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This PR contains the following updates:
25.1.0→26.3.05.9.3→6.1.48.4.2→9.0.2Release Notes
psf/black (black)
v26.3.0Compare Source
Stable style
# type: ignorecomments would be merged with othercomments on the same line, preventing AST equivalence failures (#4888)
Preview style
ifguards incaseblocks were incorrectly split when the pattern hada trailing comma (#4884)
string_processingcrashing on unassigned long string literals with trailingcommas (one-item tuples) (#4929)
Packaging
frozen environments (#4930)
Performance
uvloop.install()in favor ofuvloop.new_event_loop()(#4996)
maybe_install_uvloopfunction tomaybe_use_uvloopto simplify loopinstallation and creation of either a uvloop/winloop evenloop or default eventloop
(#4996)
Output
version, since AST safety checks cannot parse newer syntax. Also replace the
misleading "INTERNAL ERROR" message with an actionable error explaining the version
mismatch (#4983)
Blackd
windows when winloop is installed. (#4996)
Integrations
blackrequirements in the GitHub Action whenuse_pyprojectisenabled so that only version specifiers are accepted and direct references such as
black @​ https://...are rejected. Users should upgrade to the latest version of theaction as soon as possible. This update is received automatically when using
psf/black@stable, and is independent of the version of Black installed by theaction. (#5031)
Documentation
wrap_comprehension_in,simplify_power_operator_hugging, andwrap_long_dict_values_in_parensfeatures(#4987)
v26.1.0Compare Source
Highlights
Introduces the 2026 stable style (#4892), stabilizing the following changes:
always_one_newline_after_import: Always force one blank line after importstatements, except when the line after the import is a comment or an import statement
(#4489)
fix_fmt_skip_in_one_liners: Fix# fmt: skipbehavior on one-liner declarations,such as
def foo(): return "mock" # fmt: skip, where previously the declaration wouldhave been incorrectly collapsed (#4800)
fix_module_docstring_detection: Fix module docstrings being treated as normalstrings if preceded by comments (#4764)
fix_type_expansion_split: Fix type expansions split in generic functions (#4777)multiline_string_handling: Make expressions involving multiline strings more compact(#1879)
normalize_cr_newlines: Add\rstyle newlines to the potential newlines tonormalize file newlines both from and to (#4710)
remove_parens_around_except_types: Remove parentheses around multiple exceptiontypes in
exceptandexcept*withoutas(#4720)remove_parens_from_assignment_lhs: Remove unnecessary parentheses from the left-handside of assignments while preserving magic trailing commas and intentional multiline
formatting (#4865)
standardize_type_comments: Format type comments which have zero or more spacesbetween
#andtype:or betweentype:and value to# type: (value)(#4645)The following change was not in any previous stable release:
_width_table.pyand added tests for the Khmer language (#4253)This release alo bumps
pathspecto v1 and fixes inconsistencies with Git's.gitignorelogic (#4958). Now, files will be ignored if a pattern matches them, evenif the parent directory is directly unignored. For example, Black would previously
format
exclude/not_this/foo.pywith this.gitignore:Now,
exclude/not_this/foo.pywill remain ignored. To ensureexclude/not_this/andall of it's children are included in formatting (and in Git), use this
.gitignore:This new behavior matches Git. The leading
*/are only necessary if you wish to ignorematching subdirectories (like the previous behavior did), and not just matching root
directories.
