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JukkaL committed Oct 7, 2024
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Expand Up @@ -14,41 +14,46 @@ You can read the full documentation for this release on [Read the Docs](http://m

### Support Python 3.12 Syntax for Generics (PEP 695)

Support for the new type parameter syntax introduced in 3.12 is now enabled by default.
Support for the new type parameter syntax introduced in 3.12 is now enabled by default,
documented, and no longer experimental. It was available through a feature flag in
mypy 1.11 as an experimental feature.

These improvements are included:

* [PEP 695] Further documentation updates (Jukka Lehtosalo, PR [17826](https://github.com/python/mypy/pull/17826))
* [PEP 695] Document Python 3.12 type parameter syntax (Jukka Lehtosalo, PR [17816](https://github.com/python/mypy/pull/17816))
* [PEP 695] Allow Self return types with contravariance (Jukka Lehtosalo, PR [17786](https://github.com/python/mypy/pull/17786))
* [PEP 695] Enable new type parameter syntax by default (Jukka Lehtosalo, PR [17798](https://github.com/python/mypy/pull/17798))
* [PEP 695] Generate error if new-style type alias used as base class (Jukka Lehtosalo, PR [17789](https://github.com/python/mypy/pull/17789))
* [PEP 695] Inherit variance if base class has explicit variance (Jukka Lehtosalo, PR [17787](https://github.com/python/mypy/pull/17787))
* [PEP 695] Fix crash on invalid type var reference (Jukka Lehtosalo, PR [17788](https://github.com/python/mypy/pull/17788))
* [PEP 695] Fix covariance of frozen dataclasses (Jukka Lehtosalo, PR [17783](https://github.com/python/mypy/pull/17783))
* [PEP 695] Allow covariance with attribute that has "_" name prefix (Jukka Lehtosalo, PR [17782](https://github.com/python/mypy/pull/17782))
* [PEP 695] Support Annotated[...] in new-style type aliases (Jukka Lehtosalo, PR [17777](https://github.com/python/mypy/pull/17777))
* [PEP 695] Fix nested generic classes (Jukka Lehtosalo, PR [17776](https://github.com/python/mypy/pull/17776))
* PEP 695: Add detection and error reporting for the use of incorrect expressions within the scope of a type parameter and a type alias (Kirill Podoprigora, PR [17560](https://github.com/python/mypy/pull/17560))
* Document Python 3.12 type parameter syntax (Jukka Lehtosalo, PR [17816](https://github.com/python/mypy/pull/17816))
* Further documentation updates (Jukka Lehtosalo, PR [17826](https://github.com/python/mypy/pull/17826))
* Allow Self return types with contravariance (Jukka Lehtosalo, PR [17786](https://github.com/python/mypy/pull/17786))
* Enable new type parameter syntax by default (Jukka Lehtosalo, PR [17798](https://github.com/python/mypy/pull/17798))
* Generate error if new-style type alias used as base class (Jukka Lehtosalo, PR [17789](https://github.com/python/mypy/pull/17789))
* Inherit variance if base class has explicit variance (Jukka Lehtosalo, PR [17787](https://github.com/python/mypy/pull/17787))
* Fix crash on invalid type var reference (Jukka Lehtosalo, PR [17788](https://github.com/python/mypy/pull/17788))
* Fix covariance of frozen dataclasses (Jukka Lehtosalo, PR [17783](https://github.com/python/mypy/pull/17783))
* Allow covariance with attribute that has "`_`" name prefix (Jukka Lehtosalo, PR [17782](https://github.com/python/mypy/pull/17782))
* Support `Annotated[...]` in new-style type aliases (Jukka Lehtosalo, PR [17777](https://github.com/python/mypy/pull/17777))
* Fix nested generic classes (Jukka Lehtosalo, PR [17776](https://github.com/python/mypy/pull/17776))
* Add detection and error reporting for the use of incorrect expressions within the scope of a type parameter and a type alias (Kirill Podoprigora, PR [17560](https://github.com/python/mypy/pull/17560))

### Basic Support for Python 3.13

This release adds compiled binaries for Python 3.13 and partial support for Python 3.13
features. Mypyc also now supports Python 3.13.

