http://chriskief.com/2012/12/14/django-settings-disqus-style/

settings.py

HOST_IP_ADDRESS = socket.gethostbyname(socket.gethostname())
HOST_NAME = socket.gethostname()

if string.find(HOST_NAME, '.local') is not -1:
    DJANGO_CONF = 'dev'
elif HOST_IP_ADDRESS is '123.123.123.123':
    DJANGO_CONF = 'staging'
else:
    DJANGO_CONF = 'prod'

# import from the selected environment (i.e. environments.dev)
module = __import__('environments.' + DJANGO_CONF, globals(), locals(), ['*'])
for k in dir(module):
    locals()[k] = getattr(module, k)