__init__.py

import os

def import_all_from(module_name, globals_):
    # Calling it with the globals_ module provides a hook into the
    # module-level globals; otherwise we'd get the function's globals
    # (which might be different).
    module_split = module_name.split('.')
    module = __import__(module_name, module_name.split('.')[:-1])
    for attr in dir(module):
        if not (attr.startswith('__') and attr.endswith('__')):
            globals_[attr] = getattr(module, attr)

SETTINGS_MODE = os.environ.get('DJANGO_SETTINGS_MODE', None)

import_all_from(__name__ + '.common', globals())
if SETTINGS_MODE:
    import_all_from(__name__ + '.' + SETTING_MODE.lower(), globals())