modify middleware settings and url paths for django 2.0 (GoogleCloudPlatform#1503)

* modify middleware settings

* Modify Python version to adjust with Django version

* use python3.6

* modify the comment of virtualenv

* modify the comment of virtualenv

* modify python version for virtualenv

* modify url path

* modify importing of mysite/urls.py

Author: hirokts

container_engine/django_tutorial/Dockerfile

@@ -20,12 +20,12 @@
 FROM gcr.io/google_appengine/python
 
 # Create a virtualenv for the application dependencies.
-# # If you want to use Python 3, add the -p python3.4 flag.
-RUN virtualenv /env
+# # If you want to use Python 2, use the -p python2.7 flag.
+RUN virtualenv -p python3 /env
 ENV PATH /env/bin:$PATH
 
 ADD requirements.txt /app/requirements.txt
-RUN /env/bin/pip install -r /app/requirements.txt
+RUN /env/bin/pip install --upgrade pip && /env/bin/pip install -r /app/requirements.txt
 ADD . /app
 
 CMD gunicorn -b :$PORT mysite.wsgi

container_engine/django_tutorial/mysite/settings.py

@@ -43,15 +43,14 @@
     'polls'
 )
 
-MIDDLEWARE_CLASSES = (
+MIDDLEWARE = (
+    'django.middleware.security.SecurityMiddleware',
     'django.contrib.sessions.middleware.SessionMiddleware',
     'django.middleware.common.CommonMiddleware',
     'django.middleware.csrf.CsrfViewMiddleware',
     'django.contrib.auth.middleware.AuthenticationMiddleware',
-    'django.contrib.auth.middleware.SessionAuthenticationMiddleware',
     'django.contrib.messages.middleware.MessageMiddleware',
     'django.middleware.clickjacking.XFrameOptionsMiddleware',
-    'django.middleware.security.SecurityMiddleware',
 )
 
 ROOT_URLCONF = 'mysite.urls'

container_engine/django_tutorial/mysite/urls.py

@@ -13,13 +13,14 @@
 # limitations under the License.
 
 from django.conf import settings
-from django.conf.urls import include, url
 from django.contrib import admin
 from django.contrib.staticfiles.urls import staticfiles_urlpatterns
+from django.urls import include, path
+
 
 urlpatterns = [
-    url(r'^', include('polls.urls')),
-    url(r'^admin/', admin.site.urls)
+    path('admin/', admin.site.urls),
+    path('', include('polls.urls')),
 ]
 
 # Only serve static files from Django during development

container_engine/django_tutorial/polls/urls.py

@@ -12,10 +12,10 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from django.conf.urls import url
+from django.urls import path
 
 from . import views
 
 urlpatterns = [
-    url(r'^$', views.index, name='index')
+    path('', views.index, name='index')
 ]