pip install python-decouple KEY=VALUE API_KEY=your-api-key python from decouple import config python api_key = config('API_KEY') python debug_mode = config('DEBUG_MODE', cast=bool) python port = config('PORT', cast=int) python allowed_ips = config('ALLOWED_IPS', cast=lambda v: [s.strip() for s in v.split(',')]) python database_url = config('DATABASE_URL', default='localhost') python from decouple import config, Csv config = config() config.COMMENT_MARK = '#'