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The pytest framework makes it easy to write small tests, yet scales to support complex functional testing

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framework makes it easy to write small tests, yet scales to support complex functional testing for applications and libraries.

An example of a simple test:

.. code-block:: python

# content of
def inc(x):
    return x + 1

def test_answer(): assert inc(3) == 5

To execute it::

$ pytest
============================= test session starts =============================
collected 1 items F

================================== FAILURES =================================== _________________________________ test_answer _________________________________

def test_answer():

> assert inc(3) == 5 E assert 4 == 5 E + where 4 = inc(3) AssertionError ========================== 1 failed in 0.04 seconds ===========================

Due to

's detailed assertion introspection, only plain
statements are used. See
_ for more examples.


  • Detailed info on failing

    assert statements 
    _ (no need to remember
  • Auto-discovery
    _ of test modules and functions
  • Modular fixtures 
    _ for managing small or parametrized long-lived test resources
  • Can run

    _ (or trial),
    _ test suites out of the box
  • Python 3.6+ and PyPy3

  • Rich plugin architecture, with over 850+

    external plugins 
    _ and thriving community


For full documentation, including installation, tutorials and PDF documents, please see


Please use the

GitHub issue tracker 
_ to submit bugs or request features.


Consult the

__ page for fixes and enhancements of each version.

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

.. _Open Collective: .. _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.


Copyright Holger Krekel and others, 2004-2021.

Distributed under the terms of the

_ license, pytest is free and open source software.

.. _


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