CHANGELOG.md

Changelog

All notable changes to this project will be documented in this file. For help with updating to new PyO3 versions, please see the migration guide.

The format is based on Keep a Changelog and this project adheres to Semantic Versioning.

To see unreleased changes, please see the CHANGELOG on the main branch guide.

0.22.2 - 2024-07-17

Packaging

• Require opt-in to freethreaded Python using the UNSAFE_PYO3_BUILD_FREE_THREADED=1 environment variable (it is not yet supported by PyO3). #4327

Changed

• Use FFI function calls for reference counting on all abi3 versions. #4324
• #[pymodule(...)] now directly accepts all relevant #[pyo3(...)] options. #4330

Fixed

• Fix compile failure in declarative #[pymodule] under presence of #![no_implicit_prelude]. #4328
• Fix compile failure due to c-string literals on Rust < 1.79. #4353

0.22.1 - 2024-07-06

Added

• Add #[pyo3(submodule)] option for declarative #[pymodule]s. #4301
• Implement PartialEq<bool> for Bound<'py, PyBool>. #4305

Fixed

• Return NotImplemented instead of raising TypeError from generated equality method when comparing different types. #4287
• Handle full-path #[pyo3::prelude::pymodule] and similar for #[pyclass] and #[pyfunction] in declarative modules.#4288
• Fix 128-bit int regression on big-endian platforms with Python <3.13. #4291
• Stop generating code that will never be covered with declarative modules. #4297
• Fix invalid deprecation warning for trailing optional on #[setter] function. #4304

0.22.0 - 2024-06-24

Packaging

• Update heck dependency to 0.5. #3966
• Extend range of supported versions of chrono-tz optional dependency to include version 0.10. #4061
• Update MSRV to 1.63. #4129
• Add optional num-rational feature to add conversions with Python's fractions.Fraction. #4148
• Support Python 3.13. #4184

Added

• Add PyWeakref, PyWeakrefReference and PyWeakrefProxy. #3835
• Support #[pyclass] on enums that have tuple variants. #4072
• Add support for scientific notation in Decimal conversion. #4079
• Add pyo3_disable_reference_pool conditional compilation flag to avoid the overhead of the global reference pool at the cost of known limitations as explained in the performance section of the guide. #4095
• Add #[pyo3(constructor = (...))] to customize the generated constructors for complex enum variants. #4158
• Add PyType::module, which always matches Python __module__. #4196
• Add PyType::fully_qualified_name which matches the "fully qualified name" defined in PEP 737. #4196
• Add PyTypeMethods::mro and PyTypeMethods::bases. #4197
• Add #[pyclass(ord)] to implement ordering based on PartialOrd. #4202
• Implement ToPyObject and IntoPy<PyObject> for PyBackedStr and PyBackedBytes. #4205
• Add #[pyclass(hash)] option to implement __hash__ in terms of the Hash implementation #4206
• Add #[pyclass(eq)] option to generate __eq__ based on PartialEq, and #[pyclass(eq_int)] for simple enums to implement equality based on their discriminants. #4210
• Implement From<Bound<'py, T>> for PyClassInitializer<T>. #4214
• Add as_super methods to PyRef and PyRefMut for accesing the base class by reference. #4219
• Implement PartialEq<str> for Bound<'py, PyString>. #4245
• Implement PyModuleMethods::filename on PyPy. #4249
• Implement PartialEq<[u8]> for Bound<'py, PyBytes>. #4250
• Add pyo3_ffi::c_str macro to create &'static CStr on Rust versions which don't have 1.77's c"" literals. #4255
• Support bool conversion with numpy 2.0's numpy.bool type #4258
• Add PyAnyMethods::{bitnot, matmul, floor_div, rem, divmod}. #4264

Changed

• Change the type of PySliceIndices::slicelength and the length parameter of PySlice::indices(). #3761
• Deprecate implicit default for trailing optional arguments #4078
• Cloneing pointers into the Python heap has been moved behind the py-clone feature, as it must panic without the GIL being held as a soundness fix. #4095
• Add #[track_caller] to all Py<T>, Bound<'py, T> and Borrowed<'a, 'py, T> methods which can panic. #4098
• Change PyAnyMethods::dir to be fallible and return PyResult<Bound<'py, PyList>> (and similar for PyAny::dir). #4100
• The global reference pool (to track pending reference count decrements) is now initialized lazily to avoid the overhead of taking a mutex upon function entry when the functionality is not actually used. #4178
• Emit error messages when using weakref or dict when compiling for abi3 for Python older than 3.9. #4194
• Change PyType::name to always match Python __name__. #4196
• Remove CPython internal ffi call for complex number including: add, sub, mul, div, neg, abs, pow. Added PyAnyMethods::{abs, pos, neg} #4201
• Deprecate implicit integer comparision for simple enums in favor of #[pyclass(eq_int)]. #4210
• Set the module= attribute of declarative modules' child #[pymodule]s and #[pyclass]es. #4213
• Set the module option for complex enum variants from the value set on the complex enum module. #4228
• Respect the Python "limited API" when building for the abi3 feature on PyPy or GraalPy. #4237
• Optimize code generated by #[pyo3(get)] on #[pyclass] fields. #4254
• PyCFunction::new, PyCFunction::new_with_keywords and PyCFunction::new_closure now take &'static CStr name and doc arguments (previously was &'static str). #4255
• The experimental-declarative-modules feature is now stabilized and available by default. #4257

Fixed

• Fix panic when PYO3_CROSS_LIB_DIR is set to a missing path. #4043
• Fix a compile error when exporting an exception created with create_exception! living in a different Rust module using the declarative-module feature. #4086
• Fix FFI definitions of PY_VECTORCALL_ARGUMENTS_OFFSET and PyVectorcall_NARGS to fix a false-positive assertion. #4104
• Disable PyUnicode_DATA on PyPy: not exposed by PyPy. #4116
• Correctly handle #[pyo3(from_py_with = ...)] attribute on dunder (__magic__) method arguments instead of silently ignoring it. #4117
• Fix a compile error when declaring a standalone function or class method with a Python name that is a Rust keyword. #4226
• Fix declarative modules discarding doc comments on the mod node. #4236
• Fix __dict__ attribute missing for #[pyclass(dict)] instances when building for abi3 on Python 3.9. #4251

0.21.2 - 2024-04-16

Changed

• Deprecate the PySet::empty() gil-ref constructor. #4082

Fixed

• Fix compile error for async fn in #[pymethods] with a &self receiver and more than one additional argument. #4035
• Improve error message for wrong receiver type in __traverse__. #4045
• Fix compile error when exporting a #[pyclass] living in a different Rust module using the experimental-declarative-modules feature. #4054
• Fix missing_docs lint triggering on documented #[pymodule] functions. #4067
• Fix undefined symbol errors for extension modules on AIX (by linking libpython). #4073

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
• Implement Default for GILOnceCell. #3971
• Add PyDictMethods::into_mapping, PyListMethods::into_sequence and PyTupleMethods::into_sequence. #3982

Changed

• PyDict::from_sequence now takes a single argument of type &PyAny (previously took two arguments Python and PyObject). #3532
• Deprecate Py::is_ellipsis and PyAny::is_ellipsis in favour of any.is(py.Ellipsis()). #3577
• Split some PyTypeInfo functionality into new traits HasPyGilRef and PyTypeCheck. #3600
• Deprecate PyTryFrom and PyTryInto traits in favor of any.downcast() via the PyTypeCheck and PyTypeInfo traits. #3601
• Allow async methods to accept &self/&mut self #3609
• FromPyObject for set types now also accept frozenset objects as input. #3632
• FromPyObject for bool now also accepts NumPy's bool_ as input. #3638
• Add AsRefSource associated type to PyNativeType. #3653
• Rename .is_true to .is_truthy on PyAny and Py<PyAny> to clarify that the test is not based on identity with or equality to the True singleton. #3657
• PyType::name is now PyType::qualname whereas PyType::name efficiently accesses the full name which includes the module name. #3660
• The Iter(A)NextOutput types are now deprecated and __(a)next__ can directly return anything which can be converted into Python objects, i.e. awaitables do not need to be wrapped into IterANextOutput or Option any more. Option can still be used as well and returning None will trigger the fast path for __next__, stopping iteration without having to raise a StopIteration exception. #3661
• Implement FromPyObject on chrono::DateTime<Tz> for all Tz, not just FixedOffset and Utc. #3663
• Add lifetime parameter to PyTzInfoAccess trait. For the deprecated gil-ref API, the trait is now implemented for &'py PyTime and &'py PyDateTime instead of PyTime and PyDate. #3679
• Calls to __traverse__ become no-ops for unsendable pyclasses if on the wrong thread, thereby avoiding hard aborts at the cost of potential leakage. #3689
• Include PyNativeType in pyo3::prelude. #3692
• Improve performance of extract::<i64> (and other integer types) by avoiding call to __index__() converting the value to an integer for 3.10+. Gives performance improvement of around 30% for successful extraction. #3742
• Relax bound of FromPyObject for Py<T> to just T: PyTypeCheck. #3776
• PySet and PyFrozenSet iterators now always iterate the equivalent of iter(set). (A "fast path" with no noticeable performance benefit was removed.) #3849
• Move implementations of FromPyObject for &str, Cow<str>, &[u8] and Cow<[u8]> onto a temporary trait FromPyObjectBound when gil-refs feature is deactivated. #3928
• Deprecate GILPool, Python::with_pool, and Python::new_pool. #3947

Removed

• Remove all functionality deprecated in PyO3 0.19. #3603

Fixed

• Match PyPy 7.3.14 in removing PyPy-only symbol Py_MAX_NDIMS in favour of PyBUF_MAX_NDIM. #3757
• Fix segmentation fault using datetime types when an invalid datetime module is on sys.path. #3818
• Fix non_local_definitions lint warning triggered by many PyO3 macros. #3901
• Disable PyCode and PyCode_Type on PyPy: PyCode_Type is not exposed by PyPy. #3934

0.21.0-beta.0 - 2024-03-10

Prerelease of PyO3 0.21. See the GitHub diff for what changed between 0.21.0-beta.0 and the final release.

