Sourced from [mypy's changelog](https://github.com/python/mypy/blob/master/CHANGELOG.md).

Mypy Release Notes

Next release

Mypy 1.10

We’ve just uploaded mypy 1.10 to the Python Package Index ([PyPI](https://pypi.org/project/mypy/)). Mypy is a static type checker for Python. This release includes new features, performance improvements 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).

Support TypeIs (PEP 742)

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:

from typing_extensions import TypeIs
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://redirect.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:

from typing import Generic
from typing_extensions import TypeVar
</tr></table>

... (truncated)

• 3faf0fc Remove +dev for version for release 1.10
• a5998d2 Update CHANGELOG.md ([#17159](https://redirect.github.com/Update CHANGELOG.md python/mypy#17159))
• 62ea5b0 Various updates to changelog for 1.10 ([#17158](https://redirect.github.com/Various updates to changelog for 1.10 python/mypy#17158))
• 2f0864c Update CHANGELOG.md with draft for release 1.10 ([#17150](https://redirect.github.com/Update CHANGELOG.md with draft for release 1.10 python/mypy#17150))
• e1443bb fix: incorrect returned type of access descriptors on unions of types ([#16604](https://redirect.github.com/fix: incorrect returned type of access descriptors on unions of types python/mypy#16604))
• 5161ac2 Sync typeshed ([#17124](https://redirect.github.com/Sync typeshed python/mypy#17124))
• e2fc1f2 Fix crash when expanding invalid Unpack in a Callable alias ([#17028](https://redirect.github.com/Fix crash when expanding invalid Unpack in a Callable alias python/mypy#17028))
• 3ff6e47 Docs: docstrings in checker.py, ast_helpers.py ([#16908](https://redirect.github.com/Docs: Docstrings in checker.py, ast_helpers.py python/mypy#16908))
• 732d98e Fix string formatting for string enums ([#16555](https://redirect.github.com/Fix string formatting for string enums python/mypy#16555))
• 8019010 Narrow individual items when matching a tuple to a sequence pattern ([#16905](https://redirect.github.com/Narrow individual items when matching a tuple to a sequence pattern python/mypy#16905))
• Additional commits viewable in [compare view](https://github.com/python/mypy/compare/1.9.0...v1.10.0)

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