PyO3 · bors · May 31, 2023 · May 28, 2023
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -10,6 +10,48 @@ To see unreleased changes, please see the [CHANGELOG on the main branch guide](h
 
 <!-- towncrier release notes start -->
 
+## [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](/~https://github.com/PyO3/pyo3/pull/3152)
+
+### Added
+
+- Accept `text_signature` option (and automatically generate signature) for `#[new]` in `#[pymethods]`. [#2980](/~https://github.com/PyO3/pyo3/pull/2980)
+- Add support for converting to and from Python's `decimal.Decimal` and `rust_decimal::Decimal`. [#3016](/~https://github.com/PyO3/pyo3/pull/3016)
+- Add `#[pyo3(from_item_all)]` when deriving `FromPyObject` to specify `get_item` as getter for all fields. [#3120](/~https://github.com/PyO3/pyo3/pull/3120)
+- Add `pyo3::exceptions::PyBaseExceptionGroup` for Python 3.11, and corresponding FFI definition `PyExc_BaseExceptionGroup`. [#3141](/~https://github.com/PyO3/pyo3/pull/3141)
+- Accept `#[new]` with `#[classmethod]` to create a constructor which receives a (subtype's) class/`PyType` as its first argument. [#3157](/~https://github.com/PyO3/pyo3/pull/3157)
+- Add `PyClass::get` and `Py::get` for GIL-indepedent access to classes with `#[pyclass(frozen)]`. [#3158](/~https://github.com/PyO3/pyo3/pull/3158)
+- Add `PyAny::is_exact_instance` and `PyAny::is_exact_instance_of`. [#3161](/~https://github.com/PyO3/pyo3/pull/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](/~https://github.com/PyO3/pyo3/pull/2881)
+- Deprecate `text_signature` option on `#[pyclass]` structs. [#2980](/~https://github.com/PyO3/pyo3/pull/2980)
+- No longer wrap `anyhow::Error`/`eyre::Report` containing a basic `PyErr` without a chain in a `PyRuntimeError`. [#3004](/~https://github.com/PyO3/pyo3/pull/3004)
+- - Change `#[getter]` and `#[setter]` to use a common call "trampoline" to slightly reduce generated code size and compile times. [#3029](/~https://github.com/PyO3/pyo3/pull/3029)
+- Improve default values for str, numbers and bool in automatically-generated `text_signature`. [#3050](/~https://github.com/PyO3/pyo3/pull/3050)
+- Improve default value for `None` in automatically-generated `text_signature`. [#3066](/~https://github.com/PyO3/pyo3/pull/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](/~https://github.com/PyO3/pyo3/pull/3111)
+- Extend the lifetime of the GIL token returned by `PyRef::py` and `PyRefMut::py` to match the underlying borrow. [#3131](/~https://github.com/PyO3/pyo3/pull/3131)
+- Safe access to the GIL, for example via `Python::with_gil`, is now locked inside of implementations of the `__traverse__` slot. [#3168](/~https://github.com/PyO3/pyo3/pull/3168)
+
+### Removed
+
+- Remove all functionality deprecated in PyO3 0.17, most prominently `Python::acquire_gil` is replaced by `Python::with_gil`. [#2981](/~https://github.com/PyO3/pyo3/pull/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](/~https://github.com/PyO3/pyo3/pull/3036)
+- Fix panic on `fmt::Display`, instead return `"<unprintable object>"` string and report error via `sys.unraisablehook()` [#3062](/~https://github.com/PyO3/pyo3/pull/3062)
+- Fix a compile error of "temporary value dropped while borrowed" when `#[pyfunction]`s take references into `#[pyclass]`es [#3142](/~https://github.com/PyO3/pyo3/pull/3142)
+- Fix crashes caused by PyO3 applying deferred reference count updates when entering a `__traverse__` implementation. [#3168](/~https://github.com/PyO3/pyo3/pull/3168)
+- Forbid running the `Drop` implementations of unsendable classes on other threads. [#3176](/~https://github.com/PyO3/pyo3/pull/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](/~https://github.com/PyO3/pyo3/pull/3178)
+
+
 ## [0.18.3] - 2023-04-13
 
