makes Cython the ideal language for writing glue code for external
C/C++ libraries, and for fast C modules that speed up the execution of
Python code.

The newest Cython release can always be downloaded from https://cython.org/.
Unpack the tarball or zip file, enter the directory, and then run::

    pip install .

Note that for one-time builds, e.g. for CI/testing, on platforms that are not
covered by one of the wheel packages provided on PyPI *and* the pure Python wheel
that we provide is not used, it is substantially faster than a full source build
to install an uncompiled (slower) version of Cython with::

    NO_CYTHON_COMPILE=true pip install .

.. _Pyrex: https://www.cosc.canterbury.ac.nz/greg.ewing/python/Pyrex/

3.2.5 (2026-05-23)
==================

Bugs fixed
----------

* A compile failure was fixed when using the walrus operator inside of try-except.
  (Github issue https://github.com/cython/cython/issues/7462)

* Expressions with side-effects as object argument to ``isinstance()`` could get
  evaluated multiple times, e.g. when they use the walrus operator.
  (Github issue https://github.com/cython/cython/issues/7670)

* Several problems generating the shared utility module were resolved, including
  a performance regression with memory views.
  (Github issues https://github.com/cython/cython/issues/7487, https://github.com/cython/cython/issues/7497, https://github.com/cython/cython/issues/7504, https://github.com/cython/cython/issues/7558)

* Some GC and refcounting issues were resolved for Cython functions in the Limited API.
  (Github issue https://github.com/cython/cython/issues/7594)

* Refcounting errors and error handling issues were resolved in some rare error handling cases.
  (Github issues https://github.com/cython/cython/issues/7597, https://github.com/cython/cython/issues/7599, https://github.com/cython/cython/issues/7612, https://github.com/cython/cython/issues/7673)

* Using ``cython.pymutex`` in an extension type with ``cdef`` methods generated
  invalid C code missing the required ``PyMutex`` declarations.
  (Github issue https://github.com/cython/cython/issues/6995)

* Calling ``.get_frame()`` on Cython coroutines could crash in freethreading Python.
  (Github issue https://github.com/cython/cython/issues/7632)

* The vectorcall protocol was not used correctly in ``.throw()`` of Cython coroutines
  when raising the exception only by type (without value or traceback).
  (Github issue https://github.com/cython/cython/issues/7677)

* A problem with cpdef enums in the Limited API of Python 3.11+ was resolved.
  (Github issue https://github.com/cython/cython/issues/7503)

* Unicode predicates like ``.isdigit()`` are now allowed to fail in the Limited API.
  (Github issue https://github.com/cython/cython/issues/7602)

* Conditional expressions mixing Python float and int object types could accidentally
  infer float as the common result type, instead of treating both independently.

* Using ``sizeof()`` in the size declarations of ``extern`` arrays failed.
  (Github issue https://github.com/cython/cython/issues/7451)

* Enabling profiling generated invalid C code for non-Python return tuples.
  (Github issue https://github.com/cython/cython/issues/7580)

* ``abs()`` on C ``long long`` values could generate invalid C code.

* When the ``CYTHON_AVOID_BORROWED_REFS`` C macro is enabled, e.g. in GraalPython,
  dict iteration could fail to compile.
  Patch by Michael Šimáček.  (Github issue https://github.com/cython/cython/issues/7631)

* A C compiler warning about unused functions was resolved.
  (Github issue https://github.com/cython/cython/issues/7560)

* The ``py_safe_call_once()`` C++ mutex helper function in ``libcpp.mutex``
  failed to compile.
  (Github issue https://github.com/cython/cython/issues/7585)

* The ``cpython.array`` declarations were adapted for Python 3.15.  Direct access
  to the C struct of the ``array.array`` data type might require user code changes.
  (Github issue https://github.com/cython/cython/issues/7659)

* Spaces in file paths written to the ``depfile`` were not escaped.
  Patch by Loïc Estève.  (Github issue https://github.com/cython/cython/issues/7423)

* Cython's cache failed to restore multi-file results.
  (Github issue https://github.com/cython/cython/issues/7559)

* Using Tempita from its command line failed with a name error.
  (Github issue https://github.com/cython/cython/issues/7567)

Other changes
-------------

* The known builtin types were updated for Py3.15.
