How to use the safety.utils function in safety

def create_session(self, request, user):
        ip = utils.resolve(app_settings.IP_RESOLVER, request)
        device = utils.resolve(app_settings.DEVICE_RESOLVER, request)
        location = utils.resolve(app_settings.LOCATION_RESOLVER, request)

        user_agent = request.META.get('HTTP_USER_AGENT', '')
        user_agent = user_agent[:200] if user_agent else user_agent

        try:
            with transaction.atomic():
                obj = self.create(
                    user=user,
                    session_key=request.session.session_key,
                    ip=ip,
                    user_agent=user_agent,
                    device=device,
                    location=location,
                    expiration_date=request.session.get_expiry_date(),
                    last_activity=now())

from django.contrib.auth.tokens import default_token_generator
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'))