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svalentin committed Dec 18, 2024
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## 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.
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
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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)

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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))
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* 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))
* Improve for loop index variable type narrowing (Marc Mueller, PR [18014](https://github.com/python/mypy/pull/18014))
* 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))
* Add initial support for new style TypeVar defaults (PEP 696) (Marc Mueller, PR [17985](https://github.com/python/mypy/pull/17985))
* 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))
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