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A flake8 plugin checking common style issues or inconsistencies with pytest-based tests.

Project description


pypi Python: 3.7+ Downloads Build Status Code coverage License: MIT Code style: black


A flake8 plugin checking common style issues or inconsistencies with pytest-based tests.

Currently the following errors are reported:

Code Description
PT001 use @pytest.fixture() over @pytest.fixture
(configurable by pytest-fixture-no-parentheses)
PT002 configuration for fixture '{name}' specified via positional args, use kwargs
PT003 scope='function' is implied in @pytest.fixture()
PT004 fixture '{name}' does not return anything, add leading underscore
PT005 fixture '{name}' returns a value, remove leading underscore
PT006 wrong name(s) type in @pytest.mark.parametrize, expected {expected_type}
(configurable by pytest-parametrize-names-type)
PT007 wrong values type in @pytest.mark.parametrize, expected {expected_type}
(configurable by pytest-parametrize-values-type and pytest-parametrize-values-row-type)
PT008 use return_value= instead of patching with lambda
PT009 use a regular assert instead of unittest-style '{assertion}'
PT010 set the expected exception in pytest.raises()
PT011 pytest.raises({exception}) is too broad, set the match parameter or use a more specific exception
(configurable by pytest-raises-require-match-for)
PT012 pytest.raises() block should contain a single simple statement
PT013 found incorrect import of pytest, use simple 'import pytest' instead
PT014 found duplicate test cases {indexes} in @pytest.mark.parametrize
PT015 assertion always fails, replace with
PT016 no message passed to
PT017 found assertion on exception {name} in except block, use pytest.raises() instead
PT018 assertion should be broken down into multiple parts
PT019 fixture {name} without value is injected as parameter, use @pytest.mark.usefixtures instead
PT020 @pytest.yield_fixture is deprecated, use @pytest.fixture
PT021 use yield instead of request.addfinalizer
PT022 no teardown in fixture {name}, use return instead of yield
PT023 use over
(configurable by pytest-mark-no-parentheses)
PT024 pytest.mark.asyncio is unnecessary for fixtures
PT025 pytest.mark.usefixtures has no effect on fixtures
PT026 useless pytest.mark.usefixtures without parameters
PT027 use pytest.raises() instead of unittest-style '{assertion}'


pip install flake8-pytest-style


The plugin has the following configuration options:

  • pytest-fixture-no-parentheses — see PT001
  • pytest-parametrize-names-type — see PT006
  • pytest-parametrize-values-type — see PT007
  • pytest-parametrize-values-row-type — see PT007
  • pytest-raises-require-match-for — see PT011
  • pytest-mark-no-parentheses — see PT023

For developers

Install deps and setup pre-commit hook

make init

Run linters, autoformat, tests etc.

make format lint test

Bump new version

make bump_major
make bump_minor
make bump_patch



Change Log



1.7.2 - 2023-02-15

  • fix false positive for PT009 on

1.7.1 - 2023-02-15

  • update list of unittest-style assert methods for PT009/PT027

1.7.0 - 2023-02-09

  • require at least Python 3.7.2
  • support Python 3.11
  • add PT027 (checks for unittest-style assertRaises)

1.6.0 - 2021-12-23

  • require at least Python 3.6.2
  • expose py.typed file

1.5.1 - 2021-11-05

  • better wording for PT011
  • support Python 3.10

1.5.0 - 2021-06-18

  • add PT025 (checks for erroneous pytest.mark.usefixtures on fixtures)
  • add PT026 (checks for pytest.mark.usefixtures without parameters)

1.4.4 - 2021-06-17

  • fix PT023 not checking marks in classes
  • fix PT004 incorrectly firing on fixtures with yield from

1.4.2 - 2021-05-24

  • update flake8-plugin-utils version to improve stability

1.4.1 - 2021-04-01

  • fix argparse-related warnings

1.4.0 - 2021-03-14

  • add PT023 (checks for parentheses consistency in pytest.mark usage)
  • add PT024 (checks for unnecessary pytest.mark.asyncio on fixtures)
  • fix PT004, PT005 firing on abstract fixtures
  • fix PT012 firing on with statements containing a single pass

1.3.0 - 2020-08-30

  • add PT022 (checks for yield fixtures without teardown)

1.2.3 - 2020-08-06

  • update flake8-plugin-utils dependency to fix encoding problems on Windows

1.2.2 - 2020-07-23

  • fix PT004/PT005 inspecting returns of nested functions

1.2.1 - 2020-06-15

  • fix PT021 for factory fixtures (#46)

1.2.0 - 2020-06-12

  • support scoped mocker fixtures from pytest-mock for PT008
  • check for positional-only lambda arguments in PT008
  • add PT020 (checks for pytest.yield_fixture)
  • add PT021 (checks for request.addfinalizer)
  • add documentation pages for all rules

1.1.1 - 2020-04-17

  • fix PT011 not reporting match='' as a violation

1.1.0 - 2020-04-14

  • add PT015 (checks for assert False)
  • add PT016 (checks for without message)
  • add PT017 (checks for assertions on exceptions in except blocks)
  • add PT018 (checks for composite assertions)
  • add PT019 (checks for fixtures without value injected as parameters)

1.0.0 - 2020-03-26

  • add PT014 (checks for duplicate test cases in @pytest.mark.parametrize)

0.6.0 - 2020-03-21

  • add configuration option pytest-parametrize-names-type for PT006
  • add configuration options pytest-parametrize-values-type and pytest-parametrize-values-row-type for PT007

0.5.0 - 2020-03-09

  • add configuration option pytest-fixture-no-parentheses for PT001
  • add PT013 (checks for from-imports from pytest)

0.4.0 - 2020-03-09

  • add PT012 (checks for multiple statements in with pytest.raises())

0.3.1 - 2020-03-09

  • fix default value of pytest-raises-require-match-for config option

0.3.0 - 2020-03-09

  • add PT010 and PT011 (checks for pytest.raises parameters)

0.2.0 - 2020-03-01

0.1.3 - 2019-05-24

  • add yield fixtures support
  • fix changelog entry for 0.1.2

0.1.2 - 2019-05-23

  • fix parametrize checkers not working in decorators

0.1.1 - 2019-05-23

  • update PyPI description

0.1.0 - 2019-05-23

  • initial

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