Output
Integrations
v25.12.0Compare Source
Highlights
Stable style
# fmt: off/# fmt: onblocks were incorrectlyremoved, particularly affecting Jupytext's
# %% [markdown]comments (#4845)# fmt: skipcomments are used in a multi-part if-clause, onstring literals, or on dictionary entries with long lines (#4872)
fmt:directives aren't on the top level (#4856)Preview style
fmt: skipskipping the line after instead of the line it's on (#4855)magic trailing commas and intentional multiline formatting (#4865)
fix_fmt_skip_in_one_linerscrashing onwithstatements (#4853)fix_fmt_skip_in_one_linerscrashing on annotated parameters (#4854)# fmt: skipon them (#4894)Packaging
Integrations
output-fileinput to GitHub Actionpsf/blackto write formatter output to afile for artifact capture and log cleanliness (#4824)
v25.11.0Compare Source
Highlights
Stable style
# fmt: offand# fmt: onwere reformatted (#4811)being normalized (#4811)
Preview style
multiline_string_handlingfrom--unstableto--preview(#4760)comments (#4764)
# type: <value>(#4645)fix_fmt_skip_in_one_linerspreview feature to respect# fmt: skipfor compoundstatements with semicolon-separated bodies (#4800)
Configuration
no_cacheoption to control caching behavior. (#4803)Packaging
Output
(#4610)
Blackd
requests to blackd (#4774)
Integrations
psf/blackto support therequired-versionmajor-version-only"stability" format when using pyproject.toml (#4770)
v25.9.0Compare Source
Highlights
await/asyncas soft keywords/variable names(#4676)
Stable style
delstatement containing tuples (#4628)withstatements (#4630)
# fmt: skipfollowed by a comment at the end of file (#4635)asclause of awithstatement (#4634)withstatement (#4646)\followed by a\rfollowed by a comment (#4663)\\r\n(#4673)await ...(where...is a literalEllipsis) (#4676)(#4670)
Preview style
# fmt: skipwould stillbe formatted (#4552)
multiline_string_handlingwith ternaries and dictionaries (#4657)string_processingwould not split f-strings directly afterexpressions (#4680)
inclause of comprehensions across lines if necessary (#4699)exceptandexcept*withoutas. (#4720)\rstyle newlines to the potential newlines to normalize file newlines both fromand to (#4710)
Parser
parameter bounds and defaults. (#4602)
Performance
Integrations
psf/blackto read Black version from an additional section inpyproject.toml:
[project.dependency-groups](#4606)Documentation
pytest-dev/pyfakefs (pyfakefs)
v6.1.4Compare Source
Fixes incompatibility with VCCode unittest runner.
Fixes
(see #1289)
(see #1285)
v6.1.3Compare Source
Minor bugfix release.
Fixes
(see #1289)
v6.1.2Compare Source
Fixes a regression caused by the introduced weakrefs.
Fixes
(see #1284)
v6.1.1Compare Source
Fixes a packaging issue in latest version.
Fixes
(see #1278)
v6.1.0Compare Source
Changes back-link references to weak references.
Changes
this may have unwanted consequences (crashes) for some untested workflows
Infrastructure
pyproject.tomlfor dependencies, movedtoxconfiguration intopyproject.tomlFixes
sizefrom aFakeFileWrapperobject(see #1276)
readableraising an error on a file object.(see #1265)
(see #1267)
v6.0.0Compare Source
Removes some deprecated functionality, removes support for Python < 3.10.
Breaking Changes
pyfakefs5.10supporting older versions may be made on demand
scandirandpathlib2FakeFilesystem.shuffle_listdir_resultstoTrueto reflectthe real filesystem behavior
Changes
Fixes
Pathtype hints using the pipe symbol in wrapped functionsinside an
fsdependent fixture (see #1242)coveragein Python 3.14 using the fake filesystem(see #1245)
Documentation
Infrastructure
v5.10.2Compare Source
Fixes a problem with
pathlib.globin Python 3.14.Fixes
pathlib.glob()for Python 3.14 (see #1239)v5.10.1Compare Source
Fixes a regression introduced in version 5.9.0.
Fixes
shutil.copytreeif copying using anshutilfunction ascopy_functionargument (see #1235)v5.10.0Compare Source
Adds official support for Python 3.14. Last minor version before the 6.0 release.
Changes
errnocodes set inOSErrorhave changed for some specific error conditionsin Windows 11/Windows Server 2025; pyfakefs now matches this behavior
instead of the previous behavior under Windows 10
Enhancements
os.readintoin Python 3.14pathlib.copyandpathlib.copy_intoin Python 3.14Fixes
tempfilein Python 3.13 (see #1214)pytest-dev/pytest (pytest)
v9.0.2Compare Source
pytest 9.0.2 (2025-12-06)
Bug fixes
#13896: The terminal progress feature added in pytest 9.0.0 has been disabled by default, except on Windows, due to compatibility issues with some terminal emulators.
You may enable it again by passing
-p terminalprogress. We may enable it by default again once compatibility improves in the future.Additionally, when the environment variable
TERMisdumb, the escape codes are no longer emitted, even if the plugin is enabled.#13904: Fixed the TOML type of the
tmp_path_retention_countsettings in the API reference from number to string.#13946: The private
config.inicfgattribute was changed in a breaking manner in pytest 9.0.0.Due to its usage in the ecosystem, it is now restored to working order using a compatibility shim.
It will be deprecated in pytest 9.1 and removed in pytest 10.
