GitHub - pytest-dev/pluggy: A minimalist production ready plugin system (original) (raw)

pluggy - A minimalist production ready plugin system

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

Please read the docs to learn more!

A definitive example

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]

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.