UPD: small steps to become python3 compatible.

dav_base/tests/generic.py

@@ -1,6 +1,5 @@
 import datetime
 import os
-import urllib
 from django.apps import apps
 from django.contrib.auth.models import AbstractUser
 from django.contrib.staticfiles.testing import StaticLiveServerTestCase
@@ -9,6 +8,7 @@ from django.urls import reverse
 from selenium import webdriver
 from selenium.webdriver.support.ui import WebDriverWait
 from selenium.webdriver.support import expected_conditions as EC
+from six.moves.urllib.parse import quote
 
 
 class AppSetting(object):
@@ -252,7 +252,7 @@ class ScreenshotTestCase(SeleniumTestCase):
         self.screenshot_sequences = {}
 
     def sanitize_filename(self, location):
-        return urllib.quote(location).replace('/', '--')
+        return quote(location).replace('/', '--')
 
     def save_screenshot(self, title=None, sequence=None, resize=True):
         if sequence is None: