This release contains a couple of bugfixes to resolve complation issues with 0.12.0 on specific targets. Thank you to @alex and @mtreinish for the bug reports and subsequent patches.

Fixed

• Fix building for a 32-bit Python on 64-bit Windows with a 64-bit Rust toolchain. #1179
• Fix building on platforms where c_char is u8. #1182

This release includes a few careful revisions to the PyO3 API with the intention to make it easier to learn and use. The PyErr type is reworked to implement std::error::Error. The FromPy trait is removed. Finally, the PyObject struct is now just a type alias to Py<PyAny>. While we do not take pleasure in making breaking changes for users' code, we have done so with careful thought to make migration as simple as possible while also allowing the PyO3 API to mature. Please see the migration guide for help upgrading if any of these changes affect you.

Also added is a new #[derive(FromPyObject)] macro, which enables a convenient way to accept arguments of the Python "type" Union. (See the guide entry on this new feature.)

There have been many other improvements and bugfixes too numerous to go into detail here. For the full list, see the CHANGELOG.

Thank you to everyone who contributed code, documentation fixes, design ideas, bug reports, and feedback on the way to PyO3 0.12. The full list of users who commited at least one contribution to PyO3 0.12 is below:

@alex
@birkenfeld
@cathay4t
@davidhewitt
@Hakuyume
@Hywan
@kngwyu
@konstin
@marioortizmanero
@MoritzLangenstein
@mtreinish
@mvaled
@nagisa
@noam93k
@Progdrasil
@programmerjake
@rob-thatcher
@sebpuetz
@vorner
@vthriller

#[pyclass(unsendable)] is added, please check the guide!

[0.11.1] - 2020-06-30

Added

• #[pyclass(unsendable)]. #1009

Changed

• Update parking_lot dependency to 0.11. #1010

This is our first version that supports the stable Rust toolchain. The minimum required version is 1.39.0.
Thank you @davidhewitt @scalexm @tamuhey @konstin @Nateckert @Alexander-N @m-ou-se and all issue reporters 🙂

Maybe the most influential change is now #[pyclass] requires Send. Please see the migration guide for more.

Added

• Support stable versions of Rust (>=1.39). #969
• Add FFI definition PyObject_AsFileDescriptor. #938
• Add PyByteArray::data, PyByteArray::as_bytes, and PyByteArray::as_bytes_mut. #967
• Add GILOnceCell to use in situations where lazy_static or once_cell can deadlock. #975
• Add Py::borrow, Py::borrow_mut, Py::try_borrow, and Py::try_borrow_mut for accessing #[pyclass] values. #976
• Add IterNextOutput and IterANextOutput for returning from __next__ / __anext__. #997

Changed

• Simplify internals of #[pyo3(get)] attribute. (Remove the hidden API GetPropertyValue.) #934
• Call Py_Finalize at exit to flush buffers, etc. #943
• Add type parameter to PyBuffer. #951
• Require Send bound for #[pyclass]. #966
• Add Python argument to most methods on PyObject and Py<T> to ensure GIL safety. #970
• Change signature of PyTypeObject::type_object() - now takes Python argument and returns &PyType. #970
• Change return type of PyTuple::slice() and PyTuple::split_from() from Py<PyTuple> to &PyTuple. #970
• Change return type of PyTuple::as_slice to &[&PyAny]. #971
• Rename PyTypeInfo::type_object to type_object_raw, and add Python argument. #975
• Update num-complex optional dependendency from 0.2 to 0.3. #977
• Update num-bigint optional dependendency from 0.2 to 0.3. #978
• #[pyproto] is re-implemented without specialization. #961
• PyClassAlloc::alloc is renamed to PyClassAlloc::new. #990
• #[pyproto] methods can now have return value T or PyResult<T> (previously only PyResult<T> was supported). #996
• #[pyproto] methods can now skip annotating the return type if it is (). #998

Removed

• Remove ManagedPyRef (unused, and needs specialization) #930

Fixed

• Fix passing explicit None to Option<T> argument #[pyfunction] with a default value. #936
• Fix PyClass.__new__'s not respecting subclasses when inherited by a Python class. #990
• Fix returning Option<T> from #[pyproto] methods. #996
• Fix accepting PyRef<Self> and PyRefMut<Self> to #[getter] and #[setter] methods. #999

0.10.0 has a deadlock bug and was yanked. Thank you @davidhewitt for fixing it!

Fixed

• Fix deadlock in Python::acquire_gil() after dropping a PyObject or Py<T>. #924

Added

• FromPyObject implementations for HashSet and BTreeSet. #842

Fixed

• Correctly detect 32bit architecture. #830

Fixed

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

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

Added

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

Added

• Support for #[text_signature] attribute. #675

[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

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

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

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.

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>.

Regressions

• Currently, #341 causes cargo test to fail with weird linking errors when the extension-module feature is activated. For now you can work around this by making the extension-module feature optional and running the tests with cargo test --no-default-features:

[dependencies.pyo3]
version = "0.6.0"

[features]
extension-module = ["pyo3/extension-module"]
default = ["extension-module"]

Added

• Added a wrap_pymodule! macro similar to the existing wrap_pyfunction! macro. Only available on python 3
• Added support for cross compiling (e.g. to arm v7) by mtp401 in #327. See the "Cross Compiling" section in the "Building and Distribution" chapter of the guide for more details.
• The PyRef and PyRefMut types, which allow to differentiate between an instance of a rust struct on the rust heap and an instance that is embedded inside a python object. By kngwyu in #335
• Added FromPy<T> and IntoPy<T> which are equivalent to From<T> and Into<T> except that they require a gil token.
• Added ManagedPyRef, which should eventually replace ToBorrowedObject.

