text: import os
  from os import environ
  
  CSRF_ENABLED = environ.get('CSRF_ENABLED', 'True')
  CSRF_SESSION_KEY = environ.get('CSRF_SESSION_KEY', os.urandom(32))
  SQLALCHEMY_TRACK_MODIFICATIONS = environ.get('SQLALCHEMY_TRACK_MODIFICATIONS', 'False')
  
  DB_DRIVER = environ.get('DB_DRIVER', 'mysql+pymysql')
  DB_USER = environ.get('DB_USER', 'root')
  DB_PASSWORD = environ.get('DB_PASSWORD', '')
  DB_HOST = environ.get('DB_HOST', 'localhost')
  DB_PORT = environ.get('DB_PORT', 3306)
  DB_NAME = environ.get('DB_NAME', 'flask')
  DB_CHARSET = environ.get('DB_CHARSET', 'utf8mb4')
  