settings.py

from decouple import Csv
from decouple import config
from django.urls import reverse_lazy
from dj_database_url import parse as dburl

SECRET_KEY = config('SECRET_KEY')
DEBUG = config('DEBUG', default=False, cast=bool)
ALLOWED_HOSTS = config('ALLOWED_HOSTS', default=[], cast=Csv())

default_dburl = 'sqlite:///' + os.path.join(BASE_DIR, 'db.sqlite3')

DATABASES = {
    'default': config('DATABASE_URL', default=default_dburl, cast=dburl),
}

STATIC_ROOT = os.path.join(BASE_DIR, 'staticfiles')