Merge pull request #39 from cartologic/upgradePy3

Upgarde to Python 3 & Django 2.2 (GeoNode 3)

context_processors.py

@@ -1,8 +1,3 @@
-# -*- coding: utf-8 -*-
-from __future__ import (absolute_import, division, print_function,
-                        unicode_literals)
-
-from builtins import *
 from django.conf import settings
 from future import standard_library
 

templatetags/basic_viewer.py

@@ -1,5 +1,5 @@
 from django import template
-from django.core.urlresolvers import reverse
+from django.urls import reverse
 import json
 register = template.Library()
 

views.py

@@ -1,7 +1,7 @@
 import base64
 import json
 
-from django.conf.urls import url
+from django.urls import path
 from django.core.exceptions import ObjectDoesNotExist, PermissionDenied
 from django.http import JsonResponse
 from django.utils.decorators import method_decorator
@@ -191,13 +191,13 @@ def map_thumbnail(self, request, mapid):
     def get_url_patterns(self):
         urls = super(BasicViewer, self).get_url_patterns()
         urls += [
-            url(r'^(?P<layername>[^/]*)/view/$',
+            path('<str:layername>/view/',
                 self.layer_view,
                 name='%s.layer.view' % self.app_name),
-            url(r'^(?P<mapid>\d+)/thumbnail$',
+            path('<int:mapid>/thumbnail/',
                 self.map_thumbnail,
                 name='%s_map_thumbnail' % self.app_name),
-            url(r'^legends$',
+            path('legends',
                 self.get_layers_legend,
                 name='%s_layers_legend' % self.app_name),
         ]