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Various updates to changelog for 1.10 (#17158)
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JukkaL committed Apr 23, 2024
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Expand Up @@ -12,64 +12,121 @@ We’ve just uploaded mypy 1.10 to the Python Package Index ([PyPI](https://pypi

You can read the full documentation for this release on [Read the Docs](http://mypy.readthedocs.io).

**TODO**
- Implement TypeIs (PEP 742) (Jelle Zijlstra, PR [16898](https://github.com/python/mypy/pull/16898))
- Error handling for recursive TypeVar defaults (PEP 696) (Marc Mueller, PR [16925](https://github.com/python/mypy/pull/16925))
- Add basic support for recursive TypeVar defaults (PEP 696) (Marc Mueller, PR [16878](https://github.com/python/mypy/pull/16878))
#### Support TypeIs (PEP 742)

#### Other Notable Changes and Fixes
- fix: incorrect returned type of access descriptors on unions of types (Matthieu Devlin, PR [16604](https://github.com/python/mypy/pull/16604))
- Fix crash when expanding invalid Unpack in a `Callable` alias (Ali Hamdan, PR [17028](https://github.com/python/mypy/pull/17028))
- Fix string formatting for string enums (roberfi, PR [16555](https://github.com/python/mypy/pull/16555))
- Narrow individual items when matching a tuple to a sequence pattern (Loïc Simon, PR [16905](https://github.com/python/mypy/pull/16905))
- Add TypeGuard and TypeIs traversing in TypeTraverserVisitor (Evgeniy Slobodkin, PR [17071](https://github.com/python/mypy/pull/17071))
- Improve error message for bound typevar in TypeAliasType (Ali Hamdan, PR [17053](https://github.com/python/mypy/pull/17053))
- Fix TypedDict init from Type with optional keys (Marc Mueller, PR [17068](https://github.com/python/mypy/pull/17068))
- Improve yield from inference for unions of generators (Shantanu, PR [16717](https://github.com/python/mypy/pull/16717))
- Support `TypeAliasType` in a class scope (Ali Hamdan, PR [17038](https://github.com/python/mypy/pull/17038))
- attrs: Fix emulating hash method logic (Hashem, PR [17016](https://github.com/python/mypy/pull/17016))
- Use lower-case generics more consistently in error messages (Jukka Lehtosalo, PR [17035](https://github.com/python/mypy/pull/17035))
- Revert "Revert use of `ParamSpec` for `functools.wraps`" (Tamir Duberstein, PR [16942](https://github.com/python/mypy/pull/16942))
- Support `TypeAliasType` (Ali Hamdan, PR [16926](https://github.com/python/mypy/pull/16926))
- Fix type narrowing for types.EllipsisType (Shantanu, PR [17003](https://github.com/python/mypy/pull/17003))
- Disallow all super calls to methods with trivial bodies (Shantanu, PR [16756](https://github.com/python/mypy/pull/16756))
- Fix single item enum match type exhaustion (Oskari Lehto, PR [16966](https://github.com/python/mypy/pull/16966))
- Fix inference with UninhabitedType (Marc Mueller, PR [16994](https://github.com/python/mypy/pull/16994))
- Allow TypedDict initialization from Type (Marc Mueller, PR [16963](https://github.com/python/mypy/pull/16963))
- Fix override checking for decorated property (Shantanu, PR [16856](https://github.com/python/mypy/pull/16856))
- Fix duplicate word in protocols.rst (hesam, PR [16950](https://github.com/python/mypy/pull/16950))
- Workaround parenthesised context manager issue (Shantanu, PR [16949](https://github.com/python/mypy/pull/16949))
- Fix narrowing on match with function subject (Edward Paget, PR [16503](https://github.com/python/mypy/pull/16503))
- Allow inferring +int to be a Literal (Spencer Brown, PR [16910](https://github.com/python/mypy/pull/16910))
Mypy now supports `TypeIs` ([PEP 742](https://peps.python.org/pep-0742/)), which allows
functions to narrow the type of a value, similar to `isinstance()`. Unlike `TypeGuard`,
`TypeIs` can narrow in both the `if` and `else` branches of an if statement:

