Prepare changelog for 1.15 release (#18583)

wesleywright · hauntsaninja · wesleywright · commit 1a265024f901 · 2025-02-05T00:06:26.000Z
Co-authored-by: Shantanu &lt;12621235+hauntsaninja@users.noreply.github.com&gt;
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -1,15 +1,30 @@
 # Mypy Release Notes
 
-## Next release
+## Next Release
 
-### Performance improvements
+...
+
+## Mypy 1.15 (Unreleased)
+
+We’ve just uploaded mypy 1.15 to the Python Package Index ([PyPI](https://pypi.org/project/mypy/)).
+Mypy is a static type checker for Python. This release includes new features and bug fixes.
+You can install it as follows:
+
+    python3 -m pip install -U mypy
+
+You can read the full documentation for this release on [Read the Docs](http://mypy.readthedocs.io).
+
+### Performance Improvements
 
 Mypy may be 5-30% faster. This improvement comes largely from tuning the performance of the
-garbage collector.
+garbage collector. Additionally, the release includes several micro-optimizations that may be
+impactful for very large projects.
 
-Contributed by Jukka Lehtosalo (PR [18306](https://github.com/python/mypy/pull/18306)).
+Contributed by Jukka Lehtosalo (PR [18306](https://github.com/python/mypy/pull/18306),
+PR [18302](https://github.com/python/mypy/pull/18302, PR [18298](https://github.com/python/mypy/pull/18298,
+PR [18299](https://github.com/python/mypy/pull/18299).
 
-### Mypyc accelerated mypy wheels for aarch64
+### Mypyc Accelerated Mypy Wheels for `aarch64`
 
 Mypy can compile itself to C extension modules using mypyc. This makes mypy 3-5x faster
 than if mypy is interpreted with pure Python. We now build and upload mypyc accelerated
@@ -29,7 +44,7 @@ Use this flag to disable this behavior. `--strict-bytes` will be enabled by defa
 Contributed by Ali Hamdan (PR [18263](https://github.com/python/mypy/pull/18263)) and
 Shantanu Jain (PR [13952](https://github.com/python/mypy/pull/13952)).
 
-### Improvements to reachability analysis and partial type handling in loops
+### Improvements to Reachability Analysis and Partial Type Handling in Loops
 
 This change results in mypy better modelling control flow within loops and hence detecting several
 issues it previously did not detect. In some cases, this change may require use of an additional
@@ -41,7 +56,7 @@ PR [18433](https://github.com/python/mypy/pull/18433)).
 (Speaking of partial types, another reminder that mypy plans on enabling `--local-partial-types`
 by default in **mypy 2.0**).
 
-### Better discovery of configuration files
+### Better Discovery of Configuration Files
 
 Mypy will now walk up the filesystem (up until a repository or file system root) to discover
 configuration files. See the
@@ -51,7 +66,7 @@ for more details.
 Contributed by Mikhail Shiryaev and Shantanu Jain
 (PR [16965](https://github.com/python/mypy/pull/16965), PR [18482](https://github.com/python/mypy/pull/18482))
 
-### Better line numbers for decorators and slice expressions
+### Better Line Numbers for Decorators and Slice Expressions
 
 Mypy now uses more correct line numbers for decorators and slice expressions. In some cases, this
 may necessitate changing the location of a `# type: ignore` comment.
@@ -68,6 +83,105 @@ Support for this will be dropped in the first half of 2025!
 
 Contributed by Marc Mueller (PR [17492](https://github.com/python/mypy/pull/17492)).
 
