krita-plugins/bs_pnp_expander_docker/__init__.py

from krita import DockWidgetFactory, DockWidgetFactoryBase
from .bs_pnp_expander_docker import BsPnpExpander

DOCKER_ID = 'bs_pnp_expander'
instance = Krita.instance()
dock_widget_factory = DockWidgetFactory(DOCKER_ID,
                                        DockWidgetFactoryBase.DockRight,
                                        BsPnpExpander)

instance.addDockWidgetFactory(dock_widget_factory)