text: import os
  basedir = os.path.abspath(os.path.dirname(__file__))
  
  class Config(object):
      DEBUG = False
      TESTING = False
      CSRF_ENABLED = True
      SECRET_KEY = 'aptx4869'
      SQLALCHEMY_DATABASE_URI = os.environ['DATABASE_URL']
  
  class ProductionConfig(Config):
      DEBUG = False
  
  
  class StagingConfig(Config):
      DEVELOPMENT = True
      DEBUG = True
  
  
  class DevelopmentConfig(Config):
      DEVELOPMENT = True
      DEBUG = True
  
  
  class TestingConfig(Config):
      TESTING = True
  