0.20.3 - 2024-02-23

Packaging

• Add portable-atomic dependency. #3619
• Check maximum version of Python at build time and for versions not yet supported require opt-in to the abi3 stable ABI by the environment variable PYO3_USE_ABI3_FORWARD_COMPATIBILITY=1. #3821

Fixed

• Use portable-atomic to support platforms without 64-bit atomics. #3619
• Fix compilation failure with either feature enabled without experimental-inspect enabled. #3834

0.20.2 - 2024-01-04

Packaging

• Pin pyo3 and pyo3-ffi dependencies on pyo3-build-config to require the same patch version, i.e. pyo3 0.20.2 requires exactly pyo3-build-config 0.20.2. #3721

Fixed

• Fix compile failure when building pyo3 0.20.0 with latest pyo3-build-config 0.20.X. #3724
• Fix docs.rs build. #3722

0.20.1 - 2023-12-30

Added

• Add optional either feature to add conversions for either::Either<L, R> sum type. #3456
• Add optional smallvec feature to add conversions for smallvec::SmallVec. #3507
• Add take and into_inner methods to GILOnceCell #3556
• #[classmethod] methods can now also receive Py<PyType> as their first argument. #3587
• #[pyfunction(pass_module)] can now also receive Py<PyModule> as their first argument. #3587
• Add traverse method to GILProtected. #3616
• Added abi3-py312 feature #3687

Fixed

• Fix minimum version specification for optional chrono dependency. #3512
• Silenced new clippy::unnecessary_fallible_conversions warning when using a Py<Self> self receiver. #3564

0.20.0 - 2023-10-11

Packaging

• Dual-license PyO3 under either the Apache 2.0 OR the MIT license. This makes the project GPLv2 compatible. #3108
• Update MSRV to Rust 1.56. #3208
• Bump indoc dependency to 2.0 and unindent dependency to 0.2. #3237
• Bump syn dependency to 2.0. #3239
• Drop support for debug builds of Python 3.7. #3387
• Bump chrono optional dependency to require 0.4.25 or newer. #3427
• Support Python 3.12. #3488

Added

• Support __lt__, __le__, __eq__, __ne__, __gt__ and __ge__ in #[pymethods]. #3203
• Add FFI definition Py_GETENV. #3336
• Add as_ptr and into_ptr inherent methods for Py, PyAny, PyRef, and PyRefMut. #3359
• Implement DoubleEndedIterator for PyTupleIterator and PyListIterator. #3366
• Add #[pyclass(rename_all = "...")] option: this allows renaming all getters and setters of a struct, or all variants of an enum. Available renaming rules are: "camelCase", "kebab-case", "lowercase", "PascalCase", "SCREAMING-KEBAB-CASE", "SCREAMING_SNAKE_CASE", "snake_case", "UPPERCASE". #3384
• Add FFI definitions PyObject_GC_IsTracked and PyObject_GC_IsFinalized on Python 3.9 and up (PyPy 3.10 and up). #3403
• Add types for None, Ellipsis, and NotImplemented. #3408
• Add FFI definitions for the Py_mod_multiple_interpreters constant and its possible values. #3494
• Add FFI definitions for PyInterpreterConfig struct, its constants and Py_NewInterpreterFromConfig. #3502

Changed

• Change PySet::discard to return PyResult<bool> (previously returned nothing). #3281
• Optimize implmentation of IntoPy for Rust tuples to Python tuples. #3321
• Change PyDict::get_item to no longer suppress arbitrary exceptions (the return type is now PyResult<Option<&PyAny>> instead of Option<&PyAny>), and deprecate PyDict::get_item_with_error. #3330
• Deprecate FFI definitions which are deprecated in Python 3.12. #3336
• AsPyPointer is now an unsafe trait. #3358
• Accept all os.PathLike values in implementation of FromPyObject for PathBuf. #3374
• Add __builtins__ to globals in py.run() and py.eval() if they're missing. #3378
• Optimize implementation of FromPyObject for BigInt and BigUint. #3379
• PyIterator::from_object and PyByteArray::from now take a single argument of type &PyAny (previously took two arguments Python and AsPyPointer). #3389
• Replace AsPyPointer with AsRef<PyAny> as a bound in the blanket implementation of From<&T> for PyObject. #3391
• Replace blanket impl IntoPy<PyObject> for &T where T: AsPyPointer with implementations of impl IntoPy<PyObject> for &PyAny, &T where T: AsRef<PyAny>, and &Py<T>. #3393
• Preserve std::io::Error kind in implementation of From<std::io::IntoInnerError> for PyErr #3396
• Try to select a relevant ErrorKind in implementation of From<PyErr> for OSError subclass. #3397
• Retrieve the original PyErr in implementation of From<std::io::Error> for PyErr if the std::io::Error has been built using a Python exception (previously would create a new exception wrapping the std::io::Error). #3402
• #[pymodule] will now return the same module object on repeated import by the same Python interpreter, on Python 3.9 and up. #3446
• Truncate leap-seconds and warn when converting chrono types to Python datetime types (datetime cannot represent leap-seconds). #3458
• Err returned from #[pyfunction] will now have a non-None __context__ if called from inside a catch block. #3455
• Deprecate undocumented #[__new__] form of #[new] attribute. #3505

Removed

• Remove all functionality deprecated in PyO3 0.18, including #[args] attribute for #[pymethods]. #3232
• Remove IntoPyPointer trait in favour of into_ptr inherent methods. #3385

Fixed

• Handle exceptions properly in PySet::discard. #3281
• The PyTupleIterator type returned by PyTuple::iter is now public and hence can be named by downstream crates. #3366
• Linking of PyOS_FSPath on PyPy. #3374
• Fix memory leak in PyTypeBuilder::build. #3401
• Disable removed FFI definitions _Py_GetAllocatedBlocks, _PyObject_GC_Malloc, and _PyObject_GC_Calloc on Python 3.11 and up. #3403
• Fix ResourceWarning and crashes related to GC when running with debug builds of CPython. #3404
• Some-wrapping of Option<T> default arguments will no longer re-wrap Some(T) or expressions evaluating to None. #3461
• Fix IterNextOutput::Return not returning a value on PyPy. #3471
• Emit compile errors instead of ignoring macro invocations inside #[pymethods] blocks. #3491
• Emit error on invalid arguments to #[new], #[classmethod], #[staticmethod], and #[classattr]. #3484
• Disable PyMarshal_WriteObjectToString from PyMarshal_ReadObjectFromString with the abi3 feature. #3490
• Fix FFI definitions for _PyFrameEvalFunction on Python 3.11 and up (it now receives a _PyInterpreterFrame opaque struct). #3500

0.19.2 - 2023-08-01

Added

• Add FFI definitions PyState_AddModule, PyState_RemoveModule and PyState_FindModule for PyPy 3.9 and up. #3295
• Add FFI definitions _PyObject_CallFunction_SizeT and _PyObject_CallMethod_SizeT. #3297
• Add a "performance" section to the guide collecting performance-related tricks and problems. #3304
• Add PyErr::Display for all Python versions, and FFI symbol PyErr_DisplayException for Python 3.12. #3334
• Add FFI definition PyType_GetDict() for Python 3.12. #3339
• Add PyAny::downcast_exact. #3346
• Add PySlice::full() to construct a full slice (::). #3353

Changed

• Update PyErr for 3.12 betas to avoid deprecated ffi methods. #3306
• Update FFI definitions of object.h for Python 3.12.0b4. #3335
• Update pyo3::ffi struct definitions to be compatible with 3.12.0b4. #3342
• Optimize conversion of float to f64 (and PyFloat::value) on non-abi3 builds. #3345

Fixed

• Fix timezone conversion bug for FixedOffset datetimes that were being incorrectly converted to and from UTC. #3269
• Fix SystemError raised in PyUnicodeDecodeError_Create on PyPy 3.10. #3297
• Correct FFI definition Py_EnterRecursiveCall to return c_int (was incorrectly returning ()). #3300
• Fix case where PyErr::matches and PyErr::is_instance returned results inconsistent with PyErr::get_type. #3313
• Fix loss of panic message in PanicException when unwinding after the exception was "normalized". #3326
• Fix PyErr::from_value and PyErr::into_value losing traceback on conversion. #3328
• Fix reference counting of immortal objects on Python 3.12.0b4. #3335

0.19.1 - 2023-07-03

Packaging

• Extend range of supported versions of hashbrown optional dependency to include version 0.14 #3258
• Extend range of supported versions of indexmap optional dependency to include version 2. #3277
• Support PyPy 3.10. #3289

Added

• Add pyo3::types::PyFrozenSetBuilder to allow building a PyFrozenSet item by item. #3156
• Add support for converting to and from Python's ipaddress.IPv4Address/ipaddress.IPv6Address and std::net::IpAddr. #3197
• Add support for num-bigint feature in combination with abi3. #3198
• Add PyErr_GetRaisedException(), PyErr_SetRaisedException() to FFI definitions for Python 3.12 and later. #3248
• Add Python::with_pool which is a safer but more limited alternative to Python::new_pool. #3263
• Add PyDict::get_item_with_error on PyPy. #3270
• Allow #[new] methods may to return Py<Self> in order to return existing instances. #3287

Fixed

• Fix conversion of classes implementing __complex__ to Complex when using abi3 or PyPy. #3185
• Stop suppressing unrelated exceptions in PyAny::hasattr. #3271
• Fix memory leak when creating PySet or PyFrozenSet or returning types converted into these internally, e.g. HashSet or BTreeSet. #3286

0.19.0 - 2023-05-31

Packaging

• Correct dependency on syn to version 1.0.85 instead of the incorrect version 1.0.56. #3152

Added

• Accept text_signature option (and automatically generate signature) for #[new] in #[pymethods]. #2980
• Add support for converting to and from Python's decimal.Decimal and rust_decimal::Decimal. #3016
• Add #[pyo3(from_item_all)] when deriving FromPyObject to specify get_item as getter for all fields. #3120
• Add pyo3::exceptions::PyBaseExceptionGroup for Python 3.11, and corresponding FFI definition PyExc_BaseExceptionGroup. #3141
• Accept #[new] with #[classmethod] to create a constructor which receives a (subtype's) class/PyType as its first argument. #3157
• Add PyClass::get and Py::get for GIL-indepedent access to classes with #[pyclass(frozen)]. #3158
• Add PyAny::is_exact_instance and PyAny::is_exact_instance_of. #3161

