How solve"no python application found check your startup logs" error for Django + uWSGI + nginx stack

Question

I user Django 1.10 with uWSGI and nginx on ubuntu 16.04 and deploy my app with ansible. My project have not default structure, but quite common ( thank Two scoopce for this :). I use split dev and production settings and config folder instead 'name' project folder. It's looks like this:

|-- config
|   |-- __init__.py
|   |-- settings
|   |   |-- __init__.py
|   |   |-- base.py
|   |   `-- dev.py
|   |-- urls.py
|   |-- wsgi_dev.py
|   `-- wsgi_production.py
|-- manage.py
`-- requirements.txt

My production.py genarate from ansible with security encrypt and locate in config/settings.

With this config i get "no python application found check your startup logs". Uwsgi don't see my application.

( {{ }} it's jinja2 syntax for ansible )

/etc/uwsgi/sites/{{ project_name }}

[uwsgi]
chdir = {{ django_root }}
home = /home/{{ project_user }}/venvs/{{ project_name }}
module = config.wsgi_production:application

master = true
processes = 5

socket = /run/uwsgi/{{ project_name }}.sock
chown-socket = {{ project_user }}:www-data
chmod-socket = 660
vacuum = true

Answer 1

After several weeks i can find problem in my wsgi.py. It common solution use os.environ['ENV'] for DJANGO_SETTINGS_MODULE, but with deffrent users and permissions its dosen't work.

If you use in your wsgi.py file something like this:

os.environ["DJANGO_SETTINGS_MODULE"] = "config.settings." + os.environ["ENV"]

And have problem with no python application found - split your wsgi file. I can catch that os.environ["ENV"] return empty string. I add it for my all user, use source and etc. But uwsgi in emperior mode don't see it. You sould use wsgi_dev.py and wsgi_production.py where you can write somethink like this os.environ["DJANGO_SETTINGS_MODULE"] = "config.settings.production". It's not so elegant but solve this problems fine.

For use splitting wsgi you can write something like this in wsgi.py

import os

from django.core.wsgi import get_wsgi_application

if os.environ.get('DEV') is True:
   os.environ.setdefault("DJANGO_SETTINGS_MODULE", "config.settings.dev")
else:
   os.environ.setdefault("DJANGO_SETTINGS_MODULE", 
   "config.settings.production")

application = get_wsgi_application()