#### Stubgen Improvements
- stubgen: Preserve empty tuple annotation (Ali Hamdan, PR [16907](https://github.com/python/mypy/pull/16907))
- stubgen: Add support for PEP 570 positional-only parameters (Ali Hamdan, PR [16904](https://github.com/python/mypy/pull/16904))
- stubgen: Replace obsolete typing aliases with builtin containers (Ali Hamdan, PR [16780](https://github.com/python/mypy/pull/16780))
- stubgen: Fix generated dataclass `__init__` signature (Ali Hamdan, PR [16906](https://github.com/python/mypy/pull/16906))
```python
from typing_extensions import TypeIs

#### Stubtest Improvements
- stubtest: correct type annotations in _Arguments (Sam Xifaras, PR [16897](https://github.com/python/mypy/pull/16897))
def is_str(s: object) -> TypeIs[str]:
return isinstance(s, str)

def f(o: str | int) -> None:
if is_str(o):
# Type of o is 'str'
...
else:
# Type of o is 'int'
...
```

`TypeIs` will be added to the `typing` module in Python 3.13, but it
can be used on earlier Python versions by importing it from
`typing_extensions`.

This feature was contributed by Jelle Zijlstra (PR [16898](https://github.com/python/mypy/pull/16898)).

#### Support TypeVar Defaults (PEP 696)

[PEP 696](https://peps.python.org/pep-0696/) adds support for type parameter defaults.
Example:

```python
from typing import Generic
from typing_extensions import TypeVar

T = TypeVar("T", default=int)

class C(Generic[T]):
...

x: C = ...
y: C[str] = ...
reveal_type(x) # C[int], because of the default
reveal_type(y) # C[str]
```

TypeVar defaults will be added to the `typing` module in Python 3.13, but they
can be used with earlier Python releases by importing `TypeVar` from
`typing_extensions`.

This feature was contributed by Marc Mueller (PR [16878](https://github.com/python/mypy/pull/16878)
and PR [16925](https://github.com/python/mypy/pull/16925)).

#### Detect Additional Unsafe Uses of super()

Mypy will reject unsafe uses of `super()` more consistently, when the target has a
trivial (empty) body. Example:

```python
class Proto(Protocol):
def method(self) -> int: ...

class Sub(Proto):
def method(self) -> int:
return super().meth() # Error (unsafe)
```

This feature was contributed by Shantanu (PR [16756](https://github.com/python/mypy/pull/16756)).

#### Stubgen Improvements
- Preserve empty tuple annotation (Ali Hamdan, PR [16907](https://github.com/python/mypy/pull/16907))
- Add support for PEP 570 positional-only parameters (Ali Hamdan, PR [16904](https://github.com/python/mypy/pull/16904))
- Replace obsolete typing aliases with builtin containers (Ali Hamdan, PR [16780](https://github.com/python/mypy/pull/16780))
- Fix generated dataclass `__init__` signature (Ali Hamdan, PR [16906](https://github.com/python/mypy/pull/16906))

#### Mypyc Improvements
- [mypyc] Refactor: add two list primitive ops (Jukka Lehtosalo, PR [17058](https://github.com/python/mypy/pull/17058))
- [mypyc] Refactor: use primitive op for initializing list item (Jukka Lehtosalo, PR [17056](https://github.com/python/mypy/pull/17056))
- [mypyc] Refactor: move tagged int related code to mypyc.lower.int_ops (Jukka Lehtosalo, PR [17052](https://github.com/python/mypy/pull/17052))
- [mypyc] Implement lowering for remaining tagged integer comparisons (Jukka Lehtosalo, PR [17040](https://github.com/python/mypy/pull/17040))
- [mypyc] Implement lowering pass and add primitives for int (in)equality (Jukka Lehtosalo, PR [17027](https://github.com/python/mypy/pull/17027))
- [mypyc] Optimize away some bool/bit registers (Jukka Lehtosalo, PR [17022](https://github.com/python/mypy/pull/17022))
- [mypyc] Provide an easier way to define IR-to-IR transforms (Jukka Lehtosalo, PR [16998](https://github.com/python/mypy/pull/16998))
- [mypyc] Remangle redefined names produced by async with (Richard Si, PR [16408](https://github.com/python/mypy/pull/16408))
- [mypyc] Optimize TYPE_CHECKING to False at Runtime (Srinivas Lade, PR [16263](https://github.com/python/mypy/pull/16263))
- [mypyc] Fix compilation of unreachable comprehensions (Richard Si, PR [15721](https://github.com/python/mypy/pull/15721))
- [mypyc] Don't crash on non-inlinable final local reads (Richard Si, PR [15719](https://github.com/python/mypy/pull/15719))

