Support for versions 1.2 and 1.3 of the Django packaged libraries will be removed on July 18, 2016. We recommend that you move to newer versions of Django, such as Django 1.8 LTS or later.
After this date, your app will experience runtime errors if your
contains the following library entries:
libraries: -name: django version: 1.2
libraries: -name: django version: 1.3
Django provides information about key migration issues when migrating from version 1.2 to version 1.3, and when migrating from version 1.3 to version 1.4 and when migrating from version 1.4 to 1.8 in their release notes.
Use new Django versions with App Engine
For more information about using Django with App Engine, see Get started with Django