This is the core framework used by the pytest, tox, and devpi projects.
Please read the docs to learn more!
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]
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pluggy is part of the pytest-dev project, see more details in the pytest collective.