Sign inDemoInstall


Package Overview
File Explorer

Install Socket

Detect and block malicious and high-risk dependencies



pytest: simple powerful testing with Python



.. image:: :target: :align: center :height: 200 :alt: pytest

.. image:: :target:

.. image:: :target:

.. image:: :target:

.. image:: :target: :alt: Code coverage Status

.. image:: :target:

.. image:: :target: :alt: status

.. image:: :target:

.. image:: :target: :alt: Documentation Status

.. image:: :target: :alt: Discord

.. image:: :target: :alt: Libera chat

The pytest 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 pytest's detailed assertion introspection, only plain assert statements are used. See getting-started <>_ for more examples.


  • 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 <>_ (or trial) test suites out of the box

  • Python 3.8+ or PyPy3

  • Rich plugin architecture, with over 1300+ 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 Changelog <>__ 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.

Distributed under the terms of the MIT_ license, pytest is free and open source software.

.. _MIT:



Did you know?

Socket for GitHub automatically highlights issues in each pull request and monitors the health of all your open source dependencies. Discover the contents of your packages and block harmful activity before you install or update your dependencies.


Related posts

SocketSocket SOC 2 Logo


  • Package Alerts
  • Integrations
  • Docs
  • Pricing
  • FAQ
  • Roadmap

Stay in touch

Get open source security insights delivered straight into your inbox.

  • Terms
  • Privacy
  • Security

Made with ⚡️ by Socket Inc