pytest-dev/pluggy

==================================================== pluggy - A minimalist production ready plugin system

|pypi| |conda-forge| |versions| |github-actions| |gitter| |black| |codecov|

This is the core framework used by the pytest, tox, and devpi_ projects.

Please read the docs_ to learn more!

A definitive example

.. code-block:: python

import pluggy

hookspec = pluggy.HookspecMarker("myproject")
hookimpl = pluggy.HookimplMarker("myproject")


class MySpec:
    """A hook specification namespace."""

    @hookspec
    def myhook(self, arg1, arg2):
        """My special little hook that you can customize."""


class Plugin_1:
    """A hook implementation namespace."""

    @hookimpl
    def myhook(self, arg1, arg2):
        print("inside Plugin_1.myhook()")
        return arg1 + arg2


class Plugin_2:
    """A 2nd hook implementation namespace."""

    @hookimpl
    def myhook(self, arg1, arg2):
        print("inside Plugin_2.myhook()")
        return arg1 - arg2


# create a manager and add the spec
pm = pluggy.PluginManager("myproject")
pm.add_hookspecs(MySpec)

# register plugins
pm.register(Plugin_1())
pm.register(Plugin_2())

# call our ``myhook`` hook
results = pm.hook.myhook(arg1=1, arg2=2)
print(results)

Running this directly gets us::

$ python docs/examples/toy-example.py
inside Plugin_2.myhook()
inside Plugin_1.myhook()
[-1, 3]

.. badges

.. |pypi| image:: https://img.shields.io/pypi/v/pluggy.svg :target: https://pypi.org/pypi/pluggy

.. |versions| image:: https://img.shields.io/pypi/pyversions/pluggy.svg :target: https://pypi.org/pypi/pluggy

.. |github-actions| image:: https://github.com/pytest-dev/pluggy/workflows/test/badge.svg :target: https://github.com/pytest-dev/pluggy/actions

.. |conda-forge| image:: https://img.shields.io/conda/vn/conda-forge/pluggy.svg :target: https://anaconda.org/conda-forge/pytest

.. |gitter| image:: https://badges.gitter.im/pytest-dev/pluggy.svg :alt: Join the chat at https://gitter.im/pytest-dev/pluggy :target: https://gitter.im/pytest-dev/pluggy?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge

.. |black| image:: https://img.shields.io/badge/code%20style-black-000000.svg :target: https://github.com/psf/black

.. |codecov| image:: https://codecov.io/gh/pytest-dev/pluggy/branch/main/graph/badge.svg :target: https://codecov.io/gh/pytest-dev/pluggy :alt: Code coverage Status

.. links .. _pytest: https://pytest.org .. _tox: https://tox.wiki/ .. _devpi: https://doc.devpi.net .. _read the docs: https://pluggy.readthedocs.io/en/latest/

Support pluggy

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.

pluggy is part of the pytest-dev project, see more details in the pytest collective_.

.. _Open Collective: https://opencollective.com .. _pytest collective: https://opencollective.com/pytest