PyO3/pyo3 v0.9.0

PyO3 0.9.0

on GitHub

This is a big release and there are some breaking changes.
Please check the migration guide.

Thank you @ijl @birkenfeld @Alexander-N @davidhewitt @konstin @c410-f3r @oconnor663 @andrewwhitehead @synapticarbors @bmatthieu3 @Hywan @paddywwoof @gilescope for contributing!
And thank you all bug reporters and reviewers, though it's difficult to list them here.

Changed

• #[new] does not take PyRawObject and can return Self. #683
• The blanket implementations for FromPyObject for &T and &mut T are no longer specializable. Implement PyTryFrom for your type to control the behavior of FromPyObject::extract() for your types. #713
• The implementation for IntoPy<U> for T where U: FromPy<T> is no longer specializable. Control the behavior of this via the implementation of FromPy. #713
• Use parking_lot::Mutex instead of spin::Mutex. #734
• Bumped minimum Rust version to 1.42.0-nightly 2020-01-21. #761
• PyRef and PyRefMut are renewed for PyCell. #770
• Some new FFI functions for Python 3.8. #784
• PyAny is now on the top level module and prelude. #816

Added

• PyCell, which has RefCell-like features. #770
• PyClass, PyLayout, PyClassInitializer. #683
• Implemented IntoIterator for PySet and PyFrozenSet. #716
• FromPyObject is now automatically implemented for T: Clone pyclasses. #730
• #[pyo3(get)] and #[pyo3(set)] will now use the Rust doc-comment from the field for the Python property. #755
• #[setter] functions may now take an argument of Pyo3::Python. #760
• PyTypeInfo::BaseLayout and PyClass::BaseNativeType. #770
• PyDowncastImpl. #770
• Implement FromPyObject and IntoPy<PyObject> traits for arrays (up to 32). #778
• migration.md and types.md in the guide. #795, #802
• ffi::{_PyBytes_Resize, _PyDict_Next, _PyDict_Contains, _PyDict_GetDictPtr}. #820

Fixed

• Fixed unsoundness of subclassing. #683.
• Clear error indicator when the exception is handled on the Rust side. #719
• Usage of raw identifiers with #[pyo3(set)]. #745
• Usage of PyObject with #[pyo3(get)]. #760
• #[pymethods] used in conjunction with #[cfg]. #769
• "*" in a #[pyfunction()] argument list incorrectly accepting any number of positional arguments (use args = "*" when this behaviour is desired). #792
• PyModule::dict. #809
• Fix the case where DESCRIPTION is not null-terminated. #822

Removed

• PyRawObject. #683
• PyNoArgsFunction. #741
• initialize_type(). To set the module name for a #[pyclass], use the module argument to the macro. #751
• AsPyRef::as_mut/with/with_mut/into_py/into_mut_py. #770
• PyTryFrom::try_from_mut/try_from_mut_exact/try_from_mut_unchecked. #770
• Python::mut_from_owned_ptr/mut_from_borrowed_ptr. #770
• ObjectProtocol::get_base/get_mut_base. #770