Changed

• Renamed PyObjectRef to PyAny in #388
• Renamed add_function to add_wrapped as it now also supports modules.
• Renamed #[pymodinit] to #[pymodule]
• py.init(|| value) becomes Py::new(value)
• py.init_ref(|| value) becomes PyRef::new(value)
• py.init_mut(|| value) becomes PyRefMut::new(value).
• PyRawObject::init is now infallible, e.g. it returns () instead of PyResult<()>.
• Renamed py_exception! to create_exception! and refactored the error macros.
• Renamed wrap_function! to wrap_pyfunction!
• Renamed #[prop(get, set)] to #[pyo3(get, set)]
• #[pyfunction] now supports the same arguments as #[pyfn()]
• Some macros now emit proper spanned errors instead of panics.
• Migrated to the 2018 edition
• crate::types::exceptions moved to crate::exceptions
• Replace IntoPyTuple with IntoPy<Py<PyTuple>>.
• IntoPyPointer and ToPyPointer moved into the crate root.
• class::CompareOp moved into class::basic::CompareOp
• PyTypeObject is now a direct subtrait PyTypeCreate, removing the old cyclical implementation in #350
• Add PyList::{sort, reverse} by chr1sj0nes in #357 and #358
• Renamed the typeob module to type_object

Removed

• PyToken was removed due to unsoundness (See #94).
• Removed the unnecessary type parameter from PyObjectAlloc
• NoArgs. Just use an empty tuple
• PyObjectWithGIL. PyNativeType is sufficient now that PyToken is removed.

Fixed

• A soudness hole where every instances of a #[pyclass] struct was considered to be part of a python object, even though you can create instances that are not part of the python heap. This was fixed through PyRef and PyRefMut.
• Fix kwargs support in #328.
• Add full support for __dict__ in #403.

Fixed

• Fix memory leak in ArrayList by kngwyu #316

Fixed

• Fix undeterministic segfaults when creating many objects by kngwyu in #281

Added

• #[pyclass] objects can now be returned from rust functions
• PyComplex by kngwyu in #226
• PyDict::from_sequence(), equivalent to dict([(key, val), ...])
• Bindings for the datetime standard library types: PyDate, PyTime, PyDateTime, PyTzInfo, PyDelta with associated ffi types, by pganssle #200.
• PyString, PyUnicode, and PyBytes now have an as_bytes() method that returns &[u8].
• PyObjectProtocol::get_type_ptr() by ijl in #242

Removed

• Removed most entries from the prelude. The new prelude is small and clear.
• Slowly removing specialization uses
• PyString, PyUnicode, and PyBytes no longer have a data() method
  (replaced by as_bytes()) and PyStringData has been removed.

Changed

• Removes the types from the root module and the prelude. They now live in pyo3::types instead.
• All exceptions are consturcted with py_err instead of new, as they return PyErr and not Self.
• as_mut and friends take and &mut self instead of &self
• ObjectProtocol::call now takes an Option<&PyDict> for the kwargs instead of an IntoPyDictPointer.
• IntoPyDictPointer was replace by IntoPyDict which doesn't convert PyDict itself anymore and returns a PyDict instead of *mut PyObject.
• PyTuple::new now takes an IntoIterator instead of a slice
• Updated to syn 0.15
• Splitted PyTypeObject into PyTypeObject without the create method and PyTypeCreate with requires PyObjectAlloc<Self> + PyTypeInfo + Sized.
• Ran cargo edition --fix which prefixed path with crate:: for rust 2018
• Renamed async to pyasync as async will be a keyword in the 2018 edition.
• Starting to use NonNull<*mut PyObject> for Py and PyObject by ijl #260

Fixed

• Added an explanation that the GIL can temporarily be released even while holding a GILGuard.
• Lots of clippy errors
• Fix segfault on calling an unknown method on a PyObject
• Work around a bug in the rust compiler by kngwyu #252
• Fixed a segfault with subclassing pyo3 create classes and using __class__ by kngwyu #263

Removed

• The pyobject_extract macro

Removed

• Conversions from tuples to PyDict due to rust-lang/rust#52050

Changed

• Merged both examples into one
• Rustfmt all the things ✔️
• Switched to Keep a Changelog

Changes

• Replaced concat_idents with mashup

Changes

• Fixed scoping bug in pyobject_native_type that would break rust-numpy

0.2.7 backports the compilation fix with current nightlies, so pyo3 stays usable until 0.3 is released.

Changes

• Fix compatibility with TryFrom trait

Changes

• CPython 3.7 support

• Embedded CPython 3.7b1 crashes on initialization #110

• Generated extension functions are weakly typed #108

• call_method*() crashes when the method does not exist #113

• Allow importing exceptions from nested modules #116

Changes

• Allow to get mutable ref from PyObject #106

• Drop RefFromPyObject trait

• Add Python::register_any() method

• Fix impl FromPyObject for Py<T>

• Mark method that work with raw pointers as unsafe #95