Django manage.py for split settings.

manage.py

#!/usr/bin/env python
import os
import sys

from django.core.management import execute_manager

PRODUCTION = 'production'
DEVELOPMENT = 'development'

ENVIRONMENTS = [
    DEVELOPMENT,
    PRODUCTION,
]

SETTINGS = 'SETTINGS'

try:
    config = os.environ[SETTINGS].lower()
except KeyError:
    print "*** Please provide the %s environment variable! ***\n" % SETTINGS
    sys.exit(1)

if config not in ENVIRONMENTS:
    print "*** Please provide a valid environment for %s! ***" % SETTINGS
    print "Valid environments are: %s\n" % ", ".join(ENVIRONMENTS)
    sys.exit(1)

try:
    _settings = __import__('settings', globals(), locals(), ENVIRONMENTS, -1)
    if config == PRODUCTION:
        settings = _settings.production
    if config == DEVELOPMENT:
        settings = _settings.development
except ImportError:
    print "*** Invalid configuration! ***\n"
    sys.exit(1)

sys.path.insert(0, os.path.abspath(os.path.pardir))

if __name__ == "__main__":
    execute_manager(settings)