basabuuka_prototyp/venv/lib/python3.5/site-packages/scrapy/extension.py

"""
The Extension Manager

See documentation in docs/topics/extensions.rst
"""
from scrapy.middleware import MiddlewareManager
from scrapy.utils.conf import build_component_list

class ExtensionManager(MiddlewareManager):

    component_name = 'extension'

    @classmethod
    def _get_mwlist_from_settings(cls, settings):
        return build_component_list(settings.getwithbase('EXTENSIONS'))