#13965: Fixed quadratic-time behavior when handling
unittestsubtests in Python 3.10.Improved documentation
pytest's command-line flags <command-line-flags>.v9.0.1Compare Source
pytest 9.0.1 (2025-11-12)
Bug fixes
raise unittest.SkipTest.Packaging updates and notes for downstreams
version string can be passed into its
package_envthroughthe
SETUPTOOLS_SCM_PRETEND_VERSION_FOR_PYTESTenvironmentvariable as a part of the release process -- by
webknjaz.Contributor-facing changes
creating GitHub Releases without having a Git checkout on
disk -- by
bluetechandwebknjaz.version string can be passed into its
package_envthroughthe
SETUPTOOLS_SCM_PRETEND_VERSION_FOR_PYTESTenvironmentvariable as a part of the release process -- by
webknjaz.v9.0.0Compare Source
pytest 9.0.0 (2025-11-05)
New features
#1367: Support for subtests has been added.
subtests <subtests>are an alternative to parametrization, useful in situations where the parametrization values are not all known at collection time.Example:
Each assert failure or error is caught by the context manager and reported individually, giving a clear picture of all files that are missing a docstring.
In addition,
unittest.TestCase.subTestis now also supported.This feature was originally implemented as a separate plugin in pytest-subtests, but since then has been merged into the core.
#13743: Added support for native TOML configuration files.
While pytest, since version 6, supports configuration in
pyproject.tomlfiles under[tool.pytest.ini_options],it does so in an "INI compatibility mode", where all configuration values are treated as strings or list of strings.
Now, pytest supports the native TOML data model.
In
pyproject.toml, the native TOML configuration is under the[tool.pytest]table.The
[tool.pytest.ini_options]table remains supported, but both tables cannot be used at the same time.If you prefer to use a separate configuration file, or don't use
pyproject.toml, you can usepytest.tomlor.pytest.toml:The documentation now (sometimes) shows configuration snippets in both TOML and INI formats, in a tabbed interface.
See
config file formatsfor full details.#13823: Added a "strict mode" enabled by the
strictconfiguration option.When set to
true, thestrictoption currently enablesstrict_configstrict_markersstrict_parametrization_idsstrict_xfailThe individual strictness options can be explicitly set to override the global
strictsetting.The previously-deprecated
--strictcommand-line flag now enables strict mode.If pytest adds new strictness options in the future, they will also be enabled in strict mode.
Therefore, you should only enable strict mode if you use a pinned/locked version of pytest,
or if you want to proactively adopt new strictness options as they are added.
See
strict modefor more details.#13737: Added the
strict_parametrization_idsconfiguration option.When set, pytest emits an error if it detects non-unique parameter set IDs,
rather than automatically making the IDs unique by adding 0, 1, ... to them.
This can be particularly useful for catching unintended duplicates.
#13072: Added support for displaying test session progress in the terminal tab using the OSC 9;4; ANSI sequence.
When pytest runs in a supported terminal emulator like ConEmu, Gnome Terminal, Ptyxis, Windows Terminal, Kitty or Ghostty,
you'll see the progress in the terminal tab or window,
allowing you to monitor pytest's progress at a glance.
This feature is automatically enabled when running in a TTY. It is implemented as an internal plugin. If needed, it can be disabled as follows:
-p no:terminalprogresson the command line or via an environment variablePYTEST_ADDOPTS='-p no:terminalprogress'.addopts = "-p no:terminalprogress".#478: Support PEP420 (implicit namespace packages) as --pyargs target when
consider_namespace_packagesis true in the config.Previously, this option only impacted package imports, now it also impacts tests discovery.
#13678: Added a new
faulthandler_exit_on_timeoutconfiguration option set to "false" by default to let faulthandler interrupt the pytest process after a timeout in case of deadlock.Previously, a faulthandler timeout would only dump the traceback of all threads to stderr, but would not interrupt the pytest process.
-- by
ogrisel.#13829: Added support for configuration option aliases via the
aliasesparameter inParser.addini() <pytest.Parser.addini>.Plugins can now register alternative names for configuration options,
allowing for more flexibility in configuration naming and supporting backward compatibility when renaming options.
The canonical name always takes precedence if both the canonical name and an alias are specified in the configuration file.
Improvements in existing functionality
#13330: Having pytest configuration spread over more than one file (for example having both a
pytest.inifile andpyproject.tomlwith a[tool.pytest.ini_options]table) will now print a warning to make it clearer to the user that only one of them is actually used.-- by
sgaist#13574: The single argument
--versionno longer loads the entire plugin infrastructure, making it faster and more reliable when displaying only the pytest version.Passing
--versiontwice (e.g.,pytest --version --version) retains the original behavior, showing both the pytest version and plugin information.#13823: Added
strict_xfailas an alias to thexfail_strictoption,strict_configas an alias to the--strict-configflag,and
strict_markersas an alias to the--strict-markersflag.This makes all strictness options consistently have configuration options with the prefix
strict_.#13700: --junitxml no longer prints the generated xml file summary at the end of the pytest session when --quiet is given.
