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pytest documentation contents menu expand light mode dark mode auto light dark in light mode auto light dark in dark mode skip to content pytest documentation get started how to guides how to invoke pytest how to write and report assertions in tests how to use fixtures how to mark test functions with attributes how to parametrize fixtures and test functions how to use subtests how to use temporary directories and files in tests how to monkeypatch mock modules and environments how to run doctests how to re run failed tests and maintain state between test runs how to handle test failures managing pytest s output how to manage logging how to capture stdout stderr output how to capture warnings how to use skip and xfail to deal with tests that cannot succeed how to install and use plugins writing plugins writing hook functions how to use pytest with an existing test suite how to use unittest based tests with pytest how to implement xunit style set up how to set up bash completion reference guides api reference fixtures reference configuration exit codes pytest plugin list explanation anatomy of a test about fixtures good integration practices pytest import mechanisms and sys path pythonpath typing in pytest ci pipelines flaky tests examples and customization tricks demo of python failure reports with pytest basic patterns and examples parametrizing tests working with custom markers a session fixture which can look at all collected tests changing standard python test discovery working with non python tests using a custom directory collector about the project changelog contributing backwards compatibility policy history python version support sponsor pytest for enterprise license contact channels useful links pytest pypi pytest github issue tracker pdf documentation back to top next open trainings and events professional testing with python via python academy 3 day in depth training march 3th 5th 2026 leipzig de remote also see previous talks and blogposts pytest helps you write better programs the pytest framework makes it easy to write small readable tests and can scale to support complex functional testing for applications and libraries pypi package name pytest a quick example content of test_sample py def inc x return x 1 def test_answer assert inc 3 5 to execute it pytest test session starts platform linux python 3 x y pytest 9 x y pluggy 1 x y rootdir home sweet project collected 1 item test_sample py f 100 failures _______________________________ test_answer ________________________________ def test_answer assert inc 3 5 e assert 4 5 e where 4 inc 3 test_sample py 6 assertionerror short test summary info failed test_sample py test_answer assert 4 5 1 failed in 0 12s due to pytest s detailed assertion introspection only plain assert statements are used see get started for a basic introduction to using pytest features detailed info on failing assert statements no need to remember self assert names auto discovery of test modules and functions modular fixtures for managing small or parametrized long lived test resources can run unittest including trial test suites out of the box python 3 10 or pypy 3 rich plugin architecture with over 1300 external plugins and thriving community documentation get started install pytest and grasp its basics in just twenty minutes how to guides step by step guides covering a vast range of use cases and needs reference guides includes the complete pytest api reference lists of plugins and more explanation background discussion of key topics answers to higher level questions bugs requests please use the github issue tracker to submit bugs or request features support pytest open collective is an online funding platform for open and transparent communities it provides tools to raise money and share your finances in full transparency it is the platform of choice for individuals and companies that want to make one time or monthly donations directly to the project see more details in the pytest collective pytest for enterprise available as part of the tidelift subscription the maintainers of pytest and thousands of other packages are working with tidelift to deliver commercial support and maintenance for the open source dependencies you use to build your applications save time reduce risk and improve code health while paying the maintainers of the exact dependencies you use learn more security pytest has never been associated with a security vulnerability but in any case to report a security vulnerability please use the tidelift security contact tidelift will coordinate the fix and disclosure next get started copyright 2015 holger krekel and pytest dev team made with sphinx and pradyunsg s furo on this page pytest helps you write better programs a quick example features documentation bugs requests support pytest pytest for enterprise security