Django: Strange import error

I'm deploying a (proprietary) Django application (with bad support ;-)). The only thing I need to do is setup a new Django project and implement the app's urls. So my url config is as follows:

  1 from django.conf.urls.defaults import patterns, include, url
  2 
  3 urlpatterns = patterns('',
  4     url(r'^', include('ap01.urls')),
  5 )

The application in question is also added to my INSTALLED_APPS setting.

I can validate (./manage.py validate) and all is good. When running the app I get the following import error:

ImportError at /
No module named ap01.urls

The module is present in the Python Path reported by Django and when manually importing the urls module everything works, ie:

开发者_高级运维./manage.py shell 
__import__('ap01.urls')

I compared setups with the QA and dev servers and everything seems be in place correctly. The only thing that differs is the Python version (2.6 on QA and dev; 2.7 on this new machine).

I would debug this like this:

You need to know where the ImportError gets raised. Then add something like this:

import sys
raise Exception(sys.path)

• Is the directory above "ap01" in sys.path?
• Does the directory ap01 contain a __init__.py file?
• What user-id has you python interpreter (the one which raises the import exception)? Try: import os, sys; assert False, (os.getuid(), sys.path)
• Maybe this user-id has not enough permission to read the file? Get this user with "su" (if you use a unix like OS) and then try to read it: less ...../ap01/...py