Changed

• PyAny::is_instance_of::<T>(obj) is now equivalent to T::is_type_of(obj), and now returns bool instead of PyResult<bool>. #2881
• Deprecate text_signature option on #[pyclass] structs. #2980
• No longer wrap anyhow::Error/eyre::Report containing a basic PyErr without a chain in a PyRuntimeError. #3004
• • Change #[getter] and #[setter] to use a common call "trampoline" to slightly reduce generated code size and compile times. #3029
• Improve default values for str, numbers and bool in automatically-generated text_signature. #3050
• Improve default value for None in automatically-generated text_signature. #3066
• Rename PySequence::list and PySequence::tuple to PySequence::to_list and PySequence::to_tuple. (The old names continue to exist as deprecated forms.) #3111
• Extend the lifetime of the GIL token returned by PyRef::py and PyRefMut::py to match the underlying borrow. #3131
• Safe access to the GIL, for example via Python::with_gil, is now locked inside of implementations of the __traverse__ slot. #3168

Removed

• Remove all functionality deprecated in PyO3 0.17, most prominently Python::acquire_gil is replaced by Python::with_gil. #2981

Fixed

• Correct FFI definitions PyGetSetDef, PyMemberDef, PyStructSequence_Field and PyStructSequence_Desc to have *const c_char members for name and doc (not *mut c_char). #3036
• Fix panic on fmt::Display, instead return "<unprintable object>" string and report error via sys.unraisablehook() #3062
• Fix a compile error of "temporary value dropped while borrowed" when #[pyfunction]s take references into #[pyclass]es #3142
• Fix crashes caused by PyO3 applying deferred reference count updates when entering a __traverse__ implementation. #3168
• Forbid running the Drop implementations of unsendable classes on other threads. #3176
• Fix a compile error when #[pymethods] items come from somewhere else (for example, as a macro argument) and a custom receiver like Py<Self> is used. #3178

0.18.3 - 2023-04-13

Added

• Add GILProtected<T> to mediate concurrent access to a value using Python's global interpreter lock (GIL). #2975
• Support PyASCIIObject / PyUnicode and associated methods on big-endian architectures. #3015
• Add FFI definition _PyDict_Contains_KnownHash() for CPython 3.10 and up. #3088

Fixed

• Fix compile error for #[pymethods] and #[pyfunction] called "output". #3022
• Fix compile error in generated code for magic methods implemented as a #[staticmethod]. #3055
• Fix is_instance for PyDateTime (would incorrectly check for a PyDate). #3071
• Fix upstream deprecation of PyUnicode_InternImmortal since Python 3.10. #3071

0.18.2 - 2023-03-24

Packaging

• Disable default features of chrono to avoid depending on time v0.1.x. #2939

Added

• Implement IntoPy<PyObject>, ToPyObject and FromPyObject for Cow<[u8]> to efficiently handle both bytes and bytearray objects. #2899
• Implement IntoPy<PyObject>, ToPyObject and FromPyObject for Cell<T>. #3014
• Add PyList::to_tuple(), as a convenient and efficient conversion from lists to tuples. #3042
• Add PyTuple::to_list(), as a convenient and efficient conversion from tuples to lists. #3044

Changed

• Optimize PySequence conversion for list and tuple inputs. #2944
• Improve exception raised when creating #[pyclass] type object fails during module import. #2947
• Optimize PyMapping conversion for dict inputs. #2954
• Allow create_exception! to take a dotted.module to place the exception in a submodule. #2979

Fixed

• Fix a reference counting race condition affecting PyObjects cloned in allow_threads blocks. #2952
• Fix clippy::redundant_closure lint on default arguments in #[pyo3(signature = (...))] annotations. #2990
• Fix non_snake_case lint on generated code in #[pyfunction] macro. #2993
• Fix some FFI definitions for the upcoming PyPy 3.10 release. #3031

0.18.1 - 2023-02-07

Added

• Add PyErr::write_unraisable(). #2889
• Add Python::Ellipsis() and PyAny::is_ellipsis() methods. #2911
• Add PyDict::update() and PyDict::update_if_missing() methods. #2912

Changed

• FFI definition PyIter_Check on CPython 3.7 is now implemented as hasattr(type(obj), "__next__"), which works correctly on all platforms and adds support for abi3. #2914
• Warn about unknown config keys in PYO3_CONFIG_FILE instead of denying. #2926

Fixed

• Send errors returned by __releasebuffer__ to sys.unraisablehook rather than causing SystemError. #2886
• Fix downcast to PyIterator succeeding for Python classes which did not implement __next__. #2914
• Fix segfault in __traverse__ when visiting None fields of Option<T: AsPyPointer>. #2921
• Fix #[pymethods(crate = "...")] option being ignored. #2923
• Link against pythonXY_d.dll for debug Python builds on Windows. #2937

0.18.0 - 2023-01-17

Packaging

• Relax indexmap optional depecency to allow >= 1.6, < 2. #2849
• Relax hashbrown optional dependency to allow >= 0.9, < 0.14. #2875
• Update memoffset dependency to 0.8. #2875

Added

• Add GILOnceCell::get_or_try_init for fallible GILOnceCell initialization. #2398
• Add experimental feature experimental-inspect with type_input() and type_output() helpers to get the Python type of any Python-compatible object. #2490 #2882
• The #[pyclass] macro can now take get_all and set_all to create getters and setters for every field. #2692
• Add #[pyo3(signature = (...))] option for #[pyfunction] and #[pymethods]. #2702
• pyo3-build-config: rebuild when PYO3_ENVIRONMENT_SIGNATURE environment variable value changes. #2727
• Add conversions between non-zero int types in std::num and Python int. #2730
• Add Py::downcast() as a companion to PyAny::downcast(), as well as downcast_unchecked() for both types. #2734
• Add types for all built-in Warning classes as well as PyErr::warn_explicit. #2742
• Add abi3-py311 feature. #2776
• Add FFI definition _PyErr_ChainExceptions() for CPython. #2788
• Add FFI definitions PyVectorcall_NARGS and PY_VECTORCALL_ARGUMENTS_OFFSET for PyPy 3.8 and up. #2811
• Add PyList::get_item_unchecked for PyPy. #2827

Changed

• PyO3's macros now emit a much nicer error message if function return values don't implement the required trait(s). #2664
• Use a TypeError, rather than a ValueError, when refusing to treat a str as a Vec. #2685
• Change PyCFunction::new_closure to take name and doc arguments. #2686
• PyType::is_subclass, PyErr::is_instance and PyAny::is_instance now take &PyAny instead of &PyType arguments, so that they work with objects that pretend to be types using __subclasscheck__ and __instancecheck__. #2695
• Deprecate #[args] attribute and passing "args" specification directly to #[pyfunction] in favor of the new #[pyo3(signature = (...))] option. #2702
• Deprecate required arguments after Option<T> arguments to #[pyfunction] and #[pymethods] without also using #[pyo3(signature)] to specify whether the arguments should be required or have defaults. #2703
• Change #[pyfunction] and #[pymethods] to use a common call "trampoline" to slightly reduce generated code size and compile times. #2705
• PyAny::cast_as() and Py::cast_as() are now deprecated in favor of PyAny::downcast() and the new Py::downcast(). #2734
• Relax lifetime bounds on PyAny::downcast(). #2734
• Automatically generate __text_signature__ for all Python functions created using #[pyfunction] and #[pymethods]. #2784
• Accept any iterator in PySet::new and PyFrozenSet::new. #2795
• Mixing #[cfg(...)] and #[pyo3(...)] attributes on #[pyclass] struct fields will now work. #2796
• Re-enable PyFunction on when building for abi3 or PyPy. #2838
• Improve derive(FromPyObject) to use intern! when applicable for #[pyo3(item)]. #2879

Removed

• Remove the deprecated pyproto feature, #[pyproto] macro, and all accompanying APIs. #2587
• Remove all functionality deprecated in PyO3 0.16. #2843

Fixed

• Disable PyModule::filename on PyPy. #2715
• PyCodeObject is now once again defined with fields on Python 3.7. #2726
• Raise a TypeError if #[new] pymethods with no arguments receive arguments when called from Python. #2749
• Use the NOARGS argument calling convention for methods that have a single py: Python argument (as a performance optimization). #2760
• Fix truncation of isize values to c_long in PySlice::new. #2769
• Fix soundness issue with FFI definition PyUnicodeDecodeError_Create on PyPy leading to indeterminate behavior (typically a TypeError). #2772
• Allow functions taking **kwargs to accept keyword arguments which share a name with a positional-only argument (as permitted by PEP 570). #2800
• Fix unresolved symbol for PyObject_Vectorcall on PyPy 3.9 and up. #2811
• Fix memory leak in PyCFunction::new_closure. #2842

0.17.3 - 2022-11-01

Packaging

• Support Python 3.11. (Previous versions of PyO3 0.17 have been tested against Python 3.11 release candidates and are expected to be compatible, this is the first version tested against Python 3.11.0.) #2708

Added

• Implemented ExactSizeIterator for PyListIterator, PyDictIterator, PySetIterator and PyFrozenSetIterator. #2676

Fixed

• Fix regression of impl FromPyObject for [T; N] no longer accepting types passing PySequence_Check, e.g. NumPy arrays, since version 0.17.0. This the same fix that was applied impl FromPyObject for Vec<T> in version 0.17.1 extended to fixed-size arrays. #2675
• Fix UB in FunctionDescription::extract_arguments_fastcall due to creating slices from a null pointer. #2687

0.17.2 - 2022-10-04

Packaging

• Added optional chrono feature to convert chrono types into types in the datetime module. #2612

Added

• Add support for num-bigint feature on PyPy. #2626

Fixed

• Correctly implement __richcmp__ for enums, fixing __ne__ returning always returning True. #2622
• Fix compile error since 0.17.0 with Option<&SomePyClass> argument with a default. #2630
• Fix regression of impl FromPyObject for Vec<T> no longer accepting types passing PySequence_Check, e.g. NumPy arrays, since 0.17.0. #2631

0.17.1 - 2022-08-28

Fixed

• Fix visibility of PyDictItems, PyDictKeys, and PyDictValues types added in PyO3 0.17.0.
• Fix compile failure when using #[pyo3(from_py_with = "...")] attribute on an argument of type Option<T>. #2592
• Fix clippy redundant-closure lint on **kwargs arguments for #[pyfunction] and #[pymethods]. #2595