These features are supported:
* Various stdlib updates (through typeshed stub improvements)
* Various new stdlib features and changes (through typeshed stub improvements)
* `typing.ReadOnly` (see below for more)
* `typing.TypeIs` (support was added in mypy 1.10)
* Type parameter defaults when using the legacy syntax ([PEP 695](https://peps.python.org/pep-0696/))

These features are not supported yet:
* `warnings.deprecated` ([PEP 702](https://peps.python.org/pep-0702/))
* Type parameter defaults when using Python 3.12 for type parameters
* Type parameter defaults when using Python 3.12 type parameter syntax

### Mypyc Support for Python 3.13

Mypyc now supports Python 3.13. Full list of changes:
Mypyc now supports Python 3.13. This was contributed by Marc Mueller, with additional
fixes by Jukka Lehtosalo. Free threaded Python 3.13 builds are not supported yet.

List of changes:

* Add additional includes for Python 3.13 (Marc Mueller, PR [17506](https://github.com/python/mypy/pull/17506))
* Add another include for Python 3.13 (Marc Mueller, PR [17509](https://github.com/python/mypy/pull/17509))
Expand All @@ -64,79 +69,114 @@ Mypyc now supports Python 3.13. Full list of changes:
* Don't use `_PyUnicode_FastCopyCharacters` on 3.13 (Jukka Lehtosalo, PR [17524](https://github.com/python/mypy/pull/17524))
* Don't use `_PyUnicode_EQ` on 3.13, as it's no longer exported (Jukka Lehtosalo, PR [17523](https://github.com/python/mypy/pull/17523))

### ReadOnly support TypedDict
### Inferring Unions for Conditional Expressions

Mypy now always tries to infer a union type for a conditional expression. This results in
more precise inferred types and lets mypy detect more issues.

Notably, if one of the operands has type `Any`, the type of a conditional expression is
now `<type> | Any`. Previously the inferred type was just `Any`. Example where this is
relevant:

```python
from typing import Any

def func(a: Any, b: bool) -> None:
x = a if b else None
# Type of x is "Any | None"
print(x.y) # Error: None has no attribute "y"
```

This feature was contributed by Ivan Levkivskyi (PR [17427](https://github.com/python/mypy/pull/17427)).

### ReadOnly Support for TypedDict

* Add `ReadOnly` support for TypedDicts (sobolevn, PR [17644](https://github.com/python/mypy/pull/17644))

### Python 3.8 End of Life Approaching

We are planning to drop support for Python 3.8 in the next mypy feature release or the
one after that. Python 3.8 reaches end of life in Octoboer 2024.

### Planned Changes to Defaults

We are planning to enable `--local-partial-types` by default in mypy 2.0. This will
often require at least minor code changes. This option is implicitly enabled by mypy
daemon, so this makes the behavior of daemon and non-daemon modes consistent.

We recommend that mypy users start using local partial types soon (or to explicitly disable
them) to prepare for the change.

This can also be configured in a mypy configuration file:

```
local_partial_types = True
```

For more information, refer to the
[documentation](https://mypy.readthedocs.io/en/stable/command_line.html#cmdoption-mypy-local-partial-types).

### Documentation Updates

Mypy documentation now uses modern syntax variants and imports in many examples. Some
examples no longer work on Python 3.8, which is the earliest Python version that mypy supports.

