Update pyo3 requirement from 0.26 to 0.27

[dependabot]

Updates the requirements on pyo3 to permit the latest version.

Release notes

Sourced from pyo3's releases.

PyO3 0.27.0

This release is the first PyO3 release to be tested against Python 3.14.0 final. There are no significant changes to 3.14 support since PyO3 0.26 which was tested against the 3.14 release candidates.

Support for PyPy 3.9 and PyPy 3.10 (both no longer supported upstream) has been dropped.

The FromPyObject trait has been reworked in a similar fashion to the IntoPyObject trait introduced in PyO3 0.23. This has established a performant and flexible implementation of both these traits and no further changes to the traits are anticipated in the future. Thank you for the patience upgrading through these incremental improvements at the core of PyO3.

The .downcast() family of functions are now deprecated in favour of the .cast() family of functions, which are an incremental improvement to API usability and to error messages on failed conversions.

Operations on the PyCapsule type have been changed without deprecation to fix some issues with lifetimes of return values (in .name() and .reference() specifically). The capsule API now also encourages checking of capsule names, which is one of the few defences available to protect the validity of casting data read by the capsule API.

There are also many other incremental improvements, bug fixes and smaller features.

Please consult the migration guide for help upgrading.

Thank you to everyone who contributed code, documentation, design ideas, bug reports, and feedback. The following contributors' commits are included in this release:

@​alex @​altendky @​bazaah @​bschoenmaeckers @​crepererum @​davidhewitt @​dependabot[bot] @​elbaro @​Icxolu @​jqnatividad @​mbrobbel @​NilsIrl @​rvben @​sanders41 @​tdyas @​Tpt @​vvsagar

Changelog

Sourced from pyo3's changelog.

[0.27.0] - 2025-10-19

Packaging

• Extend range of supported versions of hashbrown optional dependency to include version 0.16. #5428
• Bump optional num-bigint dependency minimum version to 0.4.4. #5471
• Test against Python 3.14 final release. #5499
• Drop support for PyPy 3.9 and 3.10. #5516
• Provide a better error message when building an outdated PyO3 for a too-new Python version. #5519

Added

• Add FromPyObjectOwned as convenient trait bound for FromPyObject when the data is not borrowed from Python. #4390
• Add Borrowed::extract, same as PyAnyMethods::extract, but does not restrict the lifetime by deref. #4390
• experimental-inspect: basic support for #[derive(IntoPyObject)] (no struct fields support yet). #5365
• experimental-inspect: support #[pyo3(get, set)] and #[pyclass(get_all, set_all)]. #5370
• Add PyTypeCheck::classinfo_object that returns an object that can be used as parameter in isinstance or issubclass. #5387
• Implement PyTypeInfo on datetime.* types even when the limited API is enabled. #5388
• Implement PyTypeInfo on PyIterator, PyMapping and PySequence. #5402
• Implement PyTypeInfo on PyCode when using the stable ABI. #5403
• Implement PyTypeInfo on PyWeakrefReference when using the stable ABI. #5404
• Add pyo3::sync::RwLockExt trait, analogous to pyo3::sync::MutexExt for readwrite locks. #5435
• Add PyString::from_bytes. #5437
• Implement AsRef<[u8]> for PyBytes. #5445
• Add CastError and CastIntoError. #5468
• Add PyCapsuleMethods::pointer_checked and PyCapsuleMethods::is_valid_checked. #5474
• Add Borrowed::cast, Borrowed::cast_exact and Borrowed::cast_unchecked. #5475
• Add conversions for jiff::civil::ISOWeekDate. #5478
• Add conversions for &Cstr, Cstring and Cow<Cstr>. #5482
• add #[pyclass(skip_from_py_object)] option, to opt-out of the FromPyObject: PyClass + Clone blanket impl. #5488
• Add PyErr::add_note. #5489
• Add FromPyObject impl for Cow<Path> & Cow<OsStr>. #5497
• Add #[pyclass(from_py_object)] pyclass option, to opt-in to the extraction of pyclasses by value (requires Clone). #5506

Changed

• Rework FromPyObject trait for flexibility and performance: #4390
  • Add a second lifetime to FromPyObject, to allow borrowing data from Python objects (e.g. &str from Python str).
  • Replace extract_bound with extract, which takes Borrowed<'a, 'py, PyAny>.
• Optimize FromPyObject implementations for Vec<u8> and [u8; N] from bytes and bytearray. #5244
• Deprecate #[pyfn] attribute. #5384
• Fetch type name dynamically on cast errors instead of using PyTypeCheck::NAME. #5387
• Deprecate PyTypeCheck::NAME in favour of PyTypeCheck::classinfo_object which provides the type information at runtime. #5387
• PyClassGuard(Mut) and PyRef(Mut) extraction now returns an opaque Rust error #5413
• Fetch type name dynamically when exporting types implementing PyTypeInfo with #[pymodule_use]. #5414
• Improve Debug representation of PyBuffer<T>. #5442
• experimental-inspect: change the way introspection data is emitted in the binaries to avoid a pointer indirection and simplify parsing. #5450
• Optimize Py<T>::drop for the case when attached to the Python interpreter. #5454
• Replace DowncastError and DowncastIntoError with CastError and CastIntoError. #5468
• Enable fast-path for 128-bit integer conversions on GraalPy. #5471

... (truncated)

Commits

• 7525512 release: 0.27.0 (#5520)
• b392013 ci: install lychee stable using install-action (#5528)
• f32ed83 fix PyPyModule_ExecDef, PyPyModule_FromDefAndSpec2 definitions (#5529)
• 02b54eb make warning name distinct in warnings tests (#5532)
• 999ee8a ci: enable more tests on 3.14t (#5524)
• 8f669e7 attempt to improve unsupported Python version error (#5519)
• 012e095 remove ptr_from_ref helpers (#5523)
• f9e14fc Use per-file-ignores for MD041 in guide/pyclass-parameters.md (#5526)
• 6f813b9 docs: lint guide with rumdl (#5513)
• e62b7cc soundness for capsule reference and name (#5474)
• Additional commits viewable in compare view

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