Update changelog for release 1.14 (#18301)

As with all releases, I've omitted non user visible changes (e.g. refactoring, test-only changes) and trivial changes (e.g. fix typo) for individual list of PRs, but contributors should still be in the final "thanks" list.
python · Dec 19, 2024 · 3132207 · 3132207
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -2,6 +2,18 @@
 
 ## Next release
 
+...
+
+## Mypy 1.14 (unreleased)
+
+We’ve just uploaded mypy 1.14 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).
+
 ### Change to enum membership semantics
 
 As per the updated [typing specification for enums](https://typing.readthedocs.io/en/latest/spec/enums.html#defining-members),
@@ -39,8 +51,244 @@ class Pet(Enum):
     LION = ...  # Member attribute with unknown value and unknown type
 ```
 
-Contributed by Terence Honles in PR [17207](https://github.com/python/mypy/pull/17207) and
-Shantanu Jain in PR [18068](https://github.com/python/mypy/pull/18068).
+Contributed by Terence Honles (PR [17207](https://github.com/python/mypy/pull/17207)) and
+Shantanu Jain (PR [18068](https://github.com/python/mypy/pull/18068)).
+
+### Added support for @deprecated decorator (PEP 702)
+
+Mypy can now issue errors or notes when code imports a deprecated feature
+explicitly with a `from mod import depr` statement, or uses a deprecated feature
+imported otherwise or defined locally. Features are considered deprecated when
+decorated with `warnings.deprecated`, as specified in [PEP 702](https://peps.python.org/pep-0702).
+
+You can enable the error code via `--enable-error-code=deprecated` on the mypy
+command line or `enable_error_code = deprecated` in the mypy config file.
+Use the command line flag `--report-deprecated-as-note` or config file option
+`report_deprecated_as_note=True` to turn all such errors into notes.
+
+Deprecation errors will be enabled by default in a future mypy version.
+
+Contributed by Christoph Tyralla
+
+List of changes:
+
+ * PEP 702 (@deprecated): descriptors (Christoph Tyralla, PR [18090](https://github.com/python/mypy/pull/18090))
+ * Make "deprecated" Note a standard Error, disabled by default (Valentin Stanciu, PR [18192](https://github.com/python/mypy/pull/18192))
+ * PEP 702 (@deprecated): consider all possible type positions (Christoph Tyralla, PR [17926](https://github.com/python/mypy/pull/17926))
+ * PEP 702 (@deprecated): improve the handling of explicit type annotations of assignment statements (Christoph Tyralla, PR [17899](https://github.com/python/mypy/pull/17899))
+ * Add basic support for PEP 702 (@deprecated). (Christoph Tyralla, PR [17476](https://github.com/python/mypy/pull/17476))
+
+### Mypy can be configured to analyze untyped modules
+
+Mypy normally doesn't analyze imports from modules without stubs or a py.typed marker.
+To force mypy to analyze these imports you can now set the `--follow-untyped-imports` command line
+flag or the `follow_untyped_imports` config file option to True. This can be set either in the
+global section of your mypy config file, or individually on a per-module basis.
+
+Contributed by Jannick Kremer
+
+List of changes:
+
+ * Implement flag to allow typechecking of untyped modules (Jannick Kremer, PR [17712](https://github.com/python/mypy/pull/17712))
+ * Warn about --follow-untyped-imports (Shantanu, PR [18249](https://github.com/python/mypy/pull/18249))
+
+### Added support for new style TypeVar Defaults (PEP 696)
+
+Mypy now supports TypeVar defaults using the new syntax described in PEP 696, that was introduced in Python 3.13.
+
+```python
+@dataclass
+class Box[T = int]:
+    value: T | None = None
+
+reveal_type(Box())                      # type is Box[int], since it's the default
+reveal_type(Box(value="Hello World!"))  # type is Box[str]
+```
+
+Contributed by Marc Mueller (PR [17985](https://github.com/python/mypy/pull/17985))
+
+### Improved for loop index variable type narrowing
+
+Mypy now preserves the literal type of index expressions until the next assignment to support `TypedDict` lookups.
+
+```python
+from typing import TypedDict
+
+class X(TypedDict):
+    hourly: int
+    daily: int
+
+def func(x: X) -> int:
+    s = 0
+    for var in ("hourly", "daily"):
+        reveal_type(var)  # Revealed type is "Union[Literal['hourly']?, Literal['daily']?]"