0.17.0 - 2022-08-23

Packaging

• Update inventory dependency to 0.3 (the multiple-pymethods feature now requires Rust 1.62 for correctness). #2492

Added

• Add timezone_utc. #1588
• Implement ToPyObject for [T; N]. #2313
• Add PyDictKeys, PyDictValues and PyDictItems Rust types. #2358
• Add append_to_inittab. #2377
• Add FFI definition PyFrame_GetCode. #2406
• Add PyCode and PyFrame high level objects. #2408
• Add FFI definitions Py_fstring_input, sendfunc, and _PyErr_StackItem. #2423
• Add PyDateTime::new_with_fold, PyTime::new_with_fold, PyTime::get_fold, and PyDateTime::get_fold for PyPy. #2428
• Add #[pyclass(frozen)]. #2448
• Accept #[pyo3(name)] on enum variants. #2457
• Add CompareOp::matches to implement __richcmp__ as the result of a Rust std::cmp::Ordering comparison. #2460
• Add PySuper type. #2486
• Support PyPy on Windows with the generate-import-lib feature. #2506
• Add FFI definitions Py_EnterRecursiveCall and Py_LeaveRecursiveCall. #2511
• Add PyDict::get_item_with_error. #2536
• Add #[pyclass(sequence)] option. #2567

Changed

• Change datetime constructors taking a tzinfo to take Option<&PyTzInfo> instead of Option<&PyObject>: PyDateTime::new, PyDateTime::new_with_fold, PyTime::new, and PyTime::new_with_fold. #1588
• Move PyTypeObject::type_object method to the PyTypeInfo trait, and deprecate the PyTypeObject trait. #2287
• Methods of Py and PyAny now accept impl IntoPy<Py<PyString>> rather than just &str to allow use of the intern! macro. #2312
• Change the deprecated pyproto feature to be opt-in instead of opt-out. #2322
• Emit better error messages when #[pyfunction] return types do not implement IntoPy. #2326
• Require T: IntoPy for impl<T, const N: usize> IntoPy<PyObject> for [T; N] instead of T: ToPyObject. #2326
• Deprecate the ToBorrowedObject trait. #2333
• Iterators over PySet and PyDict will now panic if the underlying collection is mutated during the iteration. #2380
• Iterators over PySet and PyDict will now panic if the underlying collection is mutated during the iteration. #2380
• Allow #[classattr] methods to be fallible. #2385
• Prevent multiple #[pymethods] with the same name for a single #[pyclass]. #2399
• Fixup lib_name when using PYO3_CONFIG_FILE. #2404
• Add a message to the ValueError raised by the #[derive(FromPyObject)] implementation for a tuple struct. #2414
• Allow #[classattr] methods to take Python argument. #2456
• Rework PyCapsule type to resolve soundness issues: #2485
  • PyCapsule::new and PyCapsule::new_with_destructor now take name: Option<CString> instead of &CStr.
  • The destructor F in PyCapsule::new_with_destructor must now be Send.
  • PyCapsule::get_context deprecated in favor of PyCapsule::context which doesn't take a py: Python<'_> argument.
  • PyCapsule::set_context no longer takes a py: Python<'_> argument.
  • PyCapsule::name now returns PyResult<Option<&CStr>> instead of &CStr.
• FromPyObject::extract for Vec<T> no longer accepts Python str inputs. #2500
• Ensure each #[pymodule] is only initialized once. #2523
• pyo3_build_config::add_extension_module_link_args now also emits linker arguments for wasm32-unknown-emscripten. #2538
• Type checks for PySequence and PyMapping now require inputs to inherit from (or register with) collections.abc.Sequence and collections.abc.Mapping respectively. #2477
• Disable PyFunction on when building for abi3 or PyPy. #2542
• Deprecate Python::acquire_gil. #2549

Removed

• Remove all functionality deprecated in PyO3 0.15. #2283
• Make the Dict, WeakRef and BaseNativeType members of the PyClass private implementation details. #2572

Fixed

• Enable incorrectly disabled FFI definition PyThreadState_DeleteCurrent. #2357
• Fix wrap_pymodule interactions with name resolution rules: it no longer "sees through" glob imports of use submodule::* when submodule::submodule is a #[pymodule]. #2363
• Correct FFI definition PyEval_EvalCodeEx to take *const *mut PyObject array arguments instead of *mut *mut PyObject. #2368
• Fix "raw-ident" structs (e.g. #[pyclass] struct r#RawName) incorrectly having r# at the start of the class name created in Python. #2395
• Correct FFI definition Py_tracefunc to be unsafe extern "C" fn (was previously safe). #2407
• Fix compile failure with #[pyo3(from_py_with = "...")] annotations on a field in a #[derive(FromPyObject)] struct. #2414
• Fix FFI definitions _PyDateTime_BaseTime and _PyDateTime_BaseDateTime lacking leading underscores in their names. #2421
• Remove FFI definition PyArena on Python 3.10 and up. #2421
• Fix FFI definition PyCompilerFlags missing member cf_feature_version on Python 3.8 and up. #2423
• Fix FFI definition PyAsyncMethods missing member am_send on Python 3.10 and up. #2423
• Fix FFI definition PyGenObject having multiple incorrect members on various Python versions. #2423
• Fix FFI definition PySyntaxErrorObject missing members end_lineno and end_offset on Python 3.10 and up. #2423
• Fix FFI definition PyHeapTypeObject missing member ht_module on Python 3.9 and up. #2423
• Fix FFI definition PyFrameObject having multiple incorrect members on various Python versions. #2424 #2434
• Fix FFI definition PyTypeObject missing deprecated field tp_print on Python 3.8. #2428
• Fix FFI definitions PyDateTime_CAPI. PyDateTime_Date, PyASCIIObject, PyBaseExceptionObject, PyListObject, and PyTypeObject on PyPy. #2428
• Fix FFI definition _inittab field initfunc typo'd as initfun. #2431
• Fix FFI definitions _PyDateTime_BaseTime and _PyDateTime_BaseDateTime incorrectly having fold member. #2432
• Fix FFI definitions PyTypeObject. PyHeapTypeObject, and PyCFunctionObject having incorrect members on PyPy 3.9. #2433
• Fix FFI definition PyGetSetDef to have *const c_char for doc member (not *mut c_char). #2439
• Fix #[pyo3(from_py_with = "...")] being ignored for 1-element tuple structs and transparent structs. #2440
• Use memoffset to avoid UB when computing PyCell layout. #2450
• Fix incorrect enum names being returned by the generated repr for enums renamed by #[pyclass(name = "...")] #2457
• Fix PyObject_CallNoArgs incorrectly being available when building for abi3 on Python 3.9. #2476
• Fix several clippy warnings generated by #[pyfunction] arguments. #2503

0.16.6 - 2022-08-23

Changed

• Fix soundness issues with PyCapsule type with select workarounds. Users are encourage to upgrade to PyO3 0.17 at their earliest convenience which contains API breakages which fix the issues in a long-term fashion. #2522
  • PyCapsule::new and PyCapsule::new_with_destructor now take ownership of a copy of the name to resolve a possible use-after-free.
  • PyCapsule::name now returns an empty CStr instead of dereferencing a null pointer if the capsule has no name.
  • The destructor F in PyCapsule::new_with_destructor will never be called if the capsule is deleted from a thread other than the one which the capsule was created in (a warning will be emitted).
• Panics during drop of panic payload caught by PyO3 will now abort. #2544

0.16.5 - 2022-05-15

Added

• Add an experimental generate-import-lib feature to support auto-generating non-abi3 python import libraries for Windows targets. #2364
• Add FFI definition Py_ExitStatusException. #2374

Changed

• Deprecate experimental generate-abi3-import-lib feature in favor of the new generate-import-lib feature. #2364

Fixed

• Added missing warn_default_encoding field to PyConfig on 3.10+. The previously missing field could result in incorrect behavior or crashes. #2370
• Fixed order of pathconfig_warnings and program_name fields of PyConfig on 3.10+. Previously, the order of the fields was swapped and this could lead to incorrect behavior or crashes. #2370

0.16.4 - 2022-04-14

Added

• Add PyTzInfoAccess trait for safe access to time zone information. #2263
• Add an experimental generate-abi3-import-lib feature to auto-generate python3.dll import libraries for Windows. #2282
• Add FFI definitions for PyDateTime_BaseTime and PyDateTime_BaseDateTime. #2294

Changed

• Improved performance of failing calls to FromPyObject::extract which is common when functions accept multiple distinct types. #2279
• Default to "m" ABI tag when choosing libpython link name for CPython 3.7 on Unix. #2288
• Allow to compile "abi3" extensions without a working build host Python interpreter. #2293

Fixed

• Crates depending on PyO3 can collect code coverage via LLVM instrumentation using stable Rust. #2286
• Fix segfault when calling FFI methods PyDateTime_DATE_GET_TZINFO or PyDateTime_TIME_GET_TZINFO on datetime or time without a tzinfo. #2289
• Fix directory names starting with the letter n breaking serialization of the interpreter configuration on Windows since PyO3 0.16.3. #2299

0.16.3 - 2022-04-05

Packaging

• Extend parking_lot dependency supported versions to include 0.12. #2239

Added

• Add methods to pyo3_build_config::InterpreterConfig to run Python scripts using the configured executable. #2092
• Add as_bytes method to Py<PyBytes>. #2235
• Add FFI definitions for PyType_FromModuleAndSpec, PyType_GetModule, PyType_GetModuleState and PyModule_AddType. #2250
• Add pyo3_build_config::cross_compiling_from_to as a helper to detect when PyO3 is cross-compiling. #2253
• Add #[pyclass(mapping)] option to leave sequence slots empty in container implementations. #2265
• Add PyString::intern to enable usage of the Python's built-in string interning. #2268
• Add intern! macro which can be used to amortize the cost of creating Python strings by storing them inside a GILOnceCell. #2269
• Add PYO3_CROSS_PYTHON_IMPLEMENTATION environment variable for selecting the default cross Python implementation. #2272