* Document `--output=json` CLI option (Edgar Ramírez Mondragón, PR [17611](https://github.com/python/mypy/pull/17611))
* Update various references to deprecated type aliases in docs (Jukka Lehtosalo, PR [17829](https://github.com/python/mypy/pull/17829))
* Make "X | Y" union syntax more prominent in documentation (Jukka Lehtosalo, PR [17835](https://github.com/python/mypy/pull/17835))
* Discuss upper bounds before self types in documentation (Jukka Lehtosalo, PR [17827](https://github.com/python/mypy/pull/17827))
* Make changelog visible in mypy documentation (quinn-sasha, PR [17742](https://github.com/python/mypy/pull/17742))
* List all incomplete features in `--enable-incomplete-feature` docs (sobolevn, PR [17633](https://github.com/python/mypy/pull/17633))
* Remove the explicit setting of a pygments theme (Pradyun Gedam, PR [17571](https://github.com/python/mypy/pull/17571))

### Stubgen Improvements

* Fix crash on literal class-level keywords (sobolevn, PR [17663](https://github.com/python/mypy/pull/17663))
* Stubgen add `--version` (sobolevn, PR [17662](https://github.com/python/mypy/pull/17662))
* Fix `stubgen --no-analysis/--parse-only` docs (sobolevn, PR [17632](https://github.com/python/mypy/pull/17632))
* Include keyword only args when generating signatures in stubgenc (Eric Mark Martin, PR [17448](https://github.com/python/mypy/pull/17448))
* Add Literal support for docstrings (Michael Carlstrom, PR [17441](https://github.com/python/mypy/pull/17441))
* Use `Generator` type var defaults (Sebastian Rittau, PR [17670](https://github.com/python/mypy/pull/17670))

### Stubtest Improvements
* Add support for `cached_property` (Ali Hamdan, PR [17626](https://github.com/python/mypy/pull/17626))
* Add `enable_incomplete_feature` validation to `stubtest` (sobolevn, PR [17635](https://github.com/python/mypy/pull/17635))
* Fix error code handling in `stubtest` with `--mypy-config-file` (sobolevn, PR [17629](https://github.com/python/mypy/pull/17629))

