krita-plugins/bleed_generator_docker/__init__.py

from krita import DockWidgetFactory, DockWidgetFactoryBase
from .bleed_generator_docker import BleedGenerator

DOCKER_ID = 'bleed_generator'
instance = Krita.instance()
dock_widget_factory = DockWidgetFactory(DOCKER_ID,
                                        DockWidgetFactoryBase.DockRight,
                                        BleedGenerator)

instance.addDockWidgetFactory(dock_widget_factory)