Changed

• Allow #[pyo3(crate = "...", text_signature = "...")] options to be used directly in #[pyclass(crate = "...", text_signature = "...")]. #2234
• Make PYO3_CROSS_LIB_DIR environment variable optional when cross compiling. #2241
• Mark METH_FASTCALL calling convention as limited API on Python 3.10. #2250
• Deprecate pyo3_build_config::cross_compiling in favor of pyo3_build_config::cross_compiling_from_to. #2253

Fixed

• Fix abi3-py310 feature: use Python 3.10 ABI when available instead of silently falling back to the 3.9 ABI. #2242
• Use shared linking mode when cross compiling against a Framework bundle for macOS. #2233
• Fix panic during compilation when PYO3_CROSS_LIB_DIR is set for some host/target combinations. #2232
• Correct dependency version for syn to require minimal patch version 1.0.56. #2240

0.16.2 - 2022-03-15

Packaging

• Warn when modules are imported on PyPy 3.7 versions older than PyPy 7.3.8, as they are known to have binary compatibility issues. #2217
• Ensure build script of pyo3-ffi runs before that of pyo3 to fix cross compilation. #2224

0.16.1 - 2022-03-05

Packaging

• Extend hashbrown optional dependency supported versions to include 0.12. #2197

Fixed

• Fix incorrect platform detection for Windows in pyo3-build-config. #2198
• Fix regression from 0.16 preventing cross compiling to aarch64 macOS. #2201

0.16.0 - 2022-02-27

Packaging

• Update MSRV to Rust 1.48. #2004
• Update indoc optional dependency to 1.0. #2004
• Drop support for Python 3.6, remove abi3-py36 feature. #2006
• pyo3-build-config no longer enables the resolve-config feature by default. #2008
• Update inventory optional dependency to 0.2. #2019
• Drop paste dependency. #2081
• The bindings found in pyo3::ffi are now a re-export of a separate pyo3-ffi crate. #2126
• Support PyPy 3.9. #2143

Added

• Add PyCapsule type exposing the Capsule API. #1980
• Add pyo3_build_config::Sysconfigdata and supporting APIs. #1996
• Add Py::setattr method. #2009
• Add #[pyo3(crate = "some::path")] option to all attribute macros (except the deprecated #[pyproto]). #2022
• Enable create_exception! macro to take an optional docstring. #2027
• Enable #[pyclass] for fieldless (aka C-like) enums. #2034
• Add buffer magic methods __getbuffer__ and __releasebuffer__ to #[pymethods]. #2067
• Add support for paths in wrap_pyfunction and wrap_pymodule. #2081
• Enable wrap_pyfunction! to wrap a #[pyfunction] implemented in a different Rust module or crate. #2091
• Add PyAny::contains method (in operator for PyAny). #2115
• Add PyMapping::contains method (in operator for PyMapping). #2133
• Add garbage collection magic magic methods __traverse__ and __clear__ to #[pymethods]. #2159
• Add support for from_py_with on struct tuples and enums to override the default from-Python conversion. #2181
• Add eq, ne, lt, le, gt, ge methods to PyAny that wrap rich_compare. #2175
• Add Py::is and PyAny::is methods to check for object identity. #2183
• Add support for the __getattribute__ magic method. #2187

Changed

• PyType::is_subclass, PyErr::is_instance and PyAny::is_instance now operate run-time type object instead of a type known at compile-time. The old behavior is still available as PyType::is_subclass_of, PyErr::is_instance_of and PyAny::is_instance_of. #1985
• Rename some methods on PyErr (the old names are just marked deprecated for now): #2026
  • pytype -> get_type
  • pvalue -> value (and deprecate equivalent instance)
  • ptraceback -> traceback
  • from_instance -> from_value
  • into_instance -> into_value
• PyErr::new_type now takes an optional docstring and now returns PyResult<Py<PyType>> rather than a ffi::PyTypeObject pointer. #2027
• Deprecate PyType::is_instance; it is inconsistent with other is_instance methods in PyO3. Instead of typ.is_instance(obj), use obj.is_instance(typ). #2031
• __getitem__, __setitem__ and __delitem__ in #[pymethods] now implement both a Python mapping and sequence by default. #2065
• Improve performance and error messages for #[derive(FromPyObject)] for enums. #2068
• Reduce generated LLVM code size (to improve compile times) for:
  • internal handle_panic helper #2074 #2158
  • #[pyfunction] and #[pymethods] argument extraction #2075 #2085
  • #[pyclass] type object creation #2076 #2081 #2157
• Respect Rust privacy rules for items wrapped with wrap_pyfunction and wrap_pymodule. #2081
• Add modulo argument to __ipow__ magic method. #2083
• Fix FFI definition for _PyCFunctionFast. #2126
• PyDateTimeAPI and PyDateTime_TimeZone_UTC are now unsafe functions instead of statics. #2126
• PyDateTimeAPI does not implicitly call PyDateTime_IMPORT anymore to reflect the original Python API more closely. Before the first call to PyDateTime_IMPORT a null pointer is returned. Therefore before calling any of the following FFI functions PyDateTime_IMPORT must be called to avoid undefined behavior: #2126
  • PyDateTime_TimeZone_UTC
  • PyDate_Check
  • PyDate_CheckExact
  • PyDateTime_Check
  • PyDateTime_CheckExact
  • PyTime_Check
  • PyTime_CheckExact
  • PyDelta_Check
  • PyDelta_CheckExact
  • PyTZInfo_Check
  • PyTZInfo_CheckExact
  • PyDateTime_FromTimestamp
  • PyDate_FromTimestamp
• Deprecate the gc option for pyclass (e.g. #[pyclass(gc)]). Just implement a __traverse__ #[pymethod]. #2159
• The ml_meth field of PyMethodDef is now represented by the PyMethodDefPointer union. 2166
• Deprecate the #[pyproto] traits. #2173

Removed

• Remove all functionality deprecated in PyO3 0.14. #2007
• Remove Default impl for PyMethodDef. #2166
• Remove PartialEq impl for Py and PyAny (use the new is instead). #2183

Fixed

• Fix undefined symbol for PyObject_HasAttr on PyPy. #2025
• Fix memory leak in PyErr::into_value. #2026
• Fix clippy warning needless-option-as-deref in code generated by #[pyfunction] and #[pymethods]. #2040
• Fix undefined behavior in PySlice::indices. #2061
• Fix the wrap_pymodule! macro using the wrong name for a #[pymodule] with a #[pyo3(name = "..")] attribute. #2081
• Fix magic methods in #[pymethods] accepting implementations with the wrong number of arguments. #2083
• Fix panic in #[pyfunction] generated code when a required argument following an Option was not provided. #2093
• Fixed undefined behavior caused by incorrect ExactSizeIterator implementations. #2124
• Fix missing FFI definition PyCMethod_New on Python 3.9 and up. #2143
• Add missing FFI definitions _PyLong_NumBits and _PyLong_AsByteArray on PyPy. #2146
• Fix memory leak in implementation of AsPyPointer for Option<T>. #2160
• Fix FFI definition of _PyLong_NumBits to return size_t instead of c_int. #2161
• Fix TypeError thrown when argument parsing failed missing the originating causes. 2177

0.15.2 - 2022-04-14

Packaging

• Backport of PyPy 3.9 support from PyO3 0.16. #2262

0.15.1 - 2021-11-19

Added

• Add implementations for Py::as_ref and Py::into_ref for Py<PySequence>, Py<PyIterator> and Py<PyMapping>. #1682
• Add PyTraceback type to represent and format Python tracebacks. #1977

Changed

• #[classattr] constants with a known magic method name (which is lowercase) no longer trigger lint warnings expecting constants to be uppercase. #1969

Fixed

• Fix creating #[classattr] by functions with the name of a known magic method. #1969
• Fix use of catch_unwind in allow_threads which can cause fatal crashes. #1989
• Fix build failure on PyPy when abi3 features are activated. #1991
• Fix mingw platform detection. #1993
• Fix panic in __get__ implementation when accessing descriptor on type object. #1997

0.15.0 - 2021-11-03

Packaging

• pyo3's Cargo.toml now advertises links = "python" to inform Cargo that it links against libpython. #1819
• Added optional anyhow feature to convert anyhow::Error into PyErr. #1822
• Support Python 3.10. #1889
• Added optional eyre feature to convert eyre::Report into PyErr. #1893
• Support PyPy 3.8. #1948

Added

• Add PyList::get_item_unchecked and PyTuple::get_item_unchecked to get items without bounds checks. #1733
• Support #[doc = include_str!(...)] attributes on Rust 1.54 and up. #1746
• Add PyAny::py as a convenience for PyNativeType::py. #1751
• Add implementation of std::ops::Index<usize> for PyList, PyTuple and PySequence. #1825
• Add range indexing implementations of std::ops::Index for PyList, PyTuple and PySequence. #1829
• Add PyMapping type to represent the Python mapping protocol. #1844
• Add commonly-used sequence methods to PyList and PyTuple. #1849
• Add as_sequence methods to PyList and PyTuple. #1860
• Add support for magic methods in #[pymethods], intended as a replacement for #[pyproto]. #1864
• Add abi3-py310 feature. #1889
• Add PyCFunction::new_closure to create a Python function from a Rust closure. #1901
• Add support for positional-only arguments in #[pyfunction]. #1925
• Add PyErr::take to attempt to fetch a Python exception if present. #1957

Changed

• PyList, PyTuple and PySequence's APIs now accepts only usize indices instead of isize. #1733, #1802, #1803
• PyList::get_item and PyTuple::get_item now return PyResult<&PyAny> instead of panicking. #1733
• PySequence::in_place_repeat and PySequence::in_place_concat now return PyResult<&PySequence> instead of PyResult<()>, which is needed in case of immutable sequences such as tuples. #1803
• PySequence::get_slice now returns PyResult<&PySequence> instead of PyResult<&PyAny>. #1829
• Deprecate PyTuple::split_from. #1804
• Deprecate PyTuple::slice, new method PyTuple::get_slice added with usize indices. #1828
• Deprecate FFI definitions PyParser_SimpleParseStringFlags, PyParser_SimpleParseStringFlagsFilename, PyParser_SimpleParseFileFlags when building for Python 3.9. #1830
• Mark FFI definitions removed in Python 3.10 PyParser_ASTFromString, PyParser_ASTFromStringObject, PyParser_ASTFromFile, PyParser_ASTFromFileObject, PyParser_SimpleParseStringFlags, PyParser_SimpleParseStringFlagsFilename, PyParser_SimpleParseFileFlags, PyParser_SimpleParseString, PyParser_SimpleParseFile, Py_SymtableString, and Py_SymtableStringObject. #1830
• #[pymethods] now handles magic methods similarly to #[pyproto]. In the future, #[pyproto] may be deprecated. #1864
• Deprecate FFI definitions PySys_AddWarnOption, PySys_AddWarnOptionUnicode and PySys_HasWarnOptions. #1887
• Deprecate #[call] attribute in favor of using fn __call__. #1929
• Fix missing FFI definition _PyImport_FindExtensionObject on Python 3.10. #1942
• Change PyErr::fetch to panic in debug mode if no exception is present. #1957

