pip install python-decouple DEBUG=True SECRET_KEY=your_secret_key DATABASE_URL=postgresql://username:password@localhost:5432/dbname python from decouple import config DEBUG = config('DEBUG', default=False, cast=bool) SECRET_KEY = config('SECRET_KEY') DATABASE_URL = config('DATABASE_URL') python from decouple import config DEBUG = config('DEBUG', default=False, cast=bool, config_file='.env.dev') SECRET_KEY = config('SECRET_KEY', config_file='.env.dev') DATABASE_URL = config('DATABASE_URL', config_file='.env.dev')