 ### Added
@@ -1436,7 +1478,8 @@ Yanked
 
 - Initial release
 
-[Unreleased]: /~https://github.com/pyo3/pyo3/compare/v0.18.3...HEAD
+[Unreleased]: /~https://github.com/pyo3/pyo3/compare/v0.19.0...HEAD
+[0.19.0]: /~https://github.com/pyo3/pyo3/compare/v0.18.3...v0.19.0
 [0.18.3]: /~https://github.com/pyo3/pyo3/compare/v0.18.2...v0.18.3
 [0.18.2]: /~https://github.com/pyo3/pyo3/compare/v0.18.1...v0.18.2
 [0.18.1]: /~https://github.com/pyo3/pyo3/compare/v0.18.0...v0.18.1

diff --git a/Cargo.toml b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "pyo3"
-version = "0.18.3"
+version = "0.19.0"
 description = "Bindings to Python interpreter"
 authors = ["PyO3 Project and Contributors </~https://github.com/PyO3>"]
 readme = "README.md"
@@ -20,10 +20,10 @@ parking_lot = ">= 0.11, < 0.13"
 memoffset = "0.9"
 
 # ffi bindings to the python interpreter, split into a separate crate so they can be used independently
-pyo3-ffi = { path = "pyo3-ffi", version = "=0.18.3" }
+pyo3-ffi = { path = "pyo3-ffi", version = "=0.19.0" }
 
 # support crates for macros feature
-pyo3-macros = { path = "pyo3-macros", version = "=0.18.3", optional = true }
+pyo3-macros = { path = "pyo3-macros", version = "=0.19.0", optional = true }
 indoc = { version = "1.0.3", optional = true }
 unindent = { version = "0.1.4", optional = true }
 
@@ -58,7 +58,7 @@ rust_decimal = { version = "1.8.0", features = ["std"] }
 widestring = "0.5.1"
 
 [build-dependencies]
-pyo3-build-config = { path = "pyo3-build-config", version = "0.18.3", features = ["resolve-config"] }
+pyo3-build-config = { path = "pyo3-build-config", version = "0.19.0", features = ["resolve-config"] }
 
 [features]
 default = ["macros"]

diff --git a/README.md b/README.md
@@ -68,7 +68,7 @@ name = "string_sum"
 crate-type = ["cdylib"]
 
 [dependencies]
-pyo3 = { version = "0.18.3", features = ["extension-module"] }
+pyo3 = { version = "0.19.0", features = ["extension-module"] }
 ```
 
 **`src/lib.rs`**
@@ -137,7 +137,7 @@ Start a new project with `cargo new` and add  `pyo3` to the `Cargo.toml` like th
 