Fixed

• Fix building with a conda environment on Windows. #1873
• Fix panic on Python 3.6 when calling Python::with_gil with Python initialized but threading not initialized. #1874
• Fix incorrect linking to version-specific DLL instead of python3.dll when cross-compiling to Windows with abi3. #1880
• Fix FFI definition for PyTuple_ClearFreeList incorrectly being present for Python 3.9 and up. #1887
• Fix panic in generated #[derive(FromPyObject)] for enums. #1888
• Fix cross-compiling to Python 3.7 builds with the "m" abi flag. #1908
• Fix __mod__ magic method fallback to __rmod__. #1934.
• Fix missing FFI definition _PyImport_FindExtensionObject on Python 3.10. #1942

0.14.5 - 2021-09-05

Added

• Make pyo3_build_config::InterpreterConfig and subfields public. #1848
• Add resolve-config feature to the pyo3-build-config to control whether its build script does anything. #1856

Fixed

• Fix 0.14.4 compile regression on s390x-unknown-linux-gnu target. #1850

0.14.4 - 2021-08-29

Changed

• Mark PyString::data as unsafe and disable it and some supporting PyUnicode FFI APIs (which depend on a C bitfield) on big-endian targets. #1834

0.14.3 - 2021-08-22

Added

• Add PyString::data to access the raw bytes stored in a Python string. #1794

Fixed

• Raise AttributeError to avoid panic when calling del on a #[setter] defined class property. #1779
• Restrict FFI definitions PyGILState_Check and Py_tracefunc to the unlimited API. #1787
• Add missing _type field to PyStatus struct definition. #1791
• Reduce lower bound num-complex optional dependency to support interop with rust-numpy and ndarray when building with the MSRV of 1.41 #1799
• Fix memory leak in Python::run_code. #1806
• Fix memory leak in PyModule::from_code. #1810
• Remove use of pyo3:: in pyo3::types::datetime which broke builds using -Z avoid-dev-deps #1811

0.14.2 - 2021-08-09

Added

• Add indexmap feature to add ToPyObject, IntoPy and FromPyObject implementations for indexmap::IndexMap. #1728
• Add pyo3_build_config::add_extension_module_link_args to use in build scripts to set linker arguments (for macOS). #1755
• Add Python::with_gil_unchecked unsafe variation of Python::with_gil to allow obtaining a Python in scenarios where Python::with_gil would fail. #1769

Changed

• PyErr::new no longer acquires the Python GIL internally. #1724
• Reverted PyO3 0.14.0's use of cargo:rustc-cdylib-link-arg in its build script, as Cargo unintentionally allowed crates to pass linker args to downstream crates in this way. Projects supporting macOS may need to restore .cargo/config.toml files. #1755

Fixed

• Fix regression in 0.14.0 rejecting usage of #[doc(hidden)] on structs and functions annotated with PyO3 macros. #1722
• Fix regression in 0.14.0 leading to incorrect code coverage being computed for #[pyfunction]s. #1726
• Fix incorrect FFI definition of Py_Buffer on PyPy. #1737
• Fix incorrect calculation of dictoffset on 32-bit Windows. #1475
• Fix regression in 0.13.2 leading to linking to incorrect Python library on Windows "gnu" targets. #1759
• Fix compiler warning: deny trailing semicolons in expression macro. #1762
• Fix incorrect FFI definition of Py_DecodeLocale. The 2nd argument is now *mut Py_ssize_t instead of Py_ssize_t. #1766

0.14.1 - 2021-07-04

Added

• Implement IntoPy<PyObject> for &PathBuf and &OsString. #1712

Fixed

• Fix crashes on PyPy due to incorrect definitions of PyList_SET_ITEM. #1713

0.14.0 - 2021-07-03

Packaging

• Update num-bigint optional dependency to 0.4. #1481
• Update num-complex optional dependency to 0.4. #1482
• Extend hashbrown optional dependency supported versions to include 0.11. #1496
• Support PyPy 3.7. #1538

Added

• Extend conversions for [T; N] to all N using const generics (on Rust 1.51 and up). #1128
• Add conversions between OsStr/ OsString and Python strings. #1379
• Add conversions between Path/ PathBuf and Python strings (and pathlib.Path objects). #1379 #1654
• Add a new set of #[pyo3(...)] attributes to control various PyO3 macro functionality:
  • #[pyo3(from_py_with = "...")] function arguments and struct fields to override the default from-Python conversion. #1411
  • #[pyo3(name = "...")] for setting Python names. #1567
  • #[pyo3(text_signature = "...")] for setting text signature. #1658
• Add FFI definition PyCFunction_CheckExact for Python 3.9 and later. #1425
• Add FFI definition Py_IS_TYPE. #1429
• Add FFI definition _Py_InitializeMain. #1473
• Add FFI definitions from cpython/import.h.#1475
• Add tuple and unit struct support for #[pyclass] macro. #1504
• Add FFI definition PyDateTime_TimeZone_UTC. #1572
• Add support for #[pyclass(extends=Exception)]. #1591
• Add PyErr::cause and PyErr::set_cause. #1679
• Add FFI definitions from cpython/pystate.h. #1687
• Add wrap_pyfunction! macro to pyo3::prelude. #1695

Changed

• Allow only one #[pymethods] block per #[pyclass] by default, to remove the dependency on inventory. Add a multiple-pymethods feature to opt-in the original behavior and dependency on inventory. #1457
• Change PyTimeAccess::get_fold to return a bool instead of a u8. #1397
• Deprecate FFI definition PyCFunction_Call for Python 3.9 and up. #1425
• Deprecate FFI definition PyModule_GetFilename. #1425
• The auto-initialize feature is no longer enabled by default. #1443
• Change PyCFunction::new and PyCFunction::new_with_keywords to take &'static str arguments rather than implicitly copying (and leaking) them. #1450
• Deprecate PyModule::call, PyModule::call0, PyModule::call1 and PyModule::get. #1492
• Add length information to PyBufferErrors raised from PyBuffer::copy_to_slice and PyBuffer::copy_from_slice. #1534
• Automatically set -undefined and dynamic_lookup linker arguments on macOS with the extension-module feature. #1539
• Deprecate #[pyproto] methods which are easier to implement as #[pymethods]: #1560
  • PyBasicProtocol::__bytes__ and PyBasicProtocol::__format__
  • PyContextProtocol::__enter__ and PyContextProtocol::__exit__
  • PyDescrProtocol::__delete__ and PyDescrProtocol::__set_name__
  • PyMappingProtocol::__reversed__
  • PyNumberProtocol::__complex__ and PyNumberProtocol::__round__
  • PyAsyncProtocol::__aenter__ and PyAsyncProtocol::__aexit__
• Deprecate several attributes in favor of the new #[pyo3(...)] options:
  • #[name = "..."], replaced by #[pyo3(name = "...")] #1567
  • #[pyfn(m, "name")], replaced by #[pyfn(m)] #[pyo3(name = "...")]. #1610
  • #[pymodule(name)], replaced by #[pymodule] #[pyo3(name = "...")] #1650
  • #[text_signature = "..."], replaced by #[pyo3(text_signature = "...")]. #1658
• Reduce LLVM line counts to improve compilation times. #1604
• No longer call PyEval_InitThreads in #[pymodule] init code. #1630
• Use METH_FASTCALL argument passing convention, when possible, to improve #[pyfunction] and method performance. #1619, #1660
• Filter sysconfigdata candidates by architecture when cross-compiling. #1626

Removed

• Remove deprecated exception names BaseException etc. #1426
• Remove deprecated methods Python::is_instance, Python::is_subclass, Python::release, Python::xdecref, and Py::from_owned_ptr_or_panic. #1426
• Remove many FFI definitions which never existed in the Python C-API:
  • (previously deprecated) PyGetSetDef_INIT, PyGetSetDef_DICT, PyCoro_Check, PyCoroWrapper_Check, and PyAsyncGen_Check #1426
  • PyMethodDef_INIT #1426
  • PyTypeObject_INIT #1429
  • PyObject_Check, PySuper_Check, and FreeFunc #1438
  • PyModuleDef_INIT #1630
• Remove pyclass implementation details from PyTypeInfo:
  • Type, DESCRIPTION, and FLAGS #1456
  • BaseType, BaseLayout, Layout, Initializer #1596
• Remove PYO3_CROSS_INCLUDE_DIR environment variable and the associated C header parsing functionality. #1521
• Remove raw_pycfunction! macro. #1619
• Remove PyClassAlloc trait. #1657
• Remove PyList::get_parked_item. #1664

Fixed

• Remove FFI definition PyCFunction_ClearFreeList for Python 3.9 and later. #1425
• PYO3_CROSS_LIB_DIR environment variable no long required when compiling for x86-64 Python from macOS arm64 and reverse. #1428
• Fix FFI definition _PyEval_RequestCodeExtraIndex, which took an argument of the wrong type. #1429
• Fix FFI definition PyIndex_Check missing with the abi3 feature. #1436
• Fix incorrect TypeError raised when keyword-only argument passed along with a positional argument in *args. #1440
• Fix inability to use a named lifetime for &PyTuple of *args in #[pyfunction]. #1440
• Fix use of Python argument for #[pymethods] inside macro expansions. #1505
• No longer include __doc__ in __all__ generated for #[pymodule]. #1509
• Always use cross-compiling configuration if any of the PYO3_CROSS family of environment variables are set. #1514
• Support EnvironmentError, IOError, and WindowsError on PyPy. #1533
• Fix unnecessary rebuilds when cycling between cargo check and cargo clippy in a Python virtualenv. #1557
• Fix segfault when dereferencing ffi::PyDateTimeAPI without the GIL. #1563
• Fix memory leak in FromPyObject implementations for u128 and i128. #1638
• Fix #[pyclass(extends=PyDict)] leaking the dict contents on drop. #1657
• Fix segfault when calling PyList::get_item with negative indices. #1668
• Fix FFI definitions of PyEval_SetProfile/PyEval_SetTrace to take Option<Py_tracefunc> parameters. #1692
• Fix ToPyObject impl for HashSet to accept non-default hashers. #1702

