Google App Engine在缺少环境变量DJANGO_SETTINGS_MODULE时中止

这是 Google App Engine和Django支持的后续问题：

本教程适用于一个空项目，但是当我尝试将现有的Django应用程序部署到Google App Engine时，它会开始抛出错误：

The tutorial works great for an empty project, however when I try to deploy an existing Django app to Google App Engine, it starts throwing errors:

Traceback (most recent call last):
  File "/python27_runtime/python27_lib/versions/1/google/appengine/runtime/wsgi.py", line 223, in Handle
    result = handler(dict(self._environ), self._StartResponse)
  File "/python27_runtime/python27_lib/versions/third_party/django-1.4/django/core/handlers/wsgi.py", line 219, in __call__
    self.load_middleware()
  File "/python27_runtime/python27_lib/versions/third_party/django-1.4/django/core/handlers/base.py", line 39, in load_middleware
    for middleware_path in settings.MIDDLEWARE_CLASSES:
  File "/python27_runtime/python27_lib/versions/third_party/django-1.4/django/utils/functional.py", line 184, in inner
    self._setup()
  File "/python27_runtime/python27_lib/versions/third_party/django-1.4/django/conf/__init__.py", line 40, in _setup
    raise ImportError("Settings cannot be imported, because environment variable %s is undefined." % ENVIRONMENT_VARIABLE)
ImportError: Settings cannot be imported, because environment variable DJANGO_SETTINGS_MODULE is undefined.

另一个可能是相关的：

Traceback (most recent call last):
  File "/python27_runtime/python27_lib/versions/1/google/appengine/runtime/wsgi.py", line 223, in Handle
    result = handler(dict(self._environ), self._StartResponse)
  File "/python27_runtime/python27_lib/versions/third_party/django-1.4/django/core/handlers/wsgi.py", line 219, in __call__
    self.load_middleware()
  File "/python27_runtime/python27_lib/versions/third_party/django-1.4/django/core/handlers/base.py", line 39, in load_middleware
    for middleware_path in settings.MIDDLEWARE_CLASSES:
  File "/python27_runtime/python27_lib/versions/third_party/django-1.4/django/utils/functional.py", line 184, in inner
    self._setup()
  File "/python27_runtime/python27_lib/versions/third_party/django-1.4/django/conf/__init__.py", line 42, in _setup
    self._wrapped = Settings(settings_module)
  File "/python27_runtime/python27_lib/versions/third_party/django-1.4/django/conf/__init__.py", line 95, in __init__
    raise ImportError("Could not import settings '%s' (Is it on sys.path?): %s" % (self.SETTINGS_MODULE, e))
ImportError: Could not import settings 'settings' (Is it on sys.path?): No module named settings

根据本教程，我修改了我的settings.py。该应用程序部署没有问题，syncdb也工作;数据库和所有必需的表都已到位。

I have modified my settings.py as per the tutorial. The app deploys without problems and the syncdb works as well; the database and all required tables are in place.

我发现这个参考到日志中显示的错误消息，但建议的修复没有帮助。

I found this reference to the error message as shown in the log but its suggested fix did not help.

任何想法可能导致这种情况？

Any ideas what might be causing this?

编辑：

缩短这个已经很长的问题，我删除了以前发布的 wsgi.py 文件。我没有与这个问题有关。

To shorten this already lengthy question I removed the previously posted wsgi.py file. I had nothing to do with this issue.

编辑2：

认为我做了一个小的改进，GAE正在抱怨：

I think I made a small improvement and GAE is now complaining:

ImportError: No module named properties

我认为我的app.yaml文件中可能有一个条目丢失，但是我不知道哪个文件可能是。我发现一些关于缺少模块的参考，但没有一个反映这个错误消息的参考...

I presume there might be an entry missing in my app.yaml file but I have no clue as to which file that may be. I found some references regarding missing modules but none that reflect this error message...