+        s += x[var]       # x[var] would previously cause a literal-required error
+    return s
+```
+
+Contributed by Marc Mueller (PR [18014](https://github.com/python/mypy/pull/18014))
+
+### Mypyc Improvements
+
+ * [mypyc] Document optimized bytes ops and additional str ops (Jukka Lehtosalo, PR [18242](https://github.com/python/mypy/pull/18242))
+ * [mypyc] Add primitives and specialization for ord() (Jukka Lehtosalo, PR [18240](https://github.com/python/mypy/pull/18240))
+ * [mypyc] Make exception type check in assertRaises test helper precise (Jukka Lehtosalo, PR [18241](https://github.com/python/mypy/pull/18241))
+ * [mypyc] Optimize str.encode with specializations for common used encodings (Valentin Stanciu, PR [18232](https://github.com/python/mypy/pull/18232))
+ * [mypyc] Refactor: use new-style primitives for unary and method ops (Jukka Lehtosalo, PR [18230](https://github.com/python/mypy/pull/18230))
+ * [mypyc] Fixing condition to fall back to PyCall for staticmethod and classmethod (Advait Dixit, PR [18228](https://github.com/python/mypy/pull/18228))
+ * [mypyc] Refactor: use new-style primitives for unary ops (Jukka Lehtosalo, PR [18213](https://github.com/python/mypy/pull/18213))
+ * [mypyc] Refactor: use new-style primitives for function ops (Jukka Lehtosalo, PR [18211](https://github.com/python/mypy/pull/18211))
+ * [mypyc] Support unicode surrogates in string literals (Jukka Lehtosalo, PR [18209](https://github.com/python/mypy/pull/18209))
+ * [mypyc] Fixing index variable in for-loop with builtins.enumerate. (Advait Dixit, PR [18202](https://github.com/python/mypy/pull/18202))
+ * [mypyc] Fixing check for enum classes. (Advait Dixit, PR [18178](https://github.com/python/mypy/pull/18178))
+ * [mypyc] Loading type from imported modules. (Advait Dixit, PR [18158](https://github.com/python/mypy/pull/18158))
+ * [mypyc] Fix is_native_ref_expr for class attrs (Jared Hance, PR [18031](https://github.com/python/mypy/pull/18031))
+ * [mypyc] fix name generation for modules with similar full names (aatle, PR [18001](https://github.com/python/mypy/pull/18001))
+ * [mypyc] fix relative imports in __init__.py (Shantanu, PR [17979](https://github.com/python/mypy/pull/17979))
+ * [mypyc] Optimize dunder methods (jairov4, PR [17934](https://github.com/python/mypy/pull/17934))
+ * [mypyc] Replace deprecated _PyDict_GetItemStringWithError (Marc Mueller, PR [17930](https://github.com/python/mypy/pull/17930))
+ * [mypyc] Fix wheel build for cp313-win (Marc Mueller, PR [17941](https://github.com/python/mypy/pull/17941))
+ * [mypyc] Use PyGen_GetCode in gen_is_coroutine (Marc Mueller, PR [17931](https://github.com/python/mypy/pull/17931))
+ * [mypyc] Optimize calls to final classes (jairov4, PR [17886](https://github.com/python/mypy/pull/17886))
+ * [mypyc] Support ellipsis (...) expressions in class bodies (Newbyte, PR [17923](https://github.com/python/mypy/pull/17923))
+ * [mypyc] Sync pythoncapi_compat.h (Marc Mueller, PR [17929](https://github.com/python/mypy/pull/17929))
+ * [mypyc] Add "runtests.py mypyc-fast" for running fast mypyc tests (Jukka Lehtosalo, PR [17906](https://github.com/python/mypy/pull/17906))
+ * [mypyc] Make C unit tests faster by compiling with -O0 (Jukka Lehtosalo, PR [17884](https://github.com/python/mypy/pull/17884))
+
+### Stubgen improvements
+
+ * stubgen: do not include mypy generated symbols (Ali Hamdan, PR [18137](https://github.com/python/mypy/pull/18137))
+ * stubgen:  fix FunctionContext.fullname for nested classes (Chad Dombrova, PR [17963](https://github.com/python/mypy/pull/17963))
+ * stubgen: Add flagfile support (Ruslan Sayfutdinov, PR [18061](https://github.com/python/mypy/pull/18061))
+ * stubgen: add support for PEPs 695 and 696 syntax (Ali Hamdan, PR [18054](https://github.com/python/mypy/pull/18054))
+
+### Stubtest improvements
+
+ * allow the use of --show-traceback and --pdb with stubtest (Stephen Morton, PR [18037](https://github.com/python/mypy/pull/18037))
+ * [stubtest] Verify __all__ exists in stub (Sebastian Rittau, PR [18005](https://github.com/python/mypy/pull/18005))
+ * stubtest: Stop telling people to use double underscores (Jelle Zijlstra, PR [17897](https://github.com/python/mypy/pull/17897))
+
+### Documentation Updates
+
+ * Fixed typo in extending mypy docs. (Carlton Gibson, PR [18234](https://github.com/python/mypy/pull/18234))
