How to smartly define objects that are commonly used in View

class RootResource(object):
    u"""Application Root Resource
Since Traversal is not used, it is passed to View as context as it is.
    """

    __name__ = None
    __parent__ = None
    __acl__ = []

    def __init__(self, request):
        self._repos = {
            'user': UserRepository(),
        }

    @property
    def repos(self):
        u"""Each repository is provided via a dictionary"""
        return self._repos

config = Configurator(
    settings=settings,
    root_factory="foo.resource.RootResource"
)

@view_config(route_name="user_detail")
def user_detail(context, request):
    user_repo = context.repos['user']
    user = user_repo.getById(...)
    return ...

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