How to use the safety.app_settings function in safety

from django.core.urlresolvers import reverse, reverse_lazy
from django.views.decorators.cache import never_cache
from django.views.decorators.csrf import csrf_protect
from django.views.decorators.debug import sensitive_post_parameters
from django.views.generic import ListView, DeleteView, View
from django.views.generic.edit import DeletionMixin

from . import app_settings
from . import forms
from . import utils

from .mixins import SessionMixin


LoginRequiredMixin = utils.import_from_path(
    app_settings.LOGIN_REQUIRED_MIXIN_CLASS)


# -----------------------------------------------------------------------------
# Sessions
# -----------------------------------------------------------------------------

class SessionListView(LoginRequiredMixin, SessionMixin, ListView):
    pass


class SessionDeleteView(LoginRequiredMixin, SessionMixin, DeleteView):
    def get_success_url(self):
        return str(reverse_lazy('safety:session_list'))


class SessionDeleteOtherView(LoginRequiredMixin, SessionMixin, DeletionMixin, View):