### Other Notables Fixes and Improvements

* [PEP 696] Report error if using unsupported type parameter defaults (Jukka Lehtosalo, PR [17876](https://github.com/python/mypy/pull/17876))
* Fix re-processing cross-reference when node kind changes (Ivan Levkivskyi, PR [17883](https://github.com/python/mypy/pull/17883))
* Report error if using unsupported type parameter defaults (Jukka Lehtosalo, PR [17876](https://github.com/python/mypy/pull/17876))
* Fix re-processing cross-reference in mypy daemon when node kind changes (Ivan Levkivskyi, PR [17883](https://github.com/python/mypy/pull/17883))
* Don't use equality to narrow when value is IntEnum/StrEnum (Jukka Lehtosalo, PR [17866](https://github.com/python/mypy/pull/17866))
* Don't consider None vs IntEnum comparison ambiguous (Jukka Lehtosalo, PR [17877](https://github.com/python/mypy/pull/17877))
* Fix narrowing of IntEnum and StrEnum types (Jukka Lehtosalo, PR [17874](https://github.com/python/mypy/pull/17874))
* Filter overload items based on self type during type inference (Jukka Lehtosalo, PR [17873](https://github.com/python/mypy/pull/17873))
* Fix typos in .github/worflows/test.yml (Jukka Lehtosalo, PR [17867](https://github.com/python/mypy/pull/17867))
* Don't use equality to narrow when value is IntEnum/StrEnum (Jukka Lehtosalo, PR [17866](https://github.com/python/mypy/pull/17866))
* Revert "Narrow based on collection containment (#17344)" (Jukka Lehtosalo, PR [17865](https://github.com/python/mypy/pull/17865))
* .git-blame-ignore-revs: add #15059 and #16847 (Brian Schubert, PR [17862](https://github.com/python/mypy/pull/17862))
* Enable negative narrowing of Union TypeVar upper bounds (Brian Schubert, PR [17850](https://github.com/python/mypy/pull/17850))
* Fix tests on latest Python 3.13 (and 3.12) (Shantanu, PR [17849](https://github.com/python/mypy/pull/17849))
* Enable negative narrowing of union TypeVar upper bounds (Brian Schubert, PR [17850](https://github.com/python/mypy/pull/17850))
* Fix get_member_expr_fullname returning strings with embedded "None" (Brian Schubert, PR [17848](https://github.com/python/mypy/pull/17848))
* Avoid type size explosion when expanding types (Jukka Lehtosalo, PR [17842](https://github.com/python/mypy/pull/17842))
* Document `--output=json` CLI option (Edgar Ramírez Mondragón, PR [17611](https://github.com/python/mypy/pull/17611))
* Fix negative narrowing of tuples in match statement (Brian Schubert, PR [17817](https://github.com/python/mypy/pull/17817))
* Make "X | Y" union syntax more prominent in documentation (Jukka Lehtosalo, PR [17835](https://github.com/python/mypy/pull/17835))
* Update various references to deprecated type aliases in docs (Jukka Lehtosalo, PR [17829](https://github.com/python/mypy/pull/17829))
* Discuss upper bounds before self types in documentation (Jukka Lehtosalo, PR [17827](https://github.com/python/mypy/pull/17827))
* Narrow falsey str/bytes/int to literal type (Brian Schubert, PR [17818](https://github.com/python/mypy/pull/17818))
* Test against latest Python 3.13, make testing 3.14 easy (Shantanu, PR [17812](https://github.com/python/mypy/pull/17812))
* Reject ParamSpec-typed callables calls with insufficient arguments (Stanislav Terliakov, PR [17323](https://github.com/python/mypy/pull/17323))
* Copyedit final_attrs.rst (Michael I Chen, PR [17813](https://github.com/python/mypy/pull/17813))
* Fix crash when passing too many type arguments to generic base class accepting single ParamSpec (Brian Schubert, PR [17770](https://github.com/python/mypy/pull/17770))
* Fix TypeVar upper bounds sometimes not being displayed in pretty callables (Brian Schubert, PR [17802](https://github.com/python/mypy/pull/17802))
* Added error code for overlapping function signatures (Katrina Connors, PR [17597](https://github.com/python/mypy/pull/17597))
* Check for `truthy-bool` in `not ...` unary expressions (sobolevn, PR [17773](https://github.com/python/mypy/pull/17773))
* Add missing lines-covered and lines-valid attributes (Soubhik Kumar Mitra, PR [17738](https://github.com/python/mypy/pull/17738))
* Make changelog visible in mypy documentation (quinn-sasha, PR [17742](https://github.com/python/mypy/pull/17742))
* stubgen: Use `Generator` type var defaults (Sebastian Rittau, PR [17670](https://github.com/python/mypy/pull/17670))
* Use newer Python in docs build (Shantanu, PR [17747](https://github.com/python/mypy/pull/17747))
* [nit] conf.py: annotate the type, instead of ignoring the error (wyattscarpenter, PR [17727](https://github.com/python/mypy/pull/17727))
* Fix another crash scenario on recursive tuple types (Ivan Levkivskyi, PR [17708](https://github.com/python/mypy/pull/17708))