+### Mypyc Improvements
+
+ * Fix `__init__` for classes with `@attr.s(slots=True)` (Advait Dixit, PR [18447](https://github.com/python/mypy/pull/18447))
+ * Report error for nested class instead of crashing (Valentin Stanciu, PR [18460](https://github.com/python/mypy/pull/18460))
+ * Fix `InitVar` for dataclasses (Advait Dixit, PR [18319](https://github.com/python/mypy/pull/18319))
+ * Remove unnecessary mypyc files from wheels (Marc Mueller, PR [18416](https://github.com/python/mypy/pull/18416))
+ * Get capsule pointer from module instead of `PyCapsule_Import` (Advait Dixit, PR [18286](https://github.com/python/mypy/pull/18286))
+ * Add lowered primitive for unsafe list get item op (Jukka Lehtosalo, PR [18136](https://github.com/python/mypy/pull/18136))
+ * Fix iteration over `NamedTuple` objects (Advait Dixit, PR [18254](https://github.com/python/mypy/pull/18254))
+ * Mark mypyc package with `py.typed` (bzoracler, PR [18253](https://github.com/python/mypy/pull/18253))
+ * Update docstrings of IR builder classes (Jukka Lehtosalo, PR [18246](https://github.com/python/mypy/pull/18246))
+ * Fix list index while checking for `Enum` class (Advait Dixit, PR [18426](https://github.com/python/mypy/pull/18426))
+ * Update `pythoncapi_compat.h` (Marc Mueller, PR [18340](https://github.com/python/mypy/pull/18340))
+
+### Stubgen Improvements
+
+ * Improve dataclass init signatures (Marc Mueller, PR [18430](https://github.com/python/mypy/pull/18430))
+ * Preserve `dataclass_transform` decorator (Marc Mueller, PR [18418](https://github.com/python/mypy/pull/18418))
+ * Fix `UnpackType` for 3.11+ (Marc Mueller, PR [18421](https://github.com/python/mypy/pull/18421))
+ * Improve `self` annotations (Marc Mueller, PR [18420](https://github.com/python/mypy/pull/18420))
+ * Print `InspectError` traceback in stubgen `walk_packages` when verbose is specified (Gareth, PR [18224](https://github.com/python/mypy/pull/18224))
+
+### Stubtest Improvements
+
+ * Fix crash with numpy array default values (Ali Hamdan, PR [18353](https://github.com/python/mypy/pull/18353))
+ * Distinguish metaclass attributes from class attributes (Stephen Morton, PR [18314](https://github.com/python/mypy/pull/18314))
+
+### Fixes to Crashes
+
+ * Prevent crash with `Unpack` of a fixed tuple in PEP695 type alias (Stanislav Terliakov, PR [18451](https://github.com/python/mypy/pull/18451))
+ * Fix crash with `--cache-fine-grained --cache-dir=/dev/null` (Shantanu, PR [18457](https://github.com/python/mypy/pull/18457))
+ * Prevent crashing when `match` arms use name of existing callable (Stanislav Terliakov, PR [18449](https://github.com/python/mypy/pull/18449))
+ * Gracefully handle encoding errors when writing to stdout (Brian Schubert, PR [18292](https://github.com/python/mypy/pull/18292))
+
+### Documentation Updates
+
+ * Add `sphinx_inline_tabs` to docs (Marc Mueller, PR [18262](https://github.com/python/mypy/pull/18262))
+ * Document any `TYPE_CHECKING` name works (Shantanu, PR [18443](https://github.com/python/mypy/pull/18443))
+ * Update docs not to mention 3.8 where possible (sobolevn, PR [18455](https://github.com/python/mypy/pull/18455))
+ * Mention `ignore_errors` in exclude docs (Shantanu, PR [18412](https://github.com/python/mypy/pull/18412))
+ * Add `Self` misuse to common issues (Shantanu, PR [18261](https://github.com/python/mypy/pull/18261))
+
+### Other Notable Fixes and Improvements
+
+ * Fix literal context for ternary expressions (Ivan Levkivskyi, PR [18545](https://github.com/python/mypy/pull/18545))
+ * Ignore `dataclass.__replace__` LSP violations (Marc Mueller, PR [18464](https://github.com/python/mypy/pull/18464))
