• c48217e Release 7.3.0
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Mypy Release Notes

Next Release

Mypy 1.17

We’ve just uploaded mypy 1.17 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.

Optionally Check That Match Is Exhaustive

Mypy can now optionally generate an error if a match statement does not match exhaustively, without having to use assert_never(...). Enable this by using --enable-error-code exhaustive-match.

Example:

# mypy: enable-error-code=exhaustive-match
import enum
class Color(enum.Enum):
RED = 1
BLUE = 2
def show_color(val: Color) -> None:
# error: Unhandled case for values of type "Literal[Color.BLUE]"
match val:
case Color.RED:
print("red")

This feature was contributed by Donal Burns (PR 19144).

Further Improvements to Attribute Resolution

This release includes additional improvements to how attribute types and kinds are resolved. These fix many bugs and overall improve consistency.

• Handle corner case: protocol/class variable/descriptor (Ivan Levkivskyi, PR 19277)
• Fix a few inconsistencies in protocol/type object interactions (Ivan Levkivskyi, PR 19267)
• Refactor/unify access to static attributes (Ivan Levkivskyi, PR 19254)
• Remove inconsistencies in operator handling (Ivan Levkivskyi, PR 19250)
• Make protocol subtyping more consistent (Ivan Levkivskyi, PR 18943)

... (truncated)

• 0260991 Update version string
• 3901aa2 Updates to 1.17 changelog (#19436)
• 7d13396 Initial changelog for 1.17 release (#19427)
• a182dec Combine the revealed types of multiple iteration steps in a more robust manne...
• ab4fd57 Improve the handling of "iteration dependent" errors and notes in finally cla...
• 09ba1f6 [mypyc] Fix exception swallowing in async try/finally blocks with await (#19353)
• 5c65e33 [mypyc] Fix AttributeError in async try/finally with mixed return paths (#19361)
• 934ec50 Lessen dmypy suggest path limitations for Windows machines (#19337)
• a4801f9 Type ignore comments erroneously marked as unused by dmypy (#15043)
• c3bfa0d Handle corner case: protocol vs classvar vs descriptor (#19277)
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8.4.1

pytest 8.4.1 (2025-06-17)

Bug fixes

• #13461: Corrected _pytest.terminal.TerminalReporter.isatty to support being called as a method. Before it was just a boolean which could break correct code when using -o log_cli=true).

• #13477: Reintroduced pytest.PytestReturnNotNoneWarning{.interpreted-text role="class"} which was removed by accident in pytest [8.4]{.title-ref}.

  This warning is raised when a test functions returns a value other than None, which is often a mistake made by beginners.

  See return-not-none{.interpreted-text role="ref"} for more information.

• #13497: Fixed compatibility with Twisted 25+.

Improved documentation

• #13492: Fixed outdated warning about faulthandler not working on Windows.

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.

... (truncated)

• 8d99211 Prepare release version 8.4.1
• 5dc5880 docs: update pytest.ini addopts example to use separate -p entries (#13529) (...
• d0c7ed0 Reintroduce PytestReturnNotNoneWarning (#13495) (#13527)
• a1b3a78 Fix compatibility with Twisted 25 (#13502) (#13531)
• 4c161ab pytester: avoid unraisableexception gc collects in inline runs to speed up te...
• a86ee09 Fix typo in parametrize.rst (#13514) (#13516)
• 1a0581b Remove outdated warning about faulthandler_timeout on Windows (#13492) (#13493)
• 4e631a7 Merge pull request #13486 from hosmir/fixtypo (#13487)
• b49745e fix: support TerminalReporter.isatty being called (#13462) (#13483)
• cc5ceed RELEASING: remove pytest mailing list (#13472) (#13473)
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Hypothesis for Python - version 6.136.3

When a test is executed concurrently from multiple threads, "DeadlineExceeded" is now disabled, since the Python runtime may decide to switch away from a thread for longer than "settings.deadline", and Hypothesis cannot track execution time per- thread. See issue #4478.

The canonical version of these notes (with links) is on readthedocs.

Hypothesis for Python - version 6.136.2

"@​precondition" now errors if used without "@​rule" or "@​invariant". Doing so has no effect and is indicative of a user error (issue #4413).

The canonical version of these notes (with links) is on readthedocs.

Hypothesis for Python - version 6.136.1

Fix "on_observation()" being called with observations it wasn't responsible for generating if the test failed.

The canonical version of these notes (with links) is on readthedocs.

Hypothesis for Python - version 6.136.0

When a failure found by an alternative backend does not reproduce under the Hypothesis backend, we now raise "FlakyBackendFailure" instead of an internal "FlakyReplay" exception.

The canonical version of these notes (with links) is on readthedocs.

Hypothesis for Python - version 6.135.33

Speculative fix for a thread-safety issue in calculating strategy labels.

The canonical version of these notes (with links) is on readthedocs.

Hypothesis for Python - version 6.135.32

Improve the thread-safety of strategy validation.

Before this release, Hypothesis did not require that "super().init()" be called in "SearchStrategy" subclasses. Subclassing "SearchStrategy" is not supported or part of the public API, but if you are subclassing it anyway, you will need to make sure to call "super().init()" after this release.

The canonical version of these notes (with links) is on readthedocs.

Hypothesis for Python - version 6.135.31

Fix a remaining thread-safety issue with the deprecation warning for use of the global random instance (see v6.135.24).

... (truncated)

• c93b505 Bump hypothesis-python version to 6.136.3 and update changelog
• 4732ecb Merge pull request #4480 from tybug/free-threading-deadline
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• 75a1a93 cap a slow test
• 4d9fd69 disable DeadlineExceeded on multithreading
• c84572e Bump hypothesis-python version to 6.136.2 and update changelog
• 852fe83 Merge pull request #4479 from tybug/stateful-error
• 371b7fd add covering test
• 48e9972 address review, use better qualname
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