Set Relative Path of Django SQLite Database

gistfile1.py

SITE_ROOT = os.path.dirname(os.path.realpath(__file__))

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.sqlite3',
        'NAME': os.path.join(SITE_ROOT, 'db', 'test.db'),
        'USER': '',
        'PASSWORD': '',
        'HOST': '',
        'PORT': '',
    }   
}