Sourced from cython's releases.

3.1.1

No release notes provided.

3.1.0-1

No release notes provided.

3.1.0

No release notes provided.

3.1.0rc2

No release notes provided.

3.1.0rc1

No release notes provided.

3.1.0b1

No release notes provided.

3.1.0a1

3.1.0 alpha 1 (2024-11-08)

Features added

• Support for freethreading builds of CPython 3.13 was added. It comes with a new directive freethreading_compatible=True to mark modules as free-threading compatible (Py_mod_gil). https://github.com/cython/cython/issues?q=label%3A"nogil+CPython" Patches by Lysandros Nikolaou and Nathan Goldbaum. (Github issue :issue:6162)

• Support for monitoring Cython modules via sys.monitoring in CPython 3.13+ was added. For coverage reporting, this needs to be disabled with -DCYTHON_USE_SYS_MONITORING=0 as long as coverage.py does not support sys.monitoring for coverage plugins. (Github issue :issue:6144)

• Many issues with the Limited C-API were resolved. It is now sufficient to define the macro Py_LIMITED_API to activate the support. https://github.com/cython/cython/issues?q=label%3A%22limited+api%22

• Support for GraalPython was improved (but is still incomplete).

• Several issues with the gdb support were resolved. Patches by Kent Slaney. (Github issues :issue:5955, :issue:5948)

• typing.Union[SomeType, None] and SomeType | None are now understood and mean the same as typing.Optional[SomeType], allowing None in type checks. (Github issue :issue:6254)

• cython.const[] and cython.volatile[] are now available as type modifiers in Python code.

... (truncated)

Sourced from cython's changelog.

3.1.1 (2025-05-19)

Bugs fixed

• A reference leak in the async delegation code was fixed. (Github issues :issue:6850, :issue:6878)

• Conditional if-else expressions mixing Python and C (numeric) types could end up inferring an overly tight result type, thus leading to unexpected type conversions, runtime exceptions on assignment, or incorrect "temporary assignment" compile errors. (Github issue :issue:6854)

• Some Limited API issues were resolved. (Github issue :issue:6862)

• Large C long long values could be truncated when passed into PyPy. (Github issue :issue:6890)

• callable() incorrectly reported False in PyPy for classes with metaclasses. Patch by Anatolii Aniskovych. (Github issue :issue:6892)

• The signature of fused functions was no longer introspectable in Cython 3.1.0. (Github issue :issue:6855)

• Coroutines could generate invalid C with line tracing enabled. (Github issue :issue:6865)

• Code using complex() could generate invalid C code missing type declarations. (Github issue :issue:6860)

• Code using e.g. list[int | None] outside of variable/argument annotations failed to compile. (Github issue :issue:6856)

• Code using ctuples in a const context could generate invalid C. (Github issue :issue:6864)

• Accessing special methods on cpdef enums failed to compile.

• Some C compiler warnings were resolved. Patches by Daniel Larraz. (Github issues :issue:6876, :issue:3172, :issue:6873, :issue:6877)

• Re-establish support for PyPy 3.8. (Github issue :issue:6867)

3.1.0 (2025-05-08)

... (truncated)

• aeadbbe Prepare release of Cython 3.1.1.
• 9532c33 Update changelog.
• e7baa59 Use PyCallable_Check() instead of type slots for callable() in PyPy (GH-6894)
• 279377d Fix race in dict getter (GH-6849)
• 987891e Update changelog.
• edac547 Avoid calling "PyLong_FromUnsignedLongLong()" in PyPy.
• 8e107e9 Document CYTHON_USE_SYS_MONITORING (GH-6886)
• 56ab917 CI: Fix PyPy3.8 build (GH-6889)
• 0ab0e32 Update trace/profile test config for Py3.12, which at least partially works.
• c4adc2d CI: Also disable "twine" usage on "Py*t-dev" versions.
• Additional commits viewable in compare view

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