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

|pypi| |conda-forge| |versions| |github-actions| |travis| |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/main/badge.svg :target: https://github.com/pytest-dev/pluggy/actions

.. |travis| image:: https://img.shields.io/travis/pytest-dev/pluggy/master.svg :target: https://travis-ci.org/pytest-dev/pluggy

.. |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/ambv/black

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

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