PyO3 0.9.1

Fixed

• Error messages for #[pyclass]. #826
• FromPyObject implementation for PySequence. #827

PyO3 0.9.0

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

PyO3 0.9.0 alpha.1

PyO3 0.9.0 Alpha.1

There are some breaking changes...
But I believe in most cases, you just change this

impl MyClass {
    #[new] 
    fn new(init: &PyRawObject) { 
        init.init(MyClass {});
    }
}

to

impl MyClass {
    #[new]
    fn new() -> Self { 
        MyClass {}
    }
}

and everything works fine.

Please read the guide for detail.

CHANGELOG

Changed

• 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.
• 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.
• #[new] does not take PyRawObject and can reutrn Self #683
• Use parking_lot::Mutex instead of spin::Mutex #734

Added

• Implemented IntoIterator for PySet and PyFrozenSet. #716
• PyClass, PyClassShell, PyObjectLayout, PyClassInitializer #683

Fixed

• Clear error indicator when the exception is handled on the Rust side. #719
• Fixed unsoundness of subclassing. #683.

Removed

• PyRef, PyRefMut, PyRawObject #683

PyO3 0.8.5

Added

• Support for #[name = "foo"] attribute for #[pyfunction] and in #[pymethods]. #692
• Implemented FromPyObject for HashMap and BTreeMap

PyO3 0.8.4

Added

• Support for #[text_signature] attribute. #675

PyO3 0.8.3

[0.8.3]

Fixed

• Now all &Py~ types have !Send bound. #655
• Fix a compile error raised by the stabilization of ! type. #672.

Removed

• #[init] is removed. #658

PyO3 0.8.2

Added

• FFI compatibility for PEP 590 Vectorcall. #641

Fixed

• Fix PySequenceProtocol::set_item. #624
• Fix a corner case of BigInt::FromPyObject. #630
• Fix index errors in parameter conversion. #631
• Fix handling of invalid utf-8 sequences in PyString::as_bytes. #639
  and PyString::to_string_lossy #642.
• Remove __contains__ and __iter__ from PyMappingProtocol. #644
• Fix proc-macro definition of PySetAttrProtocol. #645

PyO3 0.8.1

NOTE Please take care that PyO3 <= 0.8.0 doesn't support the latest nightly (See #614 for detail).

Added

• Conversion between num-bigint and Python int. #608

Fixed

• Make sure the right Python interpreter is used in OSX builds. #604
• Patch specialization being broken by Rust 1.40. #614
• Fix a segfault around PyErr. #597

PyO3 0.8.0

Added

• module argument to pyclass macro. #499
• py_run! macro #512
• Use existing fields and methods before calling custom getattr. #505
• PyBytes can now be indexed just like Vec<u8>
• Implement IntoPy<PyObject> for PyRef and PyRefMut.

Removed

• IntoPyObject was replaced with IntoPy<PyObject>
• #[pyclass(subclass)] is hidden a unsound-subclass feature because it's causing segmentation faults.

Fixed

• More readable error message for generics in pyclass #503

Changed

• Implementing the Using the gc parameter for pyclass (e.g. #[pyclass(gc)]) without implementing the class::PyGCProtocol trait is now a compile-time error. Failing to implement this trait could lead to segfaults. #532
• PyByteArray::data has been replaced with PyDataArray::to_vec because returning a &[u8] is unsound. (See this comment for a great write-up for why that was unsound)
• Replace mashup with paste.
• GILPool gained a Python marker to prevent it from being misused to release Python objects without the GIL held.

PyO3 0.7.0

Added

• PyPy support by omerbenamram in #393
• Have PyModule generate an index of its members (__all__ list).
• Allow slf: PyRef<T> for pyclass(#419)
• Allow to use lifetime specifiers in pymethods
• Add marshal module. #460

Changed

• Python::run returns PyResult<()> instead of PyResult<&PyAny>.
• Methods decorated with #[getter] and #[setter] can now omit wrapping the
  result type in PyResult if they don't raise exceptions.

Fixed

• type_object::PyTypeObject has been marked unsafe because breaking the contract type_object::PyTypeObject::init_type can lead to UB.
• Fixed automatic derive of PySequenceProtocol implementation in #423.
• Capitalization & better wording to README.md.
• Docstrings of properties is now properly set using the doc of the #[getter] method.
• Fixed issues with pymethods crashing on doc comments containing double quotes.
• PySet::new and PyFrozenSet::new now return PyResult<&Py[Frozen]Set>; exceptions are raised if
  the items are not hashable.
• Fixed building using venv on Windows.
• PyTuple::new now returns &PyTuple instead of Py<PyTuple>.