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

• 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)
• Additional commits viewable in compare view

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