* Add optional stderr result to `run_stubtest` in tests (sobolevn, PR [17636](https://github.com/python/mypy/pull/17636))
* [stubgen] Fix crash on literal class-level keywords (sobolevn, PR [17663](https://github.com/python/mypy/pull/17663))
* Stubgen add `--version` (sobolevn, PR [17662](https://github.com/python/mypy/pull/17662))
* stubtest: Add support for cached_property (Ali Hamdan, PR [17626](https://github.com/python/mypy/pull/17626))
* Resolve TypeVar upper bounds in functools.partial (Shantanu, PR [17660](https://github.com/python/mypy/pull/17660))
* Add `enable_incomplete_feature` validation to `stubtest` (sobolevn, PR [17635](https://github.com/python/mypy/pull/17635))
* Fix typo in error_code_list.rst (sobolevn, PR [17645](https://github.com/python/mypy/pull/17645))
* Resolve TypeVar upper bounds in `functools.partial` (Shantanu, PR [17660](https://github.com/python/mypy/pull/17660))
* Always reset binder when checking deferred nodes (Ivan Levkivskyi, PR [17643](https://github.com/python/mypy/pull/17643))
* Fix crash on a callable attribute with single unpack (Ivan Levkivskyi, PR [17641](https://github.com/python/mypy/pull/17641))
* List all incomplete features in `--enable-incomplete-feature` docs (sobolevn, PR [17633](https://github.com/python/mypy/pull/17633))
* Fix `stubgen --no-analysis/--parse-only` docs (sobolevn, PR [17632](https://github.com/python/mypy/pull/17632))
* Fix error code handling in `stubtest` with `--mypy-config-file` (sobolevn, PR [17629](https://github.com/python/mypy/pull/17629))
* fix: Mismatched signature between checker plugin API and implementation (bzoracler, PR [17343](https://github.com/python/mypy/pull/17343))
* Narrow based on collection containment (Jordandev678, PR [17344](https://github.com/python/mypy/pull/17344))
* Remove the explicit setting of a pygments theme (Pradyun Gedam, PR [17571](https://github.com/python/mypy/pull/17571))
* Bump setuptools from 68.2.2 to 70.0.0 (dependabot[bot], PR [17533](https://github.com/python/mypy/pull/17533))
* Fix mismatched signature between checker plugin API and implementation (bzoracler, PR [17343](https://github.com/python/mypy/pull/17343))
* Indexing a type also produces a GenericAlias (Shantanu, PR [17546](https://github.com/python/mypy/pull/17546))
* Experimental: allow inline/anonymous TypedDicts (Ivan Levkivskyi, PR [17457](https://github.com/python/mypy/pull/17457))
* Fix crash on self-type in callable protocol (Ivan Levkivskyi, PR [17499](https://github.com/python/mypy/pull/17499))
* Fix crash on NamedTuple with method and error in function (Ivan Levkivskyi, PR [17498](https://github.com/python/mypy/pull/17498))
* Fix cross-variable type-narrowing example (InSync, PR [17488](https://github.com/python/mypy/pull/17488))
* Run Python 3.13 tests in CI (with failures allowed) (Shantanu, PR [17484](https://github.com/python/mypy/pull/17484))
* Revert "Have namedtuple `__replace__` return `Self`" (Ivan Levkivskyi, PR [17496](https://github.com/python/mypy/pull/17496))
* Refactor: remove temporary `def` from `semanal_classprop.check_protocol_status` (sobolevn, PR [17486](https://github.com/python/mypy/pull/17486))
* Have namedtuple `__replace__` return `Self` (Max Muoto, PR [17475](https://github.com/python/mypy/pull/17475))
* Add `__replace__` for dataclasses in 3.13 (Max Muoto, PR [17469](https://github.com/python/mypy/pull/17469))
* Fix help message for --no-namespace-packages. (Raphael Krupinski, PR [17472](https://github.com/python/mypy/pull/17472))
* Infer unions for ternary expressions (Ivan Levkivskyi, PR [17427](https://github.com/python/mypy/pull/17427))
* Use Python 3.12 for mypy_primer (Shantanu, PR [17456](https://github.com/python/mypy/pull/17456))
* Fix help message for `--no-namespace-packages` (Raphael Krupinski, PR [17472](https://github.com/python/mypy/pull/17472))
* Fix typechecking for async generators (Danny Yang, PR [17452](https://github.com/python/mypy/pull/17452))
* Fix strict optional handling in attrs plugin (Ivan Levkivskyi, PR [17451](https://github.com/python/mypy/pull/17451))
* Include keyword only args when generating signatures in stubgenc (Eric Mark Martin, PR [17448](https://github.com/python/mypy/pull/17448))
* Add Literal support for docstrings (Michael Carlstrom, PR [17441](https://github.com/python/mypy/pull/17441))
* Allow mixing ParamSpec and TypeVarTuple in Generic (Ivan Levkivskyi, PR [17450](https://github.com/python/mypy/pull/17450))
* Fix typo in `error_code_list2.rst` (InSync, PR [17443](https://github.com/python/mypy/pull/17443))

### Typeshed Updates

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