Sourced from pyo3's releases.

PyO3 0.21.1

This release is a set of touch-ups to PyO3 0.21 to fix cases found as adoption of PyO3 0.21.0 progressed.

The new PyBackedStr and PyBackedBytes types have had a large range of standard traits implemented, including Clone, PartialEq, Hash, PartialOrd, Display, Debug, Send and Sync.

The argument to a #[setter] function now accepts the full range of input types as any other function argument in a #[pymethods] block, and will now correctly handle a #[pyo3(from_py_with = "...")] annotation.

Some procedural macro output has been adjusted to reuse more code and make it easier to reach complete code coverage in projects using PyO3. The import_exception_bound! macro has been added to further assist with coverage during migration, by skipping generating code which is only needed to use the exception as a GIL Ref.

Finally, the experimental-async feature now correctly handles async fn in #[pymethods] which have a &self or &mut self receiver plus additional arguments.

Thank you to the following users for the improvements:

@​alex @​davidhewitt @​geo7 @​Icxolu @​reswqa @​rikushoney @​tisonkun

Sourced from pyo3's changelog.

[0.21.1] - 2024-04-01

Added

• Implement Send and Sync for PyBackedStr and PyBackedBytes. #4007
• Implement Clone, Debug, PartialEq, Eq, PartialOrd, Ord and Hash implementation for PyBackedBytes and PyBackedStr, and Display for PyBackedStr. #4020
• Add import_exception_bound! macro to import exception types without generating GIL Ref functionality for them. #4027

Changed

• Emit deprecation warning for uses of GIL Refs as #[setter] function arguments. #3998
• Add #[inline] hints on many Bound and Borrowed methods. #4024

Fixed

• Handle #[pyo3(from_py_with = "")] in #[setter] methods #3995
• Allow extraction of &Bound in #[setter] methods. #3998
• Fix some uncovered code blocks emitted by #[pymodule], #[pyfunction] and #[pyclass] macros. #4009
• Fix typo in the panic message when a class referenced in pyo3::import_exception! does not exist. #4012
• Fix compile error when using an async #[pymethod] with a receiver and additional arguments. #4015

[0.21.0] - 2024-03-25

Added

• Add support for GraalPy (24.0 and up). #3247
• Add PyMemoryView type. #3514
• Allow async fn in for #[pyfunction] and #[pymethods], with the experimental-async feature. #3540 #3588 #3599 #3931
• Implement PyTypeInfo for PyEllipsis, PyNone and PyNotImplemented. #3577
• Support #[pyclass] on enums that have non-unit variants. #3582
• Support chrono feature with abi3 feature. #3664
• FromPyObject, IntoPy<PyObject> and ToPyObject are implemented on std::duration::Duration #3670
• Add PyString::to_cow. Add Py<PyString>::to_str, Py<PyString>::to_cow, and Py<PyString>::to_string_lossy, as ways to access Python string data safely beyond the GIL lifetime. #3677
• Add Bound<T> and Borrowed<T> smart pointers as a new API for accessing Python objects. #3686
• Add PyNativeType::as_borrowed to convert "GIL refs" to the new Bound smart pointer. #3692
• Add FromPyObject::extract_bound method, to migrate FromPyObject implementations to the Bound API. #3706
• Add gil-refs feature to allow continued use of the deprecated GIL Refs APIs. #3707
• Add methods to PyAnyMethods for binary operators (add, sub, etc.) #3712
• Add chrono-tz feature allowing conversion between chrono_tz::Tz and zoneinfo.ZoneInfo #3730
• Add FFI definition PyType_GetModuleByDef. #3734
• Conversion between std::time::SystemTime and datetime.datetime #3736
• Add Py::as_any and Py::into_any. #3785
• Add PyStringMethods::encode_utf8. #3801
• Add PyBackedStr and PyBackedBytes, as alternatives to &str and &bytes where a Python object owns the data. #3802 #3991
• Allow #[pymodule] macro on Rust mod blocks, with the experimental-declarative-modules feature. #3815
• Implement ExactSizeIterator for set and frozenset iterators on abi3 feature. #3849
• Add Py::drop_ref to explicitly drop a `Py`` and immediately decrease the Python reference count if the GIL is already held. #3871
• Allow #[pymodule] macro on single argument functions that take &Bound<'_, PyModule>. #3905
• Implement FromPyObject for Cow<str>. #3928

... (truncated)

• 4168d05 release: 0.21.1
• 8cabd26 docs: updates to guide for PyO3 0.21 feedback (#4031)
• 8f87b86 refactor #[setter] argument extraction (#4002)
• 63ba371 added various std traits for PyBackedStr and PyBackedBytes (#4020)
• 336b1c9 add import_exception_bound! macro (#4027)
• 3af9a1f docs: fix example in types.md (#4028)
• cff4aa3 ci: defer test-debug to the merge queue (#4023)
• 9d932c1 add #[inline] hints on many Bound and Borrowed methods (#4024)
• 22e8dd1 add benchmark for class / method calls (#4016)
• 74d9d23 async method should allow args not only receiver (#4015)
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