+ * Update `config_file` docs (sobolevn, PR [18103](https://github.com/python/mypy/pull/18103))
+ * Update for Windows platform. Resolves #18096 (ag-tafe, PR [18097](https://github.com/python/mypy/pull/18097))
+ * Correct note about `--disallow-any-generics` flag in docs (Abel Sen, PR [18055](https://github.com/python/mypy/pull/18055))
+ * Further caution against `--follow-imports=skip` (Shantanu, PR [18048](https://github.com/python/mypy/pull/18048))
+ * [docs] fix broken markup in `type_narrowing.rst` (vasiliy, PR [18028](https://github.com/python/mypy/pull/18028))
+ * [docs] automatic copyright year update (chiri, PR [17982](https://github.com/python/mypy/pull/17982))
+ * [docs] fix the edit page buttton link in docs (Kanishk Pachauri, PR [17933](https://github.com/python/mypy/pull/17933))
+
+### Other Notables Fixes and Improvements
+
+ * Show `Protocol` `__call__` for arguments with incompatible types (MechanicalConstruct, PR [18214](https://github.com/python/mypy/pull/18214))
+ * Make join and meet symmetric with strict_optional (MechanicalConstruct, PR [18227](https://github.com/python/mypy/pull/18227))
+ * Preserve block unreachablility when checking function definitions with constrained TypeVars (Brian Schubert, PR [18217](https://github.com/python/mypy/pull/18217))
+ * Do not include non-init fields in the synthesized `__replace__` method for dataclasses (Victorien, PR [18221](https://github.com/python/mypy/pull/18221))
+ * Disallow `TypeVar` constraints parameterized by type variables (Brian Schubert, PR [18186](https://github.com/python/mypy/pull/18186))
+ * Refactor: merge duplicate HasTypeVars query visitors (Brian Schubert, PR [18222](https://github.com/python/mypy/pull/18222))
+ * Always complain about invalid varargs and varkwargs (Shantanu, PR [18207](https://github.com/python/mypy/pull/18207))
+ * Set default strict_optional state to True (Shantanu, PR [18198](https://github.com/python/mypy/pull/18198))
+ * Preserve typevar default None in type alias (Sukhorosov Aleksey, PR [18197](https://github.com/python/mypy/pull/18197))
+ * Added checks for invalid usage of continue/break/return in except* block (coldwolverine, PR [18132](https://github.com/python/mypy/pull/18132))
+ * Do not consider bare TypeVar not overlapping with None for reachability analysis (Stanislav Terliakov, PR [18138](https://github.com/python/mypy/pull/18138))
+ * Special case types.DynamicClassAttribute as property-like (Stephen Morton, PR [18150](https://github.com/python/mypy/pull/18150))
+ * Disallow bare `ParamSpec` in type aliases (Brian Schubert, PR [18174](https://github.com/python/mypy/pull/18174))
+ * Move long_description metadata to pyproject.toml (Marc Mueller, PR [18172](https://github.com/python/mypy/pull/18172))
+ * Support `==`-based narrowing of Optional (Christoph Tyralla, PR [18163](https://github.com/python/mypy/pull/18163))
+ * Allow TypedDict assignment of Required item to NotRequired ReadOnly item (Brian Schubert, PR [18164](https://github.com/python/mypy/pull/18164))
+ * Allow nesting of Annotated with TypedDict special forms inside TypedDicts (Brian Schubert, PR [18165](https://github.com/python/mypy/pull/18165))
+ * Infer generic type arguments for slice expressions (Brian Schubert, PR [18160](https://github.com/python/mypy/pull/18160))
+ * Fix checking of match sequence pattern against bounded type variables (Brian Schubert, PR [18091](https://github.com/python/mypy/pull/18091))
+ * Fix incorrect truthyness for Enum types and literals (David Salvisberg, PR [17337](https://github.com/python/mypy/pull/17337))
+ * Move static project metadata to pyproject.toml (Marc Mueller, PR [18146](https://github.com/python/mypy/pull/18146))
+ * Fallback to stdlib json if integer exceeds 64-bit range (q0w, PR [18148](https://github.com/python/mypy/pull/18148))
+ * Fix `OR` pattern structural matching exhaustiveness (yihong, PR [18119](https://github.com/python/mypy/pull/18119))
+ * Fix type inference of positional parameter in class pattern involving builtin subtype (Brian Schubert, PR [18141](https://github.com/python/mypy/pull/18141))
+ * Fix [override] error with no line number when argument node has no line number (Brian Schubert, PR [18122](https://github.com/python/mypy/pull/18122))