0.13.2 - 2021-02-12

Packaging

• Lower minimum supported Rust version to 1.41. #1421

Added

• Add unsafe API with_embedded_python_interpreter to initialize a Python interpreter, execute a closure, and finalize the interpreter. #1355
• Add serde feature which provides implementations of Serialize and Deserialize for Py<T>. #1366
• Add FFI definition _PyCFunctionFastWithKeywords on Python 3.7 and up. #1384
• Add PyDateTime::new_with_fold method. #1398
• Add size_hint impls for {PyDict,PyList,PySet,PyTuple}Iterators. #1699

Changed

• prepare_freethreaded_python will no longer register an atexit handler to call Py_Finalize. This resolves a number of issues with incompatible C extensions causing crashes at finalization. #1355
• Mark PyLayout::py_init, PyClassDict::clear_dict, and opt_to_pyobj safe, as they do not perform any unsafe operations. #1404

Fixed

• Fix support for using r#raw_idents as argument names in pyfunctions. #1383
• Fix typo in FFI definition for PyFunction_GetCode (was incorrectly PyFunction_Code). #1387
• Fix FFI definitions PyMarshal_WriteObjectToString and PyMarshal_ReadObjectFromString as available in limited API. #1387
• Fix FFI definitions PyListObject and those from funcobject.h as requiring non-limited API. #1387
• Fix unqualified Result usage in pyobject_native_type_base. #1402
• Fix build on systems where the default Python encoding is not UTF-8. #1405
• Fix build on mingw / MSYS2. #1423

0.13.1 - 2021-01-10

Added

• Add support for #[pyclass(dict)] and #[pyclass(weakref)] with the abi3 feature on Python 3.9 and up. #1342
• Add FFI definitions PyOS_BeforeFork, PyOS_AfterFork_Parent, PyOS_AfterFork_Child for Python 3.7 and up. #1348
• Add an auto-initialize feature to control whether PyO3 should automatically initialize an embedded Python interpreter. For compatibility this feature is enabled by default in PyO3 0.13.1, but is planned to become opt-in from PyO3 0.14.0. #1347
• Add support for cross-compiling to Windows without needing PYO3_CROSS_INCLUDE_DIR. #1350

Deprecated

• Deprecate FFI definitions PyEval_CallObjectWithKeywords, PyEval_CallObject, PyEval_CallFunction, PyEval_CallMethod when building for Python 3.9. #1338
• Deprecate FFI definitions PyGetSetDef_DICT and PyGetSetDef_INIT which have never been in the Python API. #1341
• Deprecate FFI definitions PyGen_NeedsFinalizing, PyImport_Cleanup (removed in 3.9), and PyOS_InitInterrupts (3.10). #1348
• Deprecate FFI definition PyOS_AfterFork for Python 3.7 and up. #1348
• Deprecate FFI definitions PyCoro_Check, PyAsyncGen_Check, and PyCoroWrapper_Check, which have never been in the Python API (for the first two, it is possible to use PyCoro_CheckExact and PyAsyncGen_CheckExact instead; these are the actual functions provided by the Python API). #1348
• Deprecate FFI definitions for PyUnicode_FromUnicode, PyUnicode_AsUnicode and PyUnicode_AsUnicodeAndSize, which will be removed from 3.12 and up due to PEP 623. #1370

Removed

• Remove FFI definition PyFrame_ClearFreeList when building for Python 3.9. #1341
• Remove FFI definition _PyDict_Contains when building for Python 3.10. #1341
• Remove FFI definitions PyGen_NeedsFinalizing and PyImport_Cleanup (for 3.9 and up), and PyOS_InitInterrupts (3.10). #1348

Fixed

• Stop including Py_TRACE_REFS config setting automatically if Py_DEBUG is set on Python 3.8 and up. #1334
• Remove #[deny(warnings)] attribute (and instead refuse warnings only in CI). #1340
• Fix deprecation warning for missing __module__ with #[pyclass]. #1343
• Correct return type of PyFrozenSet::empty to &PyFrozenSet (was incorrectly &PySet). #1351
• Fix missing Py_INCREF on heap type objects on Python versions before 3.8. #1365

0.13.0 - 2020-12-22

Packaging

• Drop support for Python 3.5 (as it is now end-of-life). #1250
• Bump minimum supported Rust version to 1.45. #1272
• Bump indoc dependency to 1.0. #1272
• Bump paste dependency to 1.0. #1272
• Rename internal crates pyo3cls and pyo3-derive-backend to pyo3-macros and pyo3-macros-backend respectively. #1317

Added

• Add support for building for CPython limited API. Opting-in to the limited API enables a single extension wheel built with PyO3 to be installable on multiple Python versions. This required a few minor changes to runtime behavior of of PyO3 #[pyclass] types. See the migration guide for full details. #1152
  • Add feature flags abi3-py36, abi3-py37, abi3-py38 etc. to set the minimum Python version when using the limited API. #1263
• Add argument names to TypeError messages generated by pymethod wrappers. #1212
• Add FFI definitions for PEP 587 "Python Initialization Configuration". #1247
• Add FFI definitions for PyEval_SetProfile and PyEval_SetTrace. #1255
• Add FFI definitions for context.h functions (PyContext_New, etc). #1259
• Add PyAny::is_instance method. #1276
• Add support for conversion between char and PyString. #1282
• Add FFI definitions for PyBuffer_SizeFromFormat, PyObject_LengthHint, PyObject_CallNoArgs, PyObject_CallOneArg, PyObject_CallMethodNoArgs, PyObject_CallMethodOneArg, PyObject_VectorcallDict, and PyObject_VectorcallMethod. #1287
• Add conversions between u128/i128 and PyLong for PyPy. #1310
• Add Python::version and Python::version_info to get the running interpreter version. #1322
• Add conversions for tuples of length 10, 11, and 12. #1454

Changed

• Change return type of PyType::name from Cow<str> to PyResult<&str>. #1152
• #[pyclass(subclass)] is now required for subclassing from Rust (was previously just required for subclassing from Python). #1152
• Change PyIterator to be consistent with other native types: it is now used as &PyIterator instead of PyIterator<'a>. #1176
• Change formatting of PyDowncastError messages to be closer to Python's builtin error messages. #1212
• Change Debug and Display impls for PyException to be consistent with PyAny. #1275
• Change Debug impl of PyErr to output more helpful information (acquiring the GIL if necessary). #1275
• Rename PyTypeInfo::is_instance and PyTypeInfo::is_exact_instance to PyTypeInfo::is_type_of and PyTypeInfo::is_exact_type_of. #1278
• Optimize PyAny::call0, Py::call0 and PyAny::call_method0 and Py::call_method0 on Python 3.9 and up. #1287
• Require double-quotes for pyclass name argument e.g #[pyclass(name = "MyClass")]. #1303

Deprecated

• Deprecate Python::is_instance, Python::is_subclass, Python::release, and Python::xdecref. #1292

Removed

• Remove deprecated ffi definitions PyUnicode_AsUnicodeCopy, PyUnicode_GetMax, _Py_CheckRecursionLimit, PyObject_AsCharBuffer, PyObject_AsReadBuffer, PyObject_CheckReadBuffer and PyObject_AsWriteBuffer, which will be removed in Python 3.10. #1217
• Remove unused python3 feature. #1235

Fixed

• Fix missing field in PyCodeObject struct (co_posonlyargcount) - caused invalid access to other fields in Python >3.7. #1260
• Fix building for x86_64-unknown-linux-musl target from x86_64-unknown-linux-gnu host. #1267
• Fix #[text_signature] interacting badly with rust r#raw_identifiers. #1286
• Fix FFI definitions for PyObject_Vectorcall and PyVectorcall_Call. #1287
• Fix building with Anaconda python inside a virtualenv. #1290
• Fix definition of opaque FFI types. #1312
• Fix using custom error type in pyclass #[new] methods. #1319

0.12.4 - 2020-11-28

Fixed

• Fix reference count bug in implementation of From<Py<T>> for PyObject, a regression introduced in PyO3 0.12. #1297

0.12.3 - 2020-10-12

Fixed

• Fix support for Rust versions 1.39 to 1.44, broken by an incorrect internal update to paste 1.0 which was done in PyO3 0.12.2. #1234

0.12.2 - 2020-10-12

Added

• Add support for keyword-only arguments without default values in #[pyfunction]. #1209
• Add Python::check_signals as a safe a wrapper for PyErr_CheckSignals. #1214

Fixed

• Fix invalid document for protocol methods. #1169
• Hide docs of PyO3 private implementation details in pyo3::class::methods. #1169
• Fix unnecessary rebuild on PATH changes when the python interpreter is provided by PYO3_PYTHON. #1231

0.12.1 - 2020-09-16

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

0.12.0 - 2020-09-12

Added

• Add FFI definitions Py_FinalizeEx, PyOS_getsig, and PyOS_setsig. #1021
• Add PyString::to_str for accessing PyString as &str. #1023
• Add Python::with_gil for executing a closure with the Python GIL. #1037
• Add type information to failures in PyAny::downcast. #1050
• Implement Debug for PyIterator. #1051
• Add PyBytes::new_with and PyByteArray::new_with for initialising bytes and bytearray objects using a closure. #1074
• Add #[derive(FromPyObject)] macro for enums and structs. #1065
• Add Py::as_ref and Py::into_ref for converting Py<T> to &T. #1098
• Add ability to return Result types other than PyResult from #[pyfunction], #[pymethod] and #[pyproto] functions. #1106.
• Implement ToPyObject, IntoPy, and FromPyObject for hashbrown's HashMap and HashSet types (requires the hashbrown feature). #1114
• Add #[pyfunction(pass_module)] and #[pyfn(pass_module)] to pass the module object as the first function argument. #1143
• Add PyModule::add_function and PyModule::add_submodule as typed alternatives to PyModule::add_wrapped. #1143
• Add native PyCFunction and PyFunction types. #1163

