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Description:

pluggy 1.5.0

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]

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