Sourced from pytest's releases.

8.4.0

pytest 8.4.0 (2025-06-02)

Removals and backward incompatible breaking changes

• #11372: Async tests will now fail, instead of warning+skipping, if you don't have any suitable plugin installed.

• #12346: Tests will now fail, instead of raising a warning, if they return any value other than None.

• #12874: We dropped support for Python 3.8 following its end of life (2024-10-07).

• #12960: Test functions containing a yield now cause an explicit error. They have not been run since pytest 4.0, and were previously marked as an expected failure and deprecation warning.

  See the docs <yield tests deprecated>{.interpreted-text role="ref"} for more information.

Deprecations (removal in next major release)

• #10839: Requesting an asynchronous fixture without a [pytest_fixture_setup]{.title-ref} hook that resolves it will now give a DeprecationWarning. This most commonly happens if a sync test requests an async fixture. This should have no effect on a majority of users with async tests or fixtures using async pytest plugins, but may affect non-standard hook setups or autouse=True. For guidance on how to work around this warning see sync-test-async-fixture{.interpreted-text role="ref"}.

New features

• #11538: Added pytest.RaisesGroup{.interpreted-text role="class"} as an equivalent to pytest.raises{.interpreted-text role="func"} for expecting ExceptionGroup{.interpreted-text role="exc"}. Also adds pytest.RaisesExc{.interpreted-text role="class"} which is now the logic behind pytest.raises{.interpreted-text role="func"} and used as parameter to pytest.RaisesGroup{.interpreted-text role="class"}. RaisesGroup includes the ability to specify multiple different expected exceptions, the structure of nested exception groups, and flags for emulating except* <except_star>{.interpreted-text role="ref"}. See assert-matching-exception-groups{.interpreted-text role="ref"} and docstrings for more information.

• #12081: Added capteesys{.interpreted-text role="fixture"} to capture AND pass output to next handler set by --capture=.

• #12504: pytest.mark.xfail{.interpreted-text role="func"} now accepts pytest.RaisesGroup{.interpreted-text role="class"} for the raises parameter when you expect an exception group. You can also pass a pytest.RaisesExc{.interpreted-text role="class"} if you e.g. want to make use of the check parameter.

• #12713: New [--force-short-summary]{.title-ref} option to force condensed summary output regardless of verbosity level.

  This lets users still see condensed summary output of failures for quick reference in log files from job outputs, being especially useful if non-condensed output is very verbose.

• #12749: pytest traditionally collects classes/functions in the test module namespace even if they are imported from another file.

  For example:

  # contents of src/domain.py
  class Testament: ...
  contents of tests/test_testament.py
  from domain import Testament
  def test_testament(): ...

  In this scenario with the default options, pytest will collect the class [Testament]{.title-ref} from [tests/test_testament.py]{.title-ref} because it starts with [Test]{.title-ref}, even though in this case it is a production class being imported in the test module namespace.

  This behavior can now be prevented by setting the new collect_imported_tests{.interpreted-text role="confval"} configuration option to false, which will make pytest collect classes/functions from test files only if they are defined in that file.

... (truncated)

• 315b3ae Prepare release version 8.4.0
• 1498ba3 Merge pull request #13467 from pytest-dev/towncrier-create
• e4389ac Remove resultlog from the docs (#13465)
• 64b2301 scripts/release: add missing build to towncrier call
• 4c205cf testing/plugins_integration: update Django (#13463)
• 4dcbcc9 Merge pull request #13458 from pytest-dev/dup-param-error
• 5293016 Merge pull request #13459 from pytest-dev/pyright-minor-fixes
• 7a48181 Add pyright configuration
• 9fc6db9 pytester: avoid confusing x self parameter
• 9aa198b mark/expression: fix self -> cls
• Additional commits viewable in compare view

• 39c9c08 Merge branch 'release-1.38.28'
• bec8e8d Bumping version to 1.38.28
• 2b03000 Update endpoints model
• 44d1891 Update to latest models
• 6b32855 Track retry mode and gzip feature ids (#3481)
• 994a156 Merge branch 'release-1.38.27'
• 7deb27e Merge branch 'release-1.38.27' into develop
• ff2e580 Bumping version to 1.38.27
• 9ac3725 Update endpoints model
• 261a369 Update to latest models
• Additional commits viewable in compare view

• 5c3ba07 Merge branch 'release-1.38.28'
• 22f6c5a Bumping version to 1.38.28
• b6a84ba Add changelog entries from botocore
• ccacc66 Merge branch 'release-1.38.27'
• 65ee8e3 Merge branch 'release-1.38.27' into develop
• 531a41c Bumping version to 1.38.27
• 47419ec Add changelog entries from botocore
• 173e2b4 Merge branch 'release-1.38.26'
• 62b7d27 Merge branch 'release-1.38.26' into develop
• 99ba763 Bumping version to 1.38.26
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Sourced from mypy's changelog.

Mypy Release Notes

Next Release

Mypy 1.16

We’ve just uploaded mypy 1.16 to the Python Package Index (PyPI). 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.

Different Property Getter and Setter Types

Mypy now supports using different types for a property getter and setter:

class A:
    _value: int
@property
def foo(self) -> int:
    return self._value
@foo.setter
def foo(self, x: str | int) -> None:
try:
self._value = int(x)
except ValueError:
raise Exception(f"'{x}' is not a valid value for 'foo'")

This was contributed by Ivan Levkivskyi (PR 18510).

Flexible Variable Redefinitions (Experimental)

Mypy now allows unannotated variables to be freely redefined with different types when using the experimental --allow-redefinition-new flag. You will also need to enable --local-partial-types. Mypy will now infer a union type when different types are assigned to a variable:

# mypy: allow-redefinition-new, local-partial-types
def f(n: int, b: bool) -> int | str:
if b:
x = n
else:
</tr></table>

... (truncated)

• 9e72e96 Update version to 1.16.0
• 8fe719f Add changelog for 1.16 (#19138)
• 2a036e7 Revert "Infer correct types with overloads of Type[Guard | Is] (#19161)
• b6da4fc Allow enum members to have type objects as values (#19160)
• 334469f [mypyc] Improve documentation of native and non-native classes (#19154)
• a499d9f Document --allow-redefinition-new (#19153)
• 96525a2 Merge commit '9e45dadcf6d8dbab36f83d9df94a706c0b4f9207' into release-1.16
• 9e45dad Clear more data in TypeChecker.reset() instead of asserting (#19087)
• 772cd0c Add --strict-bytes to --strict (#19049)
• 0b65f21 Admit that Final variables are never redefined (#19083)
• Additional commits viewable in compare view

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