use urljoin from
@@ -2,13 +2,13 @@ import json
import os
import shutil
from collections import OrderedDict
+from urllib.parse import urljoin
from django.conf import settings
from django.contrib.auth import get_user_model
from django.contrib.sites.models import Site
from django.db import models
from django.utils.functional import cached_property
-from django.utils.six.moves.urllib.parse import urljoin
from django.utils.translation import ugettext_lazy as _
from jsonfield.fields import JSONField