 ```toml
 [dependencies.pyo3]
-version = "0.18.3"
+version = "0.19.0"
 features = ["auto-initialize"]
 ```
 

diff --git a/examples/Cargo.toml b/examples/Cargo.toml
@@ -5,7 +5,7 @@ publish = false
 edition = "2018"
 
 [dev-dependencies]
-pyo3 = { version = "0.18.3", path = "..", features = ["auto-initialize", "extension-module"] }
+pyo3 = { version = "0.19.0", path = "..", features = ["auto-initialize", "extension-module"] }
 
 [[example]]
 name = "decorator"

diff --git a/examples/decorator/.template/pre-script.rhai b/examples/decorator/.template/pre-script.rhai
@@ -1,4 +1,4 @@
-variable::set("PYO3_VERSION", "0.18.3");
+variable::set("PYO3_VERSION", "0.19.0");
 file::rename(".template/Cargo.toml", "Cargo.toml");
 file::rename(".template/pyproject.toml", "pyproject.toml");
 file::delete(".template");
diff --git a/examples/maturin-starter/.template/pre-script.rhai b/examples/maturin-starter/.template/pre-script.rhai
@@ -1,4 +1,4 @@
-variable::set("PYO3_VERSION", "0.18.3");
+variable::set("PYO3_VERSION", "0.19.0");
 file::rename(".template/Cargo.toml", "Cargo.toml");
 file::rename(".template/pyproject.toml", "pyproject.toml");
 file::delete(".template");
diff --git a/examples/plugin/.template/pre-script.rhai b/examples/plugin/.template/pre-script.rhai
@@ -1,4 +1,4 @@
-variable::set("PYO3_VERSION", "0.18.3");
+variable::set("PYO3_VERSION", "0.19.0");
 file::rename(".template/Cargo.toml", "Cargo.toml");
 file::rename(".template/plugin_api/Cargo.toml", "plugin_api/Cargo.toml");
 file::delete(".template");
diff --git a/examples/setuptools-rust-starter/.template/pre-script.rhai b/examples/setuptools-rust-starter/.template/pre-script.rhai
@@ -1,4 +1,4 @@
-variable::set("PYO3_VERSION", "0.18.3");
+variable::set("PYO3_VERSION", "0.19.0");
 file::rename(".template/Cargo.toml", "Cargo.toml");
 file::rename(".template/setup.cfg", "setup.cfg");
 file::delete(".template");
diff --git a/examples/word-count/.template/pre-script.rhai b/examples/word-count/.template/pre-script.rhai
@@ -1,3 +1,3 @@
-variable::set("PYO3_VERSION", "0.18.3");
+variable::set("PYO3_VERSION", "0.19.0");
 file::rename(".template/Cargo.toml", "Cargo.toml");
 file::delete(".template");
diff --git a/guide/src/migration.md b/guide/src/migration.md
@@ -5,6 +5,27 @@ For a detailed list of all changes, see the [CHANGELOG](changelog.md).
 
 ## from 0.18.* to 0.19
 
+### Access to `Python` inside `__traverse__` implementations are now forbidden
+
+During `__traverse__` implementations for Python's Garbage Collection it is forbidden to do anything other than visit the members of the `#[pyclass]` being traversed. This means making Python function calls or other API calls are forbidden.
+
+Previous versions of PyO3 would allow access to `Python` (e.g. via `Python::with_gil`), which could cause the Python interpreter to crash or otherwise confuse the garbage collection algorithm.
+
+Attempts to acquire the GIL will now panic. See [#3165](/~https://github.com/PyO3/pyo3/issues/3165) for more detail.
+
+```rust,ignore
+# use pyo3::prelude::*;
+
+#[pyclass]
+struct SomeClass {}
+
+impl SomeClass {
+    fn __traverse__(&self, pyo3::class::gc::PyVisit<'_>) -> Result<(), pyo3::class::gc::PyTraverseError>` {
+        Python::with_gil(|| { /*...*/ })  // ERROR: this will panic
+    }
+}
+```
+
 ### Smarter `anyhow::Error` / `eyre::Report` conversion when inner error is "simple" `PyErr`
 
 When converting from `anyhow::Error` or `eyre::Report` to `PyErr`, if the inner error is a "simple" `PyErr` (with no source error), then the inner error will be used directly as the `PyErr` instead of wrapping it in a new `PyRuntimeError` with the original information converted into a string.

diff --git a/newsfragments/2881.changed.md b/newsfragments/2881.changed.md
diff --git a/newsfragments/2980.added.md b/newsfragments/2980.added.md
