I\'ve 2 separate settings files for production and development and a common base.py settings file
base.py
SECRET_KEY = r\"!@#$%^&12345
I think you are trying this locally, and don't have the SECRET_KEY
setup in your environment.
Set it using
export SECRET_KEY="somesecretvalue"
and then running python manage.py shell --settings=entri.settings.prod
should work fine.
I use os.getenv('SECRET_KEY'), instead of os.environ['SECRET_KEY']
print os.getenv('SECRET_KEY') #returns None if KEY doesn't exist
print os.getenv('SECRET_KEY', 0) #will return 0 if KEY doesn't exist
my python version is 2.7.12