new_contents: import os
  
  class Config(object):
      DEBUG = False
      TESTING = False
      CSRF_ENABLED = True
      SECRET_KEY = 'this-really-needs-to-be-changed'
  
  
  class ProductionConfig(Config):
      DEBUG = False
      SECRET_KEY = os.environ.get('SECRET_KEY')
  
  
  class StagingConfig(Config):
      DEVELOPMENT = True
      DEBUG = True
  
  
  class DevelopmentConfig(Config):
      DEVELOPMENT = True
      DEBUG = True
  
  
  class TestingConfig(Config):
      TESTING = True
subject: Add actual config file