diff --git a/newsfragments/2980.changed.md b/newsfragments/2980.changed.md
diff --git a/newsfragments/2981.removed.md b/newsfragments/2981.removed.md
diff --git a/newsfragments/3004.changed.md b/newsfragments/3004.changed.md
diff --git a/newsfragments/3016.added.md b/newsfragments/3016.added.md
diff --git a/newsfragments/3029.changed.md b/newsfragments/3029.changed.md
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diff --git a/newsfragments/3062.fixed.md b/newsfragments/3062.fixed.md
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diff --git a/newsfragments/3131.changed.md b/newsfragments/3131.changed.md
diff --git a/newsfragments/3141.added.md b/newsfragments/3141.added.md
diff --git a/newsfragments/3142.fixed.md b/newsfragments/3142.fixed.md
diff --git a/newsfragments/3146.added.md b/newsfragments/3146.added.md
diff --git a/newsfragments/3152.packaging.md b/newsfragments/3152.packaging.md
diff --git a/newsfragments/3157.added.md b/newsfragments/3157.added.md
diff --git a/newsfragments/3158.added.md b/newsfragments/3158.added.md
diff --git a/newsfragments/3161.added.md b/newsfragments/3161.added.md
diff --git a/newsfragments/3168.changed.md b/newsfragments/3168.changed.md
diff --git a/newsfragments/3168.fixed.md b/newsfragments/3168.fixed.md
diff --git a/newsfragments/3176.fixed.md b/newsfragments/3176.fixed.md
diff --git a/newsfragments/3178.fixed.md b/newsfragments/3178.fixed.md
diff --git a/pyo3-build-config/Cargo.toml b/pyo3-build-config/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "pyo3-build-config"
-version = "0.18.3"
+version = "0.19.0"
 description = "Build configuration for the PyO3 ecosystem"
 authors = ["PyO3 Project and Contributors </~https://github.com/PyO3>"]
 keywords = ["pyo3", "python", "cpython", "ffi"]

diff --git a/pyo3-ffi/Cargo.toml b/pyo3-ffi/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "pyo3-ffi"
-version = "0.18.3"
+version = "0.19.0"
 description = "Python-API bindings for the PyO3 ecosystem"
 authors = ["PyO3 Project and Contributors </~https://github.com/PyO3>"]
 keywords = ["pyo3", "python", "cpython", "ffi"]
@@ -38,4 +38,4 @@ generate-import-lib = ["pyo3-build-config/python3-dll-a"]
 
 
 [build-dependencies]
-pyo3-build-config = { path = "../pyo3-build-config", version = "0.18.3", features = ["resolve-config"] }
+pyo3-build-config = { path = "../pyo3-build-config", version = "0.19.0", features = ["resolve-config"] }
diff --git a/pyo3-macros-backend/Cargo.toml b/pyo3-macros-backend/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "pyo3-macros-backend"
-version = "0.18.3"
+version = "0.19.0"
 description = "Code generation for PyO3 package"
 authors = ["PyO3 Project and Contributors </~https://github.com/PyO3>"]
 keywords = ["pyo3", "python", "cpython", "ffi"]

diff --git a/pyo3-macros/Cargo.toml b/pyo3-macros/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "pyo3-macros"
-version = "0.18.3"
+version = "0.19.0"
 description = "Proc macros for PyO3 package"
 authors = ["PyO3 Project and Contributors </~https://github.com/PyO3>"]
 keywords = ["pyo3", "python", "cpython", "ffi"]
@@ -22,4 +22,4 @@ abi3 = ["pyo3-macros-backend/abi3"]
 proc-macro2 = { version = "1", default-features = false }
 quote = "1"
 syn = { version = "1.0.85", features = ["full", "extra-traits"] }
-pyo3-macros-backend = { path = "../pyo3-macros-backend", version = "=0.18.3" }
+pyo3-macros-backend = { path = "../pyo3-macros-backend", version = "=0.19.0" }
diff --git a/pyproject.toml b/pyproject.toml
@@ -20,7 +20,7 @@ exclude = '''
 
 [tool.towncrier]
 filename = "CHANGELOG.md"
-version = "0.18.3"
+version = "0.19.0"
 start_string = "<!-- towncrier release notes start -->\n"
 template = ".towncrier.template.md"
 title_format = "## [{version}] - {project_date}"