#13732: Previously, when filtering warnings, pytest would fail if the filter referenced a class that could not be imported. Now, this only outputs a message indicating the problem.
#13859: Clarify the error message for pytest.raises() when a regex match fails.
#13861: Better sentence structure in a test's expected error message. Previously, the error message would be "expected exception must be <expected>, but got <actual>". Now, it is "Expected <expected>, but got <actual>".
Removals and backward incompatible breaking changes
#12083: Fixed a bug where an invocation such as pytest a/ a/b would cause only tests from a/b to run, and not other tests under a/.
The fix entails a few breaking changes to how such overlapping arguments and duplicates are handled:
If you rely on these behaviors, consider using
--keep-duplicates <duplicate-paths>, which retains its existing behavior (including the bug).#13719: Support for Python 3.9 is dropped following its end of life.
#13766: Previously, pytest would assume it was running in a CI/CD environment if either of the environment variables $CI or $BUILD_NUMBER was defined;
now, CI mode is only activated if at least one of those variables is defined and set to a non-empty value.
#13779: PytestRemovedIn9Warning deprecation warnings are now errors by default.
Following our plan to remove deprecated features with as little disruption as
possible, all warnings of type
PytestRemovedIn9Warningnow generate errorsinstead of warning messages by default.
The affected features will be effectively removed in pytest 9.1, so please consult the
deprecationssection in the docs for directions on how to update existing code.In the pytest
9.0.Xseries, it is possible to change the errors back into warnings as astopgap measure by adding this to your
pytest.inifile:But this will stop working when pytest
9.1is released.If you have concerns about the removal of a specific feature, please add a
comment to
13779.Deprecations (removal in next major release)
monkeypatch.syspath_prepend() <pytest.MonkeyPatch.syspath_prepend>now issues a deprecation warning when the prepended path contains legacy namespace packages (those usingpkg_resources.declare_namespace()).Users should migrate to native namespace packages (
420).See
monkeypatch-fixup-namespace-packagesfor details.Bug fixes
#13445: Made the type annotations of
pytest.skipand friends more spec-complaint to have them work across more type checkers.#13537: Fixed a bug in which
ExceptionGroupwith onlySkippedexceptions in teardown was not handled correctly and showed as error.#13598: Fixed possible collection confusion on Windows when short paths and symlinks are involved.
#13716: Fixed a bug where a nonsensical invocation like
pytest x.py[a](a file cannot be parametrized) was silently treated aspytest x.py. This is now a usage error.#13722: Fixed a misleading assertion failure message when using
pytest.approxon mappings with differing lengths.#13773: Fixed the static fixture closure calculation to properly consider transitive dependencies requested by overridden fixtures.
#13816: Fixed
pytest.approxwhich now returns a clearer error message when comparing mappings with different keys.#13849: Hidden
.pytest.inifiles are now picked up as the config file even if empty.This was an inconsistency with non-hidden
pytest.ini.#13865: Fixed --show-capture with --tb=line.
#13522: Fixed
pytesterin subprocess mode ignored all :attr`pytester.plugins <pytest.Pytester.plugins>` except the first.Fixed
pytesterin subprocess mode silently ignored non-strpytester.plugins <pytest.Pytester.plugins>.Now it errors instead.
If you are affected by this, specify the plugin by name, or switch the affected tests to use
pytester.runpytest_inprocess <pytest.Pytester.runpytest_inprocess>explicitly instead.Packaging updates and notes for downstreams
iniconfigandpackagingwere bumped to1.0.1and22.0.0, respectively.Contributor-facing changes
lsofcommand hanging (e.g. due to unreachable network filesystems), with the affected selftests being skipped after 10 seconds.gh pr newcommand inscripts/prepare-release-pr.py.The script now uses
gh pr createwhich is compatible with GitHub CLI v2.0+.ogrisel.tox>=4is now required when contributing to pytest.pytest_addoption(),pytest_configure(), andcacheshow()functions incacheprovider.py.Miscellaneous internal changes
-o/--override-ini) are now processed during startup rather than duringconfig.getini() <pytest.Config.getini>.Configuration
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