+ * Bind `self` to the class being defined when checking multiple inheritance (Stanislav Terliakov, PR [18465](https://github.com/python/mypy/pull/18465))
+ * Fix attribute type resolution with multiple inheritance (Stanislav Terliakov, PR [18415](https://github.com/python/mypy/pull/18415))
+ * Improve security of our GitHub Actions (sobolevn, PR [18413](https://github.com/python/mypy/pull/18413))
+ * Unwrap `type[Union[...]]` when solving typevar constraints (Stanislav Terliakov, PR [18266](https://github.com/python/mypy/pull/18266))
+ * Allow `Any` to match sequence patterns in match/case (Stanislav Terliakov, PR [18448](https://github.com/python/mypy/pull/18448))
+ * Fix parent generics mapping when overriding generic attribute with property (Stanislav Terliakov, PR [18441](https://github.com/python/mypy/pull/18441))
+ * Dedicated error code for explicit `Any` (Shantanu, PR [18398](https://github.com/python/mypy/pull/18398))
+ * Reject invalid `ParamSpec` locations (Stanislav Terliakov, PR [18278](https://github.com/python/mypy/pull/18278))
+ * Remove stubs no longer in typeshed (Shantanu, PR [18373](https://github.com/python/mypy/pull/18373))
+ * Allow inverting `--local-partial-types` (Shantanu, PR [18377](https://github.com/python/mypy/pull/18377))
+ * Allow to use `Final` and `ClassVar` after Python 3.13 (정승원, PR [18358](https://github.com/python/mypy/pull/18358))
+ * Update to include latest stubs in typeshed (Shantanu, PR [18366](https://github.com/python/mypy/pull/18366))
+ * Fix `--install-types` masking failure details (wyattscarpenter, PR [17485](https://github.com/python/mypy/pull/17485))
+ * Reject promotions when checking against protocols (Christoph Tyralla, PR [18360](https://github.com/python/mypy/pull/18360))
+ * Don't erase type object args in diagnostics (Shantanu, PR [18352](https://github.com/python/mypy/pull/18352))
+ * Clarify status in `dmypy status` output (Kcornw, PR [18331](https://github.com/python/mypy/pull/18331))
+ * Disallow no-args generic aliases when using PEP 613 explicit aliases (Brian Schubert, PR [18173](https://github.com/python/mypy/pull/18173))
+ * Suppress errors for unreachable branches in conditional expressions (Brian Schubert, PR [18295](https://github.com/python/mypy/pull/18295))
+ * Do not allow `ClassVar` and `Final` in `TypedDict` and `NamedTuple` (sobolevn, PR [18281](https://github.com/python/mypy/pull/18281))
+ * Fail typecheck if not enough or too many types provided to `TypeAliasType` (bzoracler, PR [18308](https://github.com/python/mypy/pull/18308))
+ * Use more precise context for `TypedDict` plugin errors (Brian Schubert, PR [18293](https://github.com/python/mypy/pull/18293))
+ * Use more precise context for invalid type argument errors (Brian Schubert, PR [18290](https://github.com/python/mypy/pull/18290))
+ * Do not allow `type[]` to contain `Literal` types (sobolevn, PR [18276](https://github.com/python/mypy/pull/18276))
+ * Allow bytearray/bytes comparisons with --disable-bytearray-promotion (Jukka Lehtosalo, PR [18255](https://github.com/python/mypy/pull/18255))
+ * More LSP compatibility on arg names (Shantanu, PR [18363](https://github.com/python/mypy/pull/18363))
+
+### Acknowledgements
+
+Thanks to all mypy contributors who contributed to this release:
+
+- Advait Dixit
+- Ali Hamdan
+- Brian Schubert
+- bzoracler
+- Cameron Matsui
+- Christoph Tyralla
+- Gareth
+- Ivan Levkivskyi
+- Jukka Lehtosalo
+- Kcornw
+- Marc Mueller
+- Mikhail f. Shiryaev
+- Shantanu
+- sobolevn
+- Stanislav Terliakov
+- Stephen Morton
+- Valentin Stanciu
+- Viktor Szépe
+- wyattscarpenter
+- 정승원
+
+I’d also like to thank my employer, Dropbox, for supporting mypy development.
+
 ## Mypy 1.14
 
 We’ve just uploaded mypy 1.14 to the Python Package Index ([PyPI](https://pypi.org/project/mypy/)).
