Path to django on google app engine - google-app-engine

Question

I completely don't understand this error. I use django-nonrel, upload it to my application by manage.py. And sometimes I have this:
<type 'exceptions.AttributeError'>: 'Settings' object has no attribute 'DATABASE_ROUTERS'
Traceback (most recent call last):
File "/base/data/home/apps/appid/3.347077242893060339/execute.py", line 2, in <module>
from djapp import queue_controller
File "/base/data/home/apps/appid/3.347077242893060339/djapp/queue_controller.py", line 5, in <module>
from djapp.models import Operation
File "/base/data/home/apps/appid/3.347077242893060339/djapp/models.py", line 3, in <module>
from django.db import models
File "/base/data/home/apps/appid/3.347077242893060339/django/db/__init__.py", line 66, in <module>
router = ConnectionRouter(settings.DATABASE_ROUTERS)
File "/base/python_runtime/python_lib/versions/third_party/django-0.96/django/conf/__init__.py", line 32, in __getattr__
return getattr(self._target, name)
or
<type 'exceptions.ImportError'>: No module named files.uploadhandler
Traceback (most recent call last):
File "/base/data/home/apps/appid/3.347067228745038183/djangoappengine/main/main.py", line 28, in <module>
from django.core.handlers.wsgi import WSGIHandler
File "/base/python_runtime/python_lib/versions/third_party/django-0.96/django/core/handlers/wsgi.py", line 1, in <module>
from django.core.handlers.base import BaseHandler
File "/base/python_runtime/python_lib/versions/third_party/django-0.96/django/core/handlers/base.py", line 3, in <module>
from django import http
File "/base/data/home/apps/appid/3.347067228745038183/django/http/__init__.py", line 28, in <module>
from django.http.multipartparser import MultiPartParser
File "/base/data/home/apps/appid/3.347067228745038183/django/http/multipartparser.py", line 14, in <module>
from django.core.files.uploadhandler import StopUpload, SkipFile, StopFutureHandlers
What is wrong with the path? Why does this happen? At first the path is "/base/data/home/apps/app-id/3.347046818251769742/django/", then it is "/base/python_runtime/python_lib/versions/third_party/django-0.96/django/".
And how to avoid this error?
I have checked sys.path, uploaded new django several times, removed all unnecessary files, I am lost :(
sys.path = ['/base/data/home/apps/appid/3.347077364008022180',
'/base/data/home/apps/appid/3.347077364008022180/djangoappengine/lib',
'/base/python_runtime/python_dist/lib/python25.zip',
'/base/python_runtime/python_dist/lib/python2.5/',
'/base/python_runtime/python_dist/lib/python2.5/plat-linux2',
'/base/python_runtime/python_dist/lib/python2.5/lib-tk',
'/base/python_runtime/python_dist/lib/python2.5/lib-dynload',
'/base/python_runtime/python_lib/versions/1',
'/base/data/home/apps/appid/3.347077364008022180/']

Answer 1

I guess that db/__init__.py does something like from django.conf import Settings, and for whatever reason, it's sometimes being given the system's version of Django rather than your own.
You could try changing it to use a relative import, like from ..conf import Settings, which should mean it uses the version in the same package as itself. That works from Python 2.5, which is what Appengine uses.