Sourced from cython's releases.

3.2.1

No release notes provided.

3.2.0 (2025-11-05)

(Complete changelog for the 3.2.0 release, including pre-releases.)

Features added

• Builtin exception types are now inferred. (Github issue :issue:6908)

• The list of known, inferred and optimised Python builtins was updated. range is now considered a type. ascii, bin, format, hex, oct were added as functions. (Github issue :issue:6931)

• The f-string syntax was extended according to PEP-701. (Github issue :issue:5452)

• t-strings are implemented according to PEP-750. The implementation backports the template classes but prefers existing backports if installed separately. (Github issue :issue:6811)

• Unknown return type annotations with -> are no longer rejected but produce warnings. This allows better integration with Python type hints that are not always usable for Cython. -> None is also allowed now. Patch by jpe. (Github issue :issue:6946)

• The runtime Python dispatch for fused functions is substantially faster. (Github issues :issue:1385, :issue:6996)

• Freelists (via cdef class decorator and for internally used types such as async) are now also used in the Limited API and with extension type specs enabled. (Github issue :issue:7151)

• Module imports now quickly check for an already imported module to speed up reimports. Patch by Lysandros Nikolaou. (Github issue :issue:7035)

• Type checks on PEP-604 union types (int | None) are optimised into separate checks. (Github issue :issue:6935)

• Assignments to the PEP-604 union type float | None allow any suitable Python number as input and convert it to a Python float automatically. (Github issue :issue:5750)

• Item type inference was improved for looping over literals. (Github issue :issue:6912)

... (truncated)

Sourced from cython's changelog.

3.2.1 (2025-11-12)

Features added

• Cython now leaves markers about its utility code dependencies in the generated C code to help debugging "unused function" C compiler warnings. (Github issue :issue:7294)

Bugs fixed

• Relative imports could fail if the shared utility module is used. This bug was introduced in Cython 3.2.0. (Github issue :issue:7290)

• Under lock congestion, acquiring the GIL could crash in Python 3.11. This bug was introduced in Cython 3.2.0. (Github issue :issue:7312)

• Using the shared utility module left an unused C function in user modules with memoryviews. To make debugging this kind of issue easier, Cython now leaves "used by …" markers in the generated C files that indicate why a specific piece of utility code was included. This bug was introduced in Cython 3.2.0. (Github issue :issue:7293)

• Code using the pre-import scope failed with an undefined name. This bug was introduced in Cython 3.2.0. (Github issue :issue:7304)

• Includes all fixes as of Cython 3.1.7.

3.2.0 (2025-11-05)

(Complete changelog for the 3.2.0 release, including pre-releases.)

Features added

• Builtin exception types are now inferred. (Github issue :issue:6908)

• The list of known, inferred and optimised Python builtins was updated. range is now considered a type. ascii, bin, format, hex, oct were added as functions. (Github issue :issue:6931)

• The f-string syntax was extended according to PEP-701.

... (truncated)

• 91685b6 Prepare release of Cython 3.2.1.
• aff6117 Update changelog.
• 2ee6756 Merge branch '3.1.x' into 3.2.x
• 9be46dc Update changelog.
• 6ab9444 Fix version hex in thread state save (#7313)
• 0a69663 Merge branch '3.1.x' into 3.2.x
• 44e0951 Prepare release of Cython 3.1.7.
• 0d78f72 Update changelog.
• bc041bf Fix crash when assigning nested structs from a list of structs (GH-7309)
• 62ba6b5 Update changelog.
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