+ * Fix typos in `generics.rst` (yihong, PR [18110](https://github.com/python/mypy/pull/18110))
+ * Fix couple crashes in dmypy (Ivan Levkivskyi, PR [18098](https://github.com/python/mypy/pull/18098))
+ * Fix subtyping between Instance and Overloaded (Shantanu, PR [18102](https://github.com/python/mypy/pull/18102))
+ * Clean up new_semantic_analyzer config (Shantanu, PR [18071](https://github.com/python/mypy/pull/18071))
+ * Issue warning for enum with no members in stub (Shantanu, PR [18068](https://github.com/python/mypy/pull/18068))
+ * Fix enum attributes are not members (Terence Honles, PR [17207](https://github.com/python/mypy/pull/17207))
+ * Fix crash when checking slice expression with step 0 in tuple index (Brian Schubert, PR [18063](https://github.com/python/mypy/pull/18063))
+ * Allow union-with-callable attributes to be overridden by methods (Brian Schubert, PR [18018](https://github.com/python/mypy/pull/18018))
+ * Emit `[mutable-override]` for covariant override of attribute with method (Brian Schubert, PR [18058](https://github.com/python/mypy/pull/18058))
+ * Support ParamSpec mapping with functools.partial (Stanislav Terliakov, PR [17355](https://github.com/python/mypy/pull/17355))
+ * Fix approved stub ignore, remove normpath (Shantanu, PR [18045](https://github.com/python/mypy/pull/18045))
+ * Make `disallow-any-unimported` flag invertible (Séamus Ó Ceanainn, PR [18030](https://github.com/python/mypy/pull/18030))
+ * Filter to possible package paths before trying to resolve a module (falsedrow, PR [18038](https://github.com/python/mypy/pull/18038))
+ * Refactor type narrowing further (Jukka Lehtosalo, PR [18043](https://github.com/python/mypy/pull/18043))
+ * Refactor "==" and "is" type narrowing logic (Jukka Lehtosalo, PR [18042](https://github.com/python/mypy/pull/18042))
+ * Fix overlap check for ParamSpec types (Jukka Lehtosalo, PR [18040](https://github.com/python/mypy/pull/18040))
+ * Do not prioritize ParamSpec signatures during overload resolution (Stanislav Terliakov, PR [18033](https://github.com/python/mypy/pull/18033))
+ * Fix ternary union for literals (Ivan Levkivskyi, PR [18023](https://github.com/python/mypy/pull/18023))
+ * Fix compatibility checks for conditional function definitions using decorators (Brian Schubert, PR [18020](https://github.com/python/mypy/pull/18020))
+ * Add timeout-minutes to ci config (Marc Mueller, PR [18003](https://github.com/python/mypy/pull/18003))
+ * TypeGuard should be bool not Any when matching TypeVar (Evgeniy Slobodkin, PR [17145](https://github.com/python/mypy/pull/17145))
+ * Fix cache-convert (Shantanu, PR [17974](https://github.com/python/mypy/pull/17974))
+ * Fix generator comprehension in meet.py (Shantanu, PR [17969](https://github.com/python/mypy/pull/17969))
+ * fix crash issue when using shadowfile with pretty #17853 (Max Chang, PR [17894](https://github.com/python/mypy/pull/17894))
+ * [PEP 695] Fix multiple nested classes don't work (Max Chang, PR [17820](https://github.com/python/mypy/pull/17820))
+ * Better error for `mypy -p package` without py.typed (Joe Gordon, PR [17908](https://github.com/python/mypy/pull/17908))
+ * Emit error for "raise NotImplemented" (Brian Schubert, PR [17890](https://github.com/python/mypy/pull/17890))
+ * Add is_lvalue attribute to AttributeContext (Brian Schubert, PR [17881](https://github.com/python/mypy/pull/17881))
+
+### Acknowledgements
+
+Thanks to all mypy contributors who contributed to this release:
+
+- aatle
+- Abel Sen
+- Advait Dixit
+- ag-tafe
+- Alex Waygood
+- Ali Hamdan
+- Brian Schubert
+- Carlton Gibson
+- Chad Dombrova
+- Chelsea Durazo
+- chiri
+- Christoph Tyralla
+- coldwolverine
+- David Salvisberg
+- Ekin Dursun
+- Evgeniy Slobodkin
+- falsedrow
+- Gaurav Giri
+- Ihor
+- Ivan Levkivskyi
+- jairov4
+- Jannick Kremer
+- Jelle Zijlstra
+- jhance
+- jianghuyiyuan
+- Joe Gordon
+- John Doknjas
+- Jukka Lehtosalo
+- Kanishk Pachauri
+- Marc Mueller
+- Max Chang
+- MechanicalConstruct
+- Newbyte
+- q0w
+- Ruslan Sayfutdinov
+- Sebastian Rittau
+- Shantanu
+- sobolevn
+- Stanislav Terliakov
+- Stephen Morton
+- Sukhorosov Aleksey
+- Séamus Ó Ceanainn
+- Terence Honles
+- Valentin Stanciu
+- vasiliy
+- Victorien
+- yihong
+
+I’d also like to thank my employer, Dropbox, for supporting mypy development.
+
 
 ## Mypy 1.13