qml_repro_code.py

import pyblish.api
import pyblish_maya


class DummyCollector(pyblish.api.ContextPlugin):
    order = pyblish.api.CollectorOrder
    label = 'Dummy Collector'

    def process(self, context):
        print('DUMMY COLLECTOR')
        context.create_instance(name='dummy', family='dummy')


class DummyValidator(pyblish.api.InstancePlugin):
    order = pyblish.api.ValidatorOrder
    label = 'Dummy Validator'

    def process(self, instance):
        print('DUMMY VALIDATOR')
        raise RuntimeError('No')


class DummyExtractor(pyblish.api.InstancePlugin):
    order = pyblish.api.ExtractorOrder
    label = 'Dummy Extractor'

    def process(self, instance):
        print('DUMMY EXTRACTOR')


pyblish.api.deregister_all_plugins()
pyblish.api.register_plugin(DummyCollector)
pyblish.api.register_plugin(DummyValidator)
pyblish.api.register_plugin(DummyExtractor)


pyblish.api.register_gui('pyblish_qml')
pyblish_maya.show()