- Provide an easier way to define IR-to-IR transforms (Jukka Lehtosalo, PR [16998](https://github.com/python/mypy/pull/16998))
- Implement lowering pass and add primitives for int (in)equality (Jukka Lehtosalo, PR [17027](https://github.com/python/mypy/pull/17027))
- Implement lowering for remaining tagged integer comparisons (Jukka Lehtosalo, PR [17040](https://github.com/python/mypy/pull/17040))
- Optimize away some bool/bit registers (Jukka Lehtosalo, PR [17022](https://github.com/python/mypy/pull/17022))
- Remangle redefined names produced by async with (Richard Si, PR [16408](https://github.com/python/mypy/pull/16408))
- Optimize TYPE_CHECKING to False at Runtime (Srinivas Lade, PR [16263](https://github.com/python/mypy/pull/16263))
- Fix compilation of unreachable comprehensions (Richard Si, PR [15721](https://github.com/python/mypy/pull/15721))
- Don't crash on non-inlinable final local reads (Richard Si, PR [15719](https://github.com/python/mypy/pull/15719))
- Support `TypeAliasType` (Ali Hamdan, PR [16926](https://github.com/python/mypy/pull/16926))

#### Documentation Improvements
- Update running_mypy.rst add closing bracket (Roman Solomatin, PR [17046](https://github.com/python/mypy/pull/17046))
- Docs: docstrings in checker.py, ast_helpers.py (Ihor, PR [16908](https://github.com/python/mypy/pull/16908))
- docs: Add missing ClassVar import (youkaichao, PR [16962](https://github.com/python/mypy/pull/16962))
- Docs: Update `TypedDict` import statements (Riccardo Di Maio, PR [16958](https://github.com/python/mypy/pull/16958))
- Docs: adding missing `mutable-override` to section title (James Braza, PR [16886](https://github.com/python/mypy/pull/16886))
- Import `TypedDict` from `typing` instead of `typing_extensions` (Riccardo Di Maio, PR [16958](https://github.com/python/mypy/pull/16958))
- Add missing `mutable-override` to section title (James Braza, PR [16886](https://github.com/python/mypy/pull/16886))

#### Error Reporting Improvements

- Improve error message for bound TypeVar in TypeAliasType (Ali Hamdan, PR [17053](https://github.com/python/mypy/pull/17053))
- Use lower-case generics more consistently in error messages (Jukka Lehtosalo, PR [17035](https://github.com/python/mypy/pull/17035))

#### Other Notable Changes and Fixes
- Fix incorrect inferred type when accessing descriptor on union type (Matthieu Devlin, PR [16604](https://github.com/python/mypy/pull/16604))
- Fix crash when expanding invalid `Unpack` in a `Callable` alias (Ali Hamdan, PR [17028](https://github.com/python/mypy/pull/17028))
- Fix false positive when string formatting with string enum (roberfi, PR [16555](https://github.com/python/mypy/pull/16555))
- Narrow individual items when matching a tuple to a sequence pattern (Loïc Simon, PR [16905](https://github.com/python/mypy/pull/16905))
- Fix false positive from type variable within TypeGuard or TypeIs (Evgeniy Slobodkin, PR [17071](https://github.com/python/mypy/pull/17071))
- Improve `yield from` inference for unions of generators (Shantanu, PR [16717](https://github.com/python/mypy/pull/16717))
- Support `TypeAliasType` in a class scope (Ali Hamdan, PR [17038](https://github.com/python/mypy/pull/17038))
- Fix emulating hash method logic in `attrs` classes (Hashem, PR [17016](https://github.com/python/mypy/pull/17016))
- Add reverted typeshed commit that uses `ParamSpec` for `functools.wraps` (Tamir Duberstein, PR [16942](https://github.com/python/mypy/pull/16942))
- Fix type narrowing for `types.EllipsisType` (Shantanu, PR [17003](https://github.com/python/mypy/pull/17003))
- Fix single item enum match type exhaustion (Oskari Lehto, PR [16966](https://github.com/python/mypy/pull/16966))
- Improve type inference with empty collections (Marc Mueller, PR [16994](https://github.com/python/mypy/pull/16994))
- Fix override checking for decorated property (Shantanu, PR [16856](https://github.com/python/mypy/pull/16856))
- Fix narrowing on match with function subject (Edward Paget, PR [16503](https://github.com/python/mypy/pull/16503))
- Allow `+N` within `Literal[...]` (Spencer Brown, PR [16910](https://github.com/python/mypy/pull/16910))
- Experimental: Support TypedDict within `type[...]` (Marc Mueller, PR [16963](https://github.com/python/mypy/pull/16963))
- Experimtental: Fix issue with TypedDict with optional keys in `type[...]` (Marc Mueller, PR [17068](https://github.com/python/mypy/pull/17068))

#### Acknowledgements
Thanks to all mypy contributors who contributed to this release:
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