installed_apps_settings.py

DJANGO_APPS = (
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
)

THIRD_PARTY_APPS = (
    'some.third.party.app',
    'some.other.third.party.app',
    ...,
)

PROJECT_APPS = (
    'project_app_1',
    'project_app_2',
    ...,
)

INSTALLED_APPS = DJANGO_APPS + THIRD_PARTY_APPS + PROJECT_APPS