Django relative directories in settings.py

settings.py

# coding=utf-8
# Django 1.4.1 settings for <project-name> project.
import os

PROJECT_DIR = os.path.abspath(os.path.join(os.path.dirname( __file__ ), '..'))

DATABASE = os.path.join(PROJECT_DIR, 'db', 'db.sqlite3')

DATABASES = {
    'default': {
		...
        'NAME': DATABASE,
        ...
    }
}

MEDIA_ROOT = os.path.join(PROJECT_DIR, 'assets')

TEMPLATE_DIRS = (
    os.path.join(PROJECT_DIR, 'templates'),
    )