Changed

• Rework exception types: #1024 #1115
  • Rename exception types from e.g. RuntimeError to PyRuntimeError. The old names continue to exist but are deprecated.
  • Exception objects are now accessible as &T or Py<T>, just like other Python-native types.
  • Rename PyException::py_err to PyException::new_err.
  • Rename PyUnicodeDecodeErr::new_err to PyUnicodeDecodeErr::new.
  • Remove PyStopIteration::stop_iteration.
• Require T: Send for the return value T of Python::allow_threads. #1036
• Rename PYTHON_SYS_EXECUTABLE to PYO3_PYTHON. The old name will continue to work (undocumented) but will be removed in a future release. #1039
• Remove unsafe from signature of PyType::as_type_ptr. #1047
• Change return type of PyIterator::from_object to PyResult<PyIterator> (was Result<PyIterator, PyDowncastError>). #1051
• IntoPy is no longer implied by FromPy. #1063
• Change PyObject to be a type alias for Py<PyAny>. #1063
• Rework PyErr to be compatible with the std::error::Error trait: #1067 #1115
  • Implement Display, Error, Send and Sync for PyErr and PyErrArguments.
  • Add PyErr::instance for accessing PyErr as &PyBaseException.
  • PyErr's fields are now an implementation detail. The equivalent values can be accessed with PyErr::ptype, PyErr::pvalue and PyErr::ptraceback.
  • Change receiver of PyErr::print and PyErr::print_and_set_sys_last_vars to &self (was self).
  • Remove PyErrValue, PyErr::from_value, PyErr::into_normalized, and PyErr::normalize.
  • Remove PyException::into.
  • Remove Into<PyResult<T>> for PyErr and PyException.
• Change methods generated by #[pyproto] to return NotImplemented if Python should try a reversed operation. #1072
• Change argument to PyModule::add to impl IntoPy<PyObject> (was impl ToPyObject). #1124

Removed

• Remove many exception and PyErr APIs; see the "changed" section above. #1024 #1067 #1115
• Remove PyString::to_string (use new PyString::to_str). #1023
• Remove PyString::as_bytes. #1023
• Remove Python::register_any. #1023
• Remove GILGuard::acquire from the public API. Use Python::acquire_gil or Python::with_gil. #1036
• Remove the FromPy trait. #1063
• Remove the AsPyRef trait. #1098

Fixed

• Correct FFI definitions Py_SetProgramName and Py_SetPythonHome to take *const arguments (was *mut). #1021
• Fix FromPyObject for num_bigint::BigInt for Python objects with an __index__ method. #1027
• Correct FFI definition _PyLong_AsByteArray to take *mut c_uchar argument (was *const c_uchar). #1029
• Fix segfault with #[pyclass(dict, unsendable)]. #1058 #1059
• Fix using &Self as an argument type for functions in a #[pymethods] block. #1071
• Fix best-effort build against PyPy 3.6. #1092
• Fix many cases of lifetime elision in #[pyproto] implementations. #1093
• Fix detection of Python build configuration when cross-compiling. #1095
• Always link against libpython on android with the extension-module feature. #1095
• Fix the + operator not trying __radd__ when both __add__ and __radd__ are defined in PyNumberProtocol (and similar for all other reversible operators). #1107
• Fix building with Anaconda python. #1175

0.11.1 - 2020-06-30

Added

• #[pyclass(unsendable)]. #1009

Changed

• Update parking_lot dependency to 0.11. #1010

0.11.0 - 2020-06-28

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

0.10.1 - 2020-05-14

Fixed

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

0.10.0 - 2020-05-13

Added

• Add FFI definition _PyDict_NewPresized. #849
• Implement IntoPy<PyObject> for HashSet and BTreeSet. #864
• Add PyAny::dir method. #886
• Gate macros behind a macros feature (enabled by default). #897
• Add ability to define class attributes using #[classattr] on functions in #[pymethods]. #905
• Implement Clone for PyObject and Py<T>. #908
• Implement Deref<Target = PyAny> for all builtin types. (PyList, PyTuple, PyDict etc.) #911
• Implement Deref<Target = PyAny> for PyCell<T>. #911
• Add #[classattr] support for associated constants in #[pymethods]. #914

Changed

• Panics will now be raised as a Python PanicException. #797
• Change PyObject and Py<T> reference counts to decrement immediately upon drop when the GIL is held. #851
• Allow PyIterProtocol methods to use either PyRef or PyRefMut as the receiver type. #856
• Change the implementation of FromPyObject for Py<T> to apply to a wider range of T, including all T: PyClass. #880
• Move all methods from the ObjectProtocol trait to the PyAny struct. #911
• Remove need for #![feature(specialization)] in crates depending on PyO3. #917

Removed

• Remove PyMethodsProtocol trait. #889
• Remove num-traits dependency. #895
• Remove ObjectProtocol trait. #911
• Remove PyAny::None. Users should use Python::None instead. #911
• Remove all *ProtocolImpl traits. #917

Fixed

• Fix support for __radd__ and other __r*__ methods as implementations for Python mathematical operators. #839
• Fix panics during garbage collection when traversing objects that were already mutably borrowed. #855
• Prevent &'static references to Python objects as arguments to #[pyfunction] and #[pymethods]. #869
• Fix lifetime safety bug with AsPyRef::as_ref. #876
• Fix #[pyo3(get)] attribute on Py<T> fields. #880
• Fix segmentation faults caused by functions such as PyList::get_item returning borrowed objects when it was not safe to do so. #890
• Fix segmentation faults caused by nested Python::acquire_gil calls creating dangling references. #893
• Fix segmentatation faults when a panic occurs during a call to Python::allow_threads. #912

0.9.2 - 2020-04-09

Added

• FromPyObject implementations for HashSet and BTreeSet. #842

Fixed

• Correctly detect 32bit architecture. #830

0.9.1 - 2020-03-23

Fixed

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

0.9.0 - 2020-03-19

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

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

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

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 behavior is desired). #792
• PyModule::dict. #809
• Fix the case where DESCRIPTION is not null-terminated. #822

0.8.5 - 2020-01-05

Added

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

0.8.4 - 2019-12-14

Added

• Support for #[text_signature] attribute. #675

0.8.3 - 2019-11-23

Removed

• #[init] is removed. #658

Fixed

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

0.8.2 - 2019-10-27

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

0.8.1 - 2019-10-08

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

0.8.0 - 2019-09-16

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.

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.

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

0.7.0 - 2019-05-26

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>.
• Fixed several issues with argument parsing; notable, the *args and **kwargs tuple/dict now doesn't contain arguments that are otherwise assigned to parameters.

0.6.0 - 2019-03-28

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.

0.5.3 - 2019-01-04

Fixed

• Fix memory leak in ArrayList by kngwyu #316

0.5.2 - 2018-11-25

Fixed

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

0.5.1 - 2018-11-24

Yanked

0.5.0 - 2018-11-11

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

Changed

• Removes the types from the root module and the prelude. They now live in pyo3::types instead.
• All exceptions are constructed 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

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.
• The pyobject_extract macro

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

0.4.1 - 2018-08-20

Changed

• PyTryFrom's error is always to PyDowncastError

Fixed

• Fixed compilation on nightly since use_extern_macros was stabilized

Removed

• The pyobject_downcast macro

0.4.0 - 2018-07-30

Changed

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

Removed

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

0.3.2 - 2018-07-22

Changed

• Replaced concat_idents with mashup

0.3.1 - 2018-07-18

Fixed

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

0.3.0 - 2018-07-18

Added

• A few internal macros became part of the public api (#155, #186)
• Always clone in getters. This allows using the get-annotation on all Clone-Types

Changed

• Upgraded to syn 0.14 which means much better error messages 🎉
• 128 bit integer support by kngwyu (#137)
• proc_macro has been stabilized on nightly (rust-lang/rust#52081). This means that we can remove the proc_macro feature, but now we need the use_extern_macros from the 2018 edition instead.
• All proc macro are now prefixed with py and live in the prelude. This means you can use #[pyclass], #[pymethods], #[pyproto], #[pyfunction] and #[pymodinit] directly, at least after a use pyo3::prelude::*. They were also moved into a module called proc_macro. You shouldn't use #[pyo3::proc_macro::pyclass] or other longer paths in attributes because proc_macro_path_invoc isn't going to be stabilized soon.
• Renamed the base option in the pyclass macro to extends.
• #[pymodinit] uses the function name as module name, unless the name is overrriden with #[pymodinit(name)]
• The guide is now properly versioned.

0.2.7 - 2018-05-18

Fixed

• Fix nightly breakage with proc_macro_path

0.2.6 - 2018-04-03

Fixed

• Fix compatibility with TryFrom trait #137

0.2.5 - 2018-02-21

Added

• CPython 3.7 support

Fixed

• 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

0.2.4 - 2018-01-19

Added

• Allow to get mutable ref from PyObject #106
• Drop RefFromPyObject trait
• Add Python::register_any method

Fixed

• Fix impl FromPyObject for Py<T>
• Mark method that work with raw pointers as unsafe #95

0.2.3 - 11-27-2017

Changed

• Rustup to 1.23.0-nightly 2017-11-07

Fixed

• Proper c_char usage #93

Removed

• Remove use of now unneeded 'AsciiExt' trait

0.2.2 - 09-26-2017

Changed

• Rustup to 1.22.0-nightly 2017-09-30

0.2.1 - 09-26-2017

Fixed

• Fix rustc const_fn nightly breakage

0.2.0 - 08-12-2017

Added

• Added inheritance support #15
• Added weakref support #56
• Added subclass support #64
• Added self.__dict__ supoort #68
• Added pyo3::prelude module #70
• Better Iterator support for PyTuple, PyList, PyDict #75
• Introduce IntoPyDictPointer similar to IntoPyTuple #69

Changed

• Allow to add gc support without implementing PyGCProtocol #57
• Refactor PyErr implementation. Drop py parameter from constructor.

0.1.0